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rp505k series 1a step-down dc/dc converters with synchronous rectifier no.ea-273-110519 1 outline the rp505k series are low supply current cmos-based 1a ? step-down dc/dc converte rs with synchronous rectifier.each of these ics consists of an oscillator, a reference voltage unit, an error amplifier, a switching control circuit, a mode control circuit, a soft-start circuit, a la tch type protection circuit, an under voltage lock out (uvlo) circuit, a thermal shutdown circuit, and a switching transisto rs. a low ripple, high efficiency synchronous rectifier step-down dc/dc converter can be eas ily composed of this ic with only an inductor and capacitors. since the package is dfn(plp)2020-8, high density mounting on boards is possible. in the rp505k series, as for the a version and b version, since feedback resistors are built-in, the voltage is fixed internally. 0.1v step output can be set by laser-trim and 1.5%(v out 1.2v) or 18mv(v out <1.2v) tolerance is guaranteed. as for the c version, output voltage is adjustable with external divider resisters. mode alternative circuit works automat ically for improving the efficiency . considering fixed noise frequency, pwm fixed control type is also available. in other word s, one mode is the pwm/vfm alternative mode, the other is forced pwm fixed mode. as protection circuits, the rp505k series contain a current limit circuit which limits the lx peak current in each clock cycle, and a latch type protection circuit which latche s the built-in driver to the off state if the load current exceeds the limit value or the output short continues for a specified time (the protection delay time). the latch protective circuit can be released by once putting the ic into the standby mode with the ce pin and then into the active mode, or, by turning the power off and back on. setting the supply voltage lower than the uvlo detector threshold can also release the latch protective circ uit. the rp505k series also contain a thermal shutdown circuit which detects the overheating and resets the ic when the junction temperature of the rp505k series exceeds the specified temperature. ? )this is an approximate value, because output cu rrent depends on conditions and external parts. features ? supply curre nt ...................................................... typ. 40 a(at vfm mode, at no load) ? standby curr ent .................................................... max. 5 a ? input voltage rang e ............................................. 2.3v to 5.5v (absolute maximum rating; 6.5v) ? output voltage range(ve r.a,b) ............................ 0.6v to 3.3v (with a 0.1v step, as for 0.8v or less, input voltage range is limited. ) (ver.c) ............................... 0.8v to 3.3v ? output voltage accuracy(ver.a,b) ........................ 1.5% (v out 1.2v), 18mv (v out <1.2v) ? feedback voltage accuracy(ver.c) ...................... 9mv(v fb =0.6v) ? temperature-drift coefficien t of output voltage/feedback .............................................................................. typ. 100ppm/ c ? oscillator frequen cy ............................................. typ. 2.25mhz ? oscillator maximum du ty cycle ............................ min. 100% ? built-in driver on resi stance ............................... typ. pch. 0.23 ? nch. 0.20 ? (v in =3.6v) ? uvlo detector thre shold..................................... typ. 2.0v ? soft-start time....................................................... typ. 0.15ms ? l x current limit circ uit.......................................... typ. 1.7a ? latch type protection circuit ................................ typ. 1.5ms ? package ................................................................ df n(plp)2020-8
rp505 k 2 applications ? power source for portable equipment such as cellular, pda, dsc, notebook pc ? power source for hdd, wlan. ? power source for li-ion battery-used equipment block diagrams rp505kxx1a ce pv in agnd l x chip enable ramp com p ensation current feedback current detector switching control uvlo osc vref v out mode control soft start pgn d mode thermal protection av in
rp505 k 3 rp505kxx1b ce pv in agnd l x chip enable ramp com p ensation current feedback current detector switching control uvlo osc vref v out mode control soft start pgn d mode thermal protection av in rp505k001c ce pv in agnd l x chip enable ramp com p ensation current feedback current detecto r switching control uvlo osc vref v fb mode control soft start pgn d mode thermal protection av in
rp505 k 4 selection guide in the rp505k series, output voltage, and auto discharge function for the ic are selectable at the user?s request. product name package quantity per reel pb free halogen free rp505kxx1$-tr dfn(plp)2020-8 5,000pcs yes yes xx : $ : the output voltage can be designated in the range fr om 0.6v(06) to 3.3v(33) in 0.1v steps. designation is possible in the range from 0.6v *1 to 3.3v with a step of 0.1v ? 2 xx=00: output voltage adjustable type. (refer to the marking information) designation of mask option a) fixed output voltage type, without aut o-discharge function at off state b) fixed output voltage type, with auto-discharge function at off state c) adjustable output voltage type, without auto-discharge function at off state auto-discharge function quickly lowers the output voltage to 0v , when the chip enable signal is switched from the active mode to the standby mode, by releasing the electric al charge accumulated in the external capacitor. ? 1) less than 0.8v output settings are under development. ? 2) 0.05v step is also available as a custom code. pin configurations ? dfn(plp)2020-8 top view bottom view 5 6 7 8 4 3 2 1 8 7 6 5 1 2 3 4 ?
rp505 k 5 pin descriptions ? rp505k:dfn(plp)2020-8 pin no. symbol description 1 mode mode control pin 2 ce chip enable pin ("h" active) 3 av in input pin 4 pv in input pin 5 l x l x switching pin 6 agnd ground pin 7 pgnd ground pin 8 v out /v fb output pin / feedback pin ? ) tab is gnd level. (they are connect ed to the reverse side of this ic.) the tab is better to be connected to the g nd, but leaving it open is also acceptable. absolute maximum ratings (agnd=pgnd=0v) symbol item rating unit a/pv in av in /pv in input voltage -0.3 to 6.5 v v lx l x pin voltage -0.3 to a/pv in + 0.3 v v ce ce pin input voltage -0.3 to 6.5 v v out /v fb v out /v fb pin voltage -0.3 to 6.5 v i lx l x pin output current 1.7 a p d power dissipation (dfn(plp)2020-8) ? 880 mw t a operating temperature range -40 to 85 c t stg storage temperature range -55 to 125 c ? ) for power dissipation, please refer to package information. absolute maximum ratings electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safe ty for both device and sy stem using the device in the field. the functional operation at or over these absolute maximum ratings is not assured. recommended operating conditions (electrical characteristics) all of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. the semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. and the semiconductor de vices may receive serious damage when they continue to operate over the recommended operating conditions.
rp505 k 6 electrical characteristics ? rp505kxx1a/b (ta=25 c) symbol item conditions min. typ. max. unit a/pv in operating input voltage 2.3 5.5 v v out 1.2v -1.5% +1.5% v out output voltage a/pv in =v ce =3.6v or v set +1v v out <1.2v -0.018 +0.018 v v out / t output voltage temperature coefficient -40 c < = < = c 100 ppm/ c f osc oscillator frequency a/pv in =v ce =3.6v or v set +1v 2.00 2.25 2.50 mhz i dd1 supply current 1 a/pv in =v ce =5.5v, v out =v set 0.8 500 840 a v mode =0v 40 60 i dd2 supply current 2 a/pv in =v ce = v out = 5.5v v mode =5.5v 500 840 a i standby standby current a/pv in =5.5v,v ce =0v 0 5 a i ceh ce "h" input voltage a/pv in =v ce =5.5v -1 0 1 a i cel ce "l" input voltage a/pv in =5.5v,v ce =0v -1 0 1 a i modeh mode "h" input current a/pv in =v mode =5.5v,v ce =0v -1 0 1 a i model mode "l" input current a/pv in =5.5v,v ce =v mode =0v -1 0 1 a i vouth v out "h" input current ? 1 a/pv in =v out =5.5v,v ce =0v -1 0 1 a i voutl v out "l" input current a/pv in =5.5v,v ce =v out =0v -1 0 1 a r low nch on resistance for auto discharge ? 2 a/pv in =3.6v,v ce =0v 30 ? i lxleakh l x leakage current "h" a/pv in =v lx =5.5v,v ce =0v -1 0 5 a i lxleakl l x leakage current "l" a/pv in =5.5v,v ce =v lx =0v -5 0 1 a v ceh ce "h" input voltage a/pv in =5.5v 1.0 v v cel ce "l" input voltage a/pv in =2.3v 0.4 v v modeh mode ?h? input voltage a/pv in =v ce =5.5v 1.0 v v model mode ?l? input voltage a/pv in =v ce =2.3v 0.4 v r onp on resistance of pch tr. a/pv in =3.6v, i lx = ? 100ma 0.23 ? r onn on resistance of nch tr. a/pv in =3.6v, i lx = ? 100ma 0.20 ? maxduty oscillator maximum duty cycle 100 % t start soft-start time a/pv in =v ce =3.6v or v set +1v 150 300 s i lx lim lx current limit a/pv in =v ce =3.6v or v set +1v 1400 1700 ma t prot protection delay time a/pv in =v ce =3.6v or v set +1v 0.5 1.5 5 ms v uvlo1 uvlo detector threshold a/pv in =v ce 1.9 2.0 2.1 v v uvlo2 uvlo released voltage a/pv in =v ce 2.0 2.1 2.2 v t tsd thermal shutdown detector temperature junction temperature 140 c t tsr thermal shutdown release temperature junction temperature 100 c test circuit is "open loop" and agnd=pgnd=0v unless otherwise specified. ? 1) without auto discharge version only ? 2) with auto discharge version only
rp505 k 7 ? rp505k001c (ta=25 c) symbol item conditions min. typ. max. unit a/pv in operating input voltage 2.3 5.5 v v fb feedback output voltage a/pv in =v ce =3.6v 0.591 0.600 0.609 v v fb / t feedback output voltage temperature coefficient -40 c < = < = c 100 ppm/ c f osc oscillator frequency a/pv in =v ce =3.6v or v set +1v 2.00 2.25 2.50 mhz i dd1 supply current 1 a/pv in =v ce =5.5v, v fb =0.48v 500 840 a v mode =0v 40 60 i dd2 supply current 2 a/pv in =v ce = v out = 5.5v v mode =5.5v 500 840 a i standby standby current a/pv in =5.5v,v ce =0v 0 5 a i ceh ce "h" input voltage a/pv in =v ce =5.5v -1 0 1 a i cel ce "l" input voltage a/pv in =5.5v,v ce =0v -1 0 1 a i modeh mode "h" input current a/pv in =v mode =5.5v,v ce =0v -1 0 1 a i model mode "l" input current a/pv in =5.5v,v ce =v mode =0v -1 0 1 a i vfbh v fb "h" input current a/pv in =v out =5.5v,v ce =0v -1 0 1 a i vfbl v fb "l" input current a/pv in =5.5v,v ce =v out =0v -1 0 1 a i lxleakh l x leakage current "h" a/pv in =v lx =5.5v,v ce =0v -1 0 5 a i lxleakl l x leakage current "l" a/pv in =5.5v,v ce =v lx =0v -5 0 1 a v ceh ce "h" input voltage a/pv in =5.5v 1.0 v v cel ce "l" input voltage a/pv in =2.3v 0.4 v v modeh mode ?h? input voltage a/pv in =v ce =5.5v 1.0 v v model mode ?l? input voltage a/pv in =v ce =2.3v 0.4 v r onp on resistance of pch tr. a/pv in =3.6v, i lx = ? 100ma 0.23 ? r onn on resistance of nch tr. a/pv in =3.6v, i lx = ? 100ma 0.20 ? maxduty oscillator maximum duty cycle 100 % t start soft-start time a/pv in =v ce =3.6v or v set +1v 150 300 s i lx lim l x current limit a/pv in =v ce =3.6v or v set +1v 1400 1700 ma t prot protection delay time a/pv in =v ce =3.6v or v set +1v 0.5 1.5 5 ms v uvlo1 uvlo detector threshold a/pv in =v ce 1.9 2.0 2.1 v v uvlo2 uvlo released voltage a/pv in =v ce 2.0 2.1 2.2 v t tsd thermal shutdown detector temperature junction temperature 140 c t tsr thermal shutdown release temperature junction temperature 100 c test circuit is "open loop" and agnd=pgnd=0v unless otherwise specified.
rp505 k 8 typical application (fixed output voltage type) pv in ce l x v out pgnd agnd v in c in 4.7 f c out 10 f v out l 2.2 h rp505k series a v in mode ? ) mode=?h? forced pwm mode=?l? pwm/vfm automatic shift (adjustable output voltage type) pv in ce l x v fb pgnd agnd v in c in 4.7 f c out 10 f v out l 2.2 h rp505k series a v in mode r 1 r 2 c 1 ? ) mode=?h? forced pwm mode=?l?pwm/vfm automatic shift symbol recommendation components c in 4.7 f ceramic c1608jb0j475k(tdk) c out 10 f ceramic c1608jb0j106m(tdk) l 2.2 h inductor mipsa2520d2r2(fdk)
rp505 k 9 technical notes when you use these ics, consider the following issues: ? set the same level as agnd and pgnd. ? set the same level as av in and pv in . ? place the external parts as close as possible to the ic by using a short as possible wiring. especially, place the capacitor as close as possible to the v in and pgnd pins. ensure the v dd and gnd lines are sufficiently robust. if their impedances are too high, the electrical potential of the inside of the ic could be fluctuated by switching current, and noise pickup or unstable operation could be t he results. please note that the large switching current flows through the v dd line, the gnd line, an inductor, the l x , and the v out line. separate the line between the v out pin and an inductor (a and b versions), and t he line between a resistor for setting output voltage (r1) and an inductor (c version), from the line c onnected to the load. use a ce ramic capacitor with the small esr value. ? the recommended capacitance value for the c in capacitor connected between the v in and pgnd pins is 4.7f or more. also, the recommended capacitance value for the c out capacitor is 10f. ? the inductance value should be set within the rage of 1.0 to 2.2h. however, the indu ctance value is limited by output voltage, so please refer to the table below . for stable operation, the phase compensation is set according to the specified indu ctance value and the specified c out capacitance value. select the inductor with low dc resistance, with large permissive current, with high resistant to magnetic saturation. select the inductance value considering the load cu rrent by the conditions of use. if the inductance value is small, the l x peak current may increase along with the increase of load current. when the l x peak current reaches to the ?l x limit current?, the current limit circuit may be activated. inductance range vs. output voltage range v out [v] l=1.0 h l=1.5 h l=2.2 h 0.6~1.55 1.6~2.3 2.35~3.3 ? please note that current limit circuit and latch type prot ection circuit could be affected by self-heating or heat dissipation environment. ? for adjustable output voltage type (c version), the output voltage (v out ) is adjustable by changing the r 1 and r 2 values as follows. v out = v fb (r 1 + r 2 ) / r 2 (0.8v < = < = ? or less. if the operation becomes unstable due to the high impedance, the impedance should be decreased. the c 1 value can be calculated by the following formula. please use the value close to the calculation result. c 1 = 4.84 10 -6 / r 2 [f] ? the performance of power supply circuits using this ic largely depends on the peripheral circuits. please be very careful when setting the peripheral parts. when designing the peripheral circuits of each part, pcb patterns, and this ic, please do not exceed the rated values (voltage, current, power).
rp505 k 10 operation of step-down dc/dc converter and output current the dc/dc converter charges e nergy in the inductor when l x transistor is on, and discharges the energy from the inductor when l x transistor is off and controls with less energy loss, so that a lower output voltage than the input voltage is obtained. the operation will be explained with reference to the following diagrams: pch tr l nch tr v in i1 v out cl i2 gnd t=1/fosc ton toff topen ilmin ilmax il i1 i2 ? step 1 : pch tr. turns on and current il (=i1) flows, and en ergy is charged into cl. at this moment, il increases from il min (=0) to reach il max in proportion to the on-time period (t on ) of pch tr. ? step 2 : when pch tr. turns off, sync hronous rectifier nch tr. turns on in order that l maintains il at il max , and current il (=i2) flows. ? step 3: il (=i2) decreases gradually and reaches il=il min =0 after a time period of t open , and nch tr. turns off. provided that in the continuous mode, next cycle starts befor e il becomes to 0 because t off time is not enough. in this case, il value increases from this il min (>0). in the case of pwm control system , the output voltage is maintained by controlling the on-time period (t on ), with the oscillator frequency (f osc ) being maintained constant. the maximum value (il max ) and the minimum value (il min ) of the current flowing through the inductor are the same as those when pch tr. turns on and off. the difference between il max and il min , which is represented by i: ? i = il max ? il min = v out t open / l = (v in ? v out ) t on / l .........................................e quation 1 wherein, t = 1 / f osc = t on + t off duty (%)= t on / t 100 = t on f osc 100 t open t off in equation 1, v out t open / l and (v in ? v out ) t on / l respectively show the change of the current at "on", and the change of the current at "off".
rp505 k 11 discontinuous mode and continuous mode when the output current (i out ) is relatively small, t open < t off as illustrated in the above diagram. in this case, the energy is charged in the inductor during the time period of t on and is discharged in its entirely during the time period of t off , therefore il min becomes to zero (il min =0). when i out is gradually increased, eventually, t open becomes to t off (t open =t off ), and when i out is further increased, il min becomes larger than zero (il min >0). the former mode is referred to as the discontinuous mode and the latter mode is referred to as continuous mode. discontinuous mode continuous mode ilmax ilmin ton toff t=1/fosc topen il t ilmax ilmin ton toff t=1/fosc il iconst t in the continuous mode, when equation 1 is solved for t on and assumed that the solution is t onc , t onc = t v out / v in ....................................................................................................... equat ion 2 when t on rp505 k 12 forced pwm mode control and vfm mode control by setting the mode pin to h, the ic switches the frequen cy at the fixed rate to reduce noise even when output load is light. therefore, when i out is ? il/2 or less, il min becomes less than 0. that is, the ic discharges the electrical charge in cl to the ic side until the il changes from il min to 0 during t on time, and the il changes from 0 to il min during t off time. forced pwm mode control ilmax ilmin ton toff t=1/fosc il i out t 0 il by setting the mode pin to l, the ic automatically switches into vfm mode for high efficiency when output load is light. under vfm mode, t on indicates the time until the ic reaches to the pre-set il max . with the rp505k series, il max during vfm control is pre-set to 280ma or so. however, even if the ic is not reached to il max yet, t on turns off when it becomes around 1.5 times of t=1/f osc . vfm mode control ilmax ilmin ton toff il t 0
rp505 k 13 output current and selecti on of external components the relation between the output current and external components is as follows: (wherein, ripple current p-p value is described as i rp , on resistance of pch tr. and nch tr. of l x are respectively described as r onp and r onn , and the dc resistor of the inductor is described as r l .) when pch tr. of l x is on: v in = v out + (r onp + r l ) i out + l i rp / t on ................................................................. equat ion 3 when pch tr. of l x is "off" (nch tr. is "on"): l i rp / t off = r onn i out + v out + r l i out ................................................................. equat ion 4 put equation 4 to equation 3 and solve for on duty of pch transistor, d on = t on / (t off + t on ), d on = (v out + r onn i out + r l i out ) / (v in + r onn i out ? r onp i out )....................... equation 5 ripple current is as follows: i rp = (v in ? v out ? r onp i out ? r l i out ) d on / f osc / l............................................. e quation 6 wherein, peak current that flows through l, and l x tr. is as follows: il x max = i out + i rp / 2 .................................................................................................... equation 7 ? consider il x max , condition of input and output and select external components. ? the above explanation is directed to the calculat ion in an ideal case in continuous mode.
rp505 k 14 timing chart (1) soft-start time ? in the case of starting this ic with ce in the case of starting this ic with ce, the operation can be as in the timing chart below. when the voltage of ce pin (v ce ) is beyond the threshold level, the oper ation of the ic starts. the threshold voltage of ce pin is in between ce "h" input voltage (v ceh ) and ce "l" input voltage (v cel ) described in the electrical characteristics table. soft-start circuit op erates, and after the certain time, the reference voltage inside the ic (v ref ) is rising gradually up to the constant value. v ceh soft-start time ic internal voltage reference v cel threshold level lx voltage (v ce ) (v ref ) soft-start circuit operating ( v lx ) depending on power supply, load current, external components (v out ) output voltage ce pin input voltage pwm mode operating during the soft-start time soft-start time is the time interval from soft-start circuit starting point to the reference voltage level reaching point up to this constant level. ? soft-start time is not always equal to the turn-on speed of dc/dc converter. the power supply capacity for this ic, load current, inductance and capacitance values affect the turn-on speed. ? in the case of starting with power supply in the case of starting with power supply, when the input voltage (v in ) is larger than uvlo released voltage (v uvlo2 ), soft-start circuit operates, and after that, the same explanation above is applied to the operation. soft-start time is the time interval from soft-start circuit starting point to the reference voltage level reaching point up to this constant level. output voltage input voltage v uvlo2 ic internal voltage reference v uvlo1 lx voltage set v out set v out soft-start time depending on power supply, load current, external components pwm mode operating during the soft-start time (v out ) (v in ) (v ref ) (v lx ) ? turn-on speed is affected by next conditions; (a) input voltage (v in ) rising speed depending on the power supplier to the ic and input capacitor c in . (b) output capacitor c out value and load current value.
rp505 k 15 (2) under voltage lockout (uvlo) circuit the step-down dc/dc converter stops and on duty becomes 100%, if input voltage (v in ) becomes less than the set output voltage (set v out ), the output voltage (v out ) gradually drops according to the input voltage (v in ). if the input voltage drops more and becomes less than uvlo detector threshold (v uvlo1 ), the under voltage lockout circuit (uvlo) operat es, the ic internal reference voltage (v ref ) stops, switching transistors turn off and the output voltage drops according to the load and output capacitor c out value. to restart the normal operation, the input voltage (v in ) must be more than the uvlo released voltage (v uvlo2 ). the timing chart below describes the operation with varying the input voltage (v in ). v uvlo2 v uvlo1 set v out set v out output voltage input voltage ic internal voltage reference lx voltage soft-start time depending on power supply, load current, external components (v out ) (v in ) (v ref ) (v lx ) ? actually, the waveform of v out at uvlo working and releasing varies depending on the initial voltage of c out and load current situation.
rp505 k 16 (3) over current protection circuit, latch type protection circuit over current protection circuit supervises the i nductor peak current (the current flowing through pch transistor) in each switching cycle, and if the current exceeds the l x current limit (i lx lim ), turns off pch transistor. the l x current limit of rp505k is typ.1700ma. latch type protection circuit latches the built-in driv er to the off state and st ops the operation of dc/dc converter if the over current status continues or t he output voltage continues being the half of the setting voltage for equal or longer than protection delay time (t prot ). ? l x current limit (i lx lim ) and protection delay time (t prot ) could be easily affected by self-heating or ambient environment. if the input voltage (v in ) drops drastically or becomes unstable due to short-circuit, the protection operation and protection delay time may be affected. protection delay time (t prot ) lx current limit (i lx lim ) lx current pch tr. current lx voltage (v lx ) to release the condition of latch type protection, restart this ic by inputting "l" signal to ce pin, or restart this ic with power-on or make the supply voltage lower than uvlo detector threshold (v uvlo1 ) level. the timing chart shown below describes the changing pr ocess of input voltage rising, stable operating, operating with large current, reset with ce pin, st able operating, input voltage falling, input voltage recovering, and stable operating. point(1) : if the large current flows through the circ uit or the ic goes into low output voltage condition due to short-circuit or other reasons, the latch type protection circuit latches the built-in driver to off state after the protection delay time (t prot ). then, v lx becomes "l" and the output voltage turns off. in this timing chart below, the latch protective circuit can be released by once putting the ic into "l" with the ce pin and then into "h" again. point(2) : the latch type protection can be released by uvlo reset by making the input voltage lower than the uvlo detector threshold(vuvlo1) input voltage (v in ) set v out uvl o detect voltage (v uvlo1 ) ce pin input voltage (v ce ) set v out threshold level lx voltage (v lx ) set v out output voltage (v out ) uvl o release voltage (v uvlo 2 ) (1) (2) sof t-s tart tim e set v out sof t-s tart tim e soft-start time stable operation protection delay time protection delay time uv lo r eset ce res et latch-type protection latch-type protecti on stable operation stable operation
rp505 k 17 typical characteristics 1) output voltage vs. output current rp505k v out =0.8v rp505k v out =0.8v mode=?l?pwm/vfm automatic shift mode=?h? forced pwm 0.780 0.785 0.790 0.795 0.800 0.805 0.810 0.815 0.820 0.01 0.1 1 10 100 1000 output current i ou t (ma) output voltage v out (v) vin=3.6v vin=5.0v 0.780 0.785 0.790 0.795 0.800 0.805 0.810 0.815 0.820 0 200 400 600 800 1000 output current i out (ma) output voltage v out (v) vin=3.6v vin=5.0v rp505k v out =1.2v rp505k v out =1.2v mode=?l?pwm/vfm automatic shift mode=?h? forced pwm 1.180 1.185 1.190 1.195 1.200 1.205 1.210 1.215 1.220 0.01 0.1 1 10 100 1000 output current i out (ma) output voltage v ou t (v) vin=3.6v vin=5.0v 1.180 1.185 1.190 1.195 1.200 1.205 1.210 1.215 1.220 0 200 400 600 800 1000 output current i out (ma) output voltage v out (v) vin=3.6v vin=5.0v rp505k v out =1.8v rp505k v out =1.8v mode=?l?pwm/vfm automatic shift mode=?h? forced pwm 1.770 1.775 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 1.820 1.825 1.830 0.01 0.1 1 10 100 1000 output current i out (ma) output voltage v ou t (v) vin=3.6v vin=5.0v 1.770 1.775 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 1.820 1.825 1.830 0 200 400 600 800 1000 output current i out (ma) output voltage v out (v) vin=3.6v vin=5.0v
rp505 k 18 rp505k v out =3.3v rp505k v out =3.3v mode=?l?pwm/vfm automatic shift mode=?h? forced pwm 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 3.350 0.01 0.1 1 10 100 1000 output current i out (ma) output voltage v out (v) vin=4.3v vin=5.0v 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 3.350 0 200 400 600 800 1000 outp ut current i out (ma) output voltage v out (v) vin=4.3v vin=5.0v 2) output voltage vs. input voltage rp505k v out =0.8v rp505k v out =1.2v mode=?h? forced pwm mode=?h? forced pwm 0.78 0.79 0.80 0.81 0.82 2.3 2.8 3.3 3.8 4.3 4.8 5.3 input voltage v in (v) output voltage v out (v) iout=1ma iout=10 0ma iout=80 0ma 1.18 1.19 1.20 1.21 1.22 2.3 2.8 3.3 3.8 4.3 4.8 5.3 input voltage v in (v) output voltage v out (v) iout=1 ma iout=100ma iout=800ma rp505k v out =1.8v rp505k v out =3.3v mode=?h? forced pwm mode=?h? forced pwm 1.77 1.78 1.79 1.80 1.81 1.82 1.83 2.3 2.8 3.3 3.8 4.3 4.8 5.3 in put voltage v in (v) output voltage v out (v) iout=1ma iout=100ma iout=800ma 3.25 3.26 3.27 3.28 3.29 3.30 3.31 3.32 3.33 3.34 3.35 3.8 4.3 4.8 5.3 input voltage v in (v) output voltage v out (v) iout=1ma iout=100ma iout=800ma
rp505 k 19 3) output voltage vs. temperature 4) feedback voltage vs. temperature rp505k181a/b rp505k001c 0.591 0.594 0.597 0.600 0.603 0.606 0.609 -50 -25 0 25 50 75 100 temperature ta (c) feedback voltage v fb (v) vin=3.6v 1.770 1.780 1.790 1.800 1.810 1.820 1.830 -50-250 255075100 temperature ta (c) output voltage v ou t (v) vin=3.6v 5) efficiency vs. output current rp505k v out =0.8v rp505k v out =1.2v 0 10 20 30 40 50 60 70 80 90 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) v in =v mode =3.6v v in =v mode =5.0v v in =5.0v, v mode =0v 0 10 20 30 40 50 60 70 80 90 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) v in =v mode =3.6v v in =v mode =5.0 v in =5.0v , v mode =0v v in =3.6v, v mode =0v v in =3.6v, v mode =0v rp505k v out =1.8v rp505k v out =3.3v 0 10 20 30 40 50 60 70 80 90 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) v in =v mode =3.6v v in =v mode =5.0v v in =5.0v, v mode =0v v in =3.6v , v mode =0v 0 10 20 30 40 50 60 70 80 90 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) v in =v mode =4.3v v in =v mod e=5.0v v in =5.0v , v mode =0v v in =4.3v, v mode =0v
rp505 k 20 6) supply current vs. temperature 7) supply current vs. input voltage rp505k v out =1.8v(v in =5.5v) rp505k v out =1.8v mode=?l?pwm/vfm automatic shift mode=?l?pwm/vfm automatic shift 25 30 35 40 45 50 55 -50 0 50 100 temperature ta (c) supply current (a) closed loop open loop 25 30 35 40 45 50 55 2.32.83.33.84.34.85.3 input voltage v in (v) supply current (a) closed loop open loop 8) dc/dc output waveform rp505k v out =0.8v(v in =3.6v) rp505k v out =0.8v(v in =3.6v) mode=?l?pwm/vfm automatic shift mode=?h? forced pwm i out =10ma 0.00 0.01 0.02 0.03 0.04 010203040 time t (s) output ripple voltage(ac) vripple (v) -100 0 100 200 300 inductor current il (ma) output voltage il i out =10ma 0.00 0.01 0.02 0.03 0.04 0 5 10 15 20 time t (s) output ripple voltage(ac) vripple (v) -100 -50 0 50 100 inductor current il (ma) output voltage il rp505k v out =1.2v(v in =3.6v) rp505k v out =1.2v(v in =3.6v) mode=?l?pwm/vfm automatic shift mode=?h? forced pwm i out =10ma 0.00 0.01 0.02 0.03 0.04 010203040 time t (s) output ripple voltage(ac) vripple (v) -100 0 100 200 300 inductor current il (ma) output voltage il i out =10ma 0.00 0.01 0.02 0.03 0.04 0 5 10 15 20 time t (s) output ripple voltage(ac) vripple (v) -100 -50 0 50 100 inductor current il (ma) output voltage il
rp505 k 21 rp505k v out =1.8v(v in =3.6v) rp505k v out =1.8v(v in =3.6v) mode=?l?pwm/vfm automatic shift mode=?h? forced pwm i out =10ma 0.00 0.01 0.02 0.03 0.04 0 10203040 time t (s) output ripple voltage(ac) vripple (v) -100 0 100 200 300 inductor current il (ma) output voltage il i out =10ma 0.00 0.01 0.02 0.03 0.04 0 5 10 15 20 time t (s) output ripple voltage(ac) vripple (v) -100 -50 0 50 100 inductor current il (ma) output voltage il rp505k v out =3.3v(v in =5.0v) rp505k v out =3.3v(v in =5.0v) mode=?l?pwm/vfm automatic shift mode=?h? forced pwm i out =10ma 0.00 0.01 0.02 0.03 0.04 010203040 time t (s) output ripple voltage(ac) vripple (v) -100 0 100 200 300 inductor current il (ma) output voltage il i out =10ma 0.00 0.01 0.02 0.03 0.04 0 5 10 15 20 time t (s) output ripple voltage(ac) vripple (v) -100 -50 0 50 100 inductor current il (ma) output voltage il
rp505 k 22 9) oscillator frequency vs. temperature 10) oscillator frequency vs. input voltage 2 2.1 2.2 2.3 2.4 2.5 2.3 2.8 3.3 3.8 4.3 4.8 5.3 input voltage v in (v) frequency fosc (mhz) 85c 25c -40c 2 2.1 2.2 2.3 2.4 2.5 -50 -25 0 25 50 75 100 temperature ta (c) frequency fosc (mhz) vin=3.6v 11) soft-start time vs. temperature 150 160 170 180 190 200 210 -50 -25 0 25 50 75 100 temperature ta (c) soft start time tstart (s) 12) uvlo detector threshold / released voltage vs. temperature uvlo detector threshold uvlo released voltage 1.9 2.0 2.1 2.2 2.3 -50 -25 0 25 50 75 100 temperature ta (c) uvlo voltage v uvlo1 (v) 1.9 2.0 2.1 2.2 2.3 -50 -25 0 25 50 75 100 temperature ta (c) uvlo voltage v uvlo2 (v)
rp505 k 23 13) ce input voltage vs. temperature ce?h? input voltage(v in =5.5v) ce?l? input voltage (v in =2.3v) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -50 -25 0 25 50 75 100 temperature ta (c) ce input voltage v ce (v) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -50 -25 0 25 50 75 100 temperature ta (c) ce input voltage v ce (v) 14) l x current limit vs. temperature 1500 1600 1700 1800 1900 2000 -50 -25 0 25 50 75 100 temperature ta (c) lx current limit ilim (ma) 15 nch tr. on resistance vs. temperature 16 pch tr. on resistance vs. temperature 0.0 0.1 0.2 0.3 0.4 -50 -25 0 25 50 75 100 temperature ta (c) nch tr. onresistance r on ( ? ) 0.0 0.1 0.2 0.3 0.4 -50 -25 0 25 50 75 100 temperature ta (c) pch tr. onresistance r on ( ? )
rp505 k 24 17) load transient response rp505k081a/b (v in =3.6v) rp505k081a/b (v in =3.6v) mode=?l?pwm/vfm automatic shift mode=?l?pwm/vfm automatic shift 0.65 0.70 0.75 0.80 0.85 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 1ma-->300ma 0.70 0.75 0.80 0.85 0.90 -100 0 100 200 300 400 500 600 700 800 900 time t (s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k081a/b (v in =3.6v) rp505k081a/b (v in =3.6v) mode=?h? forced pwm mode=?h? forced pwm 0.65 0.70 0.75 0.80 0.85 -10 0 10 20 30 40 50 60 70 80 90 time t ( s) output voltage v out (v) 0 200 400 output current i ou t (ma) output voltage output current 1ma-->300ma 0.70 0.75 0.80 0.85 0.90 -10 0 10 20 30 40 50 60 70 80 90 time t ( s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k081a/b (v in =3.6v) rp505k081a/b (v in =3.6v) 0.65 0.70 0.75 0.80 0.85 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 300ma-->800ma 0.70 0.75 0.80 0.85 0.90 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 800ma-->300ma
rp505 k 25 rp505k181a/b (v in =3.6v) rp505k181a/b (v in =3.6v) mode=?l?pwm/vfm automatic shift mode=?l?pwm/vfm automatic shift 1.65 1.70 1.75 1.80 1.85 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 1ma-->300ma 1.70 1.75 1.80 1.85 1.90 -100 0 100 200 300 400 500 600 700 800 900 time t (s ) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k181a/b (v in =3.6v) rp505k181a/b (v in =3.6v) mode=?h? forced pwm mode=?h? forced pwm 1.65 1.70 1.75 1.80 1.85 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v ou t (v) 0 200 400 output current i out (ma) output voltage output current 1ma-->300ma 1.70 1.75 1.80 1.85 1.90 -10 0 10 20 30 40 50 60 70 80 90 time t (s ) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k181a/b (v in =3.6v) rp505k181a/b (v in =3.6v) 1.65 1.70 1.75 1.80 1.85 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 300ma-->800ma 1.70 1.75 1.80 1.85 1.90 -10 0 10 20 30 40 50 60 70 80 90 time t (s ) output voltage v out (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 800ma-->300ma
rp505 k 26 rp505k331a/b (v in =5.0v) rp505k331a/b (v in =5.0v) mode=?l?pwm/vfm automatic shift mode=?l?pwm/vfm automatic shift 3.15 3.20 3.25 3.30 3.35 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v ou t (v) 0 200 400 output current i out (ma) output voltage output current 1ma-->300ma 3.20 3.25 3.30 3.35 3.40 -100 0 100 200 300 400 500 600 700 800 900 time t (s) output voltage v out (v) 0 200 400 output current i ou t (ma) output voltage output current 300ma-->1ma rp505k331a/b (v in =5.0v) rp505k331a/b (v in =5.0v) mode=?h? forced pwm mode=?h? forced pwm 3.15 3.20 3.25 3.30 3.35 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 200 400 output current i out (ma) ou tput vol t age output current 1ma-->300ma 3.20 3.25 3.30 3.35 3.40 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k331a/b (v in =5.0v) rp505k331a/b (v in =5.0v) 3.15 3.20 3.25 3.30 3.35 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 300ma-->800ma 3.20 3.25 3.30 3.35 3.40 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 800ma-->300ma
rp505 k 27 rp505k001c (v in =3.6v, v out =0.8v) rp505k001c (v in =3.6v, v out =0.8v) mode=?l?pwm/vfm automatic shift mode=?l?pwm/vfm `? 0.65 0.70 0.75 0.80 0.85 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v ou t (v) 0 200 400 output current i out (ma) ou tput volta ge output current 1ma-->300ma 0. 70 0. 75 0. 80 0. 85 0. 90 -100 0 100 200 300 400 500 600 700 800 900 time t (s) output voltage v ou t (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k001c (v in =3.6v, v out =0.8v) rp505k001c (v in =3.6v, v out =0.8v) mode=?h? forced pwm mode=?h? forced pwm 0.65 0.70 0.75 0.80 0.85 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v ou t (v) 0 200 400 output current i out (ma) output voltage output current 1ma-->300ma 0.70 0.75 0.80 0.85 0.90 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k001c (v in =3.6v, v out =0.8v) rp505k001c (v in =3.6v, v out =0.8v) 0.65 0.70 0.75 0.80 0.85 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 300ma-->800ma 0.70 0.75 0.80 0.85 0.90 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 800ma-->300ma
rp505 k 28 rp505k001c (v in =3.6v, v out =1.2v) rp505k001c (v in =3.6v, v out =1.2v) mode=?l?pwm/vfm automatic shift mode=?l?pwm/vfm automatic shift 1.05 1.10 1.15 1.20 1.25 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v ou t (v) 0 200 400 output current i out (ma) output voltage output current 1ma-->300ma 1.10 1.15 1.20 1.25 1.30 -100 0 100 200 300 400 500 600 700 800 900 time t (s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k001c (v in =3.6v, v out =1.2v) rp505k001c (v in =3.6v, v out =1.2v) mode=?h? forced pwm mode=?h? forced pwm 1.05 1.10 1.15 1.20 1.25 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v ou t (v) 0 200 400 output current i out (ma) output voltage output current 1ma-->300ma 1.10 1.15 1.20 1.25 1.30 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k001c (v in =3.6v, v out =1.2v) rp505k001c (v in =3.6v, v out =1.2v) 1.05 1.10 1.15 1.20 1.25 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v ou t (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 300ma-->800ma 1.10 1.15 1.20 1.25 1.30 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 800ma-->300ma
rp505 k 29 rp505k001c (v in =3.6v, v out =1.8v) rp505k001c (v in =3.6v, v out =1.8v) mode=?l?pwm/vfm automatic shift mode=?l?pwm/vfm automatic shift 1.65 1.70 1.75 1.80 1.85 -10 0 10 20 30 40 50 60 70 80 90 time t (s ) output voltage v ou t (v) 0 200 400 output current i out (ma) output voltage output current 1ma-->300ma 1.70 1.75 1.80 1.85 1.90 -10 0 0 100 200 300 400 500 600 700 800 900 time t ( s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k001c (v in =3.6v, v out =1.8v) rp505k001c (v in =3.6v, v out =1.8v) mode=?h? forced pwm mode=?h? forced pwm 1.65 1.70 1.75 1.80 1.85 -10 0 10 20 30 40 50 60 70 80 90 time t (s ) output voltage v ou t (v) 0 200 400 output current i out (ma) ou tput v ol ta ge output current 1ma-->300ma 1.70 1.75 1.80 1.85 1.90 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k001c (v in =3.6v, v out =1.8v) rp505k001c (v in =3.6v, v out =1.8v) 1.65 1.70 1.75 1.80 1.85 -10 0 10 20 30 40 50 60 70 80 90 time t (s ) output voltage v ou t (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 300ma-->800ma 1.70 1.75 1.80 1.85 1.90 -10 0 10 20 30 40 50 60 70 80 90 time t (us) output voltage v out (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 800ma-->300ma
rp505 k 30 rp505k001c (v in =5.0v, v out =3.3v) rp505k001c (v in =5.0v, v out =3.3v) mode=?l?pwm/vfm automatic shift mode=?l?pwm/vfm automatic shift 3.15 3.20 3.25 3.30 3.35 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v ou t (v) 0 200 400 output current i out (ma) output voltage output current 1ma-->300ma 3.20 3.25 3.30 3.35 3.40 -100 0 100 200 300 400 500 600 700 800 900 time t (s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k001c (v in =5.0v, v out =3.3v) rp505k001c (v in =5.0v, v out =3.3v) mode=?h? forced pwm mode=?h? forced pwm 3.15 3.20 3.25 3.30 3.35 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v ou t (v) 0 200 400 output current i out (ma) output voltage output current 1ma-->300ma 3.20 3.25 3.30 3.35 3.40 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v out (v) 0 200 400 output current i out (ma) output voltage output current 300ma-->1ma rp505k001c (v in =5.0v, v out =3.3v) rp505k001c (v in =5.0v, v out =3.3v) 3.15 3.20 3.25 3.30 3.35 -10 0 10 20 30 40 50 60 70 80 90 time t (s) output voltage v ou t (v) 0 250 500 750 1000 output current i out (ma) output voltage output current 300ma-->800ma 3.20 3.25 3.30 3.35 3.40 -10 0 102030405060708090 tim e t (s) output voltage v out (v) 0 250 500 750 1000 output current i out (ma) ou tput v olta ge output current 800ma-->300ma
rp505 k 31 18) mode switching waveform rp505k181a/b (v in =3.6v, i out =1ma) rp505k181a/b (v in =3.6v, i out =1ma) mode=?l? --> mode=?h? mode=?h" --> mode=?l? 1.75 1.80 1.85 1.90 -200 0 200 400 600 800 time t (s) output voltage v ou t (v) 0 5 mode input voltage v mode (v) output voltage mode input voltage 1.75 1.80 1.85 1.90 -200 0 200 400 600 800 time t (s) output voltage v out (v) 0 5 mode input voltage v mod e (v) output voltage mode input voltage rp505k001c (v in =3.6v, v out =1.2v, i out =1ma) rp505k001c (v in =3.6v, v out =1.2v, i out =1ma) mode=?l? --> mode=?h? mode=?h? --> mode=?l? 1.15 1.20 1.25 1.30 -200 0 200 400 600 800 time t (s) output voltage v ou t (v) 0 5 mode input voltage v mode (v) output voltage mode input voltage 1.15 1.20 1.25 1.30 -200 0 200 400 600 800 time t (s) output voltage v ou t (v) 0 5 mode input voltage v mode (v) o utput voltage m ode input voltage rp505k001c (v in =3.6v, v out =1.8v, i out =1ma) rp505k001c (v in =3.6v, v out =1.8v, i out =1ma) mode=?l? --> mode=?h? mode=?h? --> mode=?l? 1.75 1.80 1.85 1.90 -200 0 200 400 600 800 time t (s) output voltage v ou t (v) 0 5 mode input voltage v mode (v) output voltage mode input voltage 1. 75 1. 80 1. 85 1. 90 -200 0 200 400 600 800 time t (s ) output voltage v out (v) 0 5 mode input voltage v mode (v) o utput voltage mode inp ut voltage
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