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AC/DC & DC/DC controllers (external FET)

LM2642

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4.5V 至 30V 两相峰值电流模式同步降压控制器

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TPS51397A 正在供货 4.5V 至 24V 输入、10A 同步降压稳压器 Upgraded current rating with light-load efficiency and is soft start adjustable.

LM2642

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产品详情

Vin (min) (V) 4.5 Vin (max) (V) 30 Iout (max) (A) 6 Operating temperature range (°C) -40 to 125 Control mode current mode Rating Catalog Vout (min) (V) 1.238 Vout (max) (V) 27 Iq (typ) (A) 0.001 Duty cycle (max) (%) 98
Vin (min) (V) 4.5 Vin (max) (V) 30 Iout (max) (A) 6 Operating temperature range (°C) -40 to 125 Control mode current mode Rating Catalog Vout (min) (V) 1.238 Vout (max) (V) 27 Iq (typ) (A) 0.001 Duty cycle (max) (%) 98
TSSOP (PW) 28 62.08 mm² 9.7 x 6.4
  • Two Synchronous Buck Regulators
  • 180° Out of Phase Operation
  • 4.5V to 30V Input Range
  • Power Good Function Monitors Ch.1
  • 37µA Shutdown Current
  • 0.04% (typical) Line and Load Regulation Error
  • Current Mode Control With or Without a Sense Resistor
  • Independent Enable/Soft-start Pins Allow Simple Sequential Startup Configuration.
  • Configurable for Single Output Parallel Operation.
  • Adjustable Cycle-by-Cycle Current Limit
  • Input Under-voltage Lockout
  • Output Over-voltage Latch Protection
  • Output Under-voltage Protection with Delay
  • Thermal Shutdown
  • Self Discharge of Output Capacitors When the Regulator is OFF
  • TSSOP package

All trademarks are the property of their respective owners.

  • Two Synchronous Buck Regulators
  • 180° Out of Phase Operation
  • 4.5V to 30V Input Range
  • Power Good Function Monitors Ch.1
  • 37µA Shutdown Current
  • 0.04% (typical) Line and Load Regulation Error
  • Current Mode Control With or Without a Sense Resistor
  • Independent Enable/Soft-start Pins Allow Simple Sequential Startup Configuration.
  • Configurable for Single Output Parallel Operation.
  • Adjustable Cycle-by-Cycle Current Limit
  • Input Under-voltage Lockout
  • Output Over-voltage Latch Protection
  • Output Under-voltage Protection with Delay
  • Thermal Shutdown
  • Self Discharge of Output Capacitors When the Regulator is OFF
  • TSSOP package

All trademarks are the property of their respective owners.

The LM2642 consists of two current mode synchronous buck regulator controllers with a switching frequency of 300kHz.

The two switching regulator controllers operate 180° out of phase. This feature reduces the input ripple RMS current, thereby significantly reducing the required input capacitance. The two switching regulator outputs can also be paralleled to operate as a dual-phase single output regulator.

The output of each channel can be independently adjusted from 1.3 to VIN• maximum duty cycle. An internal 5V rail is also available externally for driving bootstrap circuitry.

Current-mode feedback control assures excellent line and load regulation and a wide loop bandwidth for excellent response to fast load transients. Current is sensed across either the Vds of the top FET or across an external current-sense resistor connected in series with the drain of the top FET. Current limit is independently adjustable for each channel.

The LM2642 features analog soft-start circuitry that is independent of the output load and output capacitance. This makes the soft-start behavior more predictable and controllable than traditional soft-start circuits.

A PGOOD1 pin is provided to monitor the dc output of channel 1. Over-voltage protection is available for both outputs. A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage event.

The LM2642 consists of two current mode synchronous buck regulator controllers with a switching frequency of 300kHz.

The two switching regulator controllers operate 180° out of phase. This feature reduces the input ripple RMS current, thereby significantly reducing the required input capacitance. The two switching regulator outputs can also be paralleled to operate as a dual-phase single output regulator.

The output of each channel can be independently adjusted from 1.3 to VIN• maximum duty cycle. An internal 5V rail is also available externally for driving bootstrap circuitry.

Current-mode feedback control assures excellent line and load regulation and a wide loop bandwidth for excellent response to fast load transients. Current is sensed across either the Vds of the top FET or across an external current-sense resistor connected in series with the drain of the top FET. Current limit is independently adjustable for each channel.

The LM2642 features analog soft-start circuitry that is independent of the output load and output capacitance. This makes the soft-start behavior more predictable and controllable than traditional soft-start circuits.

A PGOOD1 pin is provided to monitor the dc output of channel 1. Over-voltage protection is available for both outputs. A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage event.
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类型 标题 下载最新的英语版本 日期
* 数据表 LM2642 Two-Phase Synchronous Step-Down Switching Controller 数据表 (Rev. I) 2013年 4月 3日
用户指南 LM2642 评估板模块用户指南 (Rev. I) PDF | HTML 英语版 (Rev.I) PDF | HTML 2022年 7月 8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
应用手册 Application Note 1239 LM2642 Evaluation Board (cn) 2006年 3月 23日

设计和开发

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TSSOP (PW) 28 查看选项
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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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