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max16956 36v, 300ma, mini buck converter with 1.1a i q general description the max16956 is a small, synchronous buck converter with integrated high-side and low-side switches. the device is designed to deliver up to 300ma with input voltages from 3.5v to 36v, while using only 1.1a quiescent current at no load (fixed-output versions). voltage quality can be monitored by observing the reset signal. the device can operate near dropout by running at 97% duty cycle, making it ideal for automotive applications under cold-crank. the device offers fixed-output voltages of 5v and 3.3v, as well as an adjustable version. the adjustable version allows the user to program the output voltage between 1v and 10v by using a resistor-divider. frequency is fixed at 2.1mhz, which allows for small external components, reduced output ripple, and minimized am radio interfer - ence. the device offers both forced-pwm and skip modes of operation, with ultra-low quiescent current of 1.1a in skip mode. the device can be ordered with spread- spectrum frequency modulation designed to minimize emi-radiated emissions due to the switching frequency. the max16956 is available in a small (3mm x 3mm) 10-pin max ? package and operates across the full auto - motive temperature range of -40c to +125c. the device is aec-q100 qualified. applications automotive body ecus point-of-load applications distributed dc power systems beneits and features integration and high-switching frequency saves space ? dc-dc converter up to 300ma capability ? fixed 5v/3.3v or programmable output-voltage options (1v to 10v) ? current-mode-control architecture ? 2.1mhz operating frequency ? fixed 5.4ms internal soft-start spread-spectrum frequency modulation reduces emi emissions low i q enables designers to meet stringent oem module power-consumption requirements ? 1.1a quiescent current in standby mode (fixed-output-voltage versions only) wide input voltage range supports automotive applications ? operating v in range: 3.5v to 36v (42v tolerant) ? 97% (max) duty-cycle operation with low dropout robust performance supports wide range of automotive applications ? short-circuit, thermal protections ? -40c to +125c automotive temperature range ? aec-q100 qualified 19-6737; rev 5; 10/15 max is a registered trademark of maxim integrated products, inc. typical application circuits, ordering information, and selector guide appear at end of data sheet. evaluation kit available downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q www.maximintegrated.com maxim integrated 2 electrical characteristics (v sup = v en = 14v, v mode = 0v, t a = t j = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c, unless otherwise noted.) (note 2) 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 . (voltages referenced to pgnd) sup ....................................................................... -0.3v to +42v en.............................................................. -0.3v to v sup + 0.3v bst to lx .............................................................................. +6v bst............................................. ........................... -0.3v to +47v mode, out/fb, reset ................. ........ -0.3v to v bias + 0.3v agnd................................................................ ... -0.3v to +0.3v bias.................... ................................................. -0.3v to +6.0v out/fb short-circuit duration ..................................continuous continuous power dissipation (t a = +70 c) (derate 12.9mw/oc above +70 c) ............................ 1031mw operating temperature range ......................... -40 c to +125 c junction temperature ...................................................... +150 c storage temperature range ............................ -65 c to +150 c lead temperature (soldering, 10s) ................................... 300 c soldering temperature (reflow) ....................................... +260oc package thermal characteristics (note 1) max junction-to-ambient thermal resistance ( b ja )....... 77.6 c/w junction-to-case thermal resistance ( b jc ) .................... 5 c/w absolute maximum ratings parameter symbol conditions min typ max units supply voltage v sup 3.5 36 v supply voltage v sup t < 500ms (note 3) 42 v supply current i sup v en = 0v 0.75 3.0 a no load, ixed 3.3v v out 1.1 3.0 no load, ixed 5v v out 1.8 5.0 no load, adjustable v out 32 70 v mode = v bias , no load, fpwm, no switching 0.5 1 1.5 ma uv lockout v bias rising 3.0 3.2 3.4 v hysteresis 0.4 bias regulator voltage v bias v sup = 5.5v to 36v (max16956c/f only) 5 v bias current limit 10 ma buck converter voltage accuracy v out,5v v out = 5v 6v v sup 36v, i load = 0 to 300ma 4.9 5.0 5.2 v v out,3.3v v out = 3.3v 3.2 3.3 3.4 output voltage range v out adjustable output versions 1 10 v fb voltage accuracy v fb adjustable output versions, 6v v sup 36v 0.98 1.0 1.03 v fb input current i fb v fb = 1v 0.02 a fb load regulation v load i load = 0.3ma to 300ma 1 % downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q www.maximintegrated.com maxim integrated 3 electrical characteristics (continued) (v sup = v en = 14v, v mode = 0v, t a = t j = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units fb line regulation v line 6v v sup 36v 0.02 %/v high-side dmos r dson r on,hs v bias = 5v, i lx = 200ma 1000 2200 m low-side dmos r dson r on,ls v bias = 5v, i lx = 200ma 500 1200 m dmos high-side current-limit threshold i max 0.425 0.5 0.575 a dmos high-side skip-mode peak-current threshold i skip 70 100 130 ma dmos low-side zero-crossing threshold i zx 40 ma dmos low-side negative current-limit threshold i neg fpwm mode -0.320 a soft-start ramp time t ss 5.4 ms lx rise time t rise,lx (note 3) 6 ns minimum on-time t on_min 60 ns maximum duty cycle dc max 97 % pwm switching frequency f sw 1.95 2.1 2.25 mhz spread-spectrum range ss spread-spectrum option only 6 % reset output ( reset ) reset threshold v thr_res v out rising 90 92 94 %v out v thf_res v out falling 88 90 92 reset debounce t deb 12 s reset high leakage current i leak,res t a = +25c 1 a reset low level v out,res sinking 1ma 0.4 v logic levels en input high threshold v ih,en 2.4 v en input low threshold v il,en 0.4 v en input current i in,en 0.1 a mode input high threshold v ih,mode 1.4 v mode input low threshold v il,mode 0.4 v mode internal pulldown r pd,mode 1000 k thermal protection thermal shutdown t shdn (note 3) +175 c thermal-shutdown hysteresis t shdn,hys (note 3) +15 c note 2: limits are 100% tested at t a = +25c (and/or t a = +125c). limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization. note 3: guaranteed by design; not production tested. note 4: when the typical minimum on-time of 80ns is violated, the device skips pulses. downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q www.maximintegrated.com maxim integrated 4 typical operating characteristics ( v sup = v en = 14v, t a = +25 c, unless otherwise noted.) 3.3v efficiency vs. load currentskip mode (1a to 300a) max16956 toc01 efficiency (%) 10 20 30 40 50 60 70 80 90 100 0 i out1 (a) 0 0.0003 0.00025 0.00015 0.0002 0.0001 0.00005 5v efficiency vs. load currentskip mode (1a to 300a) max16956 toc02 i out1 (a) 0 0.0003 efficiency (%) 10 20 30 40 50 60 70 80 90 100 0 0.00025 0.00015 0.0002 0.0001 0.00005 3.3v efficiency vs. load current max16956 toc03 efficiency (%) 10 20 30 40 50 60 70 80 90 100 0 skip pwm i out1 (a) 0.000001 1 0.1 0.001 0.01 0.0001 0.00001 5v efficiency vs. load current max16956 toc04 efficiency (%) 10 20 30 40 50 60 70 80 90 100 0 i out1 (a) 0.000001 1 0.1 0.001 0.01 0.0001 0.00001 skip pwm 5v fixed-output startup waveforms (skip, 300ma load) max16956 toc06 v lx 10v/div v reset 5v/div v sup 10v/divv out 5v/div 2ms/div 3.3v fixed-output startup waveform (pwm, 300ma load) max16956 toc05 v lx 10v/div v reset 5v/div v sup 10v/divv out 2v/div 2ms/div no-load supply current vs. temperature (skip mode) max16956 toc07 temperature (c) no-load supply current (a) 120 100 80 60 40 20 0 -20 0.5 1.0 1.5 2.0 2.5 3.0 0 -40 140 v out = 3.3v downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q maxim integrated 5 www.maximintegrated.com typical operating characteristics (continued) ( v sup = v en = 14v, t a = +25 c, unless otherwise noted. ) load regulation (3.3v output) max16956 toc08 load current (a) output-voltage change (%) 0.25 0.20 0.15 0.10 0.05 -2 -1 0 1 2 3 -3 0 0.30 pwm skip load regulation (5v output) max16956 toc09 load current (a) output-voltage change (%) 0.25 0.20 0.15 0.10 0.05 -2 -1 0 1 2 3 -3 0 0.30 pwm skip line regulation (3.3v output) max16956 toc10 input voltage (v) output-voltage change (%) 31 26 21 16 11 -2 -1 0 1 2 3 -3 6 36 i load = 300ma line regulation (5v output) max16956 toc11 input voltage (v) output-voltage change (%) 31 26 21 16 11 -2 -1 0 1 2 3 -3 6 36 i load = 300ma load-transient response (3.3v, pwm mode) max16956 toc13 v pgood 5v/div i load 200ma/div 3.3v 5v v out 50mv/divac-coupled 200s/div load-transient response (3.3v, skip mode) max16956 toc12 v pgood 5v/div i load 200ma/div 3.3v3.3v v out 100mv/divac-coupled 200s/div load-transient response (5v, skip mode) max16956 toc14 v pgood 5v/div i load 200ma/div 5v5v v out 100mv/divac-coupled 200s/div downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q maxim integrated 6 www.maximintegrated.com typical operating characteristics (continued) ( v sup = v en = 14v, t a = +25 c, unless otherwise noted. ) load-transient response (5v, pwm mode) max16956 toc15 v pgood 5v/div i load 200ma/div 5v5v v out 50mv/divac-coupled 200s/div 5v fixed-output cold-crank response (skip, no load) max16956 toc17 v lx 10v/div v sup 10v/divv out 5v/divv bias 5v/div 400ms/div 5v fixed dips and drops response (skip, no load) max16956 toc19 v lx 10v/div v sup 10v/divv out 5v/divv bias 5v/div 40ms/div 3.3v fixed-output cold-crank response (pwm, 300ma load) max16956 toc16 v lx 10v/div v sup 10v/divv out 2v/divv bias 5v/div 400ms/div 3.3v fixed-output dips and drops response (pwm, 300ma load) max16956 toc18 v lx 10v/div v sup 10v/divv out 2v/divv bias 5v/div 40ms/div 3.3v fixed-output slow v sup response (pwm, no load) max16956 toc20 v lx 10v/div v sup 10v/divv out 2v/divv bias 5v/div 10s/div downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q maxim integrated 7 www.maximintegrated.com typical operating characteristics (continued) ( v sup = v en = 14v, t a = +25 c, unless otherwise noted. ) 5v fixed-output slow v sup response (skip, no load) max16956 toc21 v lx 10v/div v sup 10v/divv out 5v/divv bias 5v/div 10s/div short-circuit response (pwm mode) max16956 toc23 v lx 10v/div i lx 500ma/divv out 2v/divv pgood 5v/div 4ms/div 3.3v 5v 0a 5v fixed-output load-dump response (skip, v sup = 13.5v to 42v, no load) max16956 toc25 v sup 10v/divv out 5v/divv bias 5v/div 100ms/div switching frequency vs. temperature max16956 toc22 temperature (c) switching frequency (mhz) 120 100 80 60 40 20 0 -20 2.00 2.05 2.10 2.15 2.20 2.251.95 -40 140 v out = 3.3v shutdown current vs. temperature max16956 toc24 temperature (c) shutdown current (a) 120 100 80 60 40 20 0 -20 0.4 0.8 1.2 1.6 2.0 0 -40 140 downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q www.maximintegrated.com maxim integrated 8 pin conigurationpin description pin name function 1 bst high-side driver supply. connect a 0.1f bootstrap capacitor between lx and bst. 2 sup ic supply input. connect a minimum of 4.7f ceramic capacitor from sup to pgnd. 3 lx buck switching node. lx is high impedance when the device is off. 4 pgnd power ground. connect to agnd under the device in a star coniguration. 5 agnd analog ground. connect to pgnd under the device in a star coniguration. 6 reset open-drain reset output. an external pullup resistor is required. 7 mode mode switch-control input. connect to ground or leave open to enable skip-mode operation under light loads. connect to bias to enable forced-pwm mode. mode has a 1m internal pulldown. 8 bias 5v internal logic supply. connect a 1f ceramic capacitor to agnd. 9 out/fb max16956a/b/d/e (fixed output): buck regulator voltage-sense input. bypass out to pgnd with a minimum 22f x7r ceramic capacitor. max16956c/f (adjustable output): feedback input. connect fb to a resistive divider between the buck output and agnd to set the output voltage. 10 en sup voltage-compatible enable input. drive en low to disable the device. drive en high to enable the device. ep exposed pad. connect ep to a large copper ground plane for effective power dissipation. do not use ep as the only ic ground connection. ep must be connected to pgnd. enout /f b biasmode reset sup bst lx pgndagnd + max16956 max top view *exposed pad * 10 98 7 6 1 23 4 5 downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q www.maximintegrated.com maxim integrated 9 block diagram current sense + slope comp logic control bias clk bstsup en bias out /f b sw1 sw2 reset agnd lx note 1: for interna l feedback version, sw1 is open and sw2 closed. externa l pin is called ou t. note 2: for externa l feedback version, sw1 is closed and sw2 open. externa l pin is called fb. pgnd hvldo mode bandgap osc ref softstart out out or fb fb v good comp eamp pwm max16956 downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q www.maximintegrated.com maxim integrated 10 detailed description the max16956 is a small, current-mode buck converter that features synchronous rectification and requires no external compensation network. the device operates from a 3.5v to 36v supply voltage and can deliver up to 300ma output current. frequency is fixed at 2.1mhz, which allows for small external components, reduced output ripple, and guarantees no am-band interference. the device offers fixed output voltages of 5v and 3.3v. the device also offers adjustable output-voltage versions that can be set between 1v and 10v by using an exter - nal resistive divider. voltage quality can be monitored by observing the reset signal. the device offers both forced-pwm and skip mode, with ultra-low-quiescent cur - rent of 1.1a in skip mode. dc-dc converter control architecture the device step-down converter uses a pwm peak current- mode control scheme, with a load-line architecture. peak current-mode control provides several advantages over voltage-mode control, including precise control of the induc - tor current on a cycle-by-cycle basis, simpler compensa - tion, and inherent compensation for line voltage variation. an internal transconductance amplifier establishes an integrated error voltage. the heart of the pwm control - ler is an open-loop comparator: one input is the inte - grated voltage-feedback signal; the other consists of the amplified current-sense signal plus slope-compensation ramp. integrated high-side current sensing is used, which reduces component count and layout risk by eliminating the need to carefully route sensitive external signals. error-amplifier compensation is also integrated, once again simplifying the power-supply designers task while eliminating external components. at each rising edge of the internal clock, the high-side mosfet turns on until the pwm comparator trips, the maximum duty cycle is reached, or the peak current limit is reached (see the current limit /short-circuit protection section). during this on-time, current ramps up through the inductor, storing energy in a magnetic field and sourcing current to the output. the current-mode feed - back system regulates the peak inductor current as a function of the output-voltage error signal. during the second-half of the cycle, the high-side mosfet turns off and the low-side mosfet turns on. the inductor releases the stored energy as the current ramps down, providing current to the output. the output capacitor stores charge when the inductor current exceeds the required load current and discharges when the inductor current is lower, smoothing the voltage across the load. the device features load-line architecture to reduce the output capacitance needed, potentially saving system cost and size. the output voltage is positioned slightly positive at no load, still within the tolerance window, to take advantage of the fact that any load disturbance is a load step only. this increases the amount of margin available to the undershoot that occurs on a load step, allowing a reduction in the required output capacitance. as the load increases, a small but controlled amount of load regulation (load-line) error occurs, so that at heavier loads the voltage is positioned slightly below nominal. this takes advantage of the fact that any load disturbance is load released, increasing the amount of margin available to the overshoot that occurs. the device can operate in either forced-pwm or skip mode. in forced-pwm mode, the converter maintains a constant switching frequency, regardless of load, to allow for easier filtering of the switching noise. the device includes proprietary circuitry that dramatically reduces quiescent current consumption in skip mode, improving light-load efficiency. see the forced pwm/skip modes section for further details.system enable (en) an enable control input (en) activates the device from its low-power shutdown mode. en is compatible with inputs from automotive battery level down to 3.5v. the high- voltage compatibility allows en to be connected to sup, key/kl30, or the inhibit pin (inh) of a can transceiver. linear regulator output (bias) the device includes a 5v linear regulator output (bias) that provides power to the internal circuit blocks. connect a 1f ceramic capacitor from bias to agnd. do not load this pin externally. undervoltage lockout when v bias drops below the undervoltage-lockout (uvlo) level of v uvlo = 2.8v (typ), the device assumes that the supply voltage is too low for proper operation, so the uvlo circuitry inhibits switching. when v bias rises above the uvlo rising threshold, the controller enters the startup sequence and then resumes normal operation. downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q www.maximintegrated.com maxim integrated 11 startup and soft-start the device features an internal soft-start timer. the output-voltage soft-start ramp time is 5.4ms (typ). if a short circuit or undervoltage is encountered after the soft- start timer has expired, the device is disabled for 13.4ms (typ) and then reattempts soft-start again. this pattern repeats until the short circuit has been removed. reset output the device features an open-drain reset output to monitor the output voltage. the reset output requires an external pullup resistor. reset goes high (high impedance) after the regulator output increases above 92% of the nominal regulated voltage. reset goes low when the regulator output drops to below 90% of the nominal regulated voltage. forced pwm/skip modes the device features a logic-level input (mode) to switch between forced-pwm and skip modes. connecting mode to bias enables the forced-pwm operation. connecting mode to ground, or leaving unconnected, enables skip- mode operation with ultra-low-quiescent current of 1.1a. in skip-mode operation, the converters switching frequen - cy is load dependent until the output load reaches the skip threshold. at higher load current, the switching frequency does not change and the operating mode is similar to the forced-pwm mode. skip mode helps improve efficiency in light-load applications by allowing the converter to turn on the high-side switch only when the output voltage falls below a set threshold. as such, the converter does not switch the mosfets on and off as often as is the case in the forced-pwm mode. consequently, the gate charge and switching losses are much lower in skip mode. current limit /short-circuit protection the device has fault protection designed to protect itself from abnormal conditions. if the output is soft shorted (meaning the output is overloaded but over 50% of regulation), cycle-by-cycle current limit limits how high the inductor current goes for any cycle. if the output is hard shorted to ground and the output falls to less than 50% of regulation, the part goes into a mode where it switches until 15 cycles are ended by current limit, then waits for 13.4ms before trying to soft-start again. this mode of operation limits the amount of power dissipated by the device under these conditions. the device also has overtemperature protection. if the die temperature exceeds approximately 175 c, the device stops switching until the die temperature drops by approximately 15 c and then resumes operation, including going through soft-start again. spread-spectrum option the device has an internal spread-spectrum option to optimize emi performance. this is factory set on the d, e, and f variants of the device. for spread-spectrum- enabled variants of the device, the operating frequency is varied 6% centered on 2.1mhz. the modulation signal is a trian gular wave with a period of 230s at 2.1mhz. therefore, f sw ramps down 6% and back to 2.1mhz in 115s and also ramps up 6% and back to 2.1mhz in 115s. the cycle repeats. applications information setting the output voltage the devices adjustable output-voltage version (see the selector guide for more details) allows the user to set the output to any voltage between 1v and 10v. connect a resistive divider from output (v out ) to fb to agnd to set the output voltage (figure 1). select r2 (fb to agnd resistor) less than or equal to 100k. calculate r1 (v out to fb resistor) with the following equation: out fb v r1 r2 1 v ?? ?? = ? ?? ?? ?? ?? ?? where v fb = 1v (see the electrical characteristics ). figure 1. adjustable output-voltage setting r1r2 fb v out max16956 downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q www.maximintegrated.com maxim integrated 12 inductor selection three key inductor parameters must be specified for operation with the device: inductance value (l), inductor saturation current (i sat ), and dc resistance (r dcr ). to select inductance value, the ratio of inductor peak-to- peak ac current to dc average current (lir) must be selected first. a good compromise between size and loss is a 30% peak-to-peak ripple current to average current ratio (lir = 0.3). the switching frequency, input voltage, output voltage, and selected lir then determines the inductor value as follows: out sup out sup sw out v (v v ) l v f i lir ? = where v sup , v out , and i out are typical values (so that efficiency is optimum for typical conditions). the switching frequency is 2.1mhz. table 1 lists some of the inductor val - ues for 300ma output current and several output voltages. input capacitor the input filter capacitor reduces peak currents drawn from the power source and reduces noise and voltage ripple on the input caused by the circuits switching. the input capacitor rms current requirement (i rms ) is defined by the following equation: out sup out rms load(max) sup v (v v ) ii v ? = i rms has a maximum value when the input voltage equals twice the output voltage (v sup = 2v out ), so i rms(max) = i load(max) /2. choose an input capacitor that exhibits less than +10c self-heating temperature rise at the rms input current for optimal long-term reliability. the input voltage ripple is composed of v q (caused by the capacitor discharge) and v esr (caused by the esr of the capacitor). use low-esr ceramic capacitors with high ripple current capability at the input. assume the contribution from the esr and capacitor discharge equal to 50%. calculate the input capacitance and esr required for a specified input voltage ripple using the following equations: esr in l out v esr i i 2 ? = ? + where: sup out out l sup sw (v v ) v i v fl ? ?= and: out out in q sw sup i d(1 d) v c and d vf v ? = = ? where i out is the maximum output current and d is the duty cycle.output capacitor the output filter capacitor must have low enough esr to meet output ripple and load transient requirements. the output capacitance must be high enough to absorb the inductor energy while transitioning from full-load to no- load conditions. when using high-capacitance, low-esr capacitors, the filter capacitors esr dominates the out - put voltage ripple. therefore, the size of the output capac - itor depends on the maximum esr required to meet the output voltage ripple (v ripple(p-p) ) specifications: ripple(p p) load(max) v esr i lir ? = the actual capacitance value required relates to the physical size needed to achieve low esr, as well as to the chemistry of the capacitor technology. therefore, the capacitor is usually selected by esr and voltage rating rather than by capacitance value. when using low-capacity filter capacitors, such as ceram - ic capacitors, size is usually determined by the capacity needed to prevent voltage droop and voltage rise from causing problems during load transients. generally, once enough capacitance is added to meet the overshoot requirement, undershoot at the rising-load edge is no longer a problem. table 1. inductor values for 300ma output current v sup /v out (v) 14v/5v 14v/3.3v inductor (h) i load = 300ma 10h (typ) 22h (max) 10h (typ) 22h (max) downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q www.maximintegrated.com maxim integrated 13 pcb layout guidelinescareful pcb layout is critical to achieve low-switching power losses and clean, stable operation. use a multi - layer board whenever possible for better noise immunity and power dissipation. follow these guidelines for good pcb layout: 1) the input capacitor (4.7f, see figures 3 and 4) should be placed immediately next to the sup pin of the device. since the device operates at 2.1mhz switch - ing frequency, this placement is critical for effective decoupling of high-frequency noise from the sup pin. 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 sides. add a few small vias or one large via on the copper pad 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 path from the sensitive analog circuitry. doing so is essential to prevent any noise coupling into the analog signals. 4) keep the high-current paths short, especially at the ground terminals. this practice is essential for stable, jitter-free operation. 5) connect pgnd and agnd together 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. 7) place the bias capacitor ground next to the agnd pin and connect with a short and wide trace. downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q www.maximintegrated.com maxim integrated 14 figure 2. max16956auba/v+ (5.0v fixed) and max16956aubb/v+ (3.3v fixed), 10-pin max figure 3. max16956aubc /v+, variable output voltage, 10-pin max typical application circuits v bat c in1 4.7f c bst 0.1f c out 22f c l 1f c in2 0.1f mode supen reset agnd l 10h v out 3.3v/5v max16956 pgnd nl nh bias out lx bst v bat c in1 4.7f c bst 0.1f c out 22f c l 1f r to p va ries r bot 50k c in2 0.1f mode supen reset agnd l 10h v out 1v/10v max16956 pgnd nl nl bias fb lx bst downloaded from: http:///
max16956 36v, 300ma, mini buck converter with 1.1a i q www.maximintegrated.com maxim integrated 15 package information for the latest package outline information and land patterns (footprints), go to www.maxi minte grated.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. note: insert the desired suffix letter (from the selector guide ) into the blank to indicate the output voltage and spread-spectrum option. /v denotes an automotive qualified part. + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. ordering informationselector guide part temp range pin-package max16956aub_ + -40c to +125c 10 max-ep* max16956aub_ / v+ -40c to +125c 10 max-ep* package type package code outline no. land pattern no. 10 max u10e+3 21-0109 90-0148 part v out reset time (s) spread spectrum pin-package top mark max16956auba+ fixed 5v 10 off 10 max-ep +aabx max16956auba/v+ fixed 5v 10 off 10 max-ep +aabh max16956aubb+ fixed 3.3v 10 off 10 max-ep +aaby max16956aubb/v+ fixed 3.3v 10 off 10 max-ep +aabi max16956aubc+ adjustable 10 off 10 max-ep +aabz max16956aubc/v+ adjustable 10 off 10 max-ep +aabj max16956aubd/v+ fixed 5v 10 on 10 max-ep +aabk max16956aube/v+ fixed 3.3v 10 on 10 max-ep +aabl max16956aubf/v+ adjustable 10 on 10 max-ep +aabm downloaded from: http:///
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. max16956 36v, 300ma, mini buck converter with 1.1a i q ? 2015 maxim integrated products, inc. 16 revision history revision number revision date description pages changed 0 6/13 initial release ? 1 2/14 changed pgnd to agnd for pin 8 in the pin description section, removed c1 from figure 1, and added nonautomotive opns for max16956a, max16956b, and max16956c versions 8, 11, 15 2 3/14 removed future product references 15 3 2/15 updated the benefits and features section 1 4 8/15 updated block diagram 9 5 10/15 added top marks to selector guide 15 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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