The LM22673 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 3 A 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. An adjustable soft-start feature is provided through the selection of a
single external capacitor. In addition, the switch current limit can be programmed with a single
external resistor, allowing solution optimization. The LM22673 device also has built-in thermal
shutdown, and current limiting to protect against accidental overloads.
The LM22673 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 TI 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.
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