FAN5607 Fairchild Semiconductor, FAN5607 Datasheet

FAN5607

Manufacturer Part Number

FAN5607

Description

LED Driver with Adaptive Charge Pump DC/DC Converter

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN5607.pdf (13 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

FAN5607HMPX

Manufacturer:

FAIRCHILD/仙童

Quantity:

20 000

Current page: 1 of 13
Download datasheet (547Kb)

FAN5607

LED Driver with Adaptive Charge Pump DC/DC

Converter

Features

• Parallel LED Driver Supports all Forward Voltages

• Adaptive V

• Internally Matched LED Current Sources

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

• Up to 93% Efﬁciency

• Low EMI, Low Ripple

• Up to 120mA Output Current (

• External Resistor to Set Maximum (100%) LED Current

• Enable Input Can be Duty-Cycle-Modulated to Control

• 2.4V 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 4x4mm 16-lead MLP Package

Applications

• Cell Phones

• Handheld Computers

• PDA, DSC, MP3 Players

• Keyboard Backlight

• LED Displays

Typical Application

– 1X, 1.5X, and 2X Mode

LED Current Level Between 0 and 100%

< 1µA in Shutdown Mode

OUT

Adjustment to the Highest Diode Voltage

)

SET

OUT

LED-

FAN5607

LED-

GND

Description

The FAN5607 generates regulated output current from a bat-

tery 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 volt-

age. This adaptive nature of the FAN5607 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 FAN5607 re-conﬁgures itself to operate as a linear regu-

lator, and the DC-DC converter is turned off. Only two 0.1µF

to 1µF bucket capacitors and two 4.7µF input/output capaci-

tors are needed for proper operation. LED current can be

programmed using an external resistor. The resistor sets the

maximum LED current and a PWM signal applied to the

enable pin can modulate that current level between 0mA

(off) and the maximum level.

Soft-start circuitry prevents excessive current draw during

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

The device is available in 4x4mm 16-lead MLP package.

LED-

CAP+

LED-

CAP-

OUT

CAP2

CAP1

OUT

www.fairchildsemi.com

REV. 1.0.0 6/22/04

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