The LM3560 is a 2MHz fixed frequency synchronous boost converter with two 1000 mA constant current drivers for high-current white LEDs. The dual high-side current sources allow for grounded cathode LED operation and can be tied together for providing flash currents at up to 2A through a single LED. An adaptive regulation method ensures the current for each LED remains in regulation and maximizes efficiency.

The LM3560 is controlled via an I2C-compatible interface. Features include: an internal 4-bit ADC to monitor the LED voltage, independent LED current control, a hardware flash enable allowing a logic input to trigger the flash pulse, dual TX inputs which force the flash pulse into a low-current torch mode allowing for synchronization to RF power amplifier events or other high-current conditions, and an integrated comparator designed to monitor an NTC thermistor and provide an interrupt to the LED current. Additionally, an active high HWEN input provides a hardware shutdown during system software failures.

The 2MHz switching frequency, over-voltage protection and adjustable current limit allow for the use of tiny, low-profile (1 µH and 2.2 µH) inductors and (10 µF) ceramic capacitors. The device is available in a ultra-small 16-bump (1.97mm × 1.97mm × 0.6mm) DSBGA package and operates over the −40°C to +85°C temperature range.

• Dual High-Side Current Sources Allow for Grounded Cathode LED Operation
• Accurate and Programmable LED Current from 31.25mA to 2A
• Independent LED Current Source Programmability
• Up to 90% Efficient
• Ultra-Small Solution Size: < 26 mm2
• Four Operating Modes: Torch, Flash, Privacy Indicate, and Message Indicator
• 4-Bit ADC for VLED Monitoring
• LED Thermal Sensing and Current Scale-Back
• Hardware Flash and Torch Enable
• Dual Synchronization Inputs for RF Power Amplifier Pulse Events
• LED and Output Disconnect During Shutdown
• Open and Short LED Detection
• 400-kHz I2C-Compatible Interface
• Active Low Hardware Reset
• 16-Bump (1.97mm × 1.97mm × 0.6mm) DSBGA