September 2007

© 2006 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN5645 • Rev. 1.0.0

FAN5645

Indicator LED Blinker with Single-Wire Interface

Features

Records and plays back blink patterns

Single-wire digital control of LED blink rate and intensity

Resistor-programmable LED maximum current

High-side constant-current driver topology:

-

20mA maximum output

-

40mV typical dropout at 20mA

33µA operating current

Standard 1.8V logic

Short-circuit protection

Thermal Shutdown Protection

Under-Voltage Lockout Protection

6-pin 3.0 x 3.0mm MLP package

Applications

Cell Phones, Smart-Phones

Pocket PCs, Bluetooth

PDA, DSC, PMP, and MP3 Players

Laptop Computers

Description

The FAN5645 is a flexible and compact solution for a

blinking LED indicator. The internal programmable blink

algorithm eliminates any need for continual system

processor control. This means longer battery life for the

hand-held system because the system processor is not

awakened from sleep mode just to blink an LED.

Very low dropout of 40mV allows driving an LED without

any inductors or switch capacitors.

An external resistor sets the LED output current level.

LED blink rate and intensity is controlled by a simple

one-wire interface. In shutdown mode, the supply

current is reduced to 0.3µA (typical).

The FAN5645 is available in 6-pin molded leadless

package (MLP).

Typical Application

VIN

2.7to5.5V

CTRL

LED+

GND

ISET

Control

GND

0.1µF

Figure 1. Typical Application for the FAN5645

Ordering Information

Part Number

Package

Pb-Free Operating Temperature Range

Packing Method

FAN5645MPX

MLP-6 3.0 x 3.0mm

-40°C to 85°C

Tape and Reel

Bluetooth® is a registered trademark of Motorola, Inc.