描述 Description

TheCP2159 is a dual LED flash driver that provides a high level of adjustabilitywithin a small solution size. The CP2159 utilizes a 2MHz or 4MHzfixed-frequency synchronous boost converter to provide power to the dual 1.5-Aconstant current LED sources. The total LED current the CP2159 boost can deliveris 1.5A (ILED1+ILED2). The dual 128 level current sourcesprovide the flexibility to adjust the current ratios between LED1 and LED2 witheach driver capable of delivering a maximum of 1.5A (ex: ILED1=1.5Aand ILED2=OFF, ILED1=OFF and ILED2=1.5A, or acurrent configuration with a current less than 1.5A, ILED1=950mA andILED2=250mA). An adaptive regulation method ensures the currentsources remain in regulation and maximizes efficiency. Features of the CP2159are controlled via an I2C-compatible interface. These featuresinclude: hardware flash and hardware torch pins (STROBE and TORCH/TEMP), a TXinterrupt, and an NTC thermistor monitor. The device offers independentlyprogrammable currents in each output leg to drive the LEDs in a Flash or MovieMode (Torch) condition. The 2-MHz or 4-MHz switching frequency options,overvoltage protection (OVP), and adjustable current limit allow for the use oftiny, low-profile inductors and (10-uF) ceramic capacitors. The device operatesover a -40℃ to 85℃ ambient temperature range.

特性 Features

-Dual High-Side Current Sources Allw for grounded Cathode LED Operation
?-IndependentLED Current Source Programmability
-Accurateand Programmable LED Current from 1.4mA to 1.5A
-Optimized Flash LED Current During Low Battery Conditions (IVFM)
->85% Efficiency in Torch Mode (@ 100mA) and Flash Mode (@ 1A to 1.5A)
?-SmallSolution Size
?-HardwareStrobe Enable (STROBE)
-Synchronization Inputfor RF Power Amplifier Pulse Events (TX)
-HardwareTorch Enable (TORCH/TEMP)
?-Remote NTC Monitoring (TORCH/TEMP)
?-400-kHzI2C-Compatible Interface
-Available in 12-Pin 1.66mm x1.26mm CSP Package

應用 Application

Camera Phone LED Flash