MIC2289 Micrel Semiconductor, MIC2289 Datasheet

MIC2289

Manufacturer Part Number

MIC2289

Description

2mm 2mm White LED Driver with Internal Schottky Diode and OVP

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC2289.pdf (9 pages)

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Download datasheet (89Kb)

General Description

The MIC2289 is a PWM (pulse width modulated), boost-

switching regulator that is optimized for constant-current

white LED driver applications. The MIC2289 features an

internal Schottky diode and three levels of output overvoltage

protection providing a small size and efficient DC/DC solution

that requires only four external components.

To optimize efficiency, the feedback voltage is set to only

95mV. This reduces power dissipation in the current set

resistor and allows the lowest total output voltage, hence

minimal current draw from the battery.

The MIC2289 implements a constant frequency 1.2MHz

PWM control scheme. The high frequency, PWM operation

saves board space by reducing external component sizes.

The added benefit of the constant frequency PWM scheme in

caparison to varible frequency is much lower noise and input

ripple injected to the input power source.

The MIC2289 clamps the output voltage in case of open LED

conditions, protecting itself and the output capacitor. The

MIC2289 is available with three output OVP options of 15V,

24V, and 34V. The different OVP options allows the use of

the smallest possible output capacitor with the appropriate

voltage rating for a given application.

The MIC2289 is available in a 2mm 2mm 8-pin MLF™

package and has a junction temperature range of –40 C to

+125 C.

All support documentation can be found on Micrel’s web

site at www.micrel.com.

Typical Application

Micro

August, 2004

MIC2289

LeadFrame and MLF are trademarks of Amkor Technology, Inc.

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

1-Cell

Li Ion

3-Series White LED Driver

1 F

MIC2289-15BML

VIN

10 H

GND

OUT

95mV

6.3

0.22 F/16V

Features

• 2.5V to 10V input voltage

• Output voltage up to 34V

• Internal Schottky diode

• 15V, 24V, 34V output OVP options

• 1.2 MHz PWM operation

• Over 500mA switch current

• 95mV feedback voltage

• <1% line and load regulation

• <1mA shutdown current

• Overtemperature protection

• UVLO

• 2mm 2mm 8-pin MLF™ package

• –40 C to +125 C junction temperature range

Applications

• White LED driver for backlighting

• LED flashlights

• Constant current power supplies

Cell phones

PDAs

GPS systems

Digital cameras

MP3 players

IP phones

with Internal Schottky Diode and OVP

2mm

2mm White LED Driver

3-Series LED Efficiency

MIC2289

OUT

(mA)

=3.6V

M9999-081104

Micrel

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