Texas Instruments LM2743

Description

The LM2743 is a high-speed synchronous buck regulator controller with an accurate feedback voltage accuracy of ±2%. It can provide simple downconversion to output voltages as low as 0.6V. Though the control sections of the IC are rated for 3 to 6V, the driver sections are designed to accept input supply rails as high as 16V. The use of adaptive non-overlapping MOSFET gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for the more costeffectiveoption of driving only N-channel MOSFETs in both the high-side and low-side positions. It senses the low-side switch voltage drop for providing asimple, adjustable current limit.The fixed-frequency voltage-mode PWM control architecture is adjustable from 50 kHz to 1 MHz with one external resistor. This wide range of switching frequency gives the power supply designer the flexibility to make better tradeoffs between component size, cost and efficiency.Features include soft-start, input under-voltage lockout (UVLO) and Power Good (based on both under-voltage and over-voltage detection). Inaddition, the shutdown pin of the IC can be used for providing startup delay, and the soft-start pin can be used for implementing precise tracking, for the purpose of sequencing with respect to an external rail.

Features

• Power Stage Input Voltage from 1V to 16V
• Control Stage Input Voltage from 3V to 6V
• Output Voltage Adjustable down to 0.6V
• Power Good Flag and Shutdown
• Output Over-Voltage and Under-Voltage Detection
• ±2% Feedback Voltage Accuracy Over Temperature
• Low-Side Adjustable Current Sensing
• Adjustable Soft-Start
• Tracking and Sequencing with Shutdown and Soft-Start Pins
• Switching Frequency from 50 kHz to 1 MHz
• TSSOP-14 Package

Typical applications

• 3.3V Buck Regulation
• DSP
• Ink Jet Printers
• Core and I/O
• ADSL
• ASIC
• DSL
• Laser Jet Printers
• Low Voltage Power Modules
• Cable Modem

More information

• Datasheet
• IC product information