A8431EEH-T

更新时间： 2024-02-27 10:42:06

品牌	Logo	应用领域
急速微 - ALLEGRO		转换器驱动升压转换器
页数	文件大小	规格书
10页	331K
描述
White LED Driver Constant Current Step-up Converter

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数据手册

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A8431EEH-T 数据手册

Preliminary Data Sheet

Subject to Change without Notice

December 7, 2004

A8431

White LED Driver Constant Current Step-up Converter

The A8431 is a noninverting boost dc-dc converter that provides a

programmable constant current output up to 32 V for driving white

LEDs in series.The A8431 also offers an OVP (overvoltage protection)

pin. Driving the LEDs in series ensures identical currents and uniform

brightness. Up to four white LEDs can be driven at 20 mA from a single

cell Li-ion or a multicell NiMH power source. Up to two parallel strings

of eight white LEDs can be driven at 20 mA by increasing the supply

voltage up to 10 V.

A8431 MLPD

The A8431 incorporates a power switch and a feedback sense amplifier

to provide a solution with minimum external components. The output

current can be set by adjusting a single external sense resistor and can

be varied with a voltage or a filtered PWM signal when dimming con-

trol is required. The high switching frequency of 1.2 MHz allows the

use of small inductor and capacitor values.

Approximate actual size

The A8431 is provided in a 0.75 mm high, 6-pin, 2 x 3 mm MLP pack-

age. It is lead (Pb) free, with 100% matte tin leadframe plating.

VIN

OVP

GND

FEATURES

_θJA= 50 °C/W, see note 1, page 2

ꢀ

Output voltage up to 32 V (OVP level)

2.5 V to 10 V input

Drives up to 4 LEDs at 20 mA from a 2.5 V supply

Drives up to 5 LEDs at 20 mA from a 3 V supply

1.2 MHz switching frequency

300 mA switch current limit

1 µA shutdown current

ABSOLUTE MAXIMUM RATINGS

OVP pin eliminates the need for an external Zener diode on the output

SW Pin ................................................–0.3 V to 36 V

OVP Pin ..............................................–0.3 V to 36 V

Remaining Pins.................................. –0.3 V to 10 V

Ambient Operating Temperature, T_A....... –40°C to 85°C

Junction Temperature, T_J(max)...............................150°C

Storage Temperature, T_S.................... –55°C to 150°C

APPLICATIONS

ꢀ

LED backlights

Portable battery-powered equipment

Cellular phones

PDAs (Personal Digital Assistant)

Camcorders, personal stereos, MP3 players, cameras

Mobile GPS systems

Use the following complete part numbers when ordering:

Part Number

Package

Description

A8431EEH-T

6-pin, MLPD

Pb-Free, Surface Mount

26185.301

12 3 4 5 6 7...10

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