LM2742 Datasheet | Texas Instruments

.ti. SNVS266C - MARCH 2004 - REVISED MARCH 2013 LM2742 N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages Check for Samples: LM2742 Features - 2 Input Power from 1V to 16V - Output Voltage Adjustable down to 0.6V - Power Good Flag, Adjustable Soft-start and Output Enable for Easy Power Sequencing - Reference Accuracy: 1.5% (0°C- 125°C) - Current Limit Without Sense Resistor - Soft Start - Switching Frequency from 50 k Hz to 2 MHz - 40ns Typical Minimum On-time - TSSOP-14 Package APPLICATIONS - POL Power Supply Modules - Cable Modems - Set-Top Boxes/ Home Gateways - DDR Core Power - High-Efficiency Distributed Power - Local Regulation of Core Power DESCRIPTION The LM2742 is a high-speed, synchronous, switching regulator controller. It is intended to control currents of 0.7A to 20A with up to 95% conversion efficiencies. Power up and down sequencing is achieved with the power-good flag, adjustable soft-start and output enable Features . The LM2742 operates from a lowcurrent 5V bias and can convert from a 1V to 16V power rail. The part utilizes a fixed-frequency, voltage-mode, PWM control architecture and the switching frequency is adjustable from 50k Hz to 2MHz by setting the value of an external resistor. Current limit is achieved by monitoring the voltage drop across the on-resistance of the low-side MOSFET, which enables on-times on the order of 40ns, one of the best in the industry. The wide range of operating frequencies gives the power supply designer the flexibility to fine-tune ponent size, cost, noise and efficiency. The adaptive, nonoverlapping MOSFET gate-drivers and high-side bootstrap structure helps to further maximize efficiency. The high-side power FET drain voltage can be from 1V to 16V and the output voltage is adjustable down to 0.6V. TYPICAL APPLICATION +5V D1...