The LM22672 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 1 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.
The default switching frequency is set at 500 kHz allowing for small external components
and good transient response. In addition, the frequency can be adjusted over a range of 200 kHz to
1 MHz with a single external resistor. The internal oscillator can be synchronized to a system
clock or to the oscillator of another regulator. A precision enable input allows simplification of
regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA
(typ). An adjustable soft-start feature is provided through the selection of a single external
capacitor. The LM22672 also has built in thermal shutdown, and current limiting to protect against
The LM22672 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.
TI's WEBENCH® tool includes features such as external component
calculation, electrical simulation, thermal simulation, and Build-It boards for easy