LM20343 - 具有可调频率的 4.5-36V、3A 电流模式同步降压稳压器

LM20343是TI德州仪器公司的一款转换器（集成开关）产品，LM20343是具有可调频率的 4.5-36V、3A 电流模式同步降压稳压器，本站介绍了LM20343的封装应用图解、特点和优点、功能等，并给出了与LM20343相关的TI元器件型号供参考。

LM20343 - 具有可调频率的 4.5-36V、3A 电流模式同步降压稳压器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品描述

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.

产品特性

4.5V to 36V Input Voltage Range
3A Output Current, 5.2A Peak Current
130 m?/110 m? 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

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