〇Product structure : Silicon monolithic integrated circuit 〇This product has no designed protection against radioactive rays

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TSZ02201-0J3J0AJ00810-1-2

© 2015 ROHM Co., Ltd. All rights reserved.

27.MAY.2015 Rev.002

TSZ22111 • 14 • 001

www.rohm.com

Figure 1. Typical Application Circuit

2.7V to 5.5V Input ,3A Integrated MOSFET

Single Synchronous Buck DC/DC Converter

BD9B331GWZ

General Description

ROHM’s

high

efficiency

switching

regulator,

BD9B331GWZ, is a step-down converter designed to

produce a low voltage output of 0.6V~3.3V from a

2.7V~5.5V power supply line. It offers high efficiency in

all load ranges by automatic PFM/PWM adjustment. It

employs an On time control system to provide faster

transient response to sudden change in load.

Features



Fast transient response with On time control system.



High efficiency for all load range with synchronous

rectifier (Nch/Nch FET) and adaptive PFM/PWM

system.



Adjustable Soft-start function.



Thermal and UVLO protection.



Short-circuit current protection with pulse count



Shutdown function.

Applications

Power supply for LSI including SoC, DSP,

Micro computer and ASIC



Laptop PC / Tablet PC / Server



LCD TV, Storage Devices (HDD / SSD)



Printer



Amusement



Secondary power supply

Key Specifications



Input Voltage Range:

2.7V to 5.5V



Output Voltage Range:



Output Current:

3.0A (Max)



Switching Frequency:

1.3MHz(Typ)



High Side FET ON Resistance:

23mΩ(Typ)



Low Side FET ON Resistance:

23mΩ(Typ)



Standby Current:

0µA (Typ)



Operating Temperature Range:

-40°C to +85°C

Package(s)

W(Typ) x D(Typ) x H(Max)

UCSP30L1:

1.98mm x 1.80mm x 0.33mm

.

Typical Application Circuit(s)

UCSP30L1

SW

AGND

PVCC

AVCC

EN

L

FB

SS

BST

PGD

PGD

BD9B331GWZ

EN

RES

PGND