MIC2871 查看數據表（PDF） - Micrel

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MIC2871

1.2A High-Brightness LED Flash Driver with Single-Wire Serial Interface

Micrel 

MIC2871

1.2A High-Brightness LED Flash Driver with

Single-Wire Serial Interface

General Description

The MIC2871 is a high-current, high-efficiency flash LED

driver. The LED driver current is generated by an

integrated inductive boost converter with a 2MHz switching

frequency which allows the use of very small inductor and

output capacitor. These features make the MIC2871 an

ideal solution for high-resolution camera phone LED flash

light driver applications.

The MIC2871 operates in either flash or torch modes that

can be controlled through the single-wire serial interface

and/or external control pins. Default flash and torch

brightness can be adjusted via an external resistor. A

robust single-wire serial interface allows simple control by

the host processor to support typical camera functions

such as auto-focus, white balance, and image capture

(flash mode).

The MIC2871 is available in a 14-pin 3mm × 2mm LDFN

package with a junction temperature range of −40°C to

+125°C.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

• Up to 1.2A flash LED driving current

• Highly-efficient, synchronous boost driver (up to 94%)

• ±5% LED current accuracy

• Control through single-wire serial interface or external

control pins

• Input voltage range: 2.7V to 5.5V

• True load disconnect

• Configurable safety time-out protection

• Output overvoltage protection (OVP)

• LED short detection and protection.

• 1µA shutdown current

• Available in 14-pin 3mm × 2mm LDFN package

Applications

• Camera phones/mobile handsets

• Cell phones/smartphones

• LED light for image capture/auto focus/white balance

• Handset video light (torch light)

• Digital cameras

• Portable applications

Typical Application

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

May 29, 2013

052913-1.0 (while in progress)

Revision 1.0 (final document)

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