The LM3561 is a 2-MHz fixed-frequency current-mode synchronous boost converter. The device is designed to operate as a single 600-mA constant current driver for high-current white LEDs. The high-side current source allows for grounded cathode LED operation while the 250-mV regulated headroom voltage ensures that the LED current is well regulated and efficiency remains high.

The main features of the LM3561 include: an I²C-compatible interface for controlling the LED current, a hardware Flash enable input for direct triggering of the Flash pulse, dual TX inputs (TX1 and TX2) which force the Flash pulse into a low-current Torch mode during high battery current instances, an active high hardware enable (HWEN) allowing for fast hardware shutdown during system software failures, a dual mode pin which serves as either an indicator LED driver at up to 18mA or as a dedicated comparator input with an internal 1V reference, designed to monitor the voltage across a negative temperature coefficient thermistor (NTC), and a programmable input voltage monitor which monitors IN and can reduce the flash current or shutdown the device during low battery conditions.

Seven fault flags are available for read back over the I²C-compatible bus. These include: a flash timeout flag indicating the flash pulse has reached the end of the programmable timeout duration, a thermal shutdown flag indicating the LM3561's die temperature has exceeded 150°C, an LED fault flag indicating the output voltage has tripped the over-voltage threshold, or the LED has become shorted, TX1 and TX2 interrupt flags indicating if either of the TX inputs have been triggered, an NTC flag indicating the LED has experienced an over temperature condition, and a VIN Monitor flag indicating the input voltage has fallen below the VIN Monitor threshold.

The LM3561 is available in a tiny (1.215mm × 1.615mm × 0.6mm) 12-bump DSBGA and operates over the temperature range -40°C to +85°C.

• High-Side Current Source Allows Grounded LED Cathode
• Up to 90% Efficient
• Ultra-Small Solution Size: <16mm2
• Three Operating Modes: Torch, Flash, and LED Indicator
• Accurate and Programmable LED Current from 18mA to 600mA
• Hardware Flash and Torch Enable
• LED Thermal Sensing and Current Scaleback
• Software Selectable Input Voltage Monitor
• Programmable Flash Timeout
• Dual Synchronization Inputs for RF Power Amplifier Pulse Events
• Open and Short LED Detection
• Active High Hardware Enable for Protection Against System Faults
• 400kHz I2C-compatible Interface
• 12-Bump (1.215mm × 1.615mm × 0.6mm) DSBGA Package

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• Input voltage (type)
• DC/DC
• Topology
• Boost, Current Mode
• Vin (Min) (V)
• -0.3
• Vin (Max) (V)
• 6
• Iout (Max) (A)
• 0.6
• Iq (Typ) (mA)
• 0.676
• Features
• I2C Control, OVP
• Operating temperature range (C)
• -40 to 85
• Dimming method
• Analog, PWM

LM3561的完整型号有：LM3561TME/NOPB、LM3561TMX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3561TME/NOPB，工作温度：-40 to 85，封装：DSBGA (YFQ)-12，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3561TME/NOPB的批量USD价格：0.581（1000+）

LM3561TMX/NOPB，工作温度：-40 to 85，封装：DSBGA (YFQ)-12，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3561TMX/NOPB的批量USD价格：0.484（1000+）

LM3561EVM — LM3561EVM 600mA 单个 LED 驱动器评估板

The LM3561EVM is a complete demonstration system for the LM3561 600mA Single LED Driver. The LM3561EVM consists of an evaluation board, a USB Interface module, and downloadable software. Communication from PC to device is via the downloadable software and the included USB2ANY USB Interface Board. (...)

GUI Software for LM3561

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