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National Semiconductor Corporation - 2A Constant On-Time Switching Regulator

Numéro de référence LM25011
Description 2A Constant On-Time Switching Regulator
Fabricant National Semiconductor Corporation 
Logo National Semiconductor Corporation 





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LM25011 fiche technique
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LM25011
June 1, 2009
42V, 2A Constant On-Time Switching Regulator with
Adjustable Current Limit
General Description
The LM25011 Constant On-time Step-Down Switching Reg-
ulator features all the functions needed to implement a low
cost, efficient, buck bias regulator capable of supplying up to
2A of load current. This high voltage regulator contains an N-
Channel Buck switch, a startup regulator, current limit detec-
tion, and internal ripple control. The constant on-time
regulation principle requires no loop compensation, results in
fast load transient response, and simplifies circuit implemen-
tation. The operating frequency remains constant with line
and load. The adjustable valley current limit detection results
in a smooth transition from constant voltage to constant cur-
rent mode when current limit is reached, without the use of
current limit foldback. The PGD output indicates the output
voltage has increased to within 5% of the expected regulation
value. Additional features include: Low output ripple, VIN un-
der-voltage lock-out, adjustable soft-start timing, thermal
shutdown, gate drive pre-charge, gate drive under-voltage
lock-out, and maximum duty cycle limit.
Features
Input operating voltage range: 6V to 42V
Absolute maximum input rating: 45V
Integrated 2A N-Channel Buck Switch
Adjustable current limit
Adjustable output voltage from 2.51V
Minimum ripple voltage at VOUT
Power Good output
Switching frequency adjustable to 2 MHz
Switching frequency remains nearly constant with load
current and input voltage variations
Ultra-fast transient response
No loop compensation required
Stable operation with ceramic output capacitors
Adjustable Soft-Start timing
Thermal shutdown
Precision 2% feedback reference
Package
MSOP-10EP
Typical Application, Basic Step-Down Regulator
© 2009 National Semiconductor Corporation 300946
30094601
www.national.com

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