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Linear Technology DC2479A-B Demo Manual

Ltm4650ey-1 dual phase single 50a dc/dc module regulator
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DESCRIPTION
Demonstration circuit 2479A-B features the
the high efficiency, high density, dual 25A, single 50A
switch mode step-down power module regulator. The
input voltage is from 4.5V to 15V. The output voltage is
programmable from 0.6V to 1.8V. DC2479A-B is configured
as dual-phase, single-output, which can deliver up to 50A
maximum. The board designs with minimum components
to demonstrate this high efficiency, high density µModule.
As explained in the data sheet, output current de-rating is
necessary for certain V
IN
BOARD PHOTO
LTM
4650EY-1,
®
, V
, and thermal conditions.
OUT
Figure 1. LTM4650-1/DC2479A-B Demo Board
DEMO MANUAL DC2479A-B
Dual Phase Single 50A
DC/DC μModule Regulator
These features and the availability of the LTM4650EY-1
in a compact 16mm × 16mm × 5.01mm BGA package
make it ideal for use in many high-density point-of-load
applications. The LTM4650-1 data sheet must be read
in conjunction with this demo manual for working on or
modifying the demo circuit DC2479A-B.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2479A-B
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LTM4650EY-1
dc2479abf
1

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Summary of Contents for Linear Technology DC2479A-B

  • Page 1 µModule. http://www.linear.com/demo/DC2479A-B As explained in the data sheet, output current de-rating is L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear necessary for certain V , and thermal conditions.

  • Page 2: Quick Start Procedure

    , See Figure 5 STEP QUICK START PROCEDURE Demonstration circuit DC2479A-B is easy to set up to voltage regulation, output voltage ripple, efficiency and evaluate the performance of the LTM4650EY-1. Please other parameters. Output ripple can be measured at J6 refer to Figure 1 for proper measurement setup and follow with BNC cables.
  • Page 3 DEMO MANUAL DC2479A-B QUICK START PROCEDURE – LOAD (0A ~ 50A) – dc2479ab F02 – – – 4.5V-15V Figure 2. Test Setup of DC2479A-B – Figure 3. Measuring Output Voltage Ripple dc2479abf...
  • Page 4 DEMO MANUAL DC2479A-B QUICK START PROCEDURE Efficiency at V = 12V, V = 1.0V LOAD CURRENT dc2479 F04 Figure 4. Efficiency vs Load Current at V = 12V, V = 1V, f = 500kHz (20MHz BW) [20mV/DIV, AC COUPLED] 25A – 37.5A LOAD STEP Figure 5.
  • Page 5 DEMO MANUAL DC2479A-B QUICK START PROCEDURE (20MHz BW) [5mV/DIV] Figure 6. Output Voltage Ripple at V = 12V, V = 1V, I = 50A, f = 500kHz Figure 7. Thermal Performance at V = 12V, V = 1V, I = 50A, T = 23.8°C, No Air Flow...

  • Page 6: Parts List

    DEMO MANUAL DC2479A-B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN1 CAP ., 150µF, 25V, Aluminum Electr., SUN ELECT., 25CE150AX CIN2, CIN3, CIN4, CIN5 CAP ., X5R, 22µF, 25V, 10%, 1210 MURATA, GRM32ER61E226KE15L COUT1, COUT3, COUT5, COUT7, CAP ., X5R, 330µF, 4V, 20%,1210...

  • Page 7: 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 8 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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