Használati útmutató Microchip MIC2870

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 2018 Microchip Technology Inc.DS20006078A-page 1

MIC2870

Features

•Up to 1.5A Flash LED Driving Current

• 2.7V to 5.0V Input Voltage Range

•High-Efficiency 2 MHz V

F

Adaptive Boost Driver

•Configurable 1 or 2 Channel(s) WLED Driver

•LED Driving Current Soft-Start

•Control through I

2

C Interface or External Pins

•Flash Inhibit Function for GSM Pulse

Synchronization

•True Load Disconnect

•Flash Time-Out Protection

•1 µA Shutdown Current

•Available in 16-Pin 2 mm x 2 mm TQFN Package

Applications

•Camera Phones/Mobile Handsets

•Cellular Phones/Smartphones

•LED Light for Image Capture/Auto-Focus/

White Balance

•Handset Video Light (Torch Light)

•Digital Cameras

•Portable Applications

General Description

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

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

The LED drive 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 750 mA 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 mode that can

be controlled through either an I

2

C interface or external

pins. The brightness in the Flash and Torch mode can be

adjusted via two external resistors individually. The

high-speed mode I

2

C interface provides a simple control

at a clock speed up to 3.4 MHz to support most camera

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

capture (Flash mode).

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

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

+125°C.

1.5A Synchronous Boost Flash LED Driver with

I

2

C Interface

Termékspecifikációk