FAN5606 Fairchild Semiconductor, FAN5606 Datasheet

FAN5606

Manufacturer Part Number

FAN5606

Description

Serial LED Driver with Current-Regulated/ Step-Up DC/DC Converter

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN5606.pdf (9 pages)

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FAN5606

Serial LED Driver with Current-Regulated, Step-Up

DC/DC Converter

Features

• Drives Up to Six LEDs in Series

• Pulse Skip PWM Mode of Operation of the Boost Circuit

• Up to 90% Peak Efﬁciency

• No External Schottky Diode Required

• Up to 25mA Output

• Built-in DAC for Digital Brightness Control

• LED’s Current Can be Duty-Cycle-Modulated

• Digital, Analog, and PWM Brightness Control

• 2.7V to 5V Input Voltage Range

• 0.5MHz Operating Frequency (8MHz internal clock)

• Soft Start

• Low Shutdown Current: I

• LED Short Circuit Protection

• Minimal External Components Needed

• Available in an 8-lead MLP Package

Applications

• Cell Phones

• Handheld Computers

• PDAs, DSCs, MP3 Players

• Keyboard Backlights

• LED Display

Typical Applications

2.7V to 5V L = 6.8µH

External

Analog Brightness Control

IND

OUT

GND

< 1

CAT

4.7µF

OUT

Description

The FAN5606 LED driver generates regulated output cur-

rents from a battery with input voltage varying between 2.7V

to 5V. An internal NMOS switch drives an external inductor,

and a Schottky diode delivers the inductor’s stored energy to

the load. Soft start circuitry prevents excessive current drawn

from the supply during power on. Any number of LEDs can

be connected in series as long as the summed forward volt-

ages do not lead to exceeding the speciﬁed operating output

voltage range.

In the FAN5606 device, the internal two-bit D/A converters

provide programmability of the output channel current.

Analog programming of the output current is also possible

in the FAN5606. To do this, ground the “B” pin and connect

a resistor between the “A” pin and a ﬁxed supply voltage.

The output current can then be programmed to any desired

value within its speciﬁed range. The analog version uses a

single external resistor to set the current, and to turn the

device ON and OFF. The device is available in an 8-lead

MLP package.

2.7V to 5V

DAC Inputs

L = 6.8µH

Digital Brightness Control

IND

www.fairchildsemi.com

GND

CAT

4.7µF

REV. 1.0.2 5/14/04

OUT

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