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Linear Technology DC2479A-A Manual
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Linear Technology DC2479A-A Manual

Dual phase single 50a dc/dc μmodule regulator
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DESCRIPTION
Demonstration circuit 2479A-A 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-A is con-
figured 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
BOARD PHOTO
DEMO MANUAL DC2479A-A
DC/DC μModule Regulator
LTM
4650EY,
thermal conditions. These features and the availability of
®
the LTM4650EY in a compact 16mm × 16mm × 5.01mm
BGA package make it ideal for use in many high-density
point-of-load applications. The LTM4650 data sheet must
be read in conjunction with this demo manual for working
on or modifying the demo circuit DC2479A-A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2479A-A
, V
, and
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
IN
OUT
Technology Corporation. All other trademarks are the property of their respective owners.
Figure 1. LTM4650/DC2479A-A Demo Board
LTM4650EY
Dual Phase Single 50A
dc2479aaf
1

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Summary of Contents for Linear Technology DC2479A-A

  • Page 1 µModule. As explained in the data sheet, output current de-rating is necessary for certain V , and 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. BOARD PHOTO Figure 1.

  • Page 2: Quick Start Procedure

    , See Figure 5 STEP QUICK START PROCEDURE Demonstration circuit DC2479A-A is easy to set up to voltage regulation, output voltage ripple, efficiency and evaluate the performance of the LTM4650EY. Please refer other parameters. Output ripple can be measured at J6 to Figure 1 for proper measurement setup and follow the with BNC cables.
  • Page 3 DEMO MANUAL DC2479A-A QUICK START PROCEDURE – LOAD (0A ~ 50A) – dc2479aa F02 – – – 4.5V-15V Figure 2. Test Setup of DC2479A-A – Figure 3. Measuring Output Voltage Ripple dc2479aaf...
  • Page 4 DEMO MANUAL DC2479A-A QUICK START PROCEDURE 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 dc2479 F05 Figure 5. Measured 25A – 37.5A Load Transient Response (V = 12V, V = 1.0V, f...
  • Page 5 DEMO MANUAL DC2479A-A QUICK START PROCEDURE (20MHz BW) [10mV/DIV dc2479 F06 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-A 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 COUT2, COUT4, COUT6, COUT8 CAP ., 470µF, 2.5V, POSCAP , F8 SANYO-D4D PANASONIC, 2R5TPF470M6L CAP ., X5R, 2.2µF, 10V, 10%, 0603...

  • 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.