LM2745

LM2745, LM2748 www.ti.com SNOSAL2E – APRIL 2005 – REVISED APRIL 2013 LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock Synchronization Check for Samples: LM2745, LM2748 FEATURES 1 2 Switching Frequency from 50 kHz to 1 MHz Switching Frequency Synchronize Range 250 kHz to 1 MHz (LM2745 Only) 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 ±1.5% Feedback Voltage Accuracy Over Temperature Low-side Adjustable Current Sensing Adjustable Soft-start Tracking and Sequencing with Shutdown and Soft Start Pins TSSOP-14 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 LM2745/8 are high-speed synchronous buck regulator controllers with an accurate feedback voltage accuracy of ±1.5%. It can provide simple down conversion 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 14V. 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 costeffective option of driving only N-channel MOSFETs in...