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Description
Demonstration circuit 1668B-A is a PolyPhase
ply featuring two
buck µModule
regulators. The DC1668B-A input voltage
®
range is between 4.5V to 20V with a jumper programmable
output voltage from 0.6V to 3.3V. The demo circuit can
deliver up to 30A of load with excellent current-sharing.
Current derating may be necessary under certain operat-
ing conditions.
The LTM4627 can be synchronized to an external clock be-
tween 250kHz to 770kHz. The default switching frequency
for the DC1668B-A is set to 500kHz through the onboard
performance summary
PARAMETER
Maximum Input Voltage
Minimum Input Voltage
Output Voltage V
OUT
Maximum Continuous Output Current I
Default Operating Frequency
External Clock Synchronous Frequency Range
Output Voltage Ripple (Typical)
Efficiency
Load Transient
BoarD photo
Arrow.com.
Downloaded from
LTM
4627
high efficiency synchronous
®
CONDITIONS/NOTES
Remove V
Current Derating May Be Necessary for Certain V
OUT(MAX)
Frequency and Thermal Conditions
V
IN
V
IN
V
IN
Figure 1. LTM4627/DC1668B-A Demo Board
DEMO MANUAL DC1668B-A
High Efficiency PolyPhase
Step-Down Power Supply
power sup-
LTC6902 clock generator. The external clock interleaves
®
the paralleled phases to minimize input and output ripple.
DC1668B-A demonstrates that paralleling LTM4627 mod-
ules is easy and reliable. These features and the availability
of the LTM4627 in a compact thermally enhanced 15mm
× 15mm × 4.32mm LGA package make the circuit ideal for
use in high density point of load regulation applications.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, PolyPhase, µModule and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Specifications are at T
= 25°C
A
SEL Jumper for V
= 0.6V
OUT
OUT
= 12V, V
= 1.8V, 500kHz (20MHz BW)
OUT
= 12V, V
= 1.8V, 500kHz
OUT
= 12V, V
= 1.8V
OUT
LTM4627EV
0.6V
, 1V
, 1.2V
DC
DC
DC
, V
,
IN
OUT
< 30mV
86.6% at I
OUT
DC1668ba F01
VALUE
20V
4.5V
, 1.5V
1.8V
,
DC
DC
DC
2.5V
, 3.3V
DC
DC
30A
DC
500kHz
250kHz to 770kHz
at I
= 30A,
P-P
OUT
See Figure 6
= 30A, See Figure 3
See Figure 5
dc1668baf
1

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Summary of Contents for Linear Technology DC1688B-A

  • Page 1 250kHz to 770kHz. The default switching frequency L, LT, LTC, LTM, Linear Technology, PolyPhase, µModule and the Linear logo are registered for the DC1668B-A is set to 500kHz through the onboard trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
  • Page 2: Quick Start Procedure

    DEMO MANUAL DC1688B-A Quick start proceDure Demonstration circuit 1668B-A is an easy way to evaluate 4. Vary the input voltage from 5V to 20V and adjust the the performance of paralleled LTM4627 modules. Please load current from 0A to 30A. V...
  • Page 3 DEMO MANUAL DC1668B-A Quick start proceDure DC1668ba F02 Figure 2. Test Setup of DC1668B (All Versions) dc1668baf Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...
  • Page 4 DEMO MANUAL DC1688B-A Quick start proceDure 3.3V 2.5V 1.8V 1.5V 1.2V DC1668ba F04 LOAD CURRENT (A) DC1668ba F03 Figure 3. Measured Efficiency at 12V , 500kHz Figure 4. Thermal Capture at 12V , 1.8V , 30A, 500kHz No Forced Airflow (Convection). T = 29°C.
  • Page 5: Parts List

    KOA RK73B1JTTD101J RES, 0603 100k 5% 1/10W VISHAY CRCW0603100KJNEA RES, 0805 0Ω JUMPER VISHAY CRCW08050000Z0EA IC, LTC6902CMS LINEAR TECHNOLOGY LTC6902CMS C12, C52, C61 CAP, 0603 47pF 10% 50V NP0 AVX 06035A470KAT RES, 0603 15k 1% 1/10W VISHAY CRCW060315K0FKEA RES, 0603 20k 1% 1/10W VISHAY CRCW060320K0FKEA RES, 0603 9.53k 1% 1/10W...
  • Page 6 DEMO MANUAL DC1688B-A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER COUT24 CAP, 1812 OPTION TAIYO YUDEN JMK316BJ226ML-T CAP, 0603 1µF 20% 10V X5R OPTION TAIYO YUDEN LMK107BJ105MA-T OPTION C18, C55, C56, C57, C58, CAP, 0603 OPTION OPTION C62, C74 TO C77...
  • Page 7 DEMO MANUAL DC1668B-A schematic Diagram dc1668baf 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...
  • Page 8 DEMO MANUAL DC1688B-A schematic Diagram dc1668baf 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...
  • Page 9: 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 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.

This manual is also suitable for:

Ltm4627evLtc6902