LM3553SDXNOPB
Features for the LM3553
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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Description
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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.
The LM3553 is available in a 3mm by 3mm package.
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