LM3485

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4.5 至 35V 滞环非同步 PFET 降压控制器

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数据表

document-pdfAcrobat LM3485 Hysteretic PFET Buck Controller 数据表 (Rev. H) (英语) PDF | HTML

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LM25148

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具有超低 IQ 的 42V 同步降压直流/直流控制器 Improved EMI performance with QFN package and dual random spread spectrum.

LM3485

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数据表

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产品详情

Rating

Catalog

Topology

Buck Controller

Vin (max) (V)

35

Vin (min) (V)

4.5

Iout (max) (A)

4

Control mode

Hysteretic

Vout (max) (V)

35

Vout (min) (V)

1.242

Features

Enable

Operating temperature range (°C)

-40 to 125

Iq (typ) (µA)

250

Duty cycle (max) (%)

100

Number of phases

1

Rating

Catalog

Topology

Buck Controller

Vin (max) (V)

35

Vin (min) (V)

4.5

Iout (max) (A)

4

Control mode

Hysteretic

Vout (max) (V)

35

Vout (min) (V)

1.242

Features

Enable

Operating temperature range (°C)

-40 to 125

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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	类型	标题		下载最新的英语版本		日期
*	数据表	LM3485 Hysteretic PFET Buck Controller 数据表 (Rev. H)	PDF \| HTML			2015年 12月 28日
	模拟设计期刊	控制模式快速参考指南 (Rev. B)	PDF \| HTML	英语版 (Rev.B)	PDF \| HTML	2023年 9月 5日
	选择指南	电源管理指南 2018 (Rev. K)				2018年 7月 31日
	选择指南	电源管理指南 2018 (Rev. R)				2018年 6月 25日
	模拟设计期刊	Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics				2016年 7月 21日
	EVM 用户指南	AN-1227 LM3485 Evaluation Board (Rev. B)				2013年 4月 25日
	EVM 用户指南	AN-1392 LM3485 LED Demo Board (Rev. B)				2013年 4月 25日
	应用手册	Application Note 1392 LM3485 LED Demo Board (cn)				2006年 6月 7日

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LM3485EVAL — 滞后 PFET 降压控制器评估模块

Hysteretic PFET Buck Controller

用户指南: PDF

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LM3485LED-EVAL — 滞后 PFET 降压控制器

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 (...)

用户指南: PDF