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LM25011 bảng dữ liệu(PDF) 1 Page - Texas Instruments

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LM25011 bảng dữ liệu(HTML) 1 Page - Texas Instruments

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LM25011, LM25011-Q1
www.ti.com
SNVS617F – MAY 2009 – REVISED JANUARY 2011
LM25011, LM25011Q, LM25011A, LM25011AQ
42V 2A Constant On-Time Switching Regulator With Adjustable Current Limit
Check for Samples: LM25011, LM25011-Q1
1
FEATURES
2
LM25011Q is an Automotive Grade product
COT topology features:
that is AEC-Q100 grade 1 qualified (-40°C to
Switching frequency remains nearly
+125°C operating junction temperature)
constant with load current and input
LM25011A allows low dropout operation at
voltage variations
high switching frequency
Ultra-fast transient response
Input operating voltage range: 6V to 42V
No loop compensation required
Absolute maximum input rating: 45V
Stable operation with ceramic output
Integrated 2A N-Channel Buck Switch
capacitors
Adjustable current limit allows for smaller
Allows for smaller output capacitor and
inductor
current sense resistor
Adjustable output voltage from 2.51V
Adjustable Soft-Start timing
Minimum ripple voltage at VOUT
Thermal shutdown
Power Good output
Precision 2% feedback reference
Switching frequency adjustable to 2 MHz
Package
MSOP-10EP
DESCRIPTION
The LM25011 Constant On-time Step-Down Switching Regulator 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 detection, and internal ripple control. The
constant on-time regulation principle requires no loop compensation, results in fast load transient response, and
simplifies circuit implementation. 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 current 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
under-voltage lock-out, adjustable soft-start timing, thermal shutdown, gate drive pre-charge, gate drive under-
voltage lock-out, and maximum duty cycle limit.
The LM25011A has a shorter minimum off-time than the LM25011, which allows for higher frequency operation
at low input voltages.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2009–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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