The LM22676 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. 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 LM22676 also has built in thermal shutdown, and
current limiting to protect against accidental overloads.
The LM22676 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
design-in.
