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DESCRIPTION
Demonstration circuit
DC1872A
a high efficiency, high density switch mode step-down
power µModule
regulator. The input voltage range is
®
from 4.5V to 20V. The output voltage is jumper pro-
grammable from 1.0V to 1.8V with a rated load current
of 20A. Derating is necessary for certain V
quency and thermal conditions. The DC1872A offers the
TRACK/SS pin, allowing the user to program output track-
ing or soft-start period. The DC1872A allows the user to
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage V
OUT
Maximum Continuous Output Current
Operating Frequency
Efficiency
Load Transient
BOARD PHOTO
features the
LTM
4637EV,
®
, V
, fre-
IN
OUT
CONDITIONS / NOTES
Jumper Selectable
Derating Is Necessary for Certain Operating
Conditions. See Data Sheet for Details
R
=124kΩ
fSET
V
= 12V, V
= 1.0V, I
IN
OUT
V
= 12V, V
= 1.0V
IN
OUT
DEMO MANUAL DC1872A
20A DC/DC µModule
Step-Down Regulator
choose pulse-skipping mode or Burst Mode
for higher efficiency at light load conditions.
The LTM4637 data sheet must be read in conjunction with
this demo manual prior to working on or modifying demo
circuit DC1872A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
VALUE
4.5V to 20V
1.0V, 1.2V, 1.5V, 1.8V ±1.5%
20ADC
520kHz
= 20A
82.2% See Figure 2
OUT
See Figure 3
LTM4637
operation
®
dc1872af
1
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Related Manuals for Linear Technology DC1872A
Summary of Contents for Linear Technology DC1872A
- Page 1 TRACK/SS pin, allowing the user to program output track- ing or soft-start period. The DC1872A allows the user to L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
- Page 2 DEMO MANUAL DC1872A QUICK START PROCEDURE Demonstration circuit DC1872A is an easy way to eva- 4. Vary the input voltage from 4.5V to 20V and adjust luate the performance of the LTM4637EV. Please refer to the load current from 0A to 20A. Observe the output...
-
Page 3: Quick Start Procedure
LOAD (A) LOAD (A) DC1872A F02b DC1872A F02d (2b) V = 1.2V (2d) V = 1.8V Figure 2. Measured DC1872A Efficiency at Different V and V Values (CCM Mode Enabled) 100mV/DIV OUT_STEP 6.67A/DIV DC1872A F03 Figure 3. Measured Load Transient Response Figure 4. -
Page 4: Parts List
DEMO MANUAL DC1872A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components IC, MICRO MODULE LINEAR TECH LTM4637EV C5, C24 CAP, 1210 22µF 10% 25V X5R MURATA GRM32ER61E226KE15L CAP, 150µF 35V ELEC SUN ELEC 35CE150AX CAP, 0603 0.1µF 10% 50V X7R... -
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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