LM3559 Description
The LM3559 is a 2-MHz fixed-frequency synchronous boost converter with two 900-mA constant current drivers for high-current white LEDs. The dual highside current sources allow for grounded cathode LED operation and can be tied together for providing flash currents of up to 1.8 A. An adaptive regulation method ensures the current for each LED remains in regulation and maximizes efficiency.
LM3559 Key Features
- 1 Dual High-Side Current Sources Allow for Grounded Cathode LED Operation
- Accurate and Programmable LED Current from 28.125 mA to 1.8 A
- Optimized Flash Current During Low Battery Conditions
- Independent LED Current Source Programmability
- Four Operating Modes: Torch, Flash, Privacy
- 4-Bit Analog-to-Digital (ADC) for VLED Monitoring
- Battery Voltage Sensing and Current Scale-Back
- LED Sensing and Current Scale-Back
- Hardware Flash and Torch Enable
- Active-Low Hardware Reset