2mm × 2mm White LED Driver
with Internal Schottky Diode and OVP
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
All support documentation can be found on Micrel’s web
site at www.micrel.com.
• 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
• 2mm × 2mm 8-pin MLF™ package
• –40°C to +125°C junction temperature range
• White LED driver for backlighting
• LED flashlights
• Constant current power supplies
EN FB 95mV
3-Series White LED Driver
3-Series LED Efficiency
700 5 10 15 20 25
MicroLeadFrame 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