The LM3560 is a 2-MHz 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 2 A 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 device is available in an ultra-small 16-pin DSBGA package. The 2-MHz switching frequency, overvoltage protection and adjustable current limit allow for the use of tiny, low-profile (1-µH and 2.2-µH) inductors and ceramic (10-µF) capacitors.
●For all available packages, see the orderable addendum at the end of the data sheet.
● Dual High-Side Current Sources Allow for Grounded Cathode LED Operation
● Accurate and Programmable LED Current from 31.25 mA to 2 A
● 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
● −40°C to +85°C Ambient Temperature Range
