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SGM3784

Dual 1.1A LED Flash Driver with I2C-Compatible Interface
 
Dual 1.1A LED Flash Driver with I2C-Compatible Interface
GENERAL DESCRIPTION

The SGM3784 is a very compact, highly efficient, dual white LED flash driver for high resolution camera phones that improves picture and video quality in low light environments. The device integrates a programmable 1.6MHz or 3MHz synchronous inductive boost converter, an I2C-compatible interface, and two 1.1A current sources. The high switching frequency enables the use of a tiny, 1mm high, low cost, 1μH power inductor, and the parallel current sources permit LED cathode grounding for thermally enhanced, low EMI and compact layouts.

The LED driver maximizes efficiency over the entire battery voltage range to maximize the input-power-to-LED-power conversion and minimize battery current draw during flash events.

A programmable DC battery current limit safely maximizes LED current for all LED forward voltage and battery voltage conditions.

A Transmitter Mask (TxMASK) input enables fast reduction of the flash LED currents and battery current during a power amplifier current burst. The I2C-compatible interface can be used to program timers and currents and to read back status bits for operation monitoring and safety control.

The SGM3784 is available in WLCSP-2×1.6-12B package and operates within specification over the full -40 to +85 operating temperature range.

PIN CONFIGURATIONS

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FEATURES
  • Ultra Compact Solution

      Small, WLCSP-2×1.6-12B Package

      Smallest Footprint, 1mm-Height, 1μH Power Inductor

  • LED Current Source for Local LED Grounding

      Simplified Routing to and from LEDs

      Improved LED Thermal Dissipation

  • Synchronous 3MHz PWM Boost Converter, No External Diode

  • High Efficiency: 95% Peak

  • I2C Programmable

      Currents up to 1.1A in Flash Mode per LED When VIN is not Lower than 3.6V (The Total 2  LEDs Current is 1.5A When VIN is Lower than 3.6V)

      Torch Mode

      Programmable DC Battery Current Limit

      Programmable Flash Timer up to 1600ms

      Low Battery Mode to Reduce LED Current Automatically

  • Device Control

      I2C-Compatible Control Registers

      External STROBE and Torch Input Pins

      Transmitter Mask (TxMASK) Input

  • Safety Features

      Thermal Overload Protection

      Inductor Fault Detection

      LED Short-Circuit/Open-Circuit Protection

APPLICATIONS

Camera-Enabled Cellular Phones and Smart-Phones

Digital Still Cameras, Camcorders and PDAs

ORDERING INFORMATION
Part NumberStatusPackagePinsPb-FreeTemp Range
SGM3784YG/TRProductionWLCSP-2×1.6-12B12Y-40℃ to +85℃Samples

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