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2009.04- Rev.B

© 2009 ROHM Co., Ltd. All rights reserved.

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

BD8312HFN



Description

ROHM’s Output 1.5A or Less High-efficiency Step-down Switching Regulator with Built-in Power MOSFET BD8312HFN

produces step-down output including 1.2, 1.8, 3.3, or 5 V from 4 batteries, batteries such as Li2cell or Li3cell, etc. or a 5V/12V

fixed power supply line.

This IC allows easy production of small power supply by a wide range of external constants, and is equipped with an external

coil/capacitor downsized by high frequency operation of 1.5 MHz, built-in synchronous rectification SW capable of

withstanding 15 V, and flexible phase compensation system on board.



Features

1) Incorporates Pch/Nch synchronous rectification SW capable of withstanding 1.0 A/15V.

2) Incorporates phase compensation device between input and output of Error AMP.

3) Small coils and capacitors to be used by high frequency operation of 1.5MHz

4) Input voltage 3.5 V – 14 V

Output current 1.2 – 12 V 800mA

5) Incorporates soft-start function.

6) Incorporates timer latch system short protecting function.

7) As small as 2.9mm×3 mm, SON 8-pin package

HSON8



Application

For portable equipment like DSC/DVC powered by 4 dry batteries or Li2cell and Li3cell, or general consumer-equipment

with 5 V/12 V lines



Operating Conditions (Ta = 25℃)

Parameter

Symbol

Voltage circuit

Unit

Power supply voltage

VCC

3.5 to 14

V

Output voltage

VOUT

1.2 to 12

V



Absolute Maximum Ratings

Parameter

Symbol

Rating

Unit

Maximum applied power voltage

VCC, PVCC

15

V

Maximum input current

Iinmax

1.0

A

Power dissipation

Pd

630

mW

Operating temperature range

Topr

－

25 to +85

℃

Storage temperature range

Tstg

－

55 to +150

℃

Junction temperature

Tjmax

+150

℃

*1 When used at Ta = 25℃ or more installed on a 70×70×1.6

* These specifications are subject to change without advance notice for modifications and other reasons.

No.09027EBT04