The LM3743 is a DC-DC voltage mode PWM buck controller featuring synchronous rectification at 300 kHz or 1 MHz. It can deliver current as high as 20A and step down from an input voltage between 3V and 5.5V down to a minimum output voltage of 0.8V, with a ±1.75% internal reference accuracy. The LM3743 provides a set of comprehensive fault protection features such as high-side current limit, output under-voltage protection, and low-side current limit. When any of these fault protection features are engaged, it enters a hiccup protection mode which is suitable for high reliability systems such as rack mounted servers and telecom base station subsystems. The LM3743 also employs a proprietary monolithic glitch free pre-bias start-up method suited for FPGA and ASIC logic devices. An external programmable soft-start allows for tracking and timing flexibility. The driver features 1.6? of pull-up resistance and 1? of pull-down drive resistance for high power density and very efficient power processing.

• Input Voltage From 3.0V to 5.5V
• Output Voltage Adjustable Down to 0.8V
• Reference Accuracy: ±1.75%, over Full Temperature and Input Voltage Range
• High-Side and Low-Side N-Channel MOSFETs
• Switching Frequency Options of 1 MHz or 300 kHz
• Comprehensive Fault Protection Features:
  • High-Side Current Limit
  • Low-Side Current Limit
  • Output Under-Voltage Protection
• Hiccup Mode Protection Eliminates Thermal Runaway During Fault Conditions
• Externally Programmable Soft-Start with Tracking Capability
• Pre-Bias Start-Up Capability
• VSSOP-10 Package

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• Vin (Min) (V)
• 3
• Vin (Max) (V)
• 5.5
• Vout (Min) (V)
• 0.8
• Vout (Max) (V)
• 4.6
• Iout (Max) (A)
• 10
• Iq (Typ) (uA)
• 1800
• Switching frequency (Min) (kHz)
• 300
• Switching frequency (Max) (kHz)
• 1000
• Features
• Enable, Pre-Bias Start-Up, Tracking
• Regulated outputs (#)
• 1
• Number of phases
• 1
• Rating
• Catalog

LM3743的完整型号有：LM3743MM-1000/NOPB、LM3743MM-300/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3743MM-1000/NOPB，工作温度：-40 to 125，封装：VSSOP (DGS)-10，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LM3743MM-1000/NOPB的批量USD价格：.748（1000+）

LM3743MM-300/NOPB，工作温度：-40 to 125，封装：VSSOP (DGS)-10，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LM3743MM-300/NOPB的批量USD价格：.748（1000+）

LM3743-1000EVAL — 用于低输出电压的 N 通道 FET 同步降压稳压器控制器

LM3743 N-Channel FET Synchronous Buck Controler for Low Output Voltages

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