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LM2655 Datasheet

  • LM2655

  • 2.5A High Efficiency Synchronous Switching Regulator

  • 17頁(yè)

  • NSC

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LM2655 2.5A High Efficiency Synchronous Switching Regulator
February 2000
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鈩? 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
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Ultra-high efficiency up to 96%
4V to 14V input voltage range
Internal high-side MOSFET with low R
DS(ON)
= 0.033鈩?/div>
300 kHz fixed frequency internal oscillator
Low-side drive for synchronous operation
Guaranteed less than 12 碌A(chǔ) shutdown current
Patented current sensing for current mode control
Programmable soft-start
Input undervoltage lockout
Output overvoltage shutdown protection
Output undervoltage shutdown protection
Thermal Shutdown
16-pin TSSOP package
Applications
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Hard disk drives
Internet appliances
TFT monitors
Computer peripherals
Battery powered devices
Typical Application
DS101284-29
漏 2000 National Semiconductor Corporation
DS101284
www.national.com

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