LM3743

LM3743 www.ti.com SNVS427E – SEPTEMBER 2006 – REVISED APRIL 2013 LM3743 High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features Check for Samples: LM3743 FEATURES 1 2 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 DESCRIPTION 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 undervoltage 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 preb...