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1/14 www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. single-chip type with built-in fet switching regula tor series output 1.0a high-efficiency step-down switching regulators with built-in power mosfet bu90002gwz, bu90003gwz, bu90004gwz, bu90005gwz, bu9 0006gwz, description the bu9000xgwz are a high efficiency 6mhz synchrono us step-down switching regulator with ultra low cur rent pfm mode. it provides up to 1.0a load current and an input vo ltage range from 3.0v to 5.5v, optimized for batter y powered portable applications. bu9000xgwz has a mode control pin that allows the u ser to select forced pwm(pulse width modulation)mod e or pfm(pulse frequency modulation) and pwm auto change mode utilized power save operation at light load c urrent. features 1) 93% peak efficiency 2) 4 to 6 mhz switching frequency 3) input voltage vin=2.3v to 5.5v(bu90003 bu90006), vin=4.0v to 5.5v (bu90002) 4) 45ua typical quiescent current 5) fast transient response 6) automatic pfm/pwm operation 7) forced pwm operation 8) internal soft start 9) under voltage lockout 10) over current protection 11) thermal shutdown 12) ultra small and low profile wlcsp (1.3mm 0.9mm t=0.40mm max) (ucsp35l1 ) applications cell phones, smart phones, portable applications an d micro dc/dc modules, usb accessories operating range part no. output voltage input voltage bu90002gwz 3.30v 4.0v to 5.5v bu90003gwz 1.20v 2.3v to 5.5v bu90004gwz 1.80v 2.3v to 5.5v bu90005gwz 2.50v 2.3v to 5.5v BU90006GWZ 3.00v 2.3v to 5.5v no.11xxxeatxx
technical note 2/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. absolute maximum ratings (*1) when mounted on the specified pcb (55mm x 63 mm), deducted by 3.9m w/c when used over ta=25c operating conditions ta=25c, vin=3.6v(bu90003gwz BU90006GWZ),vin=5.0v(bu90002gwz) item symbol rating unit condition min. typ. max. switching regulator output voltage accuracy vouta -2 - +2 % mode:h(pwm operation) -2 - +3 mode:l(pwm/pfm operation) ioutmax1 - - 1.0 a 3.0v Q vin 5.5v ioutmax2 - - 0.8 a 2.7v Q vin 3.0v ioutmax3 - - 0.6 a 2.3v Q vin 2.7v soft start soft start time tss 65 120 240 usec frequency control switching frequency fosc 5.4 6.0 6.6 mhz no load bu90002gwz,bu90005gwz BU90006GWZ 4.8 5.4 6.0 mhz no load bu90004gwz 3.6 4.0 4.4 mhz no load bu90003gwz driver pchfet on resistance ronp1 - 250 400 mohm vin=5.0v ronp2 300 450 mohm vin=3.6v nchfet on resistance ronn1 - 220 350 mohm vin=5.0v ronn2 250 380 mohm vin=3.6v control en pin control voltage operation venh 1.4 - vin v non operation venl 0 - 0.4 v mode pin control voltage operation vmodeh 1.4 - vin v forced pwm non operation vmodel 0 - 0.4 v automatic pfm/pwm uvlo protect threshold voltage uvth 1.95 2.05 2.15 v hysteresis uvhy 50 100 150 mv current limit current limit threshold ilimit 1.5 1.7 1.9 a pmos current detect, open loop output discharge output discharge resistance dres 55 110 220 ohm en=0v circuit current operating quiescent current iins - 45 65 ua en:h, mode:l, vout=3.6v forced not switching shutdown current shd - 0 1 ua en=0v no design for durability against radiation parameter symbol rating unit maximum input power supply voltage vin 7 v maximum voltage at en, fb, lx, mode ven, vfb, vlx, vmode 7 v power dissipation pd 0.39(*1) w operating temperature range topr -40 +85 storage temperature range tstg -55 +125 junction temperature tjmax +125
technical note 3/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. electrical characteristic curves (reference data) l:lqm21mpn1r0ng0 (2.0mm 1.6mm 1.0mm murata) cout:grm155r60j475m(1.0mm 0.5mm 0.5mm murata) bu90002gwz 3.3v output fig.1 start up 20us vout 2v/div en 2v/div il 500ma/div fig.2 shut down 100us en 2v/div vout 1v/div fig.3 load transient response 5ma to 50ma tr=tf=100ns, mode :low 10us vout 50mv/div ac coupled iout 50ma/div 4us vout 50mv/div ac coupled iout 200ma/div fig.4 load transient response 50ma to 350ma tr=tf=100ns, mode :low fig.5 load transient response 150ma to 500ma tr=tf=100ns, mode :high 4us vout 50mv/div ac coupled iout 200ma/div fig.6 pfm mode operation iout=40ma 400ns vout 20mv/div ac coupled lx 5v/div il 500ma/div
technical note 4/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. 4us 4us electrical characteristic curves (reference data) C continued bu90002gwz 3.3v output fig.8 mode change response mode high to low fig.9 mode change response mode low to high fig.10 efficiency vs load current vin=5v pwm/pfm auto mode fig.11 load regulation vin=5v pwm/pfm auto mode 3.31 3.32 3.33 3.34 3.35 3.36 3.37 3.38 0 200 400 600 800 1000 load current[ma] output voltage[v] load current[ma] efficiency[%] 60 65 70 75 80 85 90 95 100 1 10 100 1000 fig.12 vout ripple voltage vin=5v pwm/pfm auto mode 0 5 10 15 20 25 30 0 200 400 600 800 1000 load current[ma] vout ripple voltage[mv] fig.7 pfm mode operation iout=100ma il 500ma/div vout 20mv/div ac coupled 80ns lx 5v/div mode 1v/div vout 20mv/div ac coupled lx 500ma/div mode 2v/div vout 20mv/div ac coupled lx 500ma/div
technical note 5/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. electrical characteristic curves (reference data) bu90003gwz(1.2v output) 40us en 2v/div vout 500mv/div il 200ma/div fig.13 start up 100us vout 1v/div en 2v/div fig.14 shut down 4us vout 50mv/div 1.2v offset iout 200ma/div fig.15 load transient response 5ma to 200ma tr=tf=100ns, mode :low 10us vout 50mv/div 1.2v offset iout 200ma/div fig.16 load transient response 50ma to 350ma tr=tf=100ns, mode :low 4us iout 500ma/div vout 50mv/div ac coupled fig.17 load transient response 400ma to 1000ma tr=tf=100ns, mode :low 400ns lx 2v/div vout 20mv/div ac coupled il 500ma/div fig.18 pfm mode operation iout=50ma
technical note 6/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. 2us 2us 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 efficiency[%] load current[ma] vin=2.7v vin=3.6v vin=4.2v 1.176 1.188 1.2 1.212 1.224 1 10 100 1000 vout[v] iout[ma] vin=2.7v vin=3.6v vin=4.2v electrical characteristic curves (reference data) C continued bu90003gwz(1.2v output) fig.21 mode change response mode low to high fig.19 pwm mode operation iout=100ma 80ns lx 2v/div il 500ma/div vout 50mv/div ac coupled fig.20 mode change response mode high to low fig.22 efficiency vs load current vin=3.6v pwm/pfm auto mode fig.23 load regulation pwm/pfm auto mode mode 2v/div vout 50mv/div ac coupled lx 200ma/div lx 200ma/div vout 50mv/div ac coupled mode 2v/div
technical note 7/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. 4us 400ns 4us 4us 40us 100us electrical characteristic curves (reference data) bu90004gwz(1.80v output) fig.24 start up fig.25 shut down fig. 26 load transient response 5ma to 200ma tr=tf=100ns, mode :low fig.27 load transient response 50ma to 350ma tr=tf=100ns, mode :low fig.28 load transient response 200ma to 600ma tr=tf=100ns, mode :low fig.29 pfm mode operation iout=50ma vout 50mv/div ac coupled lx 2v/div vout 50mv/div ac coupled iout 200ma/div vout 50mv/div ac coupled iout 200ma/div vout 50mv/div ac coupled iout 200ma/div en 5v/div vout 1v/div il 200ma/div en 5v/div vout 1v/div
technical note 8/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. 2us 4us 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 efficiency[%] load current[ma] vin=2.7v vin=3.6v vin=4.2v 1.764 1.782 1.8 1.818 1.836 0.1 1 10 100 1000 vout[v] load current[ma] vin=3.6v vin=2.7v vin=4.2v electrical characteristic curves (reference data) C continued bu90004gwz(1.80v output) fig.30 pwm mode operation iout=100ma fig.31 mode change response mode high to low fig.32 mode change response mode low to high fig.34 load regulation pwm/pfm auto mode fig.33 efficiency vs load current vin=3.6v pwm/pfm auto mode vout 20mv/div ac coupled lx 2v/div 80ns mode 5v/div vout 50mv/div ac coupled lx 200ma/div mode 5v/div vout 50mv/div ac coupled lx 200ma/div
technical note 9/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. gnd lx vin en + - shutdown tsd error comp fb frequency control uvlo vref switching control logic and gate driver mode pwm/pfm control b1 1.50.47uh 4.7uf vout 2.35.5v vout h on l off l pwm/pfm mode h pwm mode a1 b2 a3 a2 b3 en block diagram /application circuit external dimensions pin no. name function a1 vin power supply input pin a2 en enable pin a3 gnd gnd pin b1 mode forced pwm mode pin b2 lx inductor connection pin b3 fb feedback voltage input pin b1 mode b2 lx b3 fb a1 vin a2 en a3 gnd pin layout (bottom view) pin number/name/functions
technical note 10/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. functional descriptions the bu9000xgwz are a synchronous step-down dc/dc co nverter that achieves fast transient response from light load to heavy load by hysteretic pwm control system and cur rent constant pfm control system. pwm control bu9000xgwz operates by hysteretic pwm control. this scheme ensures fast switching, high efficiency, an d fast transient response. when the output voltage is below the vref voltage, the error comparator output is low to high and turn ing on p-channel mosfet until above the vref voltage and minimum on time. pfm control at light load the regulator and mode=low, the regul ator operates with reduced switching frequency and improves the efficiency. during pfm operation, the output voltage slightly h igher than typical output voltage. fig. operation of pfm mode and pwm mode pfm (constant current)threshold. turn off pch fet output pwm mode voltage pfm mode at light load pfm threshold. turn on pfet pwm mode at moderate to heavy loads
technical note 11/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. description of operations 1) shutdown if the en input pin set to low (<0.4v), all circuit are shut down and the regulator is standby mode. do not leave the en pin floating. 2) soft start function the regulator has a soft start circuit that reduces in-rush current at start-up. typical start up time s with a 4.7uf output capacitor is 120usec. 3) current limit the bu9000xgwz has a current limit circuit that pro tects itself and external components during overloa d condition. 4) uvlo the bu9000xgwz has a under voltage lock out circuit that turn off device when vin>2.05v(typ.) 5) forced pwm mode setting mode pin high (>1.4v) places the regulator in forced pwm. 6) tsd the bu9000xgwz has a thermal shutdown feature to pr otect the device if the junction temperature exceed s 150 .in thermal shutdown, the driver is disabled.
technical note 12/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. pc board layout the suggested pcb layout for the bu9000xgwz are sho wn in figure. the following guidelines should be us ed to ensure a proper layout. 1) the input capacitor cin should be connect as clo sely possible to vin pin and gnd pin. 2) from the output voltage to the fb pin line shoul d be as separate as possible. 3) cout and l should be connected as closely as pos sible. the connection of l to the lx pin should be as short as possible. fig. pcb layout external parts selection 1) inductor selection the inductance significantly depends on output ripp le current. as shown by following equation, the rip ple current decreases as the inductor and/or switching frequency increase. f: switching frequency l: inductance S i l : inductor current ripple as a minimum requirement, the dc current rating of the inductor should be equal to the maximum load cu rrent plus half of the inductor current ripple as shown by the following e quation. recommended inductor selection lqm21mpn1r0ng0 (2.0mm 1.6mm 1.0mm murata) iout Q 1a lqm21pn1r0ngc (2.0mm 1.2mm 1.0mm murata) iout Q 0.6a 2)recommended input capacitor(cin) selection grm155r60j225m(1.0mm 0.5mm 0.5mm murata) grm188r60j475me84(1.6mm 0.8mm 0.8mm murtata) 3)recommended output capacitor(cout) selection grm155r60j475m(1.0mm 0.5mm 0.5mm murata) grm155r60g106me44(1.0mm 0.5mm 0.5mm murata) grm188r60j475me84(1.6mm 0.8mm 0.8mm murtata) (vin-vout) vout S i l = l vin f S i l i lpeak = 2 i outmax +
technical note 13/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. caution of use 1) absolute maximum ratings an excess in the absolute maximum rating, such as s upply voltage, temperature range of operating condi tions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. if any over rated values will expect to ex ceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses. 2) gnd voltage the potential of gnd pin must be minimum potential in all condition. as an exception, the circuit desi gn allows voltages up to -0.3 v to be applied to the ic pin. 3) thermal design use a thermal design that allows for a sufficient m argin in light of the power dissipation (pd) in act ual operating conditions. 4) inter-pin shorts and mounting errors use caution when positioning the ic for mounting on printed circuit boards. the ic may be damaged if t here is any connection error or if pins are shorted together. 5) actions in strong electromagnetic field use caution when using the ic in the presence of a strong electromagnetic field as doing so may cause the ic to malfunction. 6) mutual impedance power supply and ground wiring should reflect consi deration of the need to lower mutual impedance and minimize ripple as much as possible (by making wiring as sho rt and thick as possible or rejecting ripple by inc orporating inductance and capacitance). 7) thermal shutdown circuit (tsd circuit) this model ic has a built-in tsd circuit. this circ uit is only to cut off the ic from thermal runaway, and has not been design to protect or guarantee the ic. therefore, t he user should not plan to activate this circuit wi th continued operation in mind. 8) regarding input pin of the ic this monolithic ic contains p+ isolation and p subs trate layers between adjacent elements in order to keep them isolated. p-n junctions are formed at the intersection of the se p layers with the n layers of other elements, cr eating a parasitic diode or transistor. for example, as shown in the f igures below, the relation between each potential i s as follows: when gnd > pin a and gnd > pin b, the p-n junction operates as a parasitic diode. when gnd > pin b, the p-n junction operates as a pa rasitic transistor. parasitic diodes can occur inevitable in the struct ure of the ic. the operation of parasitic diodes ca n result in mutual interference among circuits, operational faults, or physical damage. accordingly, methods by which par asitic diodes operate, such as applying a voltage that is lower t han the gnd (p substrate) voltage to an input pin, should not be used.
technical note 14/14 b u900 02gwz, b u90003gwz, b u90004gwz, b u90005gwz, b u90006gwz www.rohm.com target spec. ver.1. 7 ? 2011 rohm co., ltd. all rights reserved. ordering part number tbd

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