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LM2655 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM2655 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 16 page  LM2655 2.5A High Efficiency Synchronous Switching Regulator General Description The LM2655 is a current-mode controlled PWM step-down switching regulator. It has the unique ability to operate in synchronous or asynchronous mode. This gives the de- signer flexibility to choose between the high efficiency of synchronous operation, or the low solution cost of asynchro- nous operation. Along with flexibility, the LM2655 offers high power density with the small footprint of a TSSOP-16 pack- age. High efficiency (>90%) is obtained through the use of an in- ternal low ON-resistance (33m Ω) MOSFET, and an external N-Channel MOSFET. This feature, together with its low qui- escent current, makes the LM2655 an ideal fit in portable ap- plications. Integrated in the LM2655 are all the power, control, and drive functions for asynchronous operation. In addition, a low-side driver output allows easy synchronous operation. The IC uses patented current sensing circuitry that eliminates the external current sensing resistor required by other current- mode DC-DC converters. A programmable soft-start feature limits start up current surges and provides a means of se- quencing multiple power supplies. Features n Ultra-high efficiency up to 96% n 4V to 14V input voltage range n Internal high-side MOSFET with low R DS(ON) = 0.033Ω n 300 kHz fixed frequency internal oscillator n Low-side drive for synchronous operation n Guaranteed less than 12 µA shutdown current n Patented current sensing for current mode control n Programmable soft-start n Input undervoltage lockout n Output overvoltage shutdown protection n Output undervoltage shutdown protection n Thermal Shutdown n 16-pin TSSOP package Applications n Hard disk drives n Internet appliances n TFT monitors n Computer peripherals n Battery powered devices Typical Application DS101284-29 February 2000 © 2000 National Semiconductor Corporation DS101284 www.national.com |
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