Linear Technology DC2166A Demo Manual
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Linear Technology DC2166A Demo Manual

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Description
Demonstration circuit 2166A features the
a 20A high efficiency, switch mode step-down power
µModule
regulator. The input voltage range is from
®
2.375V to 7V. The output voltage range is 0.6V to 5.5V.
Derating is necessary for certain V
thermal conditions. The DC2166A offers the TRACK/SS pin
allowing the user to program output tracking or soft-start
period. The board operates in continuous conduction mode
in heavy load conditions. For high efficiency at low load
currents, the MODE jumper (JP3) selects pulse-skipping
mode for noise sensitive applications or Burst Mode
operation in less noise sensitive applications. There is an
BoarD photo
Arrow.com.
Downloaded from
µModule Step-Down Regulator
LTM
4639EY,
®
, V
, frequency and
IN
OUT
®
DEMO MANUAL DC2166A
Low V
on board boost circuit using LT1935 to provide control
power to LTM4639 when V
has on board diode connected PNP transistors to monitor
its internal temperature. A temperature sensor LTC2997
converts the internal temperature to an analog voltage out-
put. The LTM4639 data sheet must be read in conjunction
with this demo manual prior to working on or modifying
demo circuit DC2166A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2166A
L, LT, LTC, LTM, µModule, Burst Mode, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
LTM4639
20A DC/DC
IN
is less than 4.5V. LTM4639
IN
dc2166af
1

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Summary of Contents for Linear Technology DC2166A

  • Page 1 Burst Mode ® L, LT, LTC, LTM, µModule, Burst Mode, Linear Technology and the Linear logo are registered operation in less noise sensitive applications. There is an trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Performance Summary

    156mV (Figure 4) STEP Quick start proceDure Demonstration circuit DC2166A is an easy way to evalu- 5. (Optional) For optional load transient test, apply an ate the performance of the LTM4639EY. Please refer to adjustable pulse signal between IOSTEP_CLK and GND Figure 1 for proper measurement equipment setup and test points.
  • Page 3 DEMO MANUAL DC2166A Quick start proceDure – – LOAD – Figure 1. Measurement Setup of DC2166A dc2166af Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...
  • Page 4 DEMO MANUAL DC2166A Quick start proceDure 100.0 95.0 90.0 85.0 80.0 75.0 70.0 = 1V = 1.2V = 1.5V 65.0 = 1.8V 60.0 10.0 15.0 20.0 LOAD CURRENT (A) Figure 2. Measured Efficiency at V = 3.3V, f = 500kHz, CCM 95.0...
  • Page 5 DEMO MANUAL DC2166A Quick start proceDure : 100mV/DIV : 13.3A/DIV OUT_STEP Figure 4. Measured Load Transient = 3.3V, V = 1.0V, I = 0A to 10A OUT1 STEP Figure 5. Thermal Image of LTM4639 = 3.3V, V = 1.8V, I...

  • Page 6: Parts List

    DEMO MANUAL DC2166A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C3, C5 CAP, 1210, 22µF, 10%, 16V, X5R MURATA GRM32ER61E226KE20L CAP, 150µF, 35V, ELEC SUN ELEC 35CE150AX CAP, 0603, 0.1µF, 10%, 50V, X7R TDK C1608X7R1H104K CAP, 0603, 180pF, 10%, 10V, X7R...

  • 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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