LM3642 Description
The LM3642 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing Flash current up to 1.5 A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.
LM3642 Key Features
- 1 1.5-A High-Side Current Source for Single LED
- > 85% Efficiency in Torch Mode (at 100 mA) and
- Accurate Programmable Flash LED Current from
- Accurate Programmable Torch LED Currents
- 48.4 mA to 375 mA
- 24 mA to 187 mA (LT option)
- Small Solution Size: < 20 mm2
- Soft-Start Operation for Battery Protection
- Hardware Strobe Enable
- Synchronization Input for RF Power Amplifier Pulse Events