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LM3485

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4.5 至 35V 滞环非同步 PFET 降压控制器

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LM25148 正在供货 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.

产品详情

Vin (min) (V) 4.5 Vin (max) (V) 35 Vout (min) (V) 1.242 Vout (max) (V) 35 Iout (max) (A) 4 Iq (typ) (mA) 0.25 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 Control mode Hysteretic Type Controller
Vin (min) (V) 4.5 Vin (max) (V) 35 Vout (min) (V) 1.242 Vout (max) (V) 35 Iout (max) (A) 4 Iq (typ) (mA) 0.25 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 Control mode Hysteretic Type Controller
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 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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技术文档

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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

设计和开发

如需其他信息或资源,请点击以下任一标题进入详情页面查看(如有)。

评估板

LM3485EVAL — 滞后 PFET 降压控制器评估模块

Hysteretic PFET Buck Controller

用户指南: PDF
TI.com 上无现货
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 (...)

用户指南: PDF
TI.com 上无现货
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
模拟工具

PSPICE-FOR-TI — 适用于 TI 设计和模拟工具的 PSpice®

PSpice® for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence® 的模拟分析引擎。PSpice for TI 可免费使用,包括业内超大的模型库之一,涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

借助 PSpice for TI 的设计和仿真环境及其内置的模型库,您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案,然后再进行布局和制造,可缩短产品上市时间并降低开发成本。

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封装 引脚 下载
VSSOP (DGK) 8 查看选项

订购和质量

包含信息:
  • RoHS
  • 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
  • 鉴定摘要
  • 持续可靠性监测
包含信息:
  • 制造厂地点
  • 封装厂地点

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