Part # LM2727 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2727 LM2737 N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages

Part Details:

LM2727/LM2737 June 2003 LM2727/LM2737N-Channel FET Synchronous Buck Regulator Controllerfor Low Output Voltages N-Channel General Description Features The LM2727 and LM2737 are high-speed, synchronous, n Input power from 2.2V to 16V switching regulator controllers. They are intended to control n Output voltage adjustable down to 0.6V currents of 0.7A to 20A with up to 95% conversion efficien- n Power Good flag, adjustable soft-start and output enable cies. The LM2727 employs output over-voltage and under- for easy power sequencing voltage latch-off. For applications where latch-off is not de- n Output over-voltage and under-voltage latch-off sired, the LM2737 can be used. Power up and down FET (LM2727) sequencing is achieved with the power-good flag, adjustable n Output over-voltage and under-voltage flag (LM2737) soft-start and output enable features. The LM2737 and n Reference Accuracy: 1.5% (0°C - 125°C) LM2737 operate from a low-current 5V bias and can convert Synchronous from a 2.2V to 16V power rail. Both parts utilize a fixed- n Current limit without sense resistor frequency, voltage-mode, PWM control architecture and the n Soft start switching frequency is adjustable from 50kHz to 2MHz by n Switching frequency from 50 kHz to 2 MHz adjusting the value of an external resistor. Current limit is n TSSOP-14 package achieved by monitoring the voltage drop across the on-resistance of the low-side MOSFET, which enhances low Applications duty-cycle operation. The wide range of operating frequen- n Cable Modems cies gives the power supply designer the flexibility to fine-tune component size, cost, noise and efficiency. The adap- n Set-Top Boxes/ Home Gateways tive, non-overlapping MOSFET gate-drivers and high-side n DDR Core Power Buck bootstrap structure helps to further maximize efficiency. The n High-Efficiency Distributed Power high-side power FET drain voltage can be from 2.2V to 16V n Local Regulation of Core Power and the output voltage is adjustable down to 0.6V. Regulator Typical Application Controller for Low Output 20049410 Voltages

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LM2727.pdf Datasheet