LM3743

ACTIVE

High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features

Product details

Vin (min) (V) 3 Vin (max) (V) 5.5 Iout (max) (A) 10 Operating temperature range (°C) -40 to 125 Control mode Voltage mode Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 4.6 Features Enable, Pre-Bias Start-Up, Tracking Iq (typ) (µA) 1800 Duty cycle (max) (%) 91 Number of phases 1
Vin (min) (V) 3 Vin (max) (V) 5.5 Iout (max) (A) 10 Operating temperature range (°C) -40 to 125 Control mode Voltage mode Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 4.6 Features Enable, Pre-Bias Start-Up, Tracking Iq (typ) (µA) 1800 Duty cycle (max) (%) 91 Number of phases 1
VSSOP (DGS) 10 14.7 mm² 3 x 4.9
  • 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

All trademarks are the property of their respective owners.

  • 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

All trademarks are the property of their respective owners.

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.

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.

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Technical documentation

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Type Title Date
* Data sheet LM3743 High-Perf Synch Buck Cntrler w/Compreh Fault Protect Features datasheet (Rev. E) 04 Apr 2013
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
EVM User's guide AN-1450 LM3743 Evaluation Board (Rev. A) 07 May 2013
Application note LM3743 Hi Perf Controller w/Comp Fault Protect Feature for Hi Reliability System (Rev. A) 06 May 2013
Application note Power Supply Design Considerations for Modern FPGAs (Power Designer 121) 02 Feb 2010

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