产品详细信息

Vin (Min) (V) 4.5 Vin (Max) (V) 35 Vout (Min) (V) 1.242 Vout (Max) (V) 35 Iout (Max) (A) 4 Iq (Typ) (uA) 250 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 1000 Features Enable Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Number of phases 1 Rating Catalog
Vin (Min) (V) 4.5 Vin (Max) (V) 35 Vout (Min) (V) 1.242 Vout (Max) (V) 35 Iout (Max) (A) 4 Iq (Typ) (uA) 250 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 1000 Features Enable Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Number of phases 1 Rating Catalog
VSSOP (DGK) 8 15 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 VIN 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 VIN 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 RDS(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 RDS(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 项目标题 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 28 Dec 2015
选择指南 电源管理指南 2018 (Rev. K) 31 Jul 2018
选择指南 电源管理指南 2018 (Rev. R) 25 Jun 2018
选择指南 Control-Mode Quick Reference Guide (Rev. A) 14 Sep 2017
模拟设计期刊 Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
EVM 用户指南 AN-1227 LM3485 Evaluation Board (Rev. B) 25 Apr 2013
EVM 用户指南 AN-1392 LM3485 LED Demo Board (Rev. B) 25 Apr 2013
应用手册 Application Note 1392 LM3485 LED Demo Board (cn) 07 Jun 2006

设计和开发

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评估板

LM3485EVAL — 滞后 PFET 降压控制器评估模块

Hysteretic PFET Buck Controller

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评估板

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 (...)

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仿真模型

LM3485 PSpice Transient Model

SNVM296.ZIP (44 KB) - PSpice Model
仿真模型

LM3485 Unencrypted PSpice Transient Model

SNVM716.ZIP (2 KB) - PSpice Model
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VSSOP (DGK) 8 了解详情

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  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 认证摘要
  • 持续可靠性监测

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