The LM3549 is a high power LED driver with up to 700mA output current. It has three constant current LED drivers and a buck boost SMPS for driving RGB LEDs with high efficiency. LED drivers are designed for sequential drive so only one driver can be enabled at a time.

LED driver output current settings can be stored to integrated non-volatile memory which allows stand-alone operation without I²C interface. Non-volatile memory is rewritable so current setting can be changed if needed.

The LM3549 has a fault detection feature that can detect several different fault conditions. In case of a fault error flags are set and FAULT output sends interrupt to control logic. Error flags can be read through I²C interface.

Total brightness can be controlled with PWM input or with master fader register if I²C interface is used.

• Over-Current Protection
• Over-Temperature Protection
• I2C Compatible Interface
• Under-Voltage Lockout
• LED Open and Short Protection and Detection
• 95% Peak Efficiency Buck-Boost Converter
• NVM Memory for Calibration Data and Standalone Usage without I2C Control
• Soft Start

Key Specifications

• Integrated buck-boost Converter
• Programmable LED Drivers
• 700 mA Maximum Drive Current
• ±6% Current Accuracy Over Temperature
• 24-pin WQFN Package

All trademarks are the property of their respective owners.

• Number of channels (#)
• 3
• LED current per channel (mA)
• 235
• LED configuration
• Parallel
• Program memory
• Yes
• Programmable ramp control
• Yes
• Vin (Min) (V)
• 2.7
• Vin (Max) (V)
• 5.5
• Iout (Max) (A)
• 0.72
• Features
• I2C control
• Iq (Typ) (mA)
• 1.6
• Shutdown current (Typ) (uA)
• 1
• Operating temperature range (C)
• -30 to 85
• Rating
• Catalog

LM3549的完整型号有：LM3549SQ/NOPB、LM3549SQE/NOPB、LM3549SQX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3549SQ/NOPB，工作温度：-30 to 85，封装：WQFN (RTW)-24，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3549SQ/NOPB的批量USD价格：3.01（1000+）

LM3549SQE/NOPB，工作温度：-30 to 85，封装：WQFN (RTW)-24，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：SN，TI官网LM3549SQE/NOPB的批量USD价格：3.01（1000+）

LM3549SQX/NOPB，工作温度：-30 to 85，封装：WQFN (RTW)-24，包装数量MPQ：4500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3549SQX/NOPB的批量USD价格：2.508（1000+）

LM3549SQEVNOPB — LM3549 评估模块

The LM3549 is a high power LED driver with up to 700mA output current. It has three constant current LED drivers and a buck boost SMPS for driving RGB LEDs with high efficiency. LED drivers are designed for sequential drive so only one driver can be enabled at a time. LED driver output current (...)

PSPICE-FOR-TI — 适用于 TI 设计和模拟工具的 PSpice

PSpice for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence 的模拟分析引擎。PSpice for TI 可免费使用，包括业内超大的模型库之一，涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

借助?PSpice for TI 的设计和仿真环境及其内置的模型库，您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案，然后再进行布局和制造，可缩短产品上市时间并降低开发成本。

在?PSpice for TI 设计和仿真工具中，您可以搜索 TI (...)