MIC2287CYD5TR Micrel Semiconductor, MIC2287CYD5TR Datasheet

MIC2287CYD5TR

Manufacturer Part Number

MIC2287CYD5TR

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC2287-15BMLTR.pdf (10 pages)

Specifications of MIC2287CYD5TR

Date_code

10+

Packing_info

SOT-153

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General Description

The MIC2287 is a 1.2MHz pulse width modulated (PWM),

boost-switching regulator that is optimized for constant-

current, white LED driver applications. With a maximum

output voltage of 34V and a switch current of over 500mA,

the MIC2287 easily drives a string of up to 8 white LEDs in

series, ensuring uniform brightness and eliminating several

ballast resistors.

The MIC2287 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

as opposed to variable frequency topologies is much lower

noise and input ripple injected back to the battery source.

To optimize efﬁciency, the feedback voltage is set to only

95mV. This reduces the power dissipation in the current set

resistor and allows the lowest total output voltage, hence

minimal current draw from the battery.

The MIC2287 is available with 3 levels of overvoltage protec-

tion, 15V, 24V, and 34V. This allows designers to choose the

smallest possible external components with the appropriate

voltage ratings for their applications.

The MIC2287 is available in low proﬁle Thin SOT-23 5-lead and

an 8-lead 2mm × 2mm MLF™ package options. The MIC2287

has a junction 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.

July 2005

MIC2287

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

1µF

MIC2287BD5

VIN

10µH

GND

95mV

CMDSH-3

6.3Ω

0.22µF

Features

• 2.5V to 10V input voltage

• Output voltage up to 34V

• Over 500mA switch current

• 1.2 MHz PWM operation

• 95mV feedback voltage

• Output Overvoltage Protection (OVP)

• Options for 15V, 24V, and 34V OVP

• <1% line and load regulation

• <1µA shutdown current

• Over-temperature protection

• UVLO

• Low proﬁle Thin SOT-23-5 package option

• 8-lead 2mm × 2mm MLF™ package option

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

Applications

• White LED driver for backlighting:

• Photo ﬂash LED driver

• 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

2mm × 2mm MLF™ and Thin SOT-23

with Output OVP in 2mm × 2mm MLF™-8

6-Series White LED Driver

1µF

MIC2287

MIC2287-34BML

VIN

10µH

GND

OVP

CMDSH-3

95mV

6.3Ω

M9999-070105

Micrel, Inc.

0.22µF

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