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LM25085 Arkusz danych(PDF) 1 Page - Texas Instruments

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

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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
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VIN
RT
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LM25085, LM25085-Q1
SNVS593J – OCTOBER 2008 – REVISED NOVEMBER 2014
LM25085 / -Q1 42V Constant On-Time PFET Buck Switching Controller
1 Features
3 Description
The LM25085 is a high efficiency PFET switching
1
LM25085-Q1 is an Automotive Grade product that
regulator controller that can be used to quickly and
is AEC-Q100 Grade 1 Qualified (-40°C to 125°C
easily develop a small, efficient buck regulator for a
Operating Junction Temperature)
wide
range
of
applications.
This
high
voltage
Wide 4.5V to 42V Input Voltage Range
controller contains a PFET gate driver and a high
voltage bias regulator which operates over a wide
Adjustable Current Limit Using RDS(ON) or a
4.5V to 42V input range. The constant on-time
Current Sense Resistor
regulation principle requires no loop compensation,
Programmable Switching Frequency to 1MHz
simplifies circuit implementation, and results in ultra-
No Loop Compensation Required
fast load transient response. The operating frequency
Ultra-Fast Transient Response
remains nearly constant with line and load variations
due to the inverse relationship between the input
Nearly Constant Operating Frequency with Line
voltage and the on-time. The PFET architecture
and Load Variations
allows 100% duty cycle operation for a low dropout
Adjustable Output Voltage from 1.25V
voltage. Either the RDS(ON) of the PFET or an external
Precision ±2% Feedback Reference
sense resistor can be used to sense current for over-
current detection.
Capable of 100% Duty Cycle Operation
Internal Soft-Start Timer
Device Information(1)
Integrated High Voltage Bias Regulator
PART NUMBER
PACKAGE
BODY SIZE (NOM)
Thermal Shutdown
LM25085-Q1
HVSSOP (8)
3.00 mm x 3.00 mm
VSSOP (8)
3.00 mm x 3.00 mm
2 Applications
LM25085
WSON (8)
3.00 mm x 3.00 mm
Automotive Infotainment
HVSSOP (8)
3.00 mm x 3.00 mm
Battery/Super Capacitor Chargers
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
LED Drivers
Simplified Schematic
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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