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www.rohm.com

2011.06 - Rev.B

© 2011 ROHM Co., Ltd. All rights reserved.

LED Drivers for LCD Backlights

Backlight LED Driver

for Small LCD Panels (Charge Pump Type)

BD82103GWL

●

Description

BD82103GWL is charge pump type 2 light or 3 light parallel LED driver for the portable instruments.

This IC not only ensures efficient boost by automatically changing the boost rate but also works as a constant current driver

in 16 steps, so that the driving current can be adjusted finely. This IC is best suited to turn on white LEDs that require

high-accuracy LED brightness control.

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Features

1) 2light or 3light parallel LED driver is mounted

2) 16-step LED current adjust function

3) Inter-LED relative current accuracy: 5% or less

4) Driving control via a single-line digital control interface

5) Automatic transition charge pump type DC/DC converter (×1,×1.5, x2)

6) High efficiency achieved (Maximum over 93%)

7) It transits for the most suitable power operating by the LED terminal process

of the 3rd light when 2 light driving

8) Various protection functions such as output voltage protection and thermal shutdown circuit are mounted.

9) Package : UCSP50L1 (Thick 0.55mm MAX, Pin pitch 0.4mm) CSP11pin package

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Absolute Maximum Ratings (Ta=25℃)

Parameter

Symbol

Ratings

Unit

Power supply voltage

VMAX

7

V

Input voltage ( EN )

Vdin

GND-0.3 ~ VBAT+0.3

V

Power dissipation

Pd

730

mW

Operating temperature range

Topr

-30 ~ +85

℃

Storage temperature range

Tstg

-55 ~ +150

℃

Note 1) The measurement value which was mounted on the PCB by ROHM.

When a glass epoxy substrate (70mm × 70mm × 1.6mm) has been mounted, this loss will decrease

5.84mW/℃ if Ta is higher than or equal to 25℃.

●

Operating Conditions (Ta = -30 ~ 85 ℃)

Parameter

Symbol

Ratings

Unit

Operating power supply voltage

VBAT

2.7 ~ 5.5

V

*This chip is not designed to protect itself against radioactive rays.

*This material may be changed on its way to designing.

*This material is not the official specification.

No.11040EBT34