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2009.03 - Rev.A

○

c

2009 ROHM Co., Ltd. All rights reserved.

Large Current External FET Controller Type Switching Regulators

Step-up/down, High-efficiency

Switching Regulators (Controller type)

BD8303MUV

● General Description

ROHM’s highly-efficient step-up/down switching regulator BD8303MUV generates step-up/down output including 3.3 V / 5 V

from 1 cell of lithium battery, 4 batteries, or 2 cells of Li batteries with just one inductor.

This IC adopts an original step-up/down drive system and creates a higher efficient power supply than conventional

Sepic-system or H-bridge system switching regulators.

● Features

1)Highly-efficient step-up/down DC/DC converter to be constructed just with one inductor.

2) Supports a wide range of power supply voltage range (input voltage: 2.7 V - 14.0 V)

3) Supports high-current application with external Nch FET.

4) Incorporates soft-start function.

5) Incorporates timer latch system short protecting function.

6) High heat radiation surface mounted package QFN16 pin, 3 mm × 3 mm

● Application

General portable equipment like DVC, single-lens reflex cameras, portable DVDs, or mobile PCs

● Absolute Maximum Ratings

When installed on a 70.0 mm × 70.0 mm × 1.6 mm glass epoxy board. The rating is reduced by 4.96 mW/°C at Ta = 25°C or more.

● Operating Conditions (Ta = 25°C)

Parameter

Symbol

Standard value

Unit

MIN

TYP

MAX

Power supply voltage

VCC

2.7

－

14

V

Output voltage

VOUT

1.8

－

12

V

Oscillation frequency

fosc

0.2

0.6

1.0

MHz

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

Parameter

Symbol

Rating

Unit

Maximum applied power voltage

VCC

15

V

VREG

7

V

Between BOOT

1, 2 and SW 1, 2

7

V

Between BOOT

1, 2 and GND

20

V

SW1, 2

15

V

Power dissipation

Pd

620

mW

Operating temperature range

Topr

－

25 to +85

°C

Storage temperature range

Tstg

－

55 to +150

°C

Junction temperature

Tjmax

+150

°C

No.09028EAT02