bd60910gu ROHM Co. Ltd., bd60910gu Datasheet

bd60910gu

Manufacturer Part Number

bd60910gu

Description

8-lamp Backlight Led Driver With Dimming Function For Mobile Phones

Manufacturer

ROHM Co. Ltd.

Datasheet

1.BD60910GU.pdf (1 pages)

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8-lamp Backlight LED Driver with Dimming Function

for Mobile Phones

BD60910GU

During PWM drive step-up voltage

fluctuations are minimized by the

external capacitor, preventing ringing

noise.

The industry’s first 8-lamp serial drive design and automatic dimming functionality

simplifies application while contributing to lower power consumption.

Supports both log / linear output from an ambient light sensor, facilitating

design.

Specifications

The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the

specifications, which can be obtained from ROHM upon request.Great care was taken in ensuring the accuracy of the information specified in this document. However,

should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage.The technical information

specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any li-

cense to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the

use of such technical information.If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and

the Foreign Trade Law, you will be required to obtain a license or permit under the Law.

BD60910GU

Block Diagram

www. rohm. com

Ambient

Light

Sensor

Capacitor reduces noise

8-lamp serial drive

Compatible with log / linear ambient light

sensor output

BD60910GU

PWM

Part No.

Converter

Dimmer

Interface

A/D

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Control

Supply Voltage

2.7 to 5.5

(V)

Dimming Control

Dimming based

on ambient light

Chopper Control

Automatic

Block

Connection

Serial

LED

Automatic 8bit (256 steps, 0.1mA

increments) LED current adjustment

minimizes flickering and prevents eye

strain.

Error Amp

Automatic 8bit LED current

adjustment

Constant Current

Dimming based

on image

Chopper

Driver

Circuit

Boost

Double-dimming functionality and

the industry’s first 8-lamp LED drive capability

ensure lower power consumption

Product Outline

ROHM’s new BD60910GU LED driver was designed to drive up to 8 LEDs in series - the most in the industry -

with dual dimming functionality. Automatic dimming is performed in real time based on image brightness and

ambient conditions, preventing eye strain while conserving energy. In addition, 256-level current adjustment

capability results in both lower power consumption and flicker-free operation.

Dimmer

The content specified in this document is correct as of 10th February, 2009.

No. of LEDs

8-lamp

Serial

Constant

Current

Drive

PWM signal /

Max. 25.6mA 128-Step Current DAC

Automatic ambient sensor gain control switching

simplifies design considerably.

Ideal for use with ROHM’s BH1621FVC ambient

sensor IC.

Smart phones, PDAs, MIDs (Mobile Internet Devices), and

other compact and medium-sized LCD-equipped portable

devices.

Dimming is performed based on image brightness and ambient conditions,

reducing power consumption - particularly in portable equipment.

Dimming

Applications

Backlight brightens

Supports ambient sensor gain switching

(Linear input)

Double dimming function

Bright

Dimming

Dimming based on

ambient light

Easy to see

Backlight darkens

Dark

TEL : +81-75-311-2121 FAX : +81-75-315-0172

Reduces

eye strain

21 Saiin Mizosaki-cho, Ukyo-ku,

Dimming

Image Signal

Interface

Control

C Bus

Darker

Kyoto 615-8585 Japan

Backlight

Darkens

New Product Bulletin

www.rohm.com

Dimming based on image

brightness

(3.0x3.0mm, t=1.0 Max.)

VCSP85H3

BH1621FVC

Ambient Light

Sensor IC

Image Signal

Package

Brighter

(mm)

Backlight

Brightens

Energy

Saving

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