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LM20343

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4.5-36V 3A 电流模式可调频率同步降压稳压器

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LM20343

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产品详情

Iout (max) (A) 3 Vin (min) (V) 4.5 Vin (max) (V) 36 Topology Buck Type Converter Switching frequency (min) (kHz) 250 Switching frequency (max) (kHz) 1000 Features Adjustable current limit, Enable, Over Current Protection, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Control mode current mode Vout (min) (V) 0.8 Vout (max) (V) 32 Rating Catalog Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0023
Iout (max) (A) 3 Vin (min) (V) 4.5 Vin (max) (V) 36 Topology Buck Type Converter Switching frequency (min) (kHz) 250 Switching frequency (max) (kHz) 1000 Features Adjustable current limit, Enable, Over Current Protection, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Control mode current mode Vout (min) (V) 0.8 Vout (max) (V) 32 Rating Catalog Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0023
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • 4.5V to 36V Input Voltage Range
  • 3A Output Current, 5.2A Peak Current
  • 130 mΩ/110 mΩ Integrated Power MOSFETs
  • 94% Peak Efficiency with Synchronous Rectification
  • 1.5% Feedback Voltage Accuracy
  • Current Mode Control, Selectable Compensation
  • Resistor Programmed, 1MHz Capable Oscillator
  • Adjustable Output Voltage Down to 0.8V
  • Compatible with Pre-biased Loads
  • Programmable Soft-start with External Capacitor
  • Precision Enable Pin with Hysteresis
  • OVP, UVLO Inputs and PGOOD Output
  • Internally Protected with Peak Current Limit, Thermal Shutdown and Restart
  • Accurate Current Limit Minimizes Inductor Size
  • Non-linear Current Mode Slope Compensation
  • 20-Pin HTSSOP Exposed Pad Package

All trademarks are the property of their respective owners.

  • 4.5V to 36V Input Voltage Range
  • 3A Output Current, 5.2A Peak Current
  • 130 mΩ/110 mΩ Integrated Power MOSFETs
  • 94% Peak Efficiency with Synchronous Rectification
  • 1.5% Feedback Voltage Accuracy
  • Current Mode Control, Selectable Compensation
  • Resistor Programmed, 1MHz Capable Oscillator
  • Adjustable Output Voltage Down to 0.8V
  • Compatible with Pre-biased Loads
  • Programmable Soft-start with External Capacitor
  • Precision Enable Pin with Hysteresis
  • OVP, UVLO Inputs and PGOOD Output
  • Internally Protected with Peak Current Limit, Thermal Shutdown and Restart
  • Accurate Current Limit Minimizes Inductor Size
  • Non-linear Current Mode Slope Compensation
  • 20-Pin HTSSOP Exposed Pad Package

All trademarks are the property of their respective owners.

The LM20343 is a full featured synchronous buck regulator capable of delivering up to 3A of load current. The current mode control loop is externally compensated with only two components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high voltage systems.

The device features internal Over Voltage Protection (OVP) and Over Current Protection (OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows the turn on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good (PGOOD) circuit.

The frequency of this device can be adjusted from 250 kHz to 1.0 MHz by connecting an external resistor from the RT pin to ground.

The LM20343 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20343 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20343 is offered in an exposed pad 20-pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.

The LM20343 is a full featured synchronous buck regulator capable of delivering up to 3A of load current. The current mode control loop is externally compensated with only two components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high voltage systems.

The device features internal Over Voltage Protection (OVP) and Over Current Protection (OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows the turn on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good (PGOOD) circuit.

The frequency of this device can be adjusted from 250 kHz to 1.0 MHz by connecting an external resistor from the RT pin to ground.

The LM20343 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20343 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20343 is offered in an exposed pad 20-pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.
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类型 标题 下载最新的英语版本 日期
* 数据表 LM20343 36V, 3A Adjustable Frequency Synchronous Buck Regulator 数据表 (Rev. B) 2013年 4月 3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
EVM 用户指南 AN-1792 LM20343 Evaluation Board (Rev. B) 2013年 5月 5日
应用手册 AN-2077 LM20k POL Module (Rev. A) 2013年 5月 3日

设计和开发

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评估板

LM20343EVAL — 用于 LM20343 的评估板

This evaluation board provides a solution to examine the full featured LM20343 buck switching regulator that is capable of driving up to 3A of load current. The device features a frequency adjust pin that allows the switching frequency to be adjusted from 250 kHz to 1.0 MHz. This board is capable (...)

用户指南: PDF
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LM20343DESIGN-CALC — LM20343 计算器电子表格

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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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