LM22674 / LM22674 -Q1 42V ， 500毫安SIMPLE SWITCHER®降压型稳压器与特点 LM22674/LM22674-Q1 42V, 500 mA SIMPLE SWITCHER® Step-Down Voltage Regulator with Features
The LM22674 switching regulator provides all of the functions necessary to implement an efficient high voltage step-down buck regulator using a minimum of external components. This easy to use regulator incorporates a 42 V N-channel MOSFET switch capable of providing up to 500 mA of load current. Excellent line and load regulation along with high efficiency > 90% are featured. Voltage mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5 V output and adjustable output voltage options are available. A switching frequency of 500 kHz allows for small external components and good transient response. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA typ. Built in soft-start 500 µs, typ saves external components. The LM22674 also has built in thermal shutdown, and current limiting to protect against accidental overloads.
The LM22674 device is a member of Texas Instruments SIMPLE SWITCHER® family. The SIMPLE SWITCHER® concept provides for an easy to use complete design using a minimum number of external components and the WEBENCH® design tool. TIs WEBENCH® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.
