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product structure silicon monolithic integrated circuit this product is not designed prot ection against radioactive rays 1/29 tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 14 ? 001 single-chip type with built-in fet switching regulator series step-down switching regulators with built-in power mosfet bu9000xgwz series general description the bu9000xgwz are a high efficiency 6mhz synchronous step-down switching regulator with ultra low current pfm mode. it provides up to 1.0a load current and an input voltage range from 3.0v to 5.5v, optimized for battery powered portable applications. bu9000xgwz has a mode control pin that allows the user to select forced pwm (pulse width modulation) mode or pfm (pulse frequency modulation) and pwm auto change mode utilized powe r save operation at light load current. features ? fast transient response ? automatic pfm/pwm operation ? forced pwm operation ? internal soft start ? under voltage lockout ? over current protection ? thermal shutdown lineup pin configuration(s) applications smart phones, cell phones, portable applications, micro dc/dc modules, and usb accessories package(s) w(typ.) x d(typ.) x h(max.) ucsp35l1 1.30mm x 0.90mm x 0.40mm typical application circuit(s) pin description(s) part no. output voltage input voltage switching frequency operating mode mode=l mode=h bu90002gwz 3.30v 4.0v to 5.5v 5.4mhz to 6.6mhz automatic pfm/pwm forced pwm bu90003gwz 1.20v 2.3v to 5.5v 3.6mhz to 4.4mhz bu90004gwz 1.80v 2.3v to 5.5v 4.8mhz to 6.0mhz bu90005gwz 2.50v 2.3v to 5.5v 5.4mhz to 6.6mhz forced pfm bu90006gwz 3.00v 2.3v to 5.5v 5.4mhz to 6.6mhz automatic pfm/pwm bu90007gwz 1.25v 2.3v to 5.5v 3.6mhz to 4.4mhz bu90008gwz 1.00v 2.3v to 5.5v 3.2mhz to 4.0mhz bu90009gwz 1.30v 2.3v to 5.5v 3.8mhz to 4.8mhz pin no. symbol 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 figure 1. typical application circuit(s) (bottom view) figure 2. pin configuration(s) datashee t downloaded from: http:///
2/29 datasheet datasheet bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 block diagram(s) description of block(s) the bu9000xgwz are a synchronous step-down dc/dc converter t hat achieves fast transient response from light load to heavy load by hysteretic pwm control system and current constant pfm control system. pwm control bu9000xgwz operates by hysteretic pwm c ontrol. this scheme ensures fast switch ing, high efficiency, and fast transient response. when the output voltage is below the vref voltage, the error comparator output is low to high and turning on p-channel mosfet until above the vref voltage and minimum on time. pfm control at light load the regulator and mode=low, the regulator operates with reduced switchi ng frequency and improves the efficiency.during pfm operation, the output voltage slightly higher than typical output voltage. figure 4. operation of pfm mode and pwm mode figure 3. block diagram(s) gnd lx vin en shutdown tsd error comp fb frequency control uvlo vref switching control logic and gate driver mode pwm/pfm control b1 1.5 0.47uh 4.7 10uf vout 2.3 5.5v vout h on l off l pwm/pfm mode h pwm mode a1 b2 a3 a2 b3 en downloaded from: http:///
3/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 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 cu rrent at start-up. typical start up times with a 4.7uf output capacitor is 120usec. 3) current limit the bu9000xgwz has a current limit circui t that protects itself and external components during overload 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 forc ed pwm.this control provides noise reduction and output stability.do not leave the mode pin floating. 6) forced pfm mode ( bu90005gwz) setting mode pin low (<0.4v) places the regulator in forced pfm. it is effective in light load mode. 7) tsd the bu9000xgwz has a thermal shutdown feature to protect the device if the junction temperature exceeds 150 .in thermal shutdown, the driver is disabled. this circuit is only to cut off the ic from thermal runaway, and has not been design to prot ect or guarantee the ic. therefore, the user should not plan to activate this circuit with continued operation in mind. absolute maximum ratings (ta=25 ) (*1) when mounted on the specified pcb (55mm x 63mm), deducted by 3.9m w/c when used over ta=25c recommended operating rating(s) 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 r ange topr -40 to +85 storage temperature range tstg -55 to +125 junction temperature tjmax +125 parameter symbol rating unit serise min. typ. max. input voltage vin 4.0 - 5.5 v bu90002gwz 2.3 - 5.5 bu90003 bu90009gwz downloaded from: http:///
4/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 electrical characteristic(s) (unless otherwise specified vin=3.6v, ta=25 ) item symbol rating unit condition min. typ. max. switching regulator output voltage accuracy vouta -2 - +2 % mode:h(pwm operation) -2 - +3 mode:l(pfm operation) maximum load current 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 ioutmax4 - - 0.1 a mode:l(pfm operation) (bu90005gwz,) soft start soft start time tss 65 120 240 usec ( bu90002gwz, bu90003gwz, bu90004gwz, bu90005gwz, bu90006gwz, bu90007gwz, bu90009gwz ) 55 110 220 usec ( bu90008gwz ) frequency control switching frequency fosc 5.4 6.0 6.6 mhz no load, mode:h ( bu90002gwz,bu90005gwz, bu90006gwz) 4.8 5.4 6.0 mhz no load, mode:h ( bu90004gwz ) 3.6 4.0 4.4 mhz no load, mode:h ( bu90003gwz, bu90007gwz ) 3.2 3.6 4.0 mhz no load, mode:h ( bu90008gwz ) 3.8 4.3 4.8 mhz no load, mode:h ( bu90009gwz ) 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 (bu90005gwz : forced pfm) 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 15 30 60 ohm en=0v, fb=0.5v circuit current operating quiescent current iins1 - 45 65 ua no load, en:h, mode:l, vout=3.6v forced not switching ( bu90003gwz, bu90004gwz, bu90005gwz, bu90007gwz, bu90008gwz, bu90009gwz ) iins2 - 55 80 ua no load, en:h, mode:l, vout=3.6v forced not switching ( bu90002gwz,bu90006gwz ) iq1 - 5.2 - ma no load, en:h, mode:h, pwm operation l:lqm21mpn1r0ng0 ( bu90003gwz ) iq2 - 5.6 - ma no load, en:h, mode:h, pwm operation l:lqm21mpn1r0ng0 ( bu90004gwz ) shutdown current shd - 0 1 ua en=0v downloaded from: http:///
5/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 electrical characteristic curves (reference data) bu90002gwz (3.3v output) parts l:lqm21mpn1r0ng0 (2.0mm 1.6mm 1.0mm murata) cout:grm155r60j475m(1.0mm 0.5mm 0.5mm murata) figure 5. start up figure 7. load transient response 5ma to 50ma tr=tf=100ns, mode : low figure 8. load transient response 50ma to 350ma tr=tf=100ns, mode : low figure 6. shut down vout 2v/div en 2v/div il 500ma/div 20us en 2v/div vout 2v/di v 100us vout 50mv/div ac coupled iout 50ma/di v 10us vout 50mv/div ac coupled iout 200ma/di v 4us downloaded from: http:///
6/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 figure 9. load transient response 150ma to 500ma tr=tf=100ns, mode : high figure 10. pfm mode operation iout=40ma figure 12. mode change response mode : high to low figure 11. pwm mode operation iout=100ma vout 50mv/div ac coupled iout 200ma/div vout 20mv/div ac coupled lx 5v/di v il 500ma/di v il 500ma/div vout 20mv/div ac coupled lx 5v/div mode 2v/di v vout 20mv/div ac coupled il 500ma/div 4us 400ns 80ns 4us downloaded from: http:///
7/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 efficiency[%] load current[ma] . . . . . . . . output voltage[v] load current[ma] vout ripple voltage[mv] load current[ma] figure 13. mode change response mode : low to high figure 14. efficiency vs load current vin=5v pwm/pfm auto mode figure 15. load regulation vin=5v pwm/pfm auto mode figure 16. vout ripple voltage vin=5v pwm/pfm auto mode mode 2v/div vout 20mv/div ac coupled il 500ma/div 4us downloaded from: http:///
8/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 electrical characteristic curves (reference data) bu90003gwz (1.2v output) figure 17. start up figure 18. shut down figure 19. load transient response 5ma to 200ma tr=tf=100ns, mode : low figure 20. load transient response 50ma to 350ma tr=tf=100ns, mode : low en 2v/div vout 500mv/div il 200ma/div vout 500m/div en 2v/div vout 50mv/div 1.2v offset iout 200ma/div vout 50mv/div 1.2v offset iout 200ma/div 40us 100us 4us 10us downloaded from: http:///
9/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 figure 23. fig.23 pwm mode operation iout=100ma figure 24. mode change response mode : high to low figure 21. load transient response 400ma to 1000ma tr=tf=100ns, mode : low figure 22. pfm mode operation iout=50ma iout 500ma/div vout 50mv/div ac coupled lx 2v/div vout 20mv/div ac coupled il 500ma/div lx 2v/div il 500ma/div vout 20mv/div ac coupled mode 2v/div vout 50mv/div ac coupled il 200ma/div 4us 400ns 80ns 2us downloaded from: http:///
10/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 . . . . . output voltage[v] load current[ma] 0.1 1 10 100 1000 efficiency[%] load current[ma] figure 25. mode change response mode : low to high figure 26. efficiency vs load current pwm/pfm auto mode figure 27. load regulation pwm/pfm auto mode il 200ma/div vout 50mv/div ac coupled mode 2v/div 2us vin=2.7v vin=3.6v vin=4.2v vin=4.2 vin=3.6 vin=2.7 downloaded from: http:///
11/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 electrical characteristic curves (reference data) bu90004gwz (1.80v output) figure 28. start up figure 29. shut down figure 30. load transient response 5ma to 200ma tr=tf=100ns, mode : low figure 31. load transient response 50ma to 350ma tr=tf=100ns, mode :low vout 50mv/div ac coupled iout 200ma/div en 5v/div vout 1v/div vout 50mv/div ac coupled iout 200ma/div en 5v/div vout 1v/div il 200ma/div 40us 100us 4us 4us downloaded from: http:///
12/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 figure 32. load transient response 200ma to 600ma tr=tf=100ns, mode : low figure 33. pfm mode operation iiout=50ma figure 34. pwm mode operation iout=100ma figure 35. mode change response mode : high to low mode 5v/div vout 50mv/div ac coupled lx 200ma/div vout 20mv/div ac coupled lx 2v/div vout 50mv/div ac coupled iout 200ma/div vout 20mv/div ac coupled lx 2v/div 4us 80ns 400ns 4us downloaded from: http:///
13/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 0.1 1 10 100 1000 efficiency[%] load current[ma] . . . . . . output voltage[v] load current[ma] figure 36. mode change response mode : low to high figure 38. load regulation pwm/pfm auto mode figure 37. efficiency vs load current pwm/pfm auto mode mode 5v/div vout 50mv/div ac coupled lx 200ma/div 2us vin=2.7v vin=3.6v vin=4.2v vin=2.7v vin=3.6v vin=4.2v downloaded from: http:///
14/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 electrical characteristic curves (reference data) bu90005gwz (2.50v output) figure 39. start up figure 40. shut down figure 41. load transient response 5ma to 100ma tr=tf=100ns, mode : low figure 42. load transient response 50ma to 350ma tr=tf=100ns, mode : high vout 100mv/div ac coupled iout 200ma/div en 2v/div vout 1v/div vout 50mv/div ac coupled iout 100ma/div en 1v/div vout 1v/div il 200ma/div 40us 100us 4us 4us downloaded from: http:///
15/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 figure 43. load transient response 200ma to 600ma tr=tf=100ns, mode : high figure 44. pfm mode operation iout=50ma figure 45. pwm mode operation iout=100ma figure 46. mode change response mode : high to low mode 2v/div vout 50mv/div ac coupled il 200ma/div vout 50mv/div ac coupled lx 2v/div vout 100mv/div ac coupled iout 200ma/div vout 20mv/div ac coupled lx 2v/div 10us 1us 80ns 4us il 500ma/div il 200ma/div downloaded from: http:///
16/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 0.1 1 10 100 1000 efficiency[%] load current[ma] 0.1 1 10 100 efficiency[%] load current[ma] figure 47. mode change response mode : low to high figure 48. efficiency vs load current pfm mode vout 50mv/div ac coupled figure 49. efficiency vs load current pwm mode 4us mode 2v/div il 200ma/div vin=2.7v vin=3.6v vin=4.2v vin=2.7v vin=3.6v vin=4.2v downloaded from: http:///
17/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 electrical characteristic curves (reference data) bu90008gwz (1.000v output) 100us figure 50. start up figure 52. load transient response 5ma to 100ma tr=tf=100ns, mode : low figure 53. load transient response 50ma to 350ma tr=tf=100ns, mode : high figure 51. shut down vout 500 v/div en 2v/div il 200ma/div en 2v/div vout 500mv/di v vout 50mv/div ac coupled iout 200ma/di v 20us vout 50mv/div ac coupled iout 200ma/di v 20us 40us downloaded from: http:///
18/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 figure 54. load transient response 200ma to 600ma tr=tf=100ns, mode : high figure 55. pfm mode operation iout=50ma figure 57. mode change response mode : high to low figure 56. pwm mode operation iout=100ma vout 50mv/div ac coupled iout 500ma/di v vout 20mv/div ac coupled lx 2v/di v il 200ma/div il 200ma/div vout 20mv/div ac coupled lx 2v/di v mode 2v/di v vout 50mv/div ac coupled il 200ma/div 20us 1us 200ns 4us downloaded from: http:///
19/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 figure 58. mode change response mode : low to high figure 59. efficiency vs load current pfm mode figure 60. efficiency vs load current pwm mode mode 2v/div vout 50mv/div ac coupled il 200ma/div 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 0.980 0.990 1.000 1.010 1.020 0 200 400 600 800 1000 output voltage [v] load current[ma] vin=2.7v vin=3.6v vin=4.2v downloaded from: http:///
20/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 electrical characteristic curves (reference data) bu90009gwz (1.300v output) 100us figure 61. start up figure 63. load transient response 5ma to 50ma tr=tf=100ns, mode : low figure 64. load transient response 50ma to 350ma tr=tf=100ns, mode : lo w figure 62. shut down vout 500 v/div en 2v/div il 200ma/div en 2v/div vout 500mv/di v vout 50mv/div ac coupled iout 100ma/di v vout 50mv/div ac coupled iout 200ma/di v 40us 20us 20us downloaded from: http:///
21/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 figure 65. load transient response 150ma to 500ma tr=tf=100ns, mode : high figure 66. pfm mode operation iout=50ma figure 68. mode change response mode : high to low figure 67. pwm mode operation iout=100ma vout 50mv/div ac coupled iout 200ma/di v vout 20mv/div ac coupled il 200ma/div il 200ma/div vout 20mv/div ac coupled mode 2v/div vout 50mv/div ac coupled il 200ma/div 20us 1us 200ns 4us lx 2v/di v lx 2v/di v downloaded from: http:///
22/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 0 10 20 30 40 50 60 70 80 90 100 . efficiency [%] load current [ma] vin=2.7v vin=3.6v vin=4.2v 1.274 1.287 1.300 1.313 1.326 output voltage[v] load current[ma] vin=2.7v vin=3.6v vin=4.2v figure 69. mode change response mode : low to high figure 70. efficiency vs load current pwm/pfm auto mode figure 71. load regulation pwm/pfm auto mode mode 2v/div vout 50mv/div ac coupled il 200ma/div 4us downloaded from: http:///
23/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 pc board layout the suggested pcb layout for the bu9000xgwz are shown in fi gure. the following guidelines should be used to ensure a proper layout. 1) the input capacitor cin should be connect as closely possible to vin pin and gnd pin. 2) from the output voltage to the fb pin line should be as separate as possible. 3) cout and l should be connected as closely as possible. t he connection of l to the lx pin should be as short as possible. figure 72. pcb layout external parts selection inductor selection the inductance significantly depends on output ripple current. as shown by following equation, the ripple current decreases as the inductor and/or sw itching 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 current plus half of the inductor current ripple as shown by the following equation. (vin-vout) vout S i l = l vin f S i l i lpeak = 2 i outmax + downloaded from: http:///
24/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 1 ) recommended inductor selection ? iout Q 1a lqm2mpn1r0ng0 (2.0mm1.6mm1.0mm murata) mipsz2016d1r0fh (2.0mm1.6mm1.0mm fdk) dfe252012c1r0 (2.5mm2.0mm1.2mm toko) ? iout Q 0.6a lqm21pn1r0ngc (2.0mm 1.2mm1.0mm murata) mipsz2012d1r0 (2.0mm1.2mm1.0mm fdk) mipstz1608d1r0 (1.6mm 0.8mm 0.8mm fdk) mlp2012h1r0m (2.0mm1.2mm1.0mm tdk) ckp2012n1r0n (2.0mm1.2mm1.0mm taiyo yuden) 2 ) recommended input capacitor(cin) selection grm155r60j225m(1.0mm 0.5mm 0.5mm murata) grm155r60j475m(1.0mm 0.5mm 0.5mm murata) grm155r60g106m(1.0mm 0.5mm 0.5mm murata) 3 ) recommended output capacitor(cout) selection grm155r60j475m(1.0mm 0.5mm 0.5mm murata) grm155r60g106m(1.0mm 0.5mm 0.5mm murata) cautions on the output capacitor selection the bu9000xgwz is designed to fixed soft-start time and operate with a maximum output capacitance of 10uf. if the capacitance connected to the output is larger than 10uf, an overshoot of the output voltage will be caused. it is possible to cause damage on the connected device. downloaded from: http:///
25/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 i/o equivalence circuit(s) a2 en b1 mode b2 lx b3 fb vin vin vin vin downloaded from: http:///
26/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 caution of use 1) absolute maximum ratings an excess in the absolute maximum rating, such as supply voltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to identify br eaking mode, such as a short circuit or an open circuit. if any over rated values will expect to exceed the absolute ma ximum ratings, consider adding circuit protection devices, such as fuses. 2) gnd voltage the potential of gnd pin must be minimum pot ential in all condition. as an exception, the circuit design 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 margin in light of the power dissipation (pd) in actual 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 there is any connection error or if pi ns are shorted together. 5) actions in strong electromagnetic field use caution when using the ic in the presence of a strong electromagnetic fi eld as doing so may cause the ic to malfunction. 6) mutual impedance power supply and ground wiring should reflect consideration of the need to lower mutual impedance and minimize ripple as much as possible (by making wiring as short and thick as possible or rejecting ripple by incorporating inductance and capacitance). 7) thermal shutdown circuit (tsd circuit) this model ic has a built-in tsd circuit. this circuit is only to cut off the ic from thermal runaway, and has not been design to protect or guarantee the ic. theref ore, the user should not plan to activa te this circuit with continued operation in mind. 8) regarding input pin of the ic this monolithic ic contains p+ isolation and p substrat e layers between adjacent elements in order to keep them isolated. p-n junctions are formed at the intersecti on of these p layers with the n layers of other elements, creating a parasitic diode or transistor. for example, as shown in the figures below, the relation between each potential is 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 parasitic transistor. parasitic diodes can occur inevitable in the structure of the ic. the operation of parasitic diodes can result in mutual interference among circuits, operational faults, or physical damage. accordingly, methods by which parasitic diodes operate, such as applying a voltage that is lower than the gnd (p substrate) voltage to an input pin, should not be used. 9) disturbance light in a device where a portion of silicon is exposed to light such as in a wl-csp, ic characteristics may be affected due to photoelectric effect. for this reason, it is recommended to co me up with countermeasures that will prevent the chip from being exposed to light. status of this document the japanese version of this document is formal specification. a customer may use this translation version only for a reference to help reading the formal version. if there are any differences in translation version of this document formal version takes priority downloaded from: http:///
27/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 ordering information b u 9 0 0 0 x g w z e 2 part number package gwz: ucsp35l1 packaging and forming specification e2: embossed tape and reel (ucsp35l1) marking diagram(s)(top view) series part number marking bu90002gwz ab4 bu90003gwz ab6 bu90004gwz ab7 bu90005gwz ab8 bu90006gwz ab9 bu90007gwz acm bu90008gwz adw bu90009gwz adv downloaded from: http:///
28/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 physical dimension, tape and reel information package name ucsp35l1 < tape and reel information > tape embossed carrier tape quantity 3,000pcs direction of feed e2 the direction is the pin 1 of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand (uit reel direction of feed 1pin 1234 1234 1234 1234 1234 1234 downloaded from: http:///
29/29 datasheet d a t a s h e e t bu9000xgwz series tsz02201-0f2f0ag00010-1-2 ? 2012 rohm co., ltd. all rights reserved. 7.jul.2015 rev.007 www.rohm.com tsz22111 ? 15 ? 001 revision history date revision changes 04.jul.2012 001 new release 16.oct.2013 002 page18 1 ) recommended inductor selection mipsz2016d1r0fh, mipsz2012d1r0 added. 28.oct.2013 003 page4 electrical characteristic(s) operating quiescent current iq1(bu90003gwz pwm operation), iq2(b u90004gwz pwm operation) added. 29.may.2014 004 page19 i/o equivalence circuit added. page20 ? page22 physical dimension, tape and reel information 8.dec.2014 005 page20 caution of use 9) disturbance light added. 15.may.2015 006 bu90008gwz added. page 2 figure 3. block diagram(s) range of the output capacitor capacity added. page21 cautions on the output capacitor selection added. 7.jul.2015 007 bu90009gwz added. page 4 output discharge resistance correction of errors downloaded from: http:///
datasheet d a t a s h e e t notice-pga-e rev.001 ? 2015 rohm co., ltd. all rights reserved. notice precaution on using rohm products 1. our products are designed and manufac tured for application in ordinary elec tronic equipments (such as av equipment, oa equipment, telecommunication equipment, home electroni c appliances, amusement equipment, etc.). if you intend to use our products in devices requiring ex tremely high reliability (such as medical equipment (note 1) , transport equipment, traffic equipment, aircraft/spacecra ft, nuclear power controllers, fuel c ontrollers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (specific applications), please consult with the rohm sale s representative in advance. unless otherwise agreed in writing by rohm in advance, rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ro hms products for specific applications. (note1) medical equipment classification of the specific applications japan usa eu china class class class b class class ? class 2. rohm designs and manufactures its products subject to strict quality control system. however, semiconductor products can fail or malfunction at a certain rate. please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe desi gn against the physical injury, damage to any property, which a failure or malfunction of our products may cause. the following are examples of safety measures: [a] installation of protection circuits or other protective devices to improve system safety [b] installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. our products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditio ns, as exemplified below. accordin gly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of an y rohms products under any special or extraordinary environments or conditions. if you intend to use our products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] use of our products in any types of liquid, incl uding water, oils, chemicals, and organic solvents [b] use of our products outdoors or in places where the products are exposed to direct sunlight or dust [c] use of our products in places where the products ar e exposed to sea wind or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use of our products in places where the products are exposed to static electricity or electromagnetic waves [e] use of our products in proximity to heat-producing components, plastic cords, or other flammable items [f] sealing or coating our products with resin or other coating materials [g] use of our products without cleaning residue of flux (ev en if you use no-clean type fluxes, cleaning residue of flux is recommended); or washing our products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] use of the products in places subject to dew condensation 4. the products are not subjec t to radiation-proof design. 5. please verify and confirm characteristics of the final or mounted products in using the products. 6. in particular, if a transient load (a large amount of load applied in a short per iod of time, such as pulse. is applied, confirmation of performance characteristics after on-boar d mounting is strongly recomm ended. avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading c ondition may negatively affect product performance and reliability. 7. de-rate power dissipation (pd) depending on ambient temper ature (ta). when used in seal ed area, confirm the actual ambient temperature. 8. confirm that operation temperat ure is within the specified range described in the product specification. 9. rohm shall not be in any way responsible or liable for fa ilure induced under deviant condi tion from what is defined in this document. precaution for mounting / circuit board design 1. when a highly active halogenous (chlori ne, bromine, etc.) flux is used, the resi due of flux may negatively affect product performance and reliability. 2. in principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must be used on a through hole mount products. if the flow sol dering method is preferred on a surface-mount products, please consult with the rohm representative in advance. for details, please refer to rohm mounting specification downloaded from: http:///
datasheet d a t a s h e e t notice-pga-e rev.001 ? 2015 rohm co., ltd. all rights reserved. precautions regarding application examples and external circuits 1. if change is made to the constant of an external circuit, pl ease allow a sufficient margin considering variations of the characteristics of the products and external components, including transient characteri stics, as well as static characteristics. 2. you agree that application notes, re ference designs, and associated data and in formation contained in this document are presented only as guidance for products use. theref ore, in case you use such information, you are solely responsible for it and you must exercise your own indepen dent verification and judgment in the use of such information contained in this document. rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take proper caution in your manufacturing process and storage so that voltage exceeding t he products maximum rating will not be applied to products. please take special care under dry condit ion (e.g. grounding of human body / equipment / solder iron, isolation from charged objects, se tting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1. product performance and soldered connections may deteriora te if the products are stor ed in the places where: [a] the products are exposed to sea winds or corros ive gases, including cl2, h2s, nh3, so2, and no2 [b] the temperature or humidity exceeds those recommended by rohm [c] the products are exposed to di rect sunshine or condensation [d] the products are exposed to high electrostatic 2. even under rohm recommended storage c ondition, solderability of products out of recommended storage time period may be degraded. it is strongly recommended to confirm sol derability before using products of which storage time is exceeding the recommended storage time period. 3. store / transport cartons in the co rrect direction, which is indicated on a carton with a symbol. otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. use products within the specified time after opening a humidity barrier bag. baking is required before using products of which storage time is exceeding the recommended storage time period. precaution for product label qr code printed on rohm products label is for rohms internal use only. precaution for disposition when disposing products please dispose them proper ly using an authorized industry waste company. precaution for foreign exchange and foreign trade act since concerned goods might be fallen under listed items of export control prescribed by foreign exchange and foreign trade act, please consult with rohm in case of export. precaution regarding intellectual property rights 1. all information and data including but not limited to application example contained in this document is for reference only. rohm does not warrant that foregoi ng information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. 2. rohm shall not have any obligations where the claims, actions or demands arising from the co mbination of the products with other articles such as components, circuits, systems or external equipment (including software). 3. no license, expressly or implied, is granted hereby under any intellectual property rights or other rights of rohm or any third parties with respect to the products or the informati on contained in this document. pr ovided, however, that rohm will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to manufacture or sell products containing the produc ts, subject to the terms and conditions herein. other precaution 1. this document may not be reprinted or reproduced, in whol e or in part, without prior written consent of rohm. 2. the products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of rohm. 3. in no event shall you use in any wa y whatsoever the products and the related technical information contained in the products or this document for any military purposes, incl uding but not limited to, the development of mass-destruction weapons. 4. the proper names of companies or products described in this document are trademarks or registered trademarks of rohm, its affiliated companies or third parties. downloaded from: http:///
datasheet datasheet notice C we rev.001 ? 201 5 rohm co., ltd. all rights reserved. general precaution 1. before you use our pro ducts, you are requested to care fully read this document and fully understand its contents. rohm shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny rohms products against warning, caution or note contained in this document. 2. all information contained in this docume nt is current as of the issuing date and subj ec t to change without any prior notice. before purchasing or using rohms products, please confirm the la test information with a rohm sale s representative. 3. the information contained in this doc ument is provi ded on an as is basis and rohm does not warrant that all information contained in this document is accurate an d/or error-free. rohm shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. downloaded from: http:///

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