Linear Technology LTM4620A Demo Manual
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Linear Technology LTM4620A Demo Manual

Dual 13a or single 26a ?module regulator
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Description
Demonstration circuit 2268A-B is a high efficiency, high
density, dual 13A, switch mode step-down power supply
on a compact 1.5' × 1.2' PCB. It features the
μModule regulator. The input voltage is from 5.5V to
16V. The output voltage is programmable from 0.6V to
5V. DC2268A-B can deliver up to 13A maximum in each
channel. As explained in the data sheet, output current
derating is necessary for certain V
conditions. The board operates in continuous conduction
mode in heavy load conditions. For high efficiency at low
load currents, the resistor jumper (R1/R2) selects pulse-
skipping mode for noise sensitive applications or Burst
Mode
in less noise sensitive applications. Two outputs can
®
be connected in parallel for a single 26A output solution
with optional jumper resistors. The board allows the user
to program how its output ramps up and down through
BoarD photo
DEMO MANUAL DC2268A-B
LTM4620A
, V
, and thermal
IN
OUT
Figure 1. LTM4620A/DC2268A-B Demo Board
Dual 13A or Single 26A
μModule Regulator
the TRACK/SS pin. Remote output voltage sensing is
available for improved output voltage regulation at the load
point. An optional input inductor L1 reduces the EMI noise
for noise sensitive applications. DC2268A can be easily
inserted to an edge connector for testing and debugging.
These features and the availability of the LTM4620A in a
compact 16mm × 16mm × 5.01mm BGA package make
it ideal for use in many high-density point-of-load regula-
tion applications. The LTM4620A data sheet must be read
in conjunction with this demo manual for working on or
modifying the demo circuit DC2268A-B.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2268A-B
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
LTM4620A
dc2268abfa
1

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Summary of Contents for Linear Technology LTM4620A

  • Page 1 26A output solution with optional jumper resistors. The board allows the user L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective to program how its output ramps up and down through owners.

  • Page 2: Performance Summary

    Demonstration circuit DC2268A-B is easy to set up to 4. Once the proper output voltage is established, adjust the evaluate the performance of the LTM4620A. It can be load within the operating range and observe the output easily inserted to an edge connector (SAMTEC MEC2- voltage regulation, output voltage ripple, efficiency and 20-01-L-DV--TR) for testing and debugging.

  • Page 3: Output Current

    DEMO MANUAL DC2268A-B Quick start proceDure Table 2. DC2268A Demo Circuit DEMO BOARD NUMBER µMODULE REGULATOR ON THE BOARD OUTPUT CURRENT DC2268A-A LTM4620 13A,13A DC2268A-B LTM4620A 13A,13A DC2268A-C LTM4628 8A, 8A DC2268A-D LTM4630 18A,18A DC2268A-E LTM4630-1 18A,18A DC2268A-F LTM4630A 18A, 18A...
  • Page 4 DEMO MANUAL DC2268A-B Quick start proceDure Efficiency, 3.3V Efficiency, 5V = 12V = 750kHz 93.9 93.5 92.4 92 92 91.9 93.9 91.6 93.7 91.4 90.4 91.8 90.2 91.8 89.1 91.1 87.5 84.6 = 12V 77.4 = 750kHz 75.2 12 13 LOAD LOAD dc2268ab F03...
  • Page 5 DEMO MANUAL DC2268A-B Quick start proceDure 5V OUTPUT (20MHz BW) [20mV/DIV] 6.5A TO 13A LOAD STEP dc2268ab F06 Figure 6. Measured Channel 2 6.5A to 13A Load Transient (V = 12V, V = 5V) OUT2 Figure 7. Thermal Performance at V = 12V, V = 3.3V/8A, OUT1...

  • Page 6: Parts List

    DEMO MANUAL DC2268A-B parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN1, CIN2, CIN3, CIN4, CIN5, CIN6 CAP, 1210 22µF 10% 25V X5R AVX 12103D226KAT2A CO1, CO5 CAP, 7343 330µF 20% 6.3V POSCAP PANASONIC 6TPF330M9L CO2, CO3, CO4, CO6 CAP, 1210 100µF 10% 6.3V X5R AVX 12106D107KAT2A CAP, 0603 4.7µF 20% 6.3V X5R...

  • 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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