Datasheet > AL3157

AL3157

更新时间： 2024-11-06 12:50:07

品牌	Logo	应用领域
美台 - DIODES		驱动器功效泵
页数	文件大小	规格书
9页	309K
描述
HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING

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中文翻译

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AL3157 数据手册

AL3157

HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER

FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT

Description

Pin Assignments

The AL3157 is a low noise, constant frequency charge

pump DC/DC converter that uses a Dual mode load switch

(1x), and doubling (2x) conversion for driving white LEDs.

Low external part count (one 1µF flying capacitor and two

2.2µF capacitors at V_INand V_OUT) make this part ideally

suited for small, battery-powered applications

The AL3157 drives 3 channels at up to 30mA for small

screen backlighting and an additional channel up to 210mA

for LED Flash or LED Flashlight – All from a 2.7V to 5.5V

input.

The AL3157 uses two control inputs (EN1/2) to

enable/disable it and PWM dim the LED current. EN2

controls/PWM dims the backlight LEDs at 30mA per

channel and EN1 controls/PWM dims the Flash/Flashlight

LEDs at 210mA.

( Top View )

EN2

EN1

PGND

C_N

Exposed Pad

V_IN

GND

C_P

V_OUT

U-DFN3030-12

Each output is equipped with built-in protection for V_OUT

short circuit and auto-disable for LED failure conditions.

Built-in soft-start circuitry prevents excessive in-rush

current during start-up and mode switching. A low-current

shutdown feature disconnects the load from V_INto reduce

quiescent current less than 1µA.

The AL3157 is available in a lead-free, space-saving

thermally enhanced 12-pin 3x3mm DFN package.

Features

Applications

•

Dual-Mode 1x and 2x Charge Pump

Up to 300mA drive capability

•

Smart Touch Phone LED Backlighting

PDA White LED backlighting

Backlighting + Torch light

3-channel for backlight – 30mA/ch

1-channel for Flight/light – 210mA

•

V_INRange: 2.7V to 5.5V

Two simple PWM dimming control inputs up to

50kHz

•

1.2 MHz Constant Switching Frequency

Built-In Thermal, Open-Circuit and V_OUTshort circuit

Protection

•

Soft Start for reducing in-rush current

I_Q<1µA in Shutdown

Thermally-Enhanced DFN3030-12 Package:

Available in “Green” Molding Compound (No Br, Sb)

•

Lead Free Finish/ RoHS Compliant (Note 1)

Notes:

1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html

Typical Application Circuit

Flash/

Light

(EN1)

Backlight

(EN2)

V_IN

2.2µF

C_IN

V_IN

V_OUT

2.2µF

C_OUT

C_P

C_N

1µF

C₁

AL3157

EN1

EN2

EN1

EN2

PGND

GND

1 of 9

www.diodes.com

March 2011

AL3157

Document number: DS35116 Rev. 1 - 2

12 3 4 5 6 7...9

中文翻译

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与AL3157相关器件

型号	品牌	获取价格	描述	数据表
AL3157F-7	DIODES	获取价格	HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING
AL3158	DIODES	获取价格	HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS
AL3158_11	DIODES	获取价格	HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS
AL3158FSG	DIODES	获取价格	HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS
AL3158FSG-7	DIODES	获取价格	HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS
AL3159	DIODES	获取价格	HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS
AL3159_11	DIODES	获取价格	HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS
AL3159FSG	DIODES	获取价格	HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS
AL3159FSG-7	DIODES	获取价格	HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS
AL317CS	MOLEX	获取价格	Rectangular Connector Adapter, 31 Contacts(Side1), 31 Contacts(Side2), Panel Mount, Female

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