| Input voltage (type) | DC/DC |
| Topology | Boost, Current Mode |
| Vin (Min) (V) | 2.5 |
| Vin (Max) (V) | 5.5 |
| Iout (Max) (A) | 2 |
| Iq (Typ) (mA) | 0.9 |
| Features | I2C Control, Input/Output Isolation, LED Thermal Monitor, Load Disconnect During Shutdown, OVP, Over Current Protection, Synchronous Rectification |
| Operating temperature range (C) | -40 to 85 |
| Dimming method | Analog, PWM |
- 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
- ?40°C to +85°C Ambient Temperature Range
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.
