LM3553 1.2A Dual Flash LED Driver System with I2C Compatible Interface | TI.com

LM3553
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1.2A Dual Flash LED Driver System with I2C Compatible Interface

 

Description

The LM3553 is a fixed frequency, current mode step-up DC/DC converter with two regulated current sinks. The device is capable of driving loads up to 1.2A from a single-cell Li-Ion battery.

The LM3553 includes a TX pin that forces Torch mode during a flash event allowing for synchronization between the RF power amplifier and Flash/Torch modes. It also includes a multi-function pin (M/F) that can serve as a GPIO and a hardware RESET pin.

The LM3553 is available in a 3mm by 3mm package.

Features

  • Accurate and Programmable LED Current up to 1.2A in 128 Steps
  • Total Solution Size < 30mm2
  • 90% Peak Efficiency
  • Drives 2 LEDs in Series with 1.2A from 5V Input
  • Drives 2 LEDs in Series with 600mA from 3.0V Input
  • Drives 1 LED with 1.2A from 3.0V Input
  • Adjustable Over-Voltage Protection Allows for Single or Series LED Operation
  • Four Operating Modes: Torch, Flash, Indicator, and Voltage Mode (4.98V)
  • Programmable Flash Pulse Safety Timer in 16 Steps
  • TX Input Ensures Synchronization with RF Power Amplifier Pulse or Prevents LED from Overheating
  • LED Disconnect During Shutdown
  • Flash/Imager Synchronization via FEN Pin
  • Active Low Hardware Reset
  • Multi-Function Pin (RESET and GPIO)
  • Low Profile 12-pin WSON Package (DQB0012A: 3mm x 3mm x 0.8mm, 0.4mm pitch)

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Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) LED (#) Iout (Max) (A) Iq (Typ) (mA) Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LM3553 Order now 2.7     5.5     2     1.2     1     I2C Control
OVP    
-30 to 85     WSON | 12     12WSON: 9 mm2: 3 x 3 (WSON | 12)