LM3559是TI公司的一款相机闪光灯LED驱动器产品，LM3559是Synchronous Boost Flash Driver with Dual 900 mA High Side Current Sources (1.8A Total Flash Current，本页介绍了LM3559的产品说明、应用、特性等，并给出了与LM3559相关的TI元器件型号供参考。
LM3559 - Synchronous Boost Flash Driver with Dual 900 mA High Side Current Sources (1.8A Total Flash Current - 相机闪光灯LED驱动器 - LED驱动器 - TI公司（Texas Instruments，德州仪器）
The LM3559 is a 2MHz fixed-frequency synchronous boost converter with two 900 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 of up to 1.8A. An adaptive regulation method ensures the current for each LED remains in regulation and maximizes efficiency.
The LM3559 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, an integrated comparator designed to monitor an NTC thermistor and provide an interrupt to the LED current, an input voltage monitor to monitor low battery conditions, and a flash current scale-back feature that actively monitors the battery voltage and optimizes the flash current during low battery voltage conditions. 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 or 2.2 µH) inductors and (10 µF) ceramic capacitors. The device is available in a ultra-small 16-bump 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 28.125mA to 1.8A
- Optimized Flash Current During Low Battery Conditions
- Independent LED Current Source Programmability
- >90% Efficiency
- Ultra-Small (Total) Solution Size: <26mm2
- Four Operating Modes: Torch, Flash, Privacy Indicate, and Message Indicator
- 4-Bit ADC for VLED Monitoring
- Battery Voltage Sensing and Current Scale-Back
- 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 DSBGA
