Microchip MIC2299 Handleiding

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MIC2299

3.5A Minimum, 2MHz High Brightness

LED Driver

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

408

) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

October 2007

M9999-101907-B

General Description

The MIC2299 is a high power boost-switching regulator

that is optimized for constant-current control. The MIC2299

is capable of driving up to 2 series 1A white LED for

photoflash and other applications. The feedback voltage is

only 200mV, minimizing power dissipation in constant-

current control applications, and hence extends battery

life.

The MIC2299 has a brightness pin that allows for a

programmable torch mode as well as full flash with a

single pin when driving high current LEDs.

The MIC2299 implements a constant frequency 2MHz

PWM control scheme to make the smallest possible

design. The MIC2299’s 2MHz operation avoids signal

interference in the AM band.

The 2.5V to 10V input voltage range of MIC2299 allows

direct operation from 1- and 2-cell Li-Ion as well as 3- to 4-

cell NiCad/ NiMH/ Alkaline or lithium batteries. Maximum

battery life is assured with a low 1uA shutdown current.

The MIC2299 is available in a low profile 12-pin 3mm x

3mm MLF

®

package.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

•Programmable current control

•200mV ±10% feedback voltage

•2.5V to 10V input voltage

•Output over-voltage protection (OVP)

•Output voltage up to 30V (max)

•Fixed 2MHz Operation

•Guaranteed 3.5A switch current over-temperature

•Solution size of just 0.25in

2

(1.6cm

2

)

•Output power range of 7W to 12W

•<1% line regulation

•1µA shutdown current

•Over temperature protection

•Externally programmable soft-start

•Under-voltage lockout (UVLO)

•12-pin 3mm x 3mm leadless MLF

®

package

•–40

°

C to +125

°

C junction temperature range

Applications

•Cell phones

•PDAs

•Digital cameras

•White LED flashlights

___________________________________________________________________________________________________________

Typical Application

Figure 1. High Power White LED Driver

Product specificaties