Linear Technology LTM4650-1 Demo Manual
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Linear Technology LTM4650-1 Demo Manual

High efficiency, single 50a or dual 25a step-down power µmodule regulator
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Description
Demonstration circuit DC2378A-B features the
LTM
4650EY-1, 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. DC2378A-B
can deliver 25A maximum current from each channel. As
explained in the data sheet, output current derating is nec-
essary for certain V
board operates in continuous conduction mode in heavy
load conditions. For high efficiency at low load currents, the
MODE jumper (JP1) selects pulse-skipping mode for noise
sensitive applications or Burst Mode
noise sensitive applications. Two outputs can be connected
in parallel for a single 50A output solution with optional
jumper resistors. The board allows the user to program
Arrow.com.
Downloaded from
High Efficiency, Single 50A or Dual 25A
Step-Down Power µModule Regulator
, V
, and thermal conditions. The
IN
OUT
operation in less
®
Figure 1. LTM4650-1/DC2378A-B Demo Board
DEMO MANUAL DC2378A-B
how its output ramps up and down through the TRACK/
SS pin. The output can be set up to either coincidentally or
ratiometrically track with another supply's output. Remote
output voltage sensing is available for improved output
voltage regulation at the load point. These features and
the availability of the LTM4650EY-1 in a compact 15mm
× 15mm × 5.01mm BGA package make it ideal for use in
many high density point-of-load regulation applications.
The LTM4650-1 data sheet must be read in conjunction
with this demo manual for working on or modifying the
demo circuit DC2378A-B.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2378A-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.
LTM4650-1
dc2378abfa
1

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Summary of Contents for Linear Technology LTM4650-1

  • Page 1 50A output solution with optional L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks jumper resistors. The board allows the user to program of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Performance Summary

    CLKIN test point. and V supply to 12V. 7. (Optional) The outputs of LTM4650-1 can track another 3. Turn on the power supply at the input. The output supply. The jumpers JP4 and JP5 allow choosing soft- voltage in channel 1 should be 1.5V ±1.5% (1.4775V start or output tracking.
  • Page 3 DEMO MANUAL DC2378A-B Quick start proceDure Figure 2. Test Setup of DC2378A-B – Figure 3. Measuring Output Voltage Ripple dc2378abfa Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...
  • Page 4 DEMO MANUAL DC2378A-B Quick start proceDure , 1.5V , 1V , 1.5V , 1V OUTPUT LOAD CURRENT (A) OUTPUT LOAD CURRENT (A) dc2378aa F04 dc2378aa F05 Figure 4. Measured Efficiency on Channel 1 Figure 5. Measured Efficiency on Channel 2 = 1.5V, f = 500kHz, Channel 2 Disabled) = 1V, f...
  • Page 5 DEMO MANUAL DC2378A-B Quick start proceDure 1.5V OUTPUT (20MHz BW) [20mV/DIV] 1V OUTPUT (20MHz BW) [20mV/DIV] dc2378aa F08 dc2378aa F09 Figure 8. Measured Output Voltage Ripple at 12V Input, Figure 9. Measured Output Voltage Ripple at 12V Input, 1.5V/25A with Standard Demo Circuit Default Setup 1V/25A with Standard Demo Circuit Default Setup Figure 10.

  • Page 6: Parts List

    DEMO MANUAL DC2378A-B parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN1 CAP., ALUM. ELECT.,330µF, 25V, 20% PANASONIC, 25SVPF330M CIN2, CIN3, CIN4, CIN5 CAP., 22µF,X5R, 25V, 10%,1210 MURATA, GRM32ER61E226KE15L COUT9, COUT10, COUT12, COUT18 CAP., POSCAP, 470µF, 2.5V, 0.005Ω, 7343 PANASONIC, ETPF470M5H COUT2, COUT3, COUT4, COUT5, COUT6 CAP., 100µF, X5R, 6.3V, 20%, 1210 AVX, 12106D107MAT2A...
  • Page 7 DEMO MANUAL DC2378A-B parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CONN., HEADER, 2×3, 2mm WURTH ELEKTRONIK, 62000621121 XJP1, XJP2, XJP3, XJP4, XJP5 SHUNT, 2mm WURTH ELEKTRONIK, 60800213421 J1, J2, J3 CONN., BNC STR PCB JK, THRU- HOLE, 5 PINS CONNEX 112404 J4, J5 CONN., JACK, BANANA, NON-INSULATED, 0.218"...

  • Page 8: 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 9 DEMO MANUAL DC2378A-B schematic Diagram dc2378abfa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 10 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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