MIC2870

1.5A Synchronous Boost Flash LED Driver

with I

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

September 5, 2013

Revision 1.0

General Description

The MIC2870 is a high-current, high-efficiency flash LED

driver for one or two high-brightness camera flash LEDs.

The LED driver current is generated by an integrated

inductive boost converter with 2MHz switching frequency

which allows the use of a very-small inductor and output

capacitor. These features make the MIC2870 an ideal

solution for high-resolution camera phone LED flashlight

driver applications.

MIC2870 supports two 750mA white-LEDs (WLEDs) or a

single 1.5A WLED configuration. When two WLEDs are

connected, their currents are matched automatically.

MIC2870 operates in either flash or torch modes that can

be controlled through either an I

pins. The brightness in the flash and torch mode can be

adjusted via two external resistors individually. High-speed

mode I

speed up to 3.4MHz to support most camera functions

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

(flash mode).

The MIC2870 is available in 16-pin, 2mm × 2mm TQFN

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 1.5A flash LED driving current

− 2.7V to 5.0V input voltage range

• High-efficiency 2MHz V

• Configurable 1 or 2 channel(s) WLED driver

• LED driving current soft-start

• Flash inhibit function for GSM pulse synchronization

• True load disconnect

• Flash time-out protection

• 1µA shutdown current

• Available in 16-pin 2mm × 2mm TQFN package

Applications

• Camera phones/mobile handsets

• Cellular phones/smart phones

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

• Handset video light (torch light)

• Digital cameras

• Portable applications

Typical Application