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FAN5340UCX

更新时间： 2024-01-10 22:03:11

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		驱动器
页数	文件大小	规格书
12页	931K
描述
Synchronous Constant-Current Series Boost LED Driver with PWM Brightness Control and Integrated Load Disconnect

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FAN5340UCX 数据手册

April 2010

FAN5340

Synchronous Constant-Current Series Boost LED Driver

with PWM Brightness Control and Integrated Load

Disconnect

Features

Description

The FAN5340 is a synchronous constant-current LED driver

capable of efficiently delivering up to 500mW to a string of up

to four LEDs in series. Optimized for small form-factor

applications, the 1.2MHz fixed switching frequency allows

the use of chip inductors and capacitors.

Synchronous Current-Mode Boost Converter

Up to 500mW Output Power

Supports 2, 3, or 4 LEDs in Series

2.7V to 4.8V Input Voltage Range

1.2MHz Fixed Switching Frequency

1mA Maximum Quiescent Current

Soft-Start Capability

For safety, the device features integrated short-circuit

detection plus over-voltage and thermal shutdown

protections. In addition, input under-voltage lockout

protection is triggered if the battery voltage is low.

Brightness (dimming) control is implemented by applying a

PWM signal of 300Hz to 1kHz on the EN pin. During

shutdown, the FAN5340 disconnects the LED anodes from

the output of the boost regulator, which holds the boost

regulator’s voltage on C_OUT, reducing audible noise from the

PWM dimming and removing power from the LED string.

Input Under-Voltage Lockout (UVLO)

Output Over-Voltage Protection (OVP)

Short-Circuit Detection

Thermal Shutdown (TSD) Protection

8-Lead 3.00 x 3.00mm MLP

8-Bump 1.57 x 1.57mm WLCSP

GND

VIN

C_IN

C_OUT

VOUT

2 – 4

LEDs

GND

Applications

VLED

PGND

Cellular Phones, Smart Phones

Pocket PCs

RSET

WLAN DC-DC Converter Modules

PDA, DSC, PMP, and MP3 Players

Figure 1.

Typical Application

Ordering Information

Operating

Part Number

Package

Packing

Temperature Range

8-Bump, 1.57 x 1.57mm Wafer Level Chip-Scale

Package (WLCSP)

FAN5340UCX

-40 to 85°C

Tape and Reel

FAN5340MPX

(Prelminary)

8-Lead, 3.00 x 3.00mm Molded Leadless

Package (MLP)

FAN5340 • Rev. 1.0.1

www.fairchildsemi.com

12 3 4 5 6 7...12

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