MIC2298_11 Datasheet, PDF (1/13 Pages) Micrel Semiconductor – 3.5A Minimum, 1MHz Boost High Brightness White LED Driver

MIC2298
3.5A Minimum, 1MHz Boost High
Brightness White LED Driver
General Description
The MIC2298 is a high power boost-switching regulator
that is optimized for constant-current control. The MIC2298
is capable of driving up to 2 series 1A white LED for
photoflash, flashlight and other applications. The feedback
voltage is only 200mV, minimizing ballast power dissipa-
tion in constant-current control applications for improved
operating efficiency.
The MIC2298 has a brightness pin that allows for a
programmable torch mode as well full flash with a single
pin when driving high current LEDs.
The MIC2298 implements a constant frequency 1MHz
PWM control scheme to make the smallest possible
design.
The 2.5V to 10V input voltage range of MIC2298 allows
direct operation from 1- and 2-cell Li Ion as well as 3- to 6-
cell NiCad/NiMH/Alkaline battery sources. Maximum
battery life is assured with a low 1µA shutdown current.
The MIC2298 is available in a low profile 12-pin 3x3 MLF^®
package.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
• 3.5A minimum switch current delivers at least 7W of
output power over-temperature
• 200mV ±10% feedback voltage
• 2.5V to 10V input voltage
• Output voltage up to 30V (max)
• 12-pin 3mm x 3mm leadless MLF^® package
• Available output over-voltage protection (OVP)
• 1MHz operation
• Programmable output current
• <1% line regulation
• 1µA shutdown current
• Over temperature protection
• Externally programmable soft-start
• Under-voltage lockout (UVLO)
• –40^°C to +125^°C junction temperature range
Applications
• Cell phones
• PDAs
• Digital cameras
• White LED flashlights
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Typical Application
Figure 1. High Power White LED Driver
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
October 2007
M9999-101707-B