LM5085

ACTIVO

Controlador reductor PFET no síncrono, tiempo conexión constante, entrada amplia 4.5-75 V

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Hoja de datos

document-pdfAcrobat LM5085/-Q1 75-V Constant On-Time PFET Buck Switching Controller datasheet (Rev. I) (Inglés) PDF | HTML

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ACTIVO

Controlador reductor síncrono con rango de entrada amplio y baja IQ Optional spread spectrum for improved EMI.

LM5085

ACTIVO

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Detalles del producto

Rating

Catalog

Topology

Buck

Iout (max) (A)

10

Vin (max) (V)

75

Vin (min) (V)

4.5

Vout (max) (V)

75

Vout (min) (V)

1.25

Control mode

Constant on-time (COT)

Features

Adjustable current limit, Enable, Frequency synchronization

Duty cycle (max) (%)

100

Iq (typ) (A)

0.0013

Number of phases

1

Operating temperature range (°C)

-40 to 125

Rating

Catalog

Topology

Buck

Iout (max) (A)

10

Vin (max) (V)

75

Vin (min) (V)

4.5

Vout (max) (V)

75

Vout (min) (V)

1.25

Control mode

Constant on-time (COT)

Features

Adjustable current limit, Enable, Frequency synchronization

Duty cycle (max) (%)

100

Iq (typ) (A)

0.0013

Number of phases

1

Operating temperature range (°C)

-40 to 125

HVSSOP (DGN)

8

14.7 mm² (3 mm × 4.9 mm)

WSON (NGQ)

8

9 mm² (3 mm × 3 mm)

VSSOP (DGK)

8

14.7 mm² (3 mm × 4.9 mm)

LM5085-Q1 is an Automotive Grade Product that
is AEC-Q100 Grade 1 Qualified (–40°C to 125°C
Operating Junction Temperature)
Wide 4.5-V to 75-V 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 1.25 V
Precision ±2% Feedback Reference
Capable of 100% Duty Cycle Operation
Internal Soft-start Timer
Integrated High Voltage Bias Regulator
Thermal Shutdown
Package:
- HVSSOP-8
- VSSOP-8
- WSON-8

LM5085-Q1 is an Automotive Grade Product that
is AEC-Q100 Grade 1 Qualified (–40°C to 125°C
Operating Junction Temperature)
Wide 4.5-V to 75-V 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 1.25 V
Precision ±2% Feedback Reference
Capable of 100% Duty Cycle Operation
Internal Soft-start Timer
Integrated High Voltage Bias Regulator
Thermal Shutdown
Package:
- HVSSOP-8
- VSSOP-8
- WSON-8

The LM5085 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 4.5-V to 75-V input range. The constant on-time regulation principle requires no loop compensation, simplifies circuit implementation, and results in ultrafast 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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Documentación técnica

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Documentación principal	Tipo	Título	Opciones de formato
*	Hoja de datos	LM5085/-Q1 75-V Constant On-Time PFET Buck Switching Controller datasheet (Rev. I)	PDF \| HTML	12/08/2015
	Nota sobre la aplicación	Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B)		12/03/2019
	Artículo técnico	Crafty idea: Create a 150V non synchronous buck solution with a lower Vin rated co	PDF \| HTML	25/08/2017
	Analog Design Journal	Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics		21/07/2016
	Artículo técnico	How to design for EMC and isolation with Fly-Buck™ converters	PDF \| HTML	28/07/2015
	Nota sobre la aplicación	Transient Response versus Ripple – An Analysis of Ripple Injection Techniques		28/04/2014
	Informe	Wide VIN power management ICs simplify white paper (Rev. A)		19/09/2013
	Nota sobre la aplicación	Constant Current Constant Voltage Buck Converter w/LM25085 (Rev. A)		23/04/2013
	Nota sobre la aplicación	Designing Non-Invert Buck-Boost (Zeta) Cnvrts w/a Buck P-FET Cntrl		22/04/2011

Diseño y desarrollo

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Placa de evaluación

LM5085EVAL — Módulo de evaluación LM5085 de controlador reductor de conmutación PFET de tiempo de conexión consta

The LM5085 evaluation board provides the design engineer with a fully functional buck regulator, employing the LM5085 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 55V. The circuit (...)

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