LM2747 Datasheet | Texas Instruments

.ti. SNVS370B - MARCH 2006 - REVISED MARCH 2013 LM2747 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock Synchronization Check for Samples: LM2747 Features - 2 ±1% Feedback Voltage Accuracy Over Temperature - Switching Frequency from 50 k Hz to 1 MHz - Switching Frequency Synchronize Range 250 k Hz to 1 MHz - Startup with a Pre-Biased Output Load - Power Stage Input Voltage from 1V to 14V - Control Stage Input Voltage from 3V to 6V - Output Voltage Adjustable Down to 0.6V - Power Good Flag and Shutdown - Output Overvoltage and Undervoltage Detection - Low-Side Adjustable Current Sensing - Adjustable Soft-Start - Tracking and Sequencing with Shutdown and Soft Start Pins - 14-Pin TSSOP Package APPLICATIONS - Down Conversion from 3.3V - Cable Modem, DSL and ADSL - Laser Jet and Ink Jet Printers - Low Voltage Power Modules - DSP, ASIC, Core and I/O DESCRIPTION The LM2747 is a high-speed synchronous buck regulator controller with a feedback voltage accuracy of ±1%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control section of the IC is rated for 3 to 6V, the driver section is designed to accept input supply rails as high as 14V. The use of adaptive non-overlapping MOSFET gate drivers helps avoid potential shootthrough problems while maintaining high efficiency. The IC is designed for the more cost-effective option of driving only N-channel MOSFETs in both the highside and low-side positions. It senses the low-side switch voltage drop for providing a simple, adjustable current...