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dc2455abf

DEMO MANUAL DC2455A-B

Description

LTM4650EY-1 

High Efficiency, PolyPhase 150A Step-Down 

Power µModule

®

 Regulator

3× LTM4650EY-1, 150A

Demonstration Circuit 2455A-B features PolyPhase

®

 design 

using the 

LTM

®

4650EY-1

 (B-grade), the high efficiency, 

high density, dual 25A, switch mode step-down power 

module regulator. The input voltage is from 4.5V to 15V. 

The output voltage is jumper selectable from 0.9V to 1.8V. 

DC2455A-B can deliver nominal 150A output current. As 

explained in the data sheet, output current de-rating is 

necessary for certain V

IN

, V

OUT

, and thermal conditions. The 

LTM4650-1 on DC2455A-B always operate in continuous 

conduction mode. The switching frequency can be pro-

grammed through a resistor or can be synchronized to an 

external clock signal. The board allows the user to program 

how its output voltage ramps up and down through the 

L

, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, PolyPhase and TimerBlox are 

registered trademarks of Linear Technology Corporation. All other trademarks are the property 

of their respective owners.

TRACK pin. The output voltage is tightly regulated between 

“V

O

+

” and “V

O

” through remote output voltage sensing 

which improves output voltage regulation at heavy loads. 

These features and the availability of the LTM4650EY-1 

in a compact 16mm × 16mm × 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 DC2455A-B.

Design files for this circuit board are available at  

http://www.linear.com/demo/DC2455A-B

Figure 1. 3× LTM4650-1, 150A PolyPhase LTM4650-1/DC2455A-B Demo Board

Summary of Contents for DC2455A-B

Page 1: ...ternalclocksignal Theboardallowstheusertoprogram how its output voltage ramps up and down through the L LT LTC LTM Linear Technology the Linear logo Module PolyPhase and TimerBlox are registered trade...

Page 2: ...lse signal between IOSTEP CLK and GND test point Pulse amplitude 3V 3 5V sets the loadstepcurrentamplitude Theoutputtransientcurrent can be monitored at the BNC connector J12 5mV A The pulse signal sh...

Page 3: ...tart Procedure 1m VOUT0 LOAD 0A 150A VIN 4 5V TO 16V Figure 2 Test Setup of DC2455A B Figure 3 Measured Efficiency VIN 12V fSW 500kHz LOAD CURRENT A 0 EFFICIENCY 100 95 65 90 85 80 60 75 70 40 20 60 D...

Page 4: ...DIV AC COUPLED 75A TO 112 5A LOAD X AXIS DC2455AB F05 VOUT 20MHz BW 5mV DIV Figure 4 Load Transient 75A to 112 5A VIN 12V VOUT1 1V fSW 500kHz Figure 5 Output Voltage Ripple VIN 12V VOUT1 1V IOUT 150A...

Page 5: ...107ME20L 16 1 C46 CAP 1210 10 F 16V X5R MURATA GRM32DR61C106KA01L 17 1 C47 CAP 0603 220pF 10 50V X7R AVX 06035C221KAT2A 18 1 C49 CAP 0603 47nF 10 50V X7R AVX 06035C473KAZ2A 19 1 L1 IND 68 H CDRH105 SU...

Page 6: ...ON 6 13 R6 R19 R20 R27 R28 R32 R33 R35 R40 R45 R62 R63 R91 RES 0603 0 JUMPER VISHAY CRCW06030000Z0EA 7 2 R13 R34 RES 0603 0 JUMPER VISHAY CRCW06030000Z0EA 8 4 R22 R23 R24 R26 RES 2010 0 JUMPER VISHAY...

Page 7: ...CATIONS HOWEVER IT REMAINS THE CUSTOMER S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFF...

Page 8: ...GY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER SUPPLIED SPECIFICATIONS HOWEVER IT REMAINS THE CUSTOMER S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICA...

Page 9: ...McCarthy Blvd LTC CONFIDENTIAL FOR CUSTOMER USE ONLY CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER SUPPLIED SPECIFICATIONS HOWEVER IT REMAINS THE CU...

Page 10: ...ENTIAL FOR CUSTOMER USE ONLY CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER SUPPLIED SPECIFICATIONS HOWEVER IT REMAINS THE CUSTOMER S RESPONSIBILITY T...

Page 11: ...ACTUAL APPLICATION COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANC...

Page 12: ...TORY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE EXCEPT TO THE EXTENT OF THIS INDEMNITY NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECIAL INCIDENT...

Page 13: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Analog Devices Inc DC2455A B...

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