LM3485

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4.5 至 35V 滯環非同步 PFET 降壓控制器

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產品詳情

Rating Catalog Topology Buck Controller Iout (max) (A) 10 Vin (max) (V) 35 Vin (min) (V) 4.5 Vout (max) (V) 35 Vout (min) (V) 1.242 Control mode Hysteretic 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 Iout (max) (A) 10 Vin (max) (V) 35 Vin (min) (V) 4.5 Vout (max) (V) 35 Vout (min) (V) 1.242 Control mode Hysteretic 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 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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技術文檔

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類型 標題 下載最新的英語版本 日期
* 數據表 LM3485 Hysteretic PFET Buck Controller 數據表 (Rev. H) PDF | HTML 2015年 12月 28日
模擬設計期刊 控制模式快速參考指南 (Rev. B) PDF | HTML 英語版 (Rev.B) PDF | HTML 2023年 9月 5日
選擇指南 電源管理指南 2018 (Rev. K) 2018年 7月 31日
選擇指南 電源管理指南 2018 (Rev. R) 2018年 6月 25日
模擬設計期刊 Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016年 7月 21日
EVM 用戶指南 AN-1227 LM3485 Evaluation Board (Rev. B) 2013年 4月 25日
EVM 用戶指南 AN-1392 LM3485 LED Demo Board (Rev. B) 2013年 4月 25日
應用手冊 Application Note 1392 LM3485 LED Demo Board (cn) 2006年 6月 7日

設計和開發

如需其他信息或資源，請點擊以下任一標題進入詳情頁面查看（如有）。

評估板

LM3485EVAL — 滯后 PFET 降壓控制器評估模塊

Hysteretic PFET Buck Controller

用戶指南: PDF
TI.com 上無現貨
評估板

LM3485LED-EVAL — 滯后 PFET 降壓控制器

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 (...)

用戶指南: PDF
TI.com 上無現貨
仿真模型

LM3485 PSpice Transient Model

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

LM3485 Unencrypted PSpice Transient Model

SNVM716.ZIP (2 KB) - PSpice Model
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封裝 引腳 CAD 符號、封裝和 3D 模型
VSSOP (DGK) 8 Ultra Librarian

訂購和質量

包含信息：
  • RoHS
  • REACH
  • 器件標識
  • 引腳鍍層/焊球材料
  • MSL 等級/回流焊峰值溫度
  • MTBF/時基故障估算
  • 材料成分
  • 鑒定摘要
  • 持續可靠性監測
包含信息：
  • 制造廠地點
  • 封裝廠地點

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