Single-chip Type with Built-in FET Switching Regulator Series Output 1.5A or Less High Efficiency Step-down Switching Regulator with Built-in Power MOSFET No.09027EBT11 BD9151MUV Description ROHMs high efficiency dual step-down switching regulator BD9151MUV is a power supply designed to produce a low voltage including 1.8 volts or 1.2 volts from 2.8 volts to 5.0 volts power supply line. Reset circuits of input power supply voltage and external Pch MOSFET gate controller are incorporated. Offers high efficiency with our original pulse skip control technology and synchronous rectifier. Employs a current mode control system to provide faster transient response to sudden change in load. Features 1) Offers fast transient response with current mode PWM control system. TM 2) Offers highly efficiency for all load range with synchronous rectifier (Pch/Nch FET) and SLLM (Simple Light Load Mode) 3) Incorporates soft-start function. 4) Incorporates Thermal / ULVO protection functions. 5) Incorporates thermal protection and short-current protection circuit with timer latch function 6) Incorporates shutdown function Icc=0A(Typ.) 7) Incorporates reset function 8) Incorporates Pch MOSFET gate controller 9) Employs small surface mount package : VQFN020V4040 Applications Power supply for LSI including DSP, Micro computer and ASIC Absolute maximum ratings (Ta=25) Parameter Symbol Limit Unit *1 AVCC -0.3+7 V Vcc Voltage *1 PVcc -0.3+7 V EN Voltage VEN -0.3+7 V VSW1 -0.3+7 V SW Voltage VSW2 -0.3+7 V *2 Pd1 0.34 W *3 Pd2 0.70 W Power Dissipation *4 Pd3 2.21 W *5 Pd4 3.56 W Operating Temperature Range Topr -40+85 Storage Temperature Range Tstg -55+150 Maximum Junction Temperature Tjmax +150 *1 Pd, ASO and Tj=150 should not be exceeded. *2 IC only 2 *3 1-layer. mounted on a 74.2mm74.2mm1.6mm glass-epoxy board, occupied area by copper foil : 10.29mm 2 2 *4 4-layer. mounted on a 74.2mm74.2mm1.6mm glass-epoxy board, occupied area by copper foil : 10.29mm , 2-3 layers 5505 mm 2 *5 4-layer. mounted on a 74.2mm74.2mm1.6mm glass-epoxy board, occupied area by copper foil : 5505mm , in each layers Operating conditions (Ta=-40+85) Parameter Symbol Min. Typ. Max. Unit Vcc Voltage AVCCPVCC 2.8 3.3 5.5 V EN Voltage VEN 0 - 5.5 V *6 ISW1 - - 0.4 A SW Average Output Current *6 ISW2 - - 0.8 A *6 Pd and ASO should not be exceeded. www.rohm.com 2009.09 - Rev.B 1/16 2009 ROHM Co., Ltd. All rights reserved. Technical Note BD9151MUV Electrical Characteristics (Unless otherwise noted, Ta=25, AVCC=PVCC=3.3V, EN=AVCC) Limit Parameter Symbol Unit Conditions MIN. TYP. MAX Standby Current ISTB - 0 10 A EN=0V Bias Current ICC - 400 800 A EN Low Voltage VENL - GND 0.8 V In standby mode EN High Voltage VENH 2 Vcc - V In active mode EN Input Current IEN - 1 10 A VEN=2V Oscillation Frequency FOSC 0.8 1.0 1.2 MHz RONP1 - 0.27 0.46 AVCC = PVCC =3.3V Pch FET ON Resistance RONP2 - 0.18 0.30 AVCC = PVCC =3.3V RONN1 - 0.27 0.46 AVCC = PVCC =3.3V Nch FET ON Resistance RONN2 - 0.18 0.30 AVCC = PVCC =3.3V ITH Sink Current 1 ITHSI1 10 20 - A VFB1=2.0V ITH Source Current 1 ITHSO1 10 20 - A VFB 1=1.6V ITH Sink Current 2 ITHSI2 10 20 - A VFB 2=1.4V ITH Source Current 2 ITHSO2 10 20 - A VFB 2=1.0V FB Reference Voltage 1 FB1 1.773 1.800 1.827 V 1.5% FB Reference Voltage 2 FB2 1.182 1.200 1.218 V 1.5% UVLO Threshold Voltage VUVLOL 2.4 2.5 2.6 V AVCC =3.30V UVLO Release Voltage VUVLOH 2.45 2.6 2.8 V AVCC =03.3V Reset Threshold Voltage PG1 2.74 2.87 3.00 V AVCC =3.3V0V Reset Release Voltage PG2 2.84 2.97 3.10 V AVCC =0V3.3V Reset ON resistance RONPG - 140 240 Reset Delay TPG 8 16 32 ms MONI Discharge Resistance RMONI - 110 190 AVCC =3.3V PGATEB Sink Current IPGATEB 1.5 4 6.5 uA Soft start time TSS 0.25 0.5 1.0 ms Timer latch time TLATCH 0.5 1.0 2.0 ms In SCP/TSD operation VSCP1 - 0.9 1.26 V FB1=1.80V Output Short circuit Threshold Voltage VSCP2 - 0.6 0.84 V FB2=1.20V Top View 4.00.1 D9151 Lot No. S 0.08 S 2.10.1 C0.2 15 20 6 16 10 15 11 1.0 +0.05 0.25 0.5 -0.04 VQFN020V4040 (Unit :mm) Fig.1 BD9151MUV TOP View www.rohm.com 2009.09 - Rev.B 2/16 2009 ROHM Co., Ltd. All rights reserved. 0.40.1 1.0Max. 4.00.1 +0.03 0.02 -0.02 2.10.1 (0.22)