MIC2289-15YMLTR Micrel Semiconductor, MIC2289-15YMLTR Datasheet

MIC2289-15YMLTR

Manufacturer Part Number

MIC2289-15YMLTR

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC2289-15BMLTR.pdf (10 pages)

Specifications of MIC2289-15YMLTR

Date_code

05+

Packing_info

2X2

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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

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 variable 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 low profile 6-pin Thin SOT-23

and 8-pin 2mm × 2mm MLF

MIC2289 has 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.

Typical Application

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

July 2007

1-Cell

Li Ion

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

solution

3-Series White LED Driver

1µF

that

MIC2289-15BML

VIN

10µH

requires

GND

OUT

95mV

package options. The

only

four

0.22µF/16V

external

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

• <1µA shutdown current

• Overtemperature protection

• UVLO

• 2mm × 2mm 8-pin MLF

• –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

White LED Driver Internal Schottky

Diode and OVP

3-Series LED Efficiency

MIC2289

package

OUT

(mA)

=3.6V

M9999-071007

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