1
dc1238bf
DEMO MANUAL DC1238B
DESCRIPTION
LTM8021
36V, 500mA Step-Down
µModule Regulator
Demonstration circuit 1238B features the LTM
®
8021, a
36V 500mA step-down μModule
®
regulator. The output has
been preset to 5V by a single resistor within the LTM8021’s
output voltage range of 0.8V to 5V. An adjustable soft-start
period may be implemented with the addition of a capaci-
tor at C3. The input voltage range is from 7.5V to 36V for
the default operating conditions. The LTM8021 may need
more input voltage to start up than to run in steady state.
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
BOARD PHOTO
The data sheet gives a complete description of the part,
operation and applications information. The LTM8021 data
sheet must be read in conjunction with this demo manual
prior to working on or modifying demo circuit DC1238B.
Design files for this circuit board are available at
http://www.linear.com/demo
(T
A
= 25°C)
PARAMETER CONDITIONS VALUE
Input Voltage Range V
OUT
= 5V 7.5V to 36V
Output Voltage V
IN
= 12V, I
LOAD
= 500mA, R1 = 19.1k 5V ±3%
Maximum Continuous Output Current 500mA
Switching Frequency 1.1MHz
