MIC2871 Datasheet, PDF (1/24 Pages) Micrel Semiconductor – 1.2A High-Brightness LED Flash Driver with Single-Wire Serial Interface

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 [phone] • fax + 1 [phone] • http://www.micrel.com
May 29, 2013
052913-1.0 (while in progress)
Revision 1.0 (final document)