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AC/DC 和 DC/DC 控制器 (外部 FET)

LM25085-Q1

現行

汽車級 4.5-42V 大範圍 Vin、恒定導通時間非同步 PFET 降壓控制器

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產品規格表

現在提供此產品的更新版本

open-in-new 比較替代產品
功能相同，但引腳輸出與所比較的裝置不同
LM25148-Q1 現行 具有超低 IQ 的車用 42-V 同步降壓 DC/DC 控制器 Improved EMI performance, efficiency and lower IQ.

LM25085-Q1

現行
產品規格表 立即訂購

產品詳細資料

Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 10 Operating temperature range (°C) -40 to 125 Control mode Constant on-time (COT) Topology Buck Controller Rating Automotive Vout (min) (V) 1.25 Vout (max) (V) 42 Features Adjustable current limit, Frequency synchronization Iq (typ) (µA) 1250 Duty cycle (max) (%) 100 Number of phases 1
Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 10 Operating temperature range (°C) -40 to 125 Control mode Constant on-time (COT) Topology Buck Controller Rating Automotive Vout (min) (V) 1.25 Vout (max) (V) 42 Features Adjustable current limit, Frequency synchronization Iq (typ) (µA) 1250 Duty cycle (max) (%) 100 Number of phases 1
HVSSOP (DGN) 8 14.7 mm² 3 x 4.9
  • LM25085-Q1 is an Automotive Grade product that is
    AEC-Q100 Grade 1 Qualified (–40°C to 125°C
    Operating Junction Temperature)
  • Wide 4.5V to 42V Input Voltage Range
  • Adjustable Current Limit Using RDS(ON) or a
    Current Sense Resistor
  • Programmable Switching Frequency to 1MHz
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Nearly Constant Operating Frequency with Line and
    Load Variations
  • Adjustable Output Voltage from 1.25V
  • Precision ±2% Feedback Reference
  • Capable of 100% Duty Cycle Operation
  • Internal Soft-Start Timer
  • Integrated High Voltage Bias Regulator
  • Thermal Shutdown
  • LM25085-Q1 is an Automotive Grade product that is
    AEC-Q100 Grade 1 Qualified (–40°C to 125°C
    Operating Junction Temperature)
  • Wide 4.5V to 42V Input Voltage Range
  • Adjustable Current Limit Using RDS(ON) or a
    Current Sense Resistor
  • Programmable Switching Frequency to 1MHz
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Nearly Constant Operating Frequency with Line and
    Load Variations
  • Adjustable Output Voltage from 1.25V
  • Precision ±2% Feedback Reference
  • Capable of 100% Duty Cycle Operation
  • Internal Soft-Start Timer
  • Integrated High Voltage Bias Regulator
  • Thermal Shutdown

The LM25085 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, efficient buck regulator for a wide range of applications. This high voltage controller contains a PFET gate driver and a high voltage bias regulator which operates over a wide 4.5V to 42V input range. The constant on-time regulation principle requires no loop compensation, simplifies circuit implementation, and results in ultra-fast load transient response. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The PFET architecture allows 100% duty cycle operation for a low dropout voltage. Either the RDS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.

The LM25085 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, efficient buck regulator for a wide range of applications. This high voltage controller contains a PFET gate driver and a high voltage bias regulator which operates over a wide 4.5V to 42V input range. The constant on-time regulation principle requires no loop compensation, simplifies circuit implementation, and results in ultra-fast load transient response. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The PFET architecture allows 100% duty cycle operation for a low dropout voltage. Either the RDS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.
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類型 標題 日期
* Data sheet LM25085 / -Q1 42V Constant On-Time PFET Buck Switching Controller datasheet (Rev. J) PDF | HTML 2014年 11月 3日
EVM User's guide AN-1905 LM25085 Evaluation Board (Rev. B) 2013年 4月 26日
Application note Constant Current Constant Voltage Buck Converter w/LM25085 (Rev. A) 2013年 4月 23日

設計與開發

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開發板

LM25085MYEVAL — 適用於 LM25085 - 42V 廣泛 Vin 固定導通時間 PFET 降壓切換控制器的評估板

The LM25085 evaluation board provides the design engineer with a fully functional buck regulator, employing the LM25085 PFET switching controller which uses the constant on-time (COT) operating principle. The evaluation board provides a 5V output over an input range of 5.5V to 42V. The circuit (...)

使用指南: PDF
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模擬型號

LM25085 PSpice Transient Model

SNVM302.ZIP (99 KB) - PSpice Model
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模擬型號

LM25085 Unencrypted PSpice Transient Model

SNVMAF8.ZIP (3 KB) - PSpice Model
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計算工具

LM25085-5085QUICK-CALC — LM(2)5085 快速入門計算機

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HVSSOP (DGN) 8 Ultra Librarian
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