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1/35 xc9511 series synchronous step-down dc/dc converter with built-in ldo regulator in parallel plus voltage detector general description the xc9511 series consists of a step-down dc/dc converter and a high-speed ldo regulator connected in parallel with the dc/dc converter's output. a voltage detector is also built-in. since the input for the ldo voltage regulator block comes from the input power supply, it is suited for use with various applications. the dc/dc converter block incorporates a p-channel driver transistor and a synchronous n-channel switching transistor. with an external coil, diode and two capacitors, the xc9511 can deliver output currents up to 800ma at efficiencies over 90%. the xc9511 is designed for use with small ceramic capacitors. a choice of three switching frequencies are available, 300 khz, 600 khz, and 1.2 mhz. output voltage settings for the dc/dc and vr are set-up internally in 100mv steps within the range of 0.9v to 4.0v ( 2.0%). for the vd, the range is of 0.9v to 5.0v ( 2.0%). the soft start time of the series is internally set to 5ms. with the built-in u.v.l.o. (under voltage lock out) function, the internal p-channel driver transistor is forced off when input voltage becomes 1.4 v or lower. applications cd-r / rw, dvd hdd pdas, portable communication modem palmtop computers cellular phones cameras, video recorders typical application circuit features dc/dc converter with built-in ldo and vd function input voltage range : 2.4v ~ 6.0v low esr capacitor : ceramic capacitor compatible vd function : three vd sensing options for either v dd , d cout , or v rout package : sop-8 output voltage range : 0.9v ~ 4.0v (accuracy 2%) output current : 800ma control method : pwm or pwm/pfm selectable oscillation frequency : 300khz, 600khz, 1.2mhz regulator input : parallel input to dc/dc converter output voltage range : 0.9v ~ 4.0v (accuracy 2%) current limit : 600ma dropout voltage : 160mv@i out =200ma (v out =2.8v) high ripple rejection : 60db @1khz (v out =2.8v) typical performance characteristics x c9511axxx v in =5.0v, topr=25 o c, l: 4.7 h(cdrh4d28c) c in : 4.7 f(ceramic), c l 1: 10 f(ceramic), c l 2: 4.7 f(ceramic) * please refer to the typical application circuit when external com p onents are selected. sop-8 (top view) etr1008_001
2/35 xc9511 series designator description symbol description control methods and the vd sense pin as chart below : - setting voltage & specifications internal standard : setting voltage and specifications of each dc/dc, vr, and vd (based on the internal standard) 3 : 300khz 6 : 600khz dc/dc oscillation frequency c : 1.2mhz package s : sop-8 r : embossed tape, standard feed device orientation l : embossed tape, reverse feed pin number pin name function 1 p gnd power ground 2 p vdd power supply 1 3 a vdd power supply 2 4 v dout vd output 5 a gnd analog ground 6 v rout vr output 7 d cout dc/dc output 8 lx switch series dc/dc control methods vd sense a v dd b d cout c pwm control v rout d v dd e d cout xc9511 f pfm/pwm automatic switch v rout pin configuration pin assignment product classification ordering information xc9511 ????? the input for the voltage regulator block comes from v dd sop-8 ( top view ) control methods and vd sense pin pgnd 1 pvdd 2 a vdd 3 vdout 4 8 lx 7 dcout 6 vrout 5 agnd
3/35 x c9511 series parameter symbol ratings unit a vdd pin voltage a vdd - 0.3 ~ 6.5 v p vdd pin voltage p vdd a vdd - 0.3 ~ a vdd + 0.3 v d cout pin voltage d cout - 0.3 ~ a vdd + 0.3 v v rout pin voltage v rout - 0.3 ~ a vdd + 0.3 v v rout pin current i rout 800 ma v dout pin voltage v dout - 0.3 ~ v dd + 0.3 v v dout pin current i vd 50 ma lx pin voltage lx - 0.3 ~ v dd + 0.3 v lx pin current i lx 1300 ma power dissipation sop-8 pd 650 mw operating temperature range topr - 40 ~ + 85 storage temperature range tstg - 55 ~ + 125 block diagram absolute maximum ratings * diodes shown in the above circuit are p rotective diodes ta = 2 5 (*) when implemented on a glass epoxy pcb.
4/35 xc9511 series parameter symbol conditions min. typ. max. units circuit supply current 1 i dd 1 v in =ce=d cout =5.0v - 250 310 a 1 supply current 2 i dd 2 v in =ce=5.0v, d cout =0v - 300 360 a 1 input voltage range v in 2.4 - 6.0 v - parameter symbol conditions min. typ. max. units circuit output voltage dc out (e) connected to the external components i dout =30ma 1.470 1.500 1.530 v 3 oscillation frequency f osc connected to the external components i dout =10ma 1.02 1.20 1.38 mhz 3 maximum duty ratio maxduty d cout =0v 100 - - % 4 minimum duty ratio minduty d cout =v in - - 0 % 4 pfm duty ratio * xc9511d/e/f pfmduty connected to the external components no load 21 30 38 % 3 u.v.l.o. voltage (*1) vuvlo connected to the external components 1.00 1.40 1.78 v 3 lx sw ?high? on resistance (*2) rlxh d cout =0v, lx=v in -0.05v - 0.5 0.9 5 lx sw ?low? on resistance rlxl connected to the external components, v in =5.0v - 0.5 0.9 3 lx sw ?high? leak current (*11) ileakh v in =lx=6.0v, ce=0v - 0.05 1.00 a 11 lx sw ?low? leak current (*11) ileakl v in =6.0v, lx=ce=0v - 0.05 1.00 a 11 maximum output current imax1 connected to the external components 800 - - ma 3 current limit (*8) ilim1 1.0 1.1 - a 6 efficiency (*3) effi connected to the external components i dout =100ma - 90 - % 3 output voltage i dout =30ma temperature characteristics u dc out topr ? dc out -40 Q topr Q 85 - 100 - ppm/ 3 soft-start time tss connected to the external components, ce=0v t v in , i dout =1ma 2 5 10 ms 3 latch time (*4, 9) tlat connected to the external components, v in =ce=5.0v, short d cout by 1 resistor - 8 25 ms 10 electrical characteristics xc9511xxxcsx common characteristics topr=25 dc/dc converter (1.5v product) topr=25
5/35 x c9511 series parameter symbol conditions min. typ. max. units circuit output voltage vr out (e) ir out =30ma 3.234 3.300 3.366 v 2 maximum output current imax2 400 - - ma 2 load regulation u vr out 1ma Q ir out Q 100ma - 15 50 mv 2 dropout voltage 1 (*5) vdif 1 ir out =100ma - 50 110 mv 2 dropout voltage 2 vdif 2 ir out =200ma - 100 200 mv 2 ir out =30ma line regulation u vrout u v in ? vr out vr out (t)+1v Q v in Q 6v - 0.05 0.25 %/v 2 current limit ilim2 vr out =vr out (e) x 0.9 480 600 - ma 7 short-circuit current ishort vr out =vss - 30 - ma 7 ripple rejection rate psrr v in ={v out (t)+1.0} v dc +0.5vp-pac, ir out =30ma, f=1khz - 60 - db 12 output voltage ir out =30ma temperature characteristics u vr out u topr ? vr out -40 Q topr Q 85 - 100 - ppm/ 2 parameter symbol conditions min. typ. max. units circuit detect voltage v df (e) ce=0v 2.646 2.700 2.754 v 8 hysteresis range v hys v hys =[v dr (e) (*10) - v df (e)] / v df (e) x 100 2 5 8 % 8 vd output current ivd vdout=0.5v, ce=0v 1 - - ma 9 output voltage temperature characteristics u v df u topr ? vdf -40 Q topr Q 85 - 100 - ppm/ 8 electrical characteristics (continued) regulator (3.3v product) topr=25 detector (2.7v product) topr=25 test conditions: unless otherwise stated: dc/dc : vin=3.6v [dc out :1.5v] vr: v in = 4.3v (v in =vr out (t) + 1.0v) vd: v in =5.0v common conditions for all test items: ce=v in , mode=0v * vr out (t) : setting output voltage note: *1: including hysteresis operating voltage range. *2: on resistance ( )= 0.05 (v) / ilx (a). *3: effi = { ( output voltage x output current ) / ( input voltage x input current) } x 100 *4: time until it short-circuits dc out with gnd through 1 of resistance from a state of operation and is set to dc out =0v from current limit pulse generating. *5: vdif = (v in 1 (*6) - vr out 1 (*7) ) *6: v in 1 = the input voltage when vrout1 appears as input voltage is gradually decreased. *7: vr out 1 = a voltage equal to 98% of the output voltage whenever an amply stabilized i out {vr out (t) + 1.0v} is input. *8: current limit = when v in is low, limit current may not be reached because of voltage falls caused by on resistance or serial resistance of coils. *9: integral latch circuit=latch time may become longer and latch operation may not work when v in is 3.0v or more. *10: v dr(e) = vd release voltage *11: when temperature is high, a current of approximately 5.0 a (maximum) may leak. *12: when using the ic with a regulator output at almost no load, a capacitor should be placed as close as possible between avdd and agnd (c in 2), connected with low impedance. please also see the recommended pattern layout on page 13 for your reference. should it not be possible to place the input capacitor nearby, the regulated output level may increase up to the v dd level while the load of the dc/dc converter increases and the regulator output is at almost no load. xc9511xxxcsx (continued)
6/35 xc9511 series circuit 1 supply current circuit 2 output voltage (vr), load regulation, dropout voltage, maximum output current circuit 3 output voltage (dc/dc) oscillation frequency, u.v.l.o. voltage, soft start time circuit 4 minimum duty cycle, maximum duty cycle maximum output current, efficiency, (pfm duty cycle), circuit 5 lx on resistance circuit 6 current limit 1 (dc/dc) test circuits
7/35 x c9511 series circuit 7 current limit 2 (vr), short current (vr) circuit 8 detect voltage, release voltage (hysteresis range) * for the measurement of the vdd_sense products, the input voltage was controlled. circuit 9 vd output current circuit 10 latch time * for the measurement of the vdd_sense products, the input voltage was controlled. circuit 11 off-leak circuit 12 ripple rejection rate test circuits ( continued )
8/35 xc9511 series fosc l 1.2mhz 4.7 h (cdrh4d28c, sumida) 600khz 10 h (cdrh5d28, sumida) 300khz 22 h (cdrh6d28, sumida) c in c l1 c l2 * 2 i rout 300ma 4.7 f (ceramic, taiyo yuden) 4.7 f (ceramic, taiyo yuden) 10 f (ceramic, taiyo yuden) i rout R 300ma 10 f (ceramic, taiyo yuden) typical application circuit sop-8 ( top view ) operational explanation the xc9511 series consists of a synchronous step-down dc/dc converter, a high speed ldo voltage regulator, and a voltage detector. dc/dc converter the series consists of a reference voltage source, ramp wave circuit, error amplifier, pwm comparator, phase compensation circuit, output voltage adjustment resistors, driv er transistor, synchronous switch, current limiter circuit, u.v.l.o. circuit and others. the series ics compare, using the error amplifier, the voltage of the internal voltage reference source with the feedback voltage from the v out pin through split resistors. phase compensation is performed on the resulting error amplifier output, to input a si gnal to the pwm comparator to determine the turn-on time during pwm operation. the pwm comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output to the buffer driver circuit to cause the lx pin to output a switching duty cycle. this process is continuously performed to ensure stable output voltage. the current feedback circuit monitors the p-channel mos driver transistor current for each switching operation, and modulates the error amplifier output signal to provide multiple feedback signals. this enables a stable feedback loop even when a low esr capacitor, such as a ceramic capacitor, is used, ensuring stable output voltage. the reference voltage source provides the reference voltage to ensure stable output voltage of the dc/dc converter. the ramp wave circuit determines switching frequency. the frequency is fixed internally and can be selected from 300khz, 600 khz and 1.2 mhz. clock pulses generated in this circuit are used to produce ramp waveforms needed for pwm operation, and to synchronize all the internal circuits. the xc9511a to c series are pwm control, while the xc9511d to f series can be automatically switched to pwm/pfm control. the pwm mode of the xc9511a to c series are controlled on a specified frequency from light loads through to heavy loads. since the frequency is specified, the composition of a noise filter etc. becomes easy. however, the efficiency at the time of the light load may become low. the xc9511d to f series can switch to pwm/pfm automatic switching control. with the automatic pwm/pfm switching control function, the series ics are automatically switched from pwm control to pfm control mode under light load conditions. the series cannot control only pfm mode. if during light load conditions the coil current becomes discontinuous and on-time rate falls lower than 30%, the pfm circuit operates to output a pulse with 30% of a fixed on-time rate from the lx pin. during pfm operation with this fixed on-time rate, pulses are generated at different frequencies according to conditions of the moment. this causes a reduction in the number of switching operations per unit of time, resulting in efficiency improvement under light load conditions. however, since pulse output frequency is not consta nt, consideration should be given if a noise filter or the like is needed. necessary conditions for switching to pfm operation depend on input voltage, load current, coil value and other factors. sd *1: xb0asb03a1br (torex) *1 the dc/dc converter of the xc9511 series automatically switches between synchronous / non-synchronous. the schottky diode is not normally needed. however, in cases where high efficiency is required when using the dc/dc converter during light load while in non-synchronous operation, please connect a schottky diode externally. *2 please pay much attention when external components are selected as recommended value of c l 2 will be changed by the load current.
9/35 x c9511 series operational explanation ( continued ) the xc9511 series automatically switches between synchronous / non-synchronous according to the state of the dc/dc converter. highly efficient operations are achievable using the synchronous mode while the coil current is in a continuous state. the series enters non-synchronous operation when the built-in n-ch switching transistor for synchronous operation is shutdown, which happens when the load current becomes low and the operation changes to a discontinuous state. the ic can operate without an external schottky diode because the parasitic diode in the n-ch switching transistor provides the circuit's step-down operation. however, since vf of the parasitic diode is a high 0.6v, the efficiency level during non-synchronous operation shows a slight decrease. please use an external schottky diode if high efficiency is required during light load current. continuous mode: synchronous discontinuous mode: non-synchronous the current limiter circuit of the xc9511 series monitors the current flowing through the p-channel mos driver transistor connected to the lx pin and features a combination of the constant-current type current limit mode and the operation suspension mode. when the driver current is greater than a specific level, the constant-current type current limit function operates to turn off the pulses from the lx pin at any given timing. when the driver transistor is turned off, the limiter circui t is then released from the current limit detection state. at the next pulse, the driver transistor is turned on. however, the transistor is immediately turned off in the case of an over current state. when the over current state is eliminated, the ic resumes its normal operation. the ic waits for the over current state to end by repeating the steps ? through . if an over current state continues for 8msec* and the above three steps are repeatedly performed, the ic performs the function of latching the off state of the driver transistor, and goes into operation suspension mode. once the ic is in suspension mode, operations can be resumed by either turning the ic off via the ce pin, or by restoring power to the vin pin. the suspension mode does not mean a complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in operation. the constant-current type current limit of the xc9511 series can be set at 1.1a.
10/35 xc9511 series . when the v in pin voltage becomes 1.4 v or lower, the p-channel output driver transistor is forced off to prevent false pulse output caused by unstable operation of the internal circuitry. when the v in pin voltage becomes 1.8 v or higher, switching operation takes place. by releasing the u.v.l.o. function, the ic performs the soft start function to initiate output startup operation. the soft start function operates even when the v in pin voltage falls momentarily below the u.v.l.o. operating voltage. the u.v.l.o. circuit does not cause a complete shutdown of the ic, but causes pulse output to be suspended; therefore, the internal circuitry remains in operation. high speed ldo voltage regulator the voltage regulator block of the xc9511 series consists of a reference voltage source, error amplifier, and current limiter circuit. the voltage divided by split resistors is compared with the internal reference voltage by the error amplifier. the p-channel mosfet, which is connected to the v rout pin, is then driven by the subsequent output signal. the output voltage at the v rout pin is controlled and stabilized by a system of negative feedback. a stable output voltage is achievable even if used with low esr capacitors as a phase compensation circuit is built-in. the reference voltage source provides the reference voltage to ensure stable output voltage of the regulator. the error amplifier compares the reference voltage with the signal from v out , and the amplifier controls the output of the pch driver transistor. the voltage regulator block includes a combination of a constant current limiter circuit and a foldback circuit. the voltage regulator senses output current of the built-in p channel output driver transistor inside. when the load current reaches the current limit level, the current limiter circuit operates and the output voltage of the voltage regulator block drops. as a result of this drop in output voltage, the foldback circuit operates, output voltage drops further and the load current decreases. when the v rout and gnd pin are shorted, the load current of about 30ma flows. operational explanation ( continued ) voltage detector the detector block of the xc9511 series detects output voltage from the v dout pin while sensing either v dd , d cout , or vr out internally. (n channel open drain type)
11/35 x c9511 series application information 1. the xc9511 series is designed for use with a ceramic output capacitor. if, however, the potential difference between dropout voltage or output current is too large, a ceramic capacitor may fail to absorb the resulting high switching energy and oscillation could occur on the output. if the input-output potential difference is large, connect an electrolytic capacitor in parallel to compensate for insufficient capacitance. 2. spike noise and ripple voltage arise in a switching regulator as with a dc/dc converter. these are greatly influenced by external component selection, such as the coil inductance, capacitance values, and board layout of external components. once the design has been completed, verification with actual components should be done. 3. when the difference between v in and v out is large in pwm control, very narrow pulses will be outputted, and there is the possibility that some cycles may be skipped completely. 4. when the difference between v in and v out is small, and the load current is heavy, very wide pulses will be outputted and there is the possibility that some cycles may be skipped completely: in this case, the lx pin may not go low at all. notes on use dc/dc waveform (3.3v, 1.2mhz) 5. the ic's dc/dc converter operates in synchronous mode when the coil current is in a continuous state and non-synchronous mode when the coil current is in a discontinuous state. in order to maintain the load current value when synchronous switches to non-synchronous and vise versa, a ripple voltage may increase because of the repetition of switching between synchronous and non-synchronous. w hen this state continues, the increase in the ripple voltage stops. to reduce the ripple voltage, please increase the load capacitance value or use a schottky diode externally. when the current used becomes close to the value of the load current when synchronous switches to non- synchronous and vise ve rsa, the switching current value can be changed by changing the coil inductance value. in case changes to coil inductance are to values other than the recommended coil inductance values, verification with actual components should be done. ics = (v in - d cout ) x onduty / (l x fosc) ics: switching current from synchronous re ctification to non-synchronous rectification onduty: onduty ratio of p-ch driver transistor ( . =.step down ratio : d cout / v in ) l: coil inductance value fosc: oscillation frequency i dout : the dc/dc load current < external components> l:4.7 h(cdrh4d28c,sumida) cin:4.7 f(ceramic) cl:10 f(ceramic) < external components> l:4.7 h(cdrh4d28c,sumida) cin:4.7 f(ceramic) cl:10 f(ceramic)
12/35 xc9511 series application information (continued) 6. when the xc9511d to f series operate in pwm/pfm automatic switching control mode, the reverse current may become quite high around the load current value when synchronous switches to non-synchronous and vise versa (also refer to no. 5). under this condition, switch ing synchronous rectification and non-synchronous rectification may be repeated because of the reverse current, and the ripple voltage may be increased to 100mv or more. the reverse current is the current that flows in the p gnd direction through the n-ch driver transistor from the coil. the conditions which cause this operation are as follows. pfm duty < step down ratio = dc out / v in x 100 (%) pfm duty: 30% (typ.) please use xc9511a to c types (pwm control) in cases where the load current value of the dc/dc converter is close to synchronous. notes on use ( continued ) dc/dc waveform (1.8v, 600khz) @ vin=6.0v 7. with the dc/dc converter of the ic, the peak current of t he coil is controlled by the current limit circuit. since the peak current increases when dropout voltage or load current is high, current limit starts operating, and this can lead to instability. when peak current becomes high, please adjust the coil inductance value and fully check the circuit operation. in addition, please calculate the peak current according to the following formula: peak current : ipk = (v in - d cout ) x onduty / (2 x l x fosc) + i dout 8. when the peak current, which exceeds limit current flows within the specified time, the built-in driver transistor is turned off (the integral latch circuit). during the time un til it detects limit current and before the built-in transistor can be turned off, the current for limit current flows; therefore, care must be taken when selecting the rating for the coil or the schottky diode. 9. when v in is low, limit current may not be reached because of voltage falls caused by on resistance or serial resistance of the coil. 10. in the integral latch circuit, latch time may become longer and latch operation may not work when v in is 3.0v or more. 11. use of the ic at voltages below the recommended voltage range may lead to instability. 12. this ic and the external components should be used within the stated absolute maximum ratings in order to prevent damage to the device. 13. when using ic with a regulator output at almost no load, a capacitor should be placed as close as possible between a vdd and a gnd (c in 2), connected with low impedance. please also see the recommended pattern layout for your reference. should it not be possible to place the input c apacitor nearby, the regulated output level may increase up to the v dd level while the load of the dc/dc converter increases and the regulator output is at almost no load. < external components> l:10 h(cdrh5d28,sumida) cin:4.7 f(ceramic) cl:10 f(ceramic) step-down ratio: 1.8v / 6.0v = 30%
13/35 x c9511 series application information (continued) 14. should the bi-directional load current of the synchronous dc/dc converter and the regulator become large, please be careful of the power dissipation when in use. please calculate power dissipation by using the following formula. pd=pddc/dc + pdvr dc/dc power dissipation (when in synchronous operation): pddc/dc = i dout 2 x ron vr power dissipation: pdvr=(v in ? vr out ) x ir out ron: on resistance of the built-in driver transistor to the dc/dc (= 0.5 ) ron=rpon x pchonduty / 100 + rnon x (1 - pchonduty / 100) 15. the voltage detector circuit built-in the xc9511 series internally monitor the v dd pin voltage, the dc/dc output pin voltage and vr output pin voltage. for the xc9511b/c/e/f series, which voltage detector circuit monitors the dc/dc output pin voltage and the vr output pin voltage, please determine the detect voltage value (v df ) by the following equation. v df Q (setting voltage on both the d cout voltage and the v rout voltage) 85%* * an assumed value of tolerance among the dc out voltage, the vr out voltage, and the vd release voltage (the vd detect voltage and hysteresis range). instructions on pattern layout 1. in order to stabilize v in 's voltage level, we recommend that a by-pass capacitor (c in ) be connected as close as possible to the a vdd & a gnd pins. should it not be possible to place the input capacitors nearby, the regulated output level may increase because of the switching noise of the dc/dc converter. 2. please mount each external component as close to the ic as possible. 3. wire external components as close to the ic as possible and use thick, short connecting traces to reduce the circuit impedance. 4. make sure that the pcb gnd traces are as thick as possible, as variations in ground potential caused by high ground currents at the time of switching may result in instability of the dc/dc converter and have adverse influence on the regulator output. 5. if using a schottky diode, please connect the anode side to the a gnd pin through c in . characteristic degradation caused by the noise may occur depending on the arrangement of the schottky diode. 6. please use the a vdd and p vdd pins with the same electric potential. notes on use ( continued )
14/35 xc9511 series typical performance characteristics (a) dc/dc converter (1) efficiency vs. output current
15/35 x c9511 series typical performance characteristics (continued) (2) output voltage vs. output current (a) dc/dc converter (continued)
16/35 xc9511 series typical performance characteristics (continued) (3) output voltage vs. ripple voltage (a) dc/dc converter (continued)
17/35 x c9511 series typical performance characteristics (continued) (4) output voltage vs. ambient temperature (5) soft-start time vs. ambient temperature (a) dc/dc converter (continued)
18/35 xc9511 series typical performance characteristics (continued) ambient temperature :ta( ) ambient temperature :ta( ) (6) lx pch/nch on resistance vs. input voltage (7) oscillation frequency vs. ambient temperature (8) u.v.l.o. voltage vs. ambient temperature (a) dc/dc converter (continued)
19/35 x c9511 series typical performance characteristics (continued) (9-1) dc/dc load transient response (d cout : 1.5v, fosc: 1.2mhz) (a) pwm control* (*xc9511a/b/c series) (b) pwm/pfm automatic switching control* (*xc9511d/e/f series) (a) dc/dc converter (continued)
20/35 xc9511 series (9-2) dc/dc load transient response (d cout : 1.8v, fosc: 1.2mhz) (a) pwm control* (*xc9511a/b/c series) typical performance characteristics (continued) (b) pwm/pfm automatic switching control* (*xc9511d/e/f series) (a) dc/dc converter (continued)
21/35 x c9511 series typical performance characteristics (continued) (9-3) dc/dc load transient response (d cout : 3.3v, fosc: 600khz) (a) pwm control* (*xc9511a/b/c series) (b) pwm/pfm automatic switching control* (*xc9511d/e/f series) (a) dc/dc converter (continued)
22/35 xc9511 series typical performance characteristics (continued) (9-4) dc/dc load transient response (d cout : 1.5v, fosc: 600khz) (a) pwm control* (*xc9511a/b/c series) (b) pwm/pfm automatic switching control* (*xc9511d/e/f series) (a) dc/dc converter (continued)
23/35 x c9511 series typical performance characteristics (continued) (9-5) dc/dc load transient response (d cout : 1.8v, fosc: 600khz) (a) pwm control* (*xc9511a/b/c series) (b) pwm/pfm automatic switching control* (*xc9511d/e/f series) (a) dc/dc converter (continued)
24/35 xc9511 series typical performance characteristics (continued) (9-6) dc/dc load transient response (d cout : 3.3v, fosc: 600khz) (a) pwm control* (*xc9511a/b/c series) (b) pwm/pfm automatic switching control* (*xc9511d/e/f series) (a) dc/dc converter (continued)
25/35 x c9511 series typical performance characteristics (continued) (b) voltage regulator (1) output voltage vs. input voltage
26/35 xc9511 series typical performance characteristics (continued) (2) output voltage vs. output current (current limit) (b) voltage regulator (continued)
27/35 x c9511 series typical performance characteristics (continued) ta = - 4 0 (b) voltage regulator (continued) (3) dropout voltage vs. output current
28/35 xc9511 series typical performance characteristics (continued) (4) output voltage vs. output current (b) voltage regulator (continued)
29/35 x c9511 series typical performance characteristics (continued) (5) ripple rejection ratio vs. ripple frequency (b) voltage regulator (continued)
30/35 xc9511 series typical performance characteristics (continued) (6) vr load transient response (b) voltage regulator (continued)
31/35 x c9511 series typical performance characteristics (continued) (c) voltage detector (1) output current vs. input voltage (2) detect voltage vs. input voltage
32/35 xc9511 series typical performance characteristics (continued) (3) detect voltage, release voltage vs. ambient temperature (c) voltage detector (continued)
33/35 x c9511 series typical performance characteristics (continued) (d) common (1) supply current vs. ambient temperature (dc/dc & vr & vd)
34/35 xc9511 series mark oscillation frequency product series 3 300khz xc9511 xxx3ax 6 600khz xc9511 xxx6ax c 1.2mhz xc9511xxxcax mark production year 3 2003 4 2004 mark product series 1 1 xc9511xxxxsx mark dc/dc control vd sense product series a v dd xc9511axxxsx b d cout xc9511bxxxsx c pwm control v rout xc9511cxxxsx d v dd xc9511dxxxsx e d cout xc9511exxxsx f pwm, pfm/pwm manual switch v rout xc9511fxxxsx mark dc/dc vr vd product series 1 4 1.8v 3.3v 4.0v xc9511*14*s* marking rule sop-8 ? represents product series represents dc/dc control methods, mode pin and vd sense pin packaging information sop-8 ? represents detect voltage dc/dc,vr and vd (ex.) represents the production lot number 0 to 9,a to z reverse character 0 to 9, a to z repeated (g, i, j, o, q, w excepted) note: no character inversion used. represents single digit of production year (ex.) sop-8 (top view) represents oscillation frequency
35/35 x c9511 series 1. the products and product specifications contained herein are subject to change without notice to improve performance characteristics. consult us, or our representatives before use, to confirm that the information in this catalog is up to date. 2. we assume no responsibility for any infringement of patents, patent rights, or other rights arising from the use of any information and circuitry in this catalog. 3. please ensure suitable shipping controls (including fail-safe designs and aging protection) are in force for equipment employing products listed in this catalog. 4. the products in this catalog are not developed, designed, or approved for use with such equipment whose failure of malfunction can be reasonably expected to directly endanger the life of, or cause significant injury to, the user. (e.g. atomic energy; aerospace; transport; combustion and associated safety equipment thereof.) 5. please use the products listed in this catalog within the specified ranges. should you wish to use the products under conditions exceeding the specifications, please consult us or our representatives. 6. we assume no responsibility for damage or loss due to abnormal use. 7. all rights reserved. no part of this catalog may be copied or reproduced without the prior permission of torex semiconductor ltd.

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