LM3485

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Controlador reductor PFET no síncrono histerético de 4.5 V a 35 V

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Hoja de datos

document-pdfAcrobat LM3485 Hysteretic PFET Buck Controller datasheet (Rev. H) (Inglés) PDF | HTML

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Controlador CC/CC reductor síncrono de 42 V con IQ ultrabaja Improved EMI performance with QFN package and dual random spread spectrum.

LM3485

ACTIVO

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Detalles del producto

Vin (min) (V)

4.5

Vin (max) (V)

35

Iout (max) (A)

4

Operating temperature range (°C)

-40 to 125

Control mode

Hysteretic

Topology

Buck Controller

Rating

Catalog

Vout (min) (V)

1.242

Vout (max) (V)

35

Features

Enable

Iq (typ) (µA)

250

Duty cycle (max) (%)

100

Number of phases

1

Vin (min) (V)

4.5

Vin (max) (V)

35

Iout (max) (A)

4

Operating temperature range (°C)

-40 to 125

Control mode

Hysteretic

Topology

Buck Controller

Rating

Catalog

Vout (min) (V)

1.242

Vout (max) (V)

35

Features

Enable

Iq (typ) (µA)

250

Duty cycle (max) (%)

100

Number of phases

1

VSSOP (DGK)

8

14.7 mm² 3 x 4.9

Easy-to-Use Control Methodology
No Control-Loop Compensation Required
4.5-V to 35-V Wide Input Range
1.242-V to V_IN Adjustable Output Range
High Efficiency 93%
±1.3% (±2% Over Temp) Internal Reference
100% Duty Cycle
Maximum Operating Frequency > 1 MHz
Current Limit Protection

Easy-to-Use Control Methodology
No Control-Loop Compensation Required
4.5-V to 35-V Wide Input Range
1.242-V to V_IN Adjustable Output Range
High Efficiency 93%
±1.3% (±2% Over Temp) Internal Reference
100% Duty Cycle
Maximum Operating Frequency > 1 MHz
Current Limit Protection

The LM3485 is a high-efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, low-cost, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control-loop stability concerns using a wide variety of external components. The PFET architecture also allows for low component count as well as ultralow dropout, 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple.

Current limit protection is provided by measuring the voltage across the R_DS(ON) of the PFET, thus eliminating the need for a sense resistor. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents.

The LM3485 is a high-efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, low-cost, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control-loop stability concerns using a wide variety of external components. The PFET architecture also allows for low component count as well as ultralow dropout, 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple.

Current limit protection is provided by measuring the voltage across the R_DS(ON) of the PFET, thus eliminating the need for a sense resistor. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents.

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Documentación técnica

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	Tipo	Título		Fecha
*	Data sheet	LM3485 Hysteretic PFET Buck Controller datasheet (Rev. H)	PDF \| HTML	28 dic 2015
	Analog Design Journal	Control-Mode Quick Reference Guide (Rev. B)	PDF \| HTML	29 ago 2023
	Selection guide	Power Management Guide 2018 (Rev. R)		25 jun 2018
	Analog Design Journal	Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics		21 jul 2016
	EVM User's guide	AN-1227 LM3485 Evaluation Board (Rev. B)		25 abr 2013
	EVM User's guide	AN-1392 LM3485 LED Demo Board (Rev. B)		25 abr 2013

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

LM3485EVAL — Módulo de evaluación de controlador reductor PFET histerético

Hysteretic PFET Buck Controller

Guía del usuario: PDF

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Placa de evaluación

LM3485LED-EVAL — Controlador reductor PFET histerético

The LM3485 LED driver board is a buck regulator derived controlled current source designed to drive high power, high brightness LEDs (HBLEDs) such as the Luxeon™ Emitter at dissipations of 1W to 5W. The board can accept an input voltage ranging from 5V to 30V and can control the output current (...)

Guía del usuario: PDF