MIC2292/93C

High Frequency PWM White LED Drivers

with Internal Schottky Diode and OVP

General Description

The MIC2292C and MIC2293C are high frequency, Pulse

Width Modulator (PWM) boost regulators optimized for

constant-current, white LED driver applications. Because

of their constant PWM switching frequencies of 1.6MHz

and 2MHz, respectively, the MIC2292/93C can use the

smallest external components, allowing designers to avoid

sensitive IF bands in their RF applications.

The products feature an internal Schottky diode and two

levels of output overvoltage protection allowing a small

size and efficient DC/DC solution that requires only four

external components.

The 2.5V to 10V input voltage range of MIC2292/3C allows

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

cell NiCad/NiMH/Alkaline batteries. The MIC2292/3C pro-

ducts are available in a small size 8-pin 2mm × 2mm MLF

®

package and have a junction temperature range of

–40°C to +125°C.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• 2.5V to 10V input voltage

• Output voltage up to 34V

• Internal Schottky diode

• 1.6MHz PWM operation (MIC2292C)

• 2.0MHz PWM operation (MIC2293C)

• Stable with ceramic capacitors

• 15V and 34V output overvoltage protection options

• 500mA switch current rating

• 95mV feedback voltage

• <1% line and load regulation

• <1µA shutdown current

• Over-temperature protection

• UVLO

• –40°C to +125°C junction temperature range

Applications

• White LED driver for backlighting:

– Cell phones

– PDAs

– GPS systems

– Digital cameras

– MP3 players

– IP phones

• Constant current power supplies

Typical Application

15µH

0.22µF

16V

95mV

Li Ion

1µF

MIC2292C-15YML

VIN

EN

SW

FB

OUT

GND

10µH

0.22µF

16V

95mV

Li Ion

1µF

MIC2293C-15YML

VIN

EN

SW

FB

OUT

GND

1.6MHz PWM White LED Driver with 15V OVP

2MHz PWM White LED Driver with 15V OVP

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

September 2009

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