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LM25085QMYE Arkusz danych(PDF) 1 Page - Texas Instruments

Numer części LM25085QMYE
Szczegółowy opis  LM25085, LM25085-Q1 42V Constant On-Time PFET Buck Switching Controller
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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LM25085QMYE Arkusz danych(HTML) 1 Page - Texas Instruments

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FB
LM25085
PGATE
ISEN
GND
VCC
ADJ
4.5V to 42V
Input
VIN
GND
SHUTDOWN
CIN
RT
CVCC
CADJ
RADJ
Q1
D1
L1
Cff
COUT
RFB2
RFB1
VOUT
GND
VIN
RT
LM25085, LM25085-Q1
www.ti.com
SNVS593H – OCTOBER 2008 – REVISED MARCH 2013
LM25085, LM25085-Q1 42V Constant On-Time PFET Buck Switching Controller
Check for Samples: LM25085, LM25085-Q1
1
FEATURES
PACKAGE
2
LM25085-Q1 is an Automotive Grade product
HVSSOP-8
that is AEC-Q100 Grade 1 Qualified (-40°C to
VSSOP-8
125°C Operating Junction Temperature)
WSON-8 (3mm x 3mm)
Wide 4.5V to 42V Input Voltage Range
Adjustable Current Limit Using RDS(ON) or a
DESCRIPTION
Current Sense Resistor
The LM25085 is a high efficiency PFET switching
regulator controller that can be used to quickly and
Programmable Switching Frequency to 1MHz
easily develop a small, efficient buck regulator for a
No Loop Compensation Required
wide
range
of
applications.
This
high
voltage
Ultra-Fast Transient Response
controller contains a PFET gate driver and a high
voltage bias regulator which operates over a wide
Nearly Constant Operating Frequency with
4.5V to 42V input range. The constant on-time
Line and Load Variations
regulation principle requires no loop compensation,
Adjustable Output Voltage from 1.25V
simplifies circuit implementation, and results in ultra-
Precision ±2% Feedback Reference
fast load transient response. The operating frequency
remains nearly constant with line and load variations
Capable of 100% Duty Cycle Operation
due to the inverse relationship between the input
Internal Soft-Start Timer
voltage and the on-time. The PFET architecture
Integrated High Voltage Bias Regulator
allows 100% duty cycle operation for a low dropout
voltage. Either the RDS(ON) of the PFET or an external
Thermal Shutdown
sense resistor can be used to sense current for over-
current detection.
Typical Application, Basic Step Down Controller
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 © 2008–2013, 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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