LM25085

AKTIV

Konstant aktiver asynchroner PFET-Abwärtsregler, großer Eingangsspannungsbereich von 4,5–42 V

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Datenblatt

document-pdfAcrobat LM25085 / -Q1 42V Constant On-Time PFET Buck Switching Controller datasheet (Rev. J) (Englisch) PDF | HTML

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LM25085

AKTIV

Datenblatt

Jetzt bestellen

Produktdetails

Vin (min) (V)

4.5

Vin (max) (V)

42

Iout (max) (A)

10

Operating temperature range (°C)

-40 to 125

Control mode

Constant on-time (COT)

Topology

Buck Controller

Rating

Catalog

Vout (min) (V)

1.25

Vout (max) (V)

42

Features

Adjustable current limit, Enable, Frequency synchronization

Iq (typ) (µA)

1250

Duty cycle (max) (%)

100

Number of phases

1

Vin (min) (V)

4.5

Vin (max) (V)

42

Iout (max) (A)

10

Operating temperature range (°C)

-40 to 125

Control mode

Constant on-time (COT)

Topology

Buck Controller

Rating

Catalog

Vout (min) (V)

1.25

Vout (max) (V)

42

Features

Adjustable current limit, Enable, Frequency synchronization

Iq (typ) (µA)

1250

Duty cycle (max) (%)

100

Number of phases

1

HVSSOP (DGN)

8

14.7 mm² 3 x 4.9

VSSOP (DGK)

8

14.7 mm² 3 x 4.9

WSON (NGQ)

8

9 mm² 3 x 3

LM25085-Q1 is an Automotive Grade product that is
AEC-Q100 Grade 1 Qualified (–40°C to 125°C
Operating Junction Temperature)
Wide 4.5V to 42V Input Voltage Range
Adjustable Current Limit Using R_DS(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 1.25V
Precision ±2% Feedback Reference
Capable of 100% Duty Cycle Operation
Internal Soft-Start Timer
Integrated High Voltage Bias Regulator
Thermal Shutdown

LM25085-Q1 is an Automotive Grade product that is
AEC-Q100 Grade 1 Qualified (–40°C to 125°C
Operating Junction Temperature)
Wide 4.5V to 42V Input Voltage Range
Adjustable Current Limit Using R_DS(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 1.25V
Precision ±2% Feedback Reference
Capable of 100% Duty Cycle Operation
Internal Soft-Start Timer
Integrated High Voltage Bias Regulator
Thermal Shutdown

The LM25085 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 implementation, 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 R_DS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.

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Technische Dokumentation

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Alle anzeigen 6

	Typ	Titel		Datum
*	Data sheet	LM25085 / -Q1 42V Constant On-Time PFET Buck Switching Controller datasheet (Rev. J)	PDF \| HTML	03 Nov 2014
	Selection guide	Power Management Guide 2018 (Rev. R)		25 Jun 2018
	Application note	Transient Response versus Ripple – An Analysis of Ripple Injection Techniques		28 Apr 2014
	Application note	Automated Frequency Response Analyzer		09 Okt 2013
	EVM User's guide	AN-1905 LM25085 Evaluation Board (Rev. B)		26 Apr 2013
	Application note	Constant Current Constant Voltage Buck Converter w/LM25085 (Rev. A)		23 Apr 2013

Design und Entwicklung

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Evaluierungsplatine

LM25085MYEVAL — Evaluierungsplatine für LM25085 – PFET-Abwärts-Schalt-Controller mit 42 V, großem Vin und konstanter

The LM25085 evaluation board provides the design engineer with a fully functional buck regulator, employing the LM25085 PFET switching controller which uses the constant on-time (COT) operating principle. The evaluation board provides a 5V output over an input range of 5.5V to 42V. The circuit (...)

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