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○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays

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TSZ02201-0F1F0C100260-1-2

27.Feb.2015 Rev.004

www.rohm.com

TSZ22111・14・001

LED Drivers for LCD Backlights

White LED Diver for

Backlight of Medium/Large-sized LCDs

BD9271KUT

General Description

BD9271KUT is a white LED diver used on backlight of

Medium/Large-sized LCDs. This IC can achieve

dimming function by SPI control. And through the SPI

correspondence, it can set the ON/OFF of each switch,

analog dimming and etc. The signals of PWM dimming

can set the frequency, ON time and delay of PWM by

inputting the external signals to the register.

BD9271KUT has equipped several protection functions

to deal with the abnormal states, including LED OPEN

protection, LED SHORT protection, external current

setting resistance SHORT protection, external MOS

transistor SHORT protection, etc. So it can be used in a

wide output voltage range and various load conditions.

Key Specifications

■ VCC power supply range： 9.0V～35.0V

■ DVDD power supply range： 3.0V～3.6V

■ CLK frequency setting range： 100～10000kHz

■ Operating Circuit current range： 2.4mA(typ.)

■ Operating temperature range： -40℃～+85℃

Applications

TV, PC display

Other LCD backlight

Features

■ 16-ch constant current driver (external FET(NMOS）is

equipped.)

■ LED voltage can be set externally.

■ PWM dimming and Analogue dimming can be

controlled by SPI.

■ LED Abnormal operation detection circuit (OPEN

protection/ SHORT protection) is equipped.

■ LED SHORT protection detection voltage is adjustable

(LSP terminal)

■ LED SHORT protection detection CH

■ FAIL INDICATION function is equipped by ERR_DET

terminal.

■ 3 lines serial interface

■ Package: TQFP64UM

Package W(Typ.) D(Typ.) H(Max.)

TQFP64UM 9.00mm×9.00mm×1.20mm

Pin Pitch 0.4mm

Typical Application Circuit

Figure 1. TQFP64UM

ure 2. T

ical A

lication Circuit

1 2 3 4 5 6 ... 36 37

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Datasheet ○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays 1/34 TSZ02201-0F

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Strany 10 - BD9271KUT

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Strany 27 - Application of BD9271KUT

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Strany 33 - Package Name TQFP64UM

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Strany 37 - DatasheetDatasheet

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