LM3485

활성

4.5~35V, 히스테리시스 비동기형 PFET 벅 컨트롤러

지금 주문

데이터시트

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

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대안 비교

다른 핀 출력을 지원하지만 비교 대상 장치와 동일한 기능

LM25148

활성

초저 IQ를 지원하는 42V 동기식 벅 DC/DC 컨트롤러 Improved EMI performance with QFN package and dual random spread spectrum.

LM3485

활성

데이터시트

지금 주문

제품 상세 정보

Vin (min) (V)

4.5

Vin (max) (V)

35

Iout (max) (A)

4

Operating temperature range (°C)

-40 to 125

Control mode

Hysteretic

Rating

Catalog

Vout (min) (V)

1.242

Vout (max) (V)

35

Iq (typ) (A)

0.00025

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

Rating

Catalog

Vout (min) (V)

1.242

Vout (max) (V)

35

Iq (typ) (A)

0.00025

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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기술 문서

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모두 보기6

	유형	직함		날짜
*	Data sheet	LM3485 Hysteretic PFET Buck Controller datasheet (Rev. H)	PDF \| HTML	2015/12/28
	Analog Design Journal	Control-Mode Quick Reference Guide (Rev. B)	PDF \| HTML	2023/08/29
	Selection guide	Power Management Guide 2018 (Rev. R)		2018/06/25
	Analog Design Journal	Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics		2016/07/21
	EVM User's guide	AN-1227 LM3485 Evaluation Board (Rev. B)		2013/04/25
	EVM User's guide	AN-1392 LM3485 LED Demo Board (Rev. B)		2013/04/25

설계 및 개발

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평가 보드

LM3485EVAL — 히스테리시스 PFET 벅 컨트롤러 평가 모듈

Hysteretic PFET Buck Controller

사용 설명서: PDF

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평가 보드

LM3485LED-EVAL — 히스테리시스 PFET 벅 컨트롤러

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 (...)

사용 설명서: PDF