LM2679 - 具有可调节电流限制的 SIMPLE SWITCHER 5A 降压电压稳压器

LM2679是TI德州仪器公司的一款转换器（集成开关）产品，LM2679是具有可调节电流限制的 SIMPLE SWITCHER 5A 降压电压稳压器，本站介绍了LM2679的封装应用图解、特点和优点、功能等，并给出了与LM2679相关的TI元器件型号供参考。

LM2679 - 具有可调节电流限制的 SIMPLE SWITCHER 5A 降压电压稳压器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The LM2679 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 5A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3V, 5V and 12V and an adjustable output version.

The SIMPLE SWITCHER concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260KHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2679 are available from several manufacturers to greatly simplify the design process.

Other features include the ability to reduce the input surge current at power-ON by adding a softstart timing capacitor to gradually turn on the regulator. The LM2679 series also has built in thermal shutdown and resistor programmable current limit of the power MOSFET switch to protect the device and load circuitry under fault conditions. The output voltage is specified to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

产品特性

Efficiency Up to 92%
Simple and Easy to Design with (Using Off-The-Shelf External Components)
Resistor Programmable Peak Current Limit Over a Range of 3A to 7A.
120 mΩ DMOS Output Switch
3.3V, 5V and 12V Fixed Output and Adjustable (1.2V to 37V ) Versions
±2% Maximum Output Tolerance Over Full Line and Load Conditions
Wide Input Voltage Range: 8V to 40V
260 KHz Fixed Frequency Internal Oscillator
Softstart Capability
−40 to +125°C Operating Junction Temperature Range

SIMPLE SWITCHER is a trademark of Texas Instruments.

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