LM2747
www.ti.com SNVS370B MARCH 2006 REVISED MARCH 2013 LM2747 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock Synchronization
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1 FEATURES ±1% Feedback Voltage Accuracy Over Temperature Switching Frequency from 50 kHz to 1 MHz Switching Frequency Synchronize Range 250 kHz 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 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 limit. The LM2747 features a fixed-frequency voltage-mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with one external resistor. In addition, the LM2747 also allows the switching frequency to be synchronized to an external clock signal over the range of 250 kHz to 1 MHz. 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 the ability to startup with a prebiased load on the output, soft-start, input undervoltage lockout (UVLO) and Power Good (based on both undervoltage and overvoltage detection). In addition, 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. 2 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 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the …
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