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High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features

Replaced by: LM21212MH-1/NOPB

US ECCN: EAR99 US/Local Export Classification Number

Inventory: 20,000  

Quality information

RoHS Yes
Lead finish / Ball material SN
MSL rating / Peak reflow Level-1-260C-UNLIM
Quality, reliability
& packaging information

Information included:

  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
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Packaging information

Package | Pins Package qty | Carrier: Operating temperature range (°C)
VSSOP (DGS) | 10 1,000 | SMALL T&R
-40 to 125
Package | Pins VSSOP (DGS) | 10
Package qty | Carrier: 1,000 | SMALL T&R
Operating temperature range (°C) -40 to 125
View TI packaging information

Features for the LM3743

  • 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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Description for the LM3743

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 1.6Ω of pull-up resistance and 1Ω of pull-down drive resistance for high power density and very efficient power processing.


Qty Price (USD)
1-99 1.523
100-249 1.258
250-999 0.904
1,000+ 0.68