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National Semiconductor Electronic Components Datasheet

LM25085A Datasheet

42V Constant On-Time PFET Buck Switching Controller

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LM25085A pdf
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LM25085A
March 16, 2009
42V Constant On-Time PFET Buck Switching Controller
with 0.9V Reference
General Description
The LM25085A is a functional variant of the LM25085 COT
PFET Buck Switching Controller. The functional differences
of the LM25085A are: The feedback reference voltage is
0.9V, the forced off-time after current limit detection is longer,
and the soft-start time is shorter (1.8 ms).
The LM25085A is a high efficiency PFET switching regulator
controller that can be used to quickly and easily develop a
small, efficient buck regulator for a wide range of applications.
This high voltage controller contains a PFET gate driver and
a high voltage bias regulator which operates over a wide 4.5V
to 42V input range. The constant on-time regulation principle
requires no loop compensation, simplifies circuit implemen-
tation, and results in ultra-fast load transient response. The
operating frequency remains nearly constant with line and
load variations due to the inverse relationship between the
input voltage and the on-time. The PFET architecture allows
100% duty cycle operation for a low dropout voltage. Either
the RDS(ON) of the PFET or an external sense resistor can be
used to sense current for over-current detection.
Features
Wide 4.5V to 42V input voltage range
Adjustable current limit using RDS(ON) or a current sense
resistor
Programmable switching frequency to 1MHz
No loop compensation required
Ultra-Fast transient response
Nearly constant operating frequency with line and load
variations
Adjustable output voltage from 0.9V
Precision ±2% feedback reference
Capable of 100% duty cycle operation
Internal soft-start timer
Integrated high voltage bias regulator
Thermal shutdown
Package
MSOP-8EP
MSOP-8
LLP-8 (3 mm x 3 mm)
Typical Application, Basic Step Down Controller
© 2009 National Semiconductor Corporation 300852
30085201
www.national.com


National Semiconductor Electronic Components Datasheet

LM25085A Datasheet

42V Constant On-Time PFET Buck Switching Controller

No Preview Available !

LM25085A pdf
www.DataShCeeot4Un.cnomection Diagrams
Top View
8-Lead MSOP-EP
30085202
Top View
8-Lead LLP
30085204
Top View
8-Lead MSOP
Ordering Information
Order Number
Package Type
LM25085AMYE
LM25085AMY
LM25085AMYX
LM25085AMME
LM25085AMM
LM25085AMMX
LM25085ASDE
LM25085ASD
LM25085ASDX
MSOP-8EP
MSOP-8EP
MSOP-8EP
MSOP-8
MSOP-8
MSOP-8
LLP-8
LLP-8
LLP-8
30085203
NSC Package Drawing
MUY08A
MUY08A
MUY08A
MUA08A
MUA08A
MUA08A
SDA08A
SDA08A
SDA08A
Junction Temperature
Range
-40°C to +125°C
Supplied As
250 units on tape and reel
1000 units on tape and reel
3500 units on tape and reel
250 units on tape and reel
1000 units on tape and reel
3500 units on tape and reel
250 units on tape and reel
1000 units on tape and reel
4500 units on tape and reel
www.national.com
2


Part Number LM25085A
Description 42V Constant On-Time PFET Buck Switching Controller
Maker National Semiconductor
Total Page 24 Pages
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