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LM2655 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM2655
Description  2.5A High Efficiency Synchronous Switching Regulator
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM2655 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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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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