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.
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 (RESETand GPIO)
■ Low Profile 12-pin LLP Package (SDF12A: 3mm x 3mm x 0.8mm, 0.4mm pitch)
