The LM3553 is a fixed frequency, current mode step-up DC/DC converter with two regulated current sinks. The device is capable of driving loads up to 1.2A from a single-cell Li-Ion battery.

The LM3553 includes a TX pin that forces Torch mode during a flash event allowing for synchronization between the RF power amplifier and Flash/Torch modes. It also includes a multi-function pin (M/F) that can serve as a GPIO and a hardware RESET pin.

The LM3553 is available in a 3mm by 3mm package.

• Accurate and Programmable LED Current up to 1.2A in 128 Steps
• Total Solution Size < 30mm2
• 90% Peak Efficiency
• Drives 2 LEDs in Series with 1.2A from 5V Input
• Drives 2 LEDs in Series with 600mA from 3.0V Input
• Drives 1 LED with 1.2A from 3.0V Input
• Adjustable Over-Voltage Protection Allows for Single or Series LED Operation
• Four Operating Modes: Torch, Flash, Indicator, and Voltage Mode (4.98V)
• Programmable Flash Pulse Safety Timer in 16 Steps
• TX Input Ensures Synchronization with RF Power Amplifier Pulse or Prevents LED from Overheating
• LED Disconnect During Shutdown
• Flash/Imager Synchronization via FEN Pin
• Active Low Hardware Reset
• Multi-Function Pin (RESET and GPIO)
• Low Profile 12-pin WSON Package (DQB0012A: 3mm x 3mm x 0.8mm, 0.4mm pitch)

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• Input voltage (type)
• DC/DC
• Topology
• Boost, Current Mode
• Vin (Min) (V)
• 2.7
• Vin (Max) (V)
• 5.5
• Iout (Max) (A)
• 1.2
• Iq (Typ) (mA)
• 1
• Features
• I2C Control
• Operating temperature range (C)
• -30 to 85
• Dimming method
• Analog, PWM

LM3553的完整型号有：LM3553SD/NOPB、LM3553SDX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3553SD/NOPB，工作温度：-30 to 85，封装：WSON (DQB)-12，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM3553SD/NOPB的批量USD价格：0.686（1000+）

LM3553SDX/NOPB，工作温度：-30 to 85，封装：WSON (DQB)-12，包装数量MPQ：4500个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM3553SDX/NOPB的批量USD价格：0.572（1000+）

LM3553SDEV — 具有 I2C 兼容接口的 1.2A 双闪存 LED 驱动器系统

The LM3553 is a fixed frequency, current mode step-up DC/DC converter with two regulated current sinks. The device is capable of driving loads up to 1.2A from a single-cell Li-Ion battery.

One or more high current flash LEDs can be driven in series either in a high power Flash mode or a lower power (...)

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