FAN5646S700X【PDF 1/13 页】IC LED DRIVER BLINKER SC70-5

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May 2013

FAN5646

Programmable Indicator ―Soft‖ LED Blinker with TinyWire?

Single-Wire Interface

Features

Description

LED “S oft ” Blink: with Logarithmic Fade Up and Fade

Down for Power Savings

Follow or Repeat Pattern Mode for Blinking when

Applications Processor is Powered Down

Default Pattern Optionally Modified using TinyWire ?

Single-Wire Digital Control for:

– LED Current Rise / Fall Time

– t ON and t OFF for Up to Two Pulses

High-Side Constant Current LED Driver:

– 20 mA Maximum Output Current

– 80 mV Drop-out at 20 mA I OUT

– External R SET (SC70 only) or Internal Current

Programming

35 ? A Operating Quiescent Current

Short-Circuit, Under-Voltage, and Thermal Protections

Wide Input Range: 2.7 to 5.5 V

The FAN5646 is a flexible and compact solution for a blinking

or “breathing” LED indicator. The internal programmable blink

algorithm eliminates any need for continual system processor

control. This means longer battery life for a hand-held system

because the system processor is not awakened from sleep

mode to blink an LED.

Very low dropout of 80 mV allows driving an LED without any

inductors or switch capacitors. LED blink rate, rise and fall

time, and CTRL line behavior can be programmed by a

TinyWire ? single-wire digital interface. The on-time and time

between pulses can be set for up to two different pulse widths.

The default for FAN5646 option 01 is “ f ollow” mode, where the

LED turns on with the programmed rise time, then stays on as

long as CTRL remains HIGH. When CTRL falls, the LED turns

off at the programmed fall time. For option 00; when CTRL is

HIGH continuously, the LED repeats the programmed pattern.

The FAN5646 is available in a four-pin wafer-level chip-scale

package with 0.4 mm pitch or a five-lead SC70 package.

4-Bump WLCSP, 0.4 mm pitch or

2.7 to 5.5V

VIN

LED+

5-Lead SC70 (EIAJ SC88)

Applications

? Cell Phone

0.1 ?

GND

ISET

CTRL

Pocket PCs and Digital Cameras

Bluetooth ? Headsets PMP and MP3 players

R=24.3k W

Figure 1. Typical Application

Ordering Information

Part Number

Option Follow Bit Default Temperature Range

Package

Packing

FAN5646UC00X

-40 to 85°C

WLCSP-4, 0.4mm Pitch

Tape and Reel

FAN5646S700X

-40 to 85°C

5-Lead SC70, EIAJ SC88 Tape and Reel

FAN5646UC01X

-40 to 85°C

WLCSP-4, 0.4mm Pitch

Tape and Reel

FAN5646S701X

-40 to 85°C

5-Lead SC70, EIAJ SC88 Tape and Reel

Bluetooth? is a registered trademark of Bluetooth SIG, Inc.

Important: Contact a Fairchild Semiconductor sales representative for additional performance information and specifications.

? 2009 Fairchild Semiconductor Corporation

FAN5646 ? Rev. 1.0. 3

www.fairchildsemi.com

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