MIC3287-24YMLTR Micrel Semiconductor, MIC3287-24YMLTR Datasheet

MIC3287-24YMLTR

Manufacturer Part Number

MIC3287-24YMLTR

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC3287-24YMLTR.pdf (9 pages)

Specifications of MIC3287-24YMLTR

Date_code

05+

Packing_info

22D-08L

Available stocks

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Part Number

Manufacturer

Quantity

Price

Company:

H&T Electronics

Part Number:

MIC3287-24YMLTR

Quantity:

14 895

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General Description

The MIC3287 is a 1.2MHz pulse width modulated (PWM)

step-up switching regulator that is optimized for constant

current white LED driving applications. With a maximum

output voltage of 24V and a switch current of over 350mA,

the MIC3287 drives a string of up to 4 white LEDs in series,

ensuring uniform brightness and eliminating several ballast

resistors.

The MIC3287 implements a constant frequency 1.2MHz PWM

current-mode control scheme. The high frequency PWM op-

eration saves board space by reducing external component

sizes. The added beneﬁt of the constant frequency PWM

control scheme as opposed to variable frequency control

schemes is much lower noise and input ripple injected back

to the battery source. To optimize efﬁciency, the feedback

voltage is set to only 250mV. The MIC3287 is also available

with a maximum 24V over-voltage protection.

The MIC3287 is available in low proﬁle Thin SOT-23 5-pin

and Thin SOT-23 6-pin packages. The MIC3287 has a junc-

tion 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

MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.

February 2006

MIC3287

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

3-Series White LED Driver in Thin SOT-23-5

1µF

MIC3287YD5

VIN

10µH

GND

250mV

0.22µF

Features

• 2.8V to 5.5V Input Voltage

• 350mA Switch Current

• 1.2 MHz PWM Operation

• 250mV Feedback Voltage

• 24V Output Over-Voltage Protection (OVP) Option

• <1% Line and Load Regulation

• <1µA Shutdown Current

• Over-Temperature Protection

• Under-Voltage Lock Out (UVLO)

• Low Proﬁle Thin SOT-23-5 Package Option

• Low Proﬁle Thin SOT-23-6 Package Option

• 8-pin 2mm x 2mm MLF™ Package Option

• –40°C to +125°C Junction Temperature Range

Applications

• White LED Driver for Backlighting:

• LED Flashlights

• Constant Current Power Supplies

1.2MHz PWM White LED Driver with OVP in

- Cell phones

- PDAs

- GPS systems

- Digital cameras

- MP3 players

- IP phones

1-Cell

Li Ion

Thin SOT-23 and 2mm x 2mm MFL™

with Output OVP in Thin SOT-23-6

4-Series White LED Driver

1µF

MIC3287

MIC3287-24YD6

VIN

10µH

GND

OVP

250mV

M9999-022106

Micrel, Inc.

0.22µF

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