FAN5609 Fairchild Semiconductor, FAN5609 Datasheet

FAN5609

Manufacturer Part Number

FAN5609

Description

LED Driver with Adaptive Charge Pump DC/DC Converter

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN5609.pdf (11 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

FAN5609MPX

Manufacturer:

FAIRCHILD/仙童

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

FAN5609MPX/

Manufacturer:

MICRON

Quantity:

Current page: 1 of 11
Download datasheet (113Kb)

FAN5609

LED Driver with Adaptive Charge Pump DC/DC

Converter

Features

• Parallel LED Driver Supports All Forward Voltages

• Adaptive V

• Internally Matched LED Current Sources

• No External Components Needed to Set LED Current

• Built-in Charge Pump has Three Modes of Operation:

• Up to 86% Efﬁciency

• Low EMI, Low Ripple

• Up to 80mA Output Current (4 × 20mA)

• Built-in DAC for Digital or PWM Brightness Control

• Can be Duty Cycle Modulated between 0 to 18mA

• 2.7V to 5.5V Input Voltage Range

• I

• 1MHz Operating Frequency

• Shutdown Isolates Output from Input

• Soft-Start Limits Inrush Current

• Short Circuit Protection

• Minimal External Components Needed

• Available in a 14-lead TSSOP Package

• Available in a 16-lead MLP Package

Typical Application

– Linear Regulation V

– 3/2 DC-DC Converter and Regulation 3.6V<V

– 2/1 DC-DC Converter and Regulation 2.7V<V

< 2µA in Shutdown Mode

OUT

Adjustment to the Highest Diode Voltage

> 4.2V

IN A

IN B

OUT

LED-

<4.2V

<3.6V

FAN5609

LED-

GND

Applications

• Cell Phones

• Handheld Computers

• PDA, DSC, MP3 Players

• Keyboard Backlight

• LED Displays

Description

The FAN5609 generates regulated output current from a

battery with input voltage varying between 2.7V to 5.5V.

Switch reconﬁguration and fractional switching techniques

are utilized to achieve high efﬁciency over the entire input

voltage range. A proprietary internal circuitry continuously

monitors each LED current loop and automatically adjusts

the generated output DC voltage to the lowest minimum

value required by the LED having the highest forward

voltage. This adaptive nature of the FAN5609 eliminates the

need for LED pre-selection (matching) and ensures opera-

tion at high efﬁciency. When the input voltage is sufﬁciently

high to sustain the programmed current level in the LEDs,

the FAN5609 re-conﬁgures itself to operate as a linear

regulator, and the DC-DC converter is turned off. An internal

two-bit digital to analog converter provides programmability

of the output currents. Only two 0.1µF bucket capacitors and

two 4.7µF input/output capacitors are needed for proper

operation.

Soft-start circuitry prevents excessive current draw during

power on. The device has built-in short circuit protection.

LED-

CAP+

CAP-

LED-

OUT

CAP2

CAP1

OUT

www.fairchildsemi.com

REV. 1.0.2 5/30/03

Related parts for FAN5609

Related keywords

FAN5609 datasheet
FAN5609 data sheet
FAN5609 pdf datasheet
FAN5609 component
FAN5609 part
FAN5609 distributor
FAN5609 RoHS
FAN5609 datasheet download