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general description the max16903 is a small, synchronous buck converter with integrated high-side and low-side switches. the device is designed to deliver 1a with input voltages from +3.5v to +28v while using only 25a quiescent current at no load. voltage quality can be monitored by observing the pgood signal. the max16903 can operate in dropout by running at 97% duty cycle, making it ideal for automotive and industrial applications. the max16903 operates at a 2.1mhz frequency, allow - ing for small external components and reduced output ripple. it guarantees no am band interference. sync input programmability enables three frequency modes for optimized performance: forced fixed-frequency opera - tion, skip mode (ultra-low quiescent current of 25a), and synchronization to an external clock. the max16903 can be ordered with spread-spectrum frequency modulation, designed to minimize emi-radiated emissions due to the modulation frequency. the max16903 is available in a thermally enhanced, 3mm x 3mm, 10-pin tdfn package or a 16-pin tssop package. the max16903 operates over the -40c to +125c automotive temperature range. applications automotive industrial military high-voltage input-power dc-dc applications beneits and features meets stringent automotive quality and reliability requirements ? +3.5v to +28v input voltage range allows operation in cold crank conditions ? tolerates input-voltage transients to +42v ? enable-pin compatible from +3.3v logic level to +42v ? 1a minimum output current with overcurrent protection ? -40c to +125c automotive temperature range ? aec-q100 qualified increased efficiency and reduced bom cost and board space ? integrated high- and low-side fets ? fixed output voltages (see the selector guide and contact the factory for all available trimmed output-voltage options) ? 10-pin tdfn-ep or 16-pin tssop-ep packages low quiescent current helps designers meet stringent oem current requirements ? 25a quiescent current during skip mode operation high switching frequency allows use of small, low-cost external components ? 2.1mhz switching frequency with three modes of operation ? skip mode for efficient, low-power operation ? forced fixed-frequency operation ? external frequency synchronization reduced emi emissions at the switching frequency ? optional spread-spectrum frequency modulation 19-5038; rev 9; 11/15 note: insert the desired suffix letters (from selector guide) into the blanks to indicate the output voltage. alternative output volt - ages available upon request. +denotes a lead(pb)-free/rohs-compliant package. /v denotes an automotive qualified part. *ep = exposed pad. part spread spectrum temp range pin- package max16903raue__/v+ disabled -40c to +125c 16 tssop-ep* max16903ratb__/v+ disabled -40c to +125c 10 tdfn-ep* max16903saue__/v+ enabled -40c to +125c 16 tssop-ep* max16903satb__/v+ enabled -40c to +125c 10 tdfn-ep* max16903 2.1mhz, high-voltage, 1a mini-buck converter ordering information evaluation kit available downloaded from: http:///
max16903_50/v+ 20k ? 2.2f 33k ? en sync gnd v bat level signal pgood bias sup * place input supply capacitors as close as possible to the sup pin. see the applications information section for more details. 4.7f bst 0.1f 4.7h lx 10f pgnd 5v at 1a outs max16903_33/v+ 20k ? 2.2f 33k ? en sync gnd v bat level signal pgood bias sup 4.7f bst 0.1f * * 3.3h lx 10f pgnd 3.3v at 1a outs max16903 2.1mhz, high-voltage, 1a mini-buck converter www.maximintegrated.com maxim integrated 2 typical operating circuits downloaded from: http:///
(voltages referenced to gnd.) sup, en.................................................................-0.3v to +42v bst to lx..................................................................-0.3v to +6v lx.............................................................-0.3v to (v sup + 0.3v) bst.........................................................................-0.3v to +47v outs......................................................................-0.3v to +12v sync, pgood, bias............................................-0.3v to +6.0v pgnd to gnd .......................................................-0.3v to +0.3v lx continuous rms current.................................................1.5a outs short-circuit duration......................................continuous esd protection human body model .........................................................2kv machine model ..............................................................200v continuous power dissipation (t a = +70c) tdfn (derate 24.4 mw/c above +70c)..................1951mw tssop (derate 26.1 mw/c above +70c) ..............2089mw operating temperature range .........................-40c to +125c junction temperature......................................................+150c storage temperature range .............................-65c to +150c lead temperature (soldering, 10s) .................................+300c soldering temperature (reflow) .......................................+260c tdfn junction-to-ambient thermal resistance ( ja )...........41c/w junction-to-case thermal resistance ( jc )..................9c/w tssop junction-to-ambient thermal resistance ( ja )........38.3c/w junction-to-case thermal resistance ( jc )..................3c/w (note 1) (v sup = +14v, t a = t j = -40c to +125c, unless otherwise noted. typical values are at t a = +25c, unless otherwise noted.) parameter symbol conditions min typ max units supply voltage range v sup (note 2) 3.5 28 v t < 1s 42 supply current i sup en = low 4 8 a en = high, no load 3.3v and 5v output 25 35 1.8v output 40 65 90 en = high, continuous, no switching 1 ma uv lockout v uvlo bias rising 2.8 3 3.2 v v uvlo,hys hysteresis 0.4 bias voltage v bias +5.5v v sup +42v 5 v bias current limit i bias 10 ma max16903 2.1mhz, high-voltage, 1a mini-buck converter www.maximintegrated.com maxim integrated 3 note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. package thermal characteristicselectrical characteristics downloaded from: http:///
(v sup = +14v, t a = t j = -40c to +125c, unless otherwise noted. typical values are at t a = +25c, unless otherwise noted.) buck converter voltage accuracy v out,5v v out = 5v, ixed frequency 6v v sup 18v, i load = 0 to 1a, t a = 0c to +125c -2.0% 5 +2.5% v v out = 5v, skip mode (note 3) -2.0% 5 +4% v out,3.3v v out = 3.3v, ixed frequency -2.0% 3.3 +2.5% v out = 3.3v, skip mode (note 3) -2.0% 3.3 +4% v out,1.8v v out = 1.8v, ixed frequency -2.0% 1.8 +2.5% v out = 1.8v, skip mode (note 3) -2.0% 1.8 +4.0% v out,5v v out = 5v, ixed frequency 6v v sup 18v, i load = 0 to 1a, t a = -40c to +125c -3.0% 5 +2.5% v out = 5v, skip mode (note 3) -3.0% 5 +4% v out,3.3v v out = 3.3v, ixed frequency -3.0% 3.3 +2.5% v out = 3.3v, skip mode (note 3) -3.0% 3.3 +4% v out,1.8v v out = 1.8v, ixed frequency -3.0% 1.8 +2.5% v out = 1.8v, skip mode (note 3) -3.0% 1.8 +4% skip-mode peak current i skip 350 ma high-side dmos rds on r on,hs v bias = 5v 400 800 m? low-side dmos rds on r on,ls 250 450 m? dmos peak current-limit threshold i max 1.275 1.5 1.75 a soft-start ramp time t ss 7 8 9 ms lx rise time t rise,lx 5 ns minimum on-time t on 80 ns pwm switching frequency f sw internally generated 1.925 2.1 2.275 mhz sync input frequency range f sync 1.8 2.6 mhz spread-spectrum range ss spread-spectrum option only +6 % max16903 2.1mhz, high-voltage, 1a mini-buck converter www.maximintegrated.com maxim integrated 4 electrical characteristics (continued) downloaded from: http:///
note 2: when the typical minimum on-time of 80ns is violated, the device skips pulses. note 3: guaranteed by design; not production tested. (v sup = +14v, t a = t j = -40c to +125c, unless otherwise noted. typical values are at t a = +25c, unless otherwise noted.) electrical characteristics (continued) parameter symbol conditions min typ max units pgood pgood threshold v thr,pgd v out rising 88 93 98 % v thf,pgd v out falling 88 91 94 pgood debounce t deb 10 s pgood high leakage current i leak,pgd t a = +25c, v pgd v out 1 a pgood output low level v out,pgd sinking 1ma 0.4 v logic levelsen level v ih,en 2.4 v v il,en 0.6 en input current i in,en v en = v sup = +42v, t a = +25c 1 a sync switching threshold v ih,sync 1.4 v v il,sync 0.4 sync internal pulldown r pd,sync 200 k? thermal protection thermal shutdown t shdn 175 c thermal shutdown hysteresis t shdn,hys 15 c max16903 2.1mhz, high-voltage, 1a mini-buck converter www.maximintegrated.com maxim integrated 5 downloaded from: http:///
(v sup = +14v, t a = +25c, unless otherwise noted.) no-load supply current vs. input voltage (skip mode) max16903 toc02 input voltage (v) supply current (a) 26 24 22 20 18 16 14 12 10 8 10 20 30 40 50 60 0 6 28 5v part 3.3v part line regulation (i load = 1a) max16903 toc03 input voltage (v) output-voltage change (%) 26 24 8 10 12 16 18 20 14 22 -3 -2 -1 0 1 2 3 4 -4 6 28 load regulation max16903 toc04 load current (a) output-voltage change (%) 0.8 0.6 0.2 0.4 -3 -2 -1 0 21 3 4 -4 0 1.0 skip mode fff mode shutdown supply current vs. input voltage max16903 toc05 input voltage (v) supply current (a) 26 24 22 20 18 16 14 12 10 8 3 6 9 12 15 0 6 28 startup waveform (i load = 1a) max16903 toc06 i inductor 1a/divpgood 5v/div v out 5v/div en5v/div 1ms/div shutdown waveform (i load = 1a) max16903 toc07 i inductor 1a/divpgood 5v/div v out 5v/div en5v/div 20s/div efficiency vs. load current (5v version) max16903 toc01 i load (a) efficiency (%) 0.1 0.01 0.001 0.0001 10 20 30 40 50 60 70 80 90 100 0 0.00001 1 skip mode fff mode load-transient response (fixed mode) max16903 toc08 i load 1a/divpgood 5v/div v out 200mv/div 5v5v accoupled 200s/div i load = 100ma to 1a to 100ma maxim integrated 6 www.maximintegrated.com max16903 2.1mhz, high-voltage, 1a mini-buck converter typical operating characteristics downloaded from: http:///
(v sup = +14v, t a = +25c, unless otherwise noted.) pin name function tdfn tssop 1 1 bst bootstrap capacitor for high-side driver (0.1f) 2 2, 3 sup voltage supply input. connect a 4.7f ceramic capacitor from sup to pgnd. place the capacitor very close to the sup pin. for the tssop-ep package, connect both sup pins together for proper operation. 3 4, 5 lx buck switching node. lx is high impedance when the device is off. for the tssop package, connect both lx pins together for proper operation. 4 6, 7 pgnd power ground. for the tssop-ep package, connect both pgnd pins together for proper operation. load-transient response (skip mode) max16903 toc09 i load 1a/divpgood 5v/div v out 200mv/div 5v5v ac-coupled 200s/div i load = 100ma to 1a to 100ma undervoltage pulse (cold crank) max16903 toc10 v sup 10v/divv out 5v/divi load 1a/div pgood5v/div 14v 3.5v 10ms/div i load = 500ma standby current vs. load current max16903 toc11 i load (ma) i sup (a) 0.10 50 100 150 200 250 300 350 400 450 500 0 0.01 1.00 max16903 + 5 6 outs pgood 4 top view 7 pgnd sync 3 8 lx bias 2 9 sup gnd 1 tdfn 10 bst en ep max16903 + 8 9 outs n.c. 7 10 pgnd n.c. 6 11 pgnd pgood 3 14 sup gnd 2 15 sup en 1 16 bst n.c. 5 12 lx sync 4 tssop 13 lx bias ep maxim integrated 7 www.maximintegrated.com max16903 2.1mhz, high-voltage, 1a mini-buck converter typical operating characteristics (continued) pin description pin conigurations downloaded from: http:///
detailed description the max16903 is a small, current-mode buck convert - er that features synchronous rectification and requires no external compensation network. the max16903 is designed for 1a output current. the max16903 can stay in dropout by running at 97% duty cycle. it provides an accurate output voltage within the input range of +6.5v to +18v. voltage quality can be monitored by observing the pgood signal. the max16903 operates at 2.1mhz (typ) frequency, which allows for small external components, reduced output ripple, and guarantees no am band inter - ference. pin name function tdfn tssop 5 8 outs buck regulator voltage-sense input. bypass outs to pgnd with a 10f or larger x7r ceramic capacitor. 6 11 pgood open-drain power-good output 7 12 sync sync input. sync allows the device to synchronize to other supplies. when connected to gnd or unconnected, skip mode is enabled under light loads. when connected to a clock source or bias, forced pwm mode is enabled. 8 13 bias +5v internal logic supply. connect a 2.2f ceramic capacitor from bias to gnd. 9 14 gnd analog ground 10 15 en enable input. en is high-voltage compatible. drive en high for normal operation. 9, 10, 16 n.c. no connection. not internally connected. ep exposed pad. connect ep to pgnd. do not use ep as the only ground connection. max16903 lsd pwm eamp comp hsd bias lxpgnd bst sup logic control current-sense and slope compensation soft-start osc bandgap gnd v good pgood outs bias hvldo sync ref en clk max16903 2.1mhz, high-voltage, 1a mini-buck converter www.maximintegrated.com maxim integrated 8 pin description (continued)functional diagram downloaded from: http:///
the max16903 features an ultra-low 25a (typ) quiescent supply current in standby mode. standby mode is entered when load currents are below 5ma and when sync is low. the max16903 operates from a +3.5v to +28v supply voltage and tolerates transients up to +42v, making it ideal for automotive applications. the max16903 is available in factory-trimmed output voltages from 1.8v to 10.7v in 100mv steps. please contact factory for avail - ability of voltage options. enable (en) the max16903 is activated by driving en high. en is compatible from a +3.3v logic level to automotive battery levels. en can be controlled by microcontrollers and automotive key or can inhibit signals. the en input has no internal pullup/pulldown current to minimize over - all quiescent supply current. to realize a programmable undervoltage lockout level, use a resistor-divider from sup to en to gnd. bias/uvlo the max16903 features undervoltage lockout. when the device is enabled, an internal bias generator turns on. lx begins switching after v bias has exceeded the internal undervoltage lockout level v uvlo = 3v (typ). soft-start the max16903 features an internal soft-start timer. the output voltage soft-start ramp time is 8ms (typ). if a short circuit or undervoltage is encountered, after the soft-start timer has expired, the device is disabled for 30ms (typ) and it reattempts soft-start again. this pattern repeats until the short circuit has been removed. oscillator/synchronization and eficiency (sync) the max16903 has an on-chip oscillator that provides a switching frequency of 2.1mhz (typ). depending on the condition of sync, two operation modes exist. if sync is unconnected or at gnd, the device must operate in highly efficient pulse-skipping mode if the load current is below the skip mode current threshold. if sync is at bias or has a frequency applied to it, the device is in forced pwm mode. the max16903 offers the best of both worlds. the device can be switched during operation between forced pwm mode and skip mode by switching sync. skip mode operation skip mode is entered when the sync pin is connected to ground or is unconnected and the peak load current is < 350ma (typ). in this mode, the high-side fet is turned on until the current in the inductor is ramped up to 350ma (typ) peak value and the internal feedback voltage is above the regulation voltage (1.2v typ). at this point, both the high-side and low-side fets are turned off. depending on the choice of the output capacitor and the load current the high-side fet turns on when outs (valley) drops below the 1.2v (typ) feedback voltage. achieving high eficiency at light loads the max16903 operates with very low quiescent current at light loads to enhance efficiency and conserve battery life. when the max16903 enters skip mode the output current is monitored to adjust the quiescent current. when the output current is < 5ma, the max16903 oper - ates in the lowest quiescent current mode also called the standby mode. in this mode, the majority of the internal circuitry (excluding that necessary to maintain regulation) in the max16903, including the internal high-voltage ldo, is turned off to save current. under no load and with skip mode enabled, the ic draws only 25a (typ) current. for load currents > 5ma, the ic enters normal skip mode still maintaining very high efficiency. controlled emi with forced-fixed frequency in forced pwm mode, the max16903 attempts to operate at a constant switching frequency for all load currents. for tightest frequency control, apply the operating frequency to sync. the advantage of this mode is a constant switching frequency, which improves emi performance; the disadvantage is that considerable current can be thrown away. if the load current during a switching cycle is less than the current flowing through the inductor, the excess current is diverted to gnd. with no external load present, the operating current is in the 10ma range. extended input voltage range in some cases, the max16903 is forced to deviate from its operating frequency independent of the state of sync. for input voltages above 18v, the required duty cycle to regulate its output may be smaller than the minimum on- time (80ns, typ). in this event, the max16903 is forced to lower its switching frequency by skipping pulses. if the input voltage is reduced and the max16903 approach - es dropout the device tries to turn on the high-side fet continuously. in order to maintain gate charge on the high-side fet, the bst capacitor must be periodically recharged. to ensure proper charge on the bst capaci - tor when in dropout, the high-side fet is turned off every 6.5s and the low-side fet is turned on for about 150ns. this gives an effective duty cycle of > 97% and a switching frequency of 150khz when in dropout. spread-spectrum option the max16903 has an optional spread-spectrum version. if this option is selected, then the internal operating fre - quency varies by +6% relative to the internally generated max16903 2.1mhz, high-voltage, 1a mini-buck converter www.maximintegrated.com maxim integrated 9 downloaded from: http:///
operating frequency of 2.1mhz (typ). spread spectrum is offered to improve emi performance of the max16903. by varying the frequency 6% only in the positive direction, the max16903 still guarantees that the 2.1mhz frequency does not drop into the am band limit of 1.8mhz. additionally, with the low minimum on-time of 80ns (typ) no pulse skipping is observed for a 5v output with 18v input maximum battery voltage in steady state. the internal spread spectrum does not interfere with the external clock applied on the sync pin. it is active only when the max16903 is running with internally generated switching frequency. power-good (pgood) the max16903 features an open-drain power-good out - put. pgood is an active-high output that pulls low when the output voltage is below 91% of its nominal value. pgood is high impedance when the output voltage is above 93% of its nominal value. connect a 20k (typ) pullup resistor to an external supply or the on-chip bias output. overcurrent protection the max16903 limits the peak output current to 1.5a (typ). the accuracy of the current limit is 15%, which makes selection of external components very easy. to protect against short-circuit events, the max16903 will shut off when outs is below 1.5v (typ) and one overcurrent event is detected. the max16903 attempts a soft-start restart every 30ms and stays off if the short circuit has not been removed. when the current limit is no longer present, it reaches the output voltage by following the normal soft-start sequence. if the max16903 die reaches the thermal limit of 175c (typ) during the current-limit event, it immediately shuts off. thermal-overload protection the max16903 features thermal-overload protection. the device turns off when the junction temperature exceeds +175c (typ). once the device cools by 15c (typ), it turns back on with a soft-start sequence. applications information inductor selection the nominal inductor value can be calculated using table 1 based on the nominal output voltage of the device. select the nearest standard inductance value to the calcu - lated nominal value. the nominal standard value selected should be within 25% of l nom for best performance. input capacitor a low-esr ceramic input capacitor of 1f or larger is needed for proper device operation. this value may need to be larger based on application input-voltage ripple requirements. the discontinuous input current of the buck converter causes large input ripple current. the switching frequen - cy, peak inductor current, and the allowable peak-to-peak input-voltage ripple dictate the input capacitance require - ment. increasing the switching frequency or the inductor value lowers the peak-to-average current ratio yielding a lower input capacitance requirement. the input ripple comprises mainly of v q (caused by the capacitor discharge) and v esr (caused by the esr of the input capacitor). the total voltage ripple is the sum of v q and v esr . assume the input-voltage ripple from the esr and the capacitor discharge is equal to 50% each. the following equations show the esr and capaci - tor requirement for a target voltage ripple at the input: esr pp out out in q sw v esr i i 2 i d ( 1 d ) c v f ? ? = ? ?? + ???? ? = ? table 1. nominal output voltage values table 2. examples for standard output voltages v out (v) l nom (h) 1.8 to 3.1 v out /0.55 3.2 to 6.5 v out /0.96 6.6 to 8.1 v out /1.40 8.2 to 10 v out /1.75 v out (v) calculated l nom (h) standard value (h) 1.8 3.3 3.3 3.3 3.4 3.3 5.0 5.2 4.7 8.0 5.7 5.6 max16903 2.1mhz, high-voltage, 1a mini-buck converter www.maximintegrated.com maxim integrated 10 downloaded from: http:///
where: in out out pp in sw ( v v ) v i v f l ? ? ?= and: out in v d v = where i out is the output current, d is the duty cycle, and f sw is the switching frequency. use additional input capacitance at lower input voltages to avoid possible undershoot below the uvlo threshold during transient loading. output capacitor to maintain acceptable phase margin, a minimum ceramic output capacitor value of 10f is needed with a voltage rating 2 times the v out voltage. additional output capaci - tance may be needed based on application-specific output- voltage ripple requirements. the allowable output-voltage ripple and the maximum deviation of the output voltage during step load currents determine the output capacitance and its esr. the out - put ripple comprises of v q (caused by the capacitor discharge) and v esr (caused by the esr of the output capacitor). use low-esr ceramic or aluminum electrolytic capacitors at the output. for aluminum electrolytic capaci - tors, the entire output ripple is contributed by v esr . use the esr out equation to calculate the esr requirement and choose the capacitor accordingly. if using ceramic capacitors, assume the contribution to the output ripple voltage from the esr and the capacitor discharge to be equal. the following equations show the output capaci - tance and esr requirement for a specified output-voltage ripple. esr pp pp out q sw v esr i i c 8v f ? ? ? = ? ? = ? where: in out out pp in sw out_ripple esr q (v v ) v i v f l v vv ? ? ?= ?? +? i p-p is the peak-to-peak inductor current as calculated above and f sw is the converters switching frequency. the allowable deviation of the output voltage during fast transient loads also determines the output capacitance and its esr. the output capacitor supplies the step load current until the converter responds with a greater duty cycle. the response time (t response ) depends on the closed-loop bandwidth of the converter. the high switching frequency of the max16903 allows for a higher closed-loop bandwidth, thus reducing t response and the output capacitance requirement. the resistive drop across the output capacitors esr and the capacitor dis - charge causes a voltage droop during a step load. use a combination of low-esr tantalum and ceramic capacitors for better transient load and ripple/noise performance. keep the maximum output-voltage deviations below the tolerable limits of the electronics being powered. when using a ceramic capacitor, assume an 80% and 20% contribution from the output capacitance discharge and the esr drop, respectively. use the following equations to calculate the required esr and capacitance value: esr out step step response out q v esr i i t c v ? = = ? where i step is the load step and t response is the response time of the converter. the converter response time depends on the control-loop bandwidth. pcb layout guidelines careful pcb layout is critical to achieve low switching power losses and clean stable operation. use a multilayer board wherever possible for better noise immunity. refer to max16903 evaluation kit for recommended pcb lay - out. follow these guidelines for a good pcb layout: 1) the input capacitor (4.7f, see the applications schematic in the typical operating circuits) should be placed right next to the sup pins (pins 2 and 3 on the tssop-ep package) of the max16903. since the max16903 operates at 2.1mhz switching frequency, this placement is critical for effective decoupling of high-frequency noise from the sup pins. 2) solder the exposed pad to a large copper plane area under the device. to effectively use this copper area as heat exchanger between the pcb and ambient expose the copper area on the top and bottom side. add a few small vias or 1 large via on the copper pad max16903 2.1mhz, high-voltage, 1a mini-buck converter www.maximintegrated.com maxim integrated 11 downloaded from: http:///
for efficient heat transfer. connect the exposed pad to pgnd ideally at the return terminal of the output capacitor. 3) isolate the power components and high current paths from sensitive analog circuitry. 4) keep the high current paths short especially at the ground terminals. the practice is essential for stable jitter-free operation. 5) connect the pgnd and gnd together preferably at the return terminal of the output capacitor. do not connect them anywhere else. 6) keep the power traces and load connections short. this practice is essential for high efficiency. use thick copper pcb to enhance full load efficiency and power dissipation capability. 7) route high-speed switching nodes away from sensitive analog areas. use internal pcb layers as pgnd to act as emi shields to keep radiated noise away from the device and analog bypass capacitor. esd protection the esd tolerance for the max16903 is rated for human body model and machine model. the human body model discharge components are c s = 100pf and r d = 1.5k (figure 1). the machine model discharge components are c s = 200pf and r d = 0 (figure 2). figure 1. human body esd test circuit figure 2. machine model esd test circuit storage capacitor high- voltage dc source device under test charge-current- limit resistor discharge resistance 1m ? r d 1.5k ? c s 100pf storage capacitor high- voltage dc source device under test charge-current- limit resistor discharge resistance r d 0 ? c s 200pf max16903 2.1mhz, high-voltage, 1a mini-buck converter www.maximintegrated.com maxim integrated 12 downloaded from: http:///
note: all devices operate over the -40c to +125c automotive temperature range. +denotes a lead(pb)-free/rohs-compliant package. /v denotes an automotive qualified part. *ep = exposed pad. part output voltage (v) pin-package spread-spectrum switching frequency top mark max16903ratb50+ 5 10 tdfn-ep* (3mm x 3mm x 0.75mm) azo max16903ratb50/v+ 5 10 tdfn-ep* (3mm x 3mm x 0.75mm) avu max16903ratb18/v+ 1.8 10 tdfn-ep* (3mm x 3mm x 0.75mm) yes max16903raue50+ 5 16 tssop-ep* (5mm x 4.4mm) max16903raue50/v+ 5 16 tssop-ep* (5mm x 4.4mm) max16903satb50+ 5 10 tdfn-ep* (3mm x 3mm x 0.75mm) yes azq max16903satb50/v+ 5 10 tdfn-ep* (3mm x 3mm x 0.75mm) yes avw max16903satb18/v+ 1.8 10 tdfn-ep* (3mm x 3mm x 0.75mm) yes max16903saue50+ 5 16 tssop-ep* (5mm x 4.4mm) yes max16903saue50/v+ 5 16 tssop-ep* (5mm x 4.4mm) yes max16903ratb33+ 3.3 10 tdfn-ep* (3mm x 3mm x 0.75mm) azn max16903ratb33/v+ 3.3 10 tdfn-ep* (3mm x 3mm x 0.75mm) avt max16903raue33+ 3.3 16 tssop-ep* (5mm x 4.4mm) max16903raue33/v+ 3.3 16 tssop-ep* (5mm x 4.4mm) max16903satb33+ 3.3 10 tdfn-ep* (3mm x 3mm x 0.75mm) yes azp max16903satb33/v+ 3.3 10 tdfn-ep* (3mm x 3mm x 0.75mm) yes avv max16903saue33+ 3.3 16 tssop-ep* (5mm x 4.4mm) yes max16903saue33/v+ 3.3 16 tssop-ep* (5mm x 4.4mm) yes max16903 2.1mhz, high-voltage, 1a mini-buck converter www.maximintegrated.com maxim integrated 13 selector guide downloaded from: http:///
package type package code outline no. land pattern no. 10 tdfn-ep t1033+1 21-0137 90-0003 16 tssop-ep u16e+3 21-0108 90-0120 max16903 2.1mhz, high-voltage, 1a mini-buck converter www.maximintegrated.com maxim integrated 14 package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. chip information process: bicmos downloaded from: http:///
revision number revision date description pages changed 0 10/09 initial release 1 7/10 updated the general description, typical operating circuits, absolute maximum ratings, electrical characteristics table , typical operating characteristics, pin description, and detailed description 1C10 2 8/10 corrected a typo in the tssop pin coniguration (pin 2 is sup, not n.c.) 6 3 3/11 updated the voltage accuracy and dmos peak current-limit threshold parameters in the electrical characteristics , updated the high-side fet in the skip mode operation section and the output current in the inductor selection section 3, 4, 8, 9 4 4/13 replaced the inductor selection section, and updated the input capacitor , output capacitor , and selector guide sections 9C11 5 9/14 updated typical operating circuits 2 6 9/14 updated pgood high leakage current in electrical characteristics 4 7 1/15 updated beneits and features section 1 8 9/15 updated pgood threshold (v out rising) in electrical characteristics 4 9 11/15 added 1.8v package variants to electrical characteristics and selector guide tables 3, 12 maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and speciications without n otice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. ? 2015 maxim integrated products, inc. 15 max16903 2.1mhz, high-voltage, 1a mini-buck converter revision history for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///

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