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DESCRIPTION
Demonstration circuit 1238B features the LTM
36V 500mA step-down μModule
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.
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage
Maximum Continuous Output Current
Switching Frequency
BOARD PHOTO
Arrow.com.
Downloaded from
®
8021, a
®
regulator. The output has
(T
= 25°C)
A
CONDITIONS
V
= 5V
OUT
V
= 12V, I
IN
LOAD
DEMO MANUAL DC1238B
36V, 500mA Step-Down
µModule Regulator
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
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.
= 500mA, R1 = 19.1k
LTM8021
VALUE
7.5V to 36V
5V ±3%
500mA
1.1MHz
dc1238bf
1
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Related Manuals for Linear Technology DC1238B
Summary of Contents for Linear Technology DC1238B
- Page 1 The LTM8021 may need L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of more input voltage to start up than to run in steady state. Linear Technology Corporation. All other trademarks are the property of their respective owners.
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Page 2: Quick Start Procedure
DEMO MANUAL DC1238B QUICK START PROCEDURE Demonstration circuit 1238 is an easy way to evaluate the 3. Turn on the power at the input. performance of the LTM8021. Refer to figure 1 for proper NOTE. Make sure that the input voltage does not exceed measurement equipment setup and follow the procedure the maximum rated input voltage of the LTM8021. - Page 3 DEMO MANUAL DC1238B QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup dc1238b F02 Figure 2. Measuring Input or Output Voltage Ripple dc1238bf Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...
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Page 4: Parts List
DEMO MANUAL DC1238B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP., X5R, 4.7μF, 6.3V, 10%, 0603 AVX, 06036D475KAT2A CAP., X7R, 1μF, 50V, 10%, 0805 MURATA, GRM21BR71H105K RES., CHIP, 19.1k, 1/16W, 1% ,0402 VISHAY, CRCW040219K1FKED RES., CHIP, 0Ω, 1/16W, 1% ,0603 VISHAY, CRCW06030000Z0ED RES., CHIP, 51.1k 1/16W, 1% ,0603... -
Page 5: Schematic Diagram
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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