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