MIC2297-15YML Micrel Semiconductor, MIC2297-15YML Datasheet

MIC2297-15YML

Manufacturer Part Number

MIC2297-15YML

Description

Manufacturer

Micrel Semiconductor

Datasheets

1.MIC2297-15YML.pdf (11 pages)

2.MIC2297-15YML.pdf (12 pages)

3.MIC2297-15YML.pdf (11 pages)

Specifications of MIC2297-15YML

Date_code

05+

Packing_info

MLF2525D-10L

Current page: 1 of 11
Download datasheet (278Kb)

3V to 4.2V

General Description

The MIC2297 is a 600KHz PWM boost-switching regulator

that is optimized for driving 6-10 series white LEDs. With

its internal 40V switch and a guaranteed switch current of

1.2A, the MIC2297 easily drives a string of 10 white LEDs

in series at 20mA, ensuring a high level of brightness and

eliminating several ballast resistors.

The MIC2297 implements constant frequency 600KHz

PWM control. The high frequency PWM operation saves

board space by reducing external component sizes. The

added benefit of the constant frequency PWM operation is

much lower noise and input ripple injected back to the

battery source than with variable frequency topologies.

To optimize efficiency, the feedback voltage is set to

200mV. This reduced voltage reduces the power

dissipation in the current set resistor, and allows the lowest

total output voltage, hence minimal current draw from the

battery.

The MIC2297 is available with output over-voltage

protection that protects the IC and external components in

case of open LED conditions.

The MIC2297 is available in low profile small size 10-pin

2.5mm x 2.5mm MLF

junction temperature range of –40°C to +125°C.

___________________________________________________________________________________________________________

Typical Applications

MLF and MicroLeadFrame is a trademark of Amkor Technology, Inc.

March 2008

1-Cell

Li I on

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

1µF

10 Series LED Driver with Output OVP

1µF

VIN

6.8µH-22µH

AGN D

BRT

REF

MIC2297

-42BM L

PGND

package. The MIC2297 has a

COMP

OVP

0.1µF

0.47µF

/50V

3V to 4.2V

1-Ce ll

Li I on

Features

• 2.5V to 10V input voltage range

• Output voltage up to 40V

• 1.2A switch current

• 600KHz PWM operation

• Trimmed 200mV feedback voltage

• Output over voltage protection (fixed or adjustable)

• PWM Brightness Control

• DAC Brightness Control

• <1% line regulation

• 1µA shutdown current

• Over temperature protection

• UVLO

• 10-pin 2.5mm x 2.5mm MLF

• –40

Applications

• PDAs

• GPS systems

• Smart phones

• Mini PCs

• Digital cameras

• IP phones

• LED flashlights

408

) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

10 Series LED Driver with PWM Brightness Control

1µF

C to +125

40V PWM Boost Regulator

PWM

1µF

White LED Driver

C junction temperature range

VIN

6.8µH-22µH

AGND

BRT

REF

MIC2297

-42BM L

PGND

COMP

OVP

package

0.1µF

M9999-032708

0.47µF

/50V

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