5A SIMPLE SWITCHER, Step-Down Voltage Regulator with Adjustable Soft-Start & Current Limit

The LM22679

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 that can provide up to 5 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 LM22679 device also has built-in

thermal shutdown and current limiting to protect against

accidental overloads.

The new product,

LM61460, offers higher efficiency, lower stand-by

quiescent current, and improved EMI performance. See the device comparison table to compare. Start WEBENCH design with LM61460

The LM22679 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. TI’s WEBENCH tool includes features such as external

component calculation, electrical simulation, thermal simulation, and Build-It boards for

easy design-in.