MIC2870 Datasheet, PDF (1/25 Pages) Micrel Semiconductor – 1.5A Synchronous Boost Flash LED Driver with I2C Interface

MIC2870
1.5A Synchronous Boost Flash LED Driver
with I²C Interface
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 I²C interface or external
pins. The brightness in the flash and torch mode can be
adjusted via two external resistors individually. High-speed
mode I²C interface provides a simple control at a clock
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_F adaptive boost driver
• Configurable 1 or 2 channel(s) WLED driver
• LED driving current soft-start
• Control through I²C interface or external pins
• 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
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
September 5, 2013
Revision 1.0