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LM2742 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM2742 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 22 page  LM2742 N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages General Description The LM2742 is a high-speed, synchronous, switching regu- lator 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 low-current 5V bias and can con- vert 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 50kHz 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 de- signer the flexibility to fine-tune component size, cost, noise and efficiency. The adaptive, non-overlapping MOSFET gate-drivers and high-side bootstrap structure helps to fur- ther 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. Features n Input power from 1V to 16V n Output voltage adjustable down to 0.6V n Power Good flag, adjustable soft-start and output enable for easy power sequencing n Reference Accuracy: 1.5% (0˚C - 125˚C) n Current limit without sense resistor n Soft start n Switching frequency from 50 kHz to 2 MHz n 40ns typical minimum on-time n TSSOP-14 package Applications n POL power supply modules n Cable Modems n Set-Top Boxes/ Home Gateways n DDR Core Power n High-Efficiency Distributed Power n Local Regulation of Core Power Typical Application 20087510 PRELIMINARY March 2004 © 2004 National Semiconductor Corporation DS200875 www.national.com |
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