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Current Paths:Home > Products > LED Flash Driver > DIO5644

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DIO5644

Dual 1.5A Current Source Camera Flash LED Driver

Description

The DIO5644 is a dual LED flash drive that provides a high level of adjustability within a small solution size. The DIO5644 utilizes a 2MHz or 4MHz fixed-frequency synchronous boost converter to provide power to the dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2. An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.

 

Features of the DIO5644 are controlled via an I2C-compatible interface. These features include: hardware flash and hardware torch pins (STROBE and TORCH/TEMP), a TX interrupt and an NTC thermistor monitor. The device offers independently programmable currents in each output leg to drive the LEDS in a Flash or Movie Mode (Torch) condition.

 

The 2-MHz or 4-MHz switching frequency options, overvoltage protection(OVP), and adjustable current limit allow for the use of tiny, low-profile inductors and (10µF) ceramic capacitors. The device operates over a -40 to 85 ambient temperature range.


Features

●  Dual Independent 1.5A LED Current Source

  Programmability

  Accurate and Programmable LED Current

  Range from 1.4mA to 1.5A

  Optimized Flash LED Current During Low

Battery Conditions (IVFM)

  >87% Efficiency in Torch Mode (@100mA)

and Flash Mode (@1A to 1.5A)

  Grounded Cathode LED Operation for

Improved Thermal Management

  Small Solution Size: <16mm

  Hardware Strobe Enable (STROBE)

  Synchronization Input for RF Power Amplifier

Pulse Events (TX)

  Hardware Torch Enable (TORCH/TEMP)

  Remote NTC Monitoring (TORCH/TEMP)

  400kHz I2C-Compatible Interface


Applications

●  Camera Phone White LED Flash

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