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dc2367af
DEMO MANUAL DC2367A
DESCRIPTION
LTM4632EV
Ultrathin µModule Regulator for DDR-QDR4
Memory VDDQ, VTT and VREF
Demonstration circuit DC2367A features the LT M
®
4632EV
µModule
®
regulator, a tiny low-profile high-performance
high efficiency dual step-down regulator for DDR power.
LTM4632 has an operating input voltage range of 3.6V
to 15V. The output voltage of channel 1 (VDDQ) is resis-
tor programmable from 0.6V to 2.5V and is capable of
delivering up to 3A of output current. The output voltage
of channel 2 (VTT) is set to regulate ½ of the voltage on
the VDDQIN pin which can provided by either the channel
1 output or an external reference voltage. It can source or
sink up to 3A of output current. A 10mA buffered output
of VDDQIN/2 is also provided for supplying VREF voltage
for DDR memory. DC2367A also provides the option for
paralleling channels 1 and 2 together for up to 6A capable
VTT rail. LTM4632 is a complete DC/DC DDR dual point L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
of load regulator in a low-profile thermally enhanced
6.25mm × 6.25mm × 1.82mm LGA package requiring
only a few input and output capacitors. Output voltage
tracking is available through the TRACK/SS pin for supply
rail sequencing. External clock synchronization is avail-
able through the SYNC/MODE pin. For high efficiency at
low load currents the MODE pin jumper (JP4) selects the
Burst Mode
®
option for operation in less noise sensitive
applications. The LTM4632 data sheet must be read in
conjunction with this demo manual for working on or
modifying demo circuit 2367A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2367A
BOARD PHOTO
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dc2367af
DEMO MANUAL DC2367A
QUICK START PROCEDURE
Demonstration circuit DC2367A is an easy way to evaluate
the performance of the LTM4632. Please refer to Figure 1
for test setup connections and follow the procedure below.
1. With power off, place the jumpers in the following
positions for a typical application for 2.5VOUT1 and
1.25VOUT2 rails:
JP1 JP2 JP3 JP4 JP6
RUN1 RUN2 TRACK/SS MODE VDDQ SEL
ON ON SS CCM 2.5V
2. Before powering up the input supply and loads, preset
the input voltage supply to be between 3.6V to 15V.
Preset the load current for each output rail to 0A.
3. With power off, connect the loads, input voltage supply
and meters as shown in Figure 1.
4. Turn on the input power supply. The output voltage me-
ters for each output rail should display the programmed
output voltage ±1.5%.
5. Once the proper output voltages are established, ad-
just the load current on each rail within the 0A to 3A
range and observe each output rail’s load regulation,
efficiency, and other parameters.
6. To observe increased light load efficiency place the
mode pin jumper (JP4) in the BURST MODE position.
PERFORMANCE SUMMARY
Specifications are at TA = 25°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 3.6 15 V
Output Voltage VOUT1 (VDDQ) Resistor Programmable, Jumper Selectable 1.5 (±1.5%)
1.8 (±1.5%)
2.5 (±1.5%)
V
V
V
Maximum Continuous Output Current IOUT1 Derating Is Necessary for Certain Operating
Conditions. See Data Sheet for Details
3 A
Output Voltage VOUT2 (VTT) VOUT1 = 1.5V
VOUT1 = 1.8V
VOUT1 = 2.5V
0.75
0.9
1.25
V
V
V
Maximum Continuous Output Current IOUT2 Derating Is Necessary for Certain Operating
Conditions. See Data Sheet for Details
±3 A
Default Operating Frequency 1 MHz
Efficiency VIN = 12V, VOUT1 = 2.5V, IOUT = 3A, fSW = 1MHz
VIN = 12V, VOUT2 = 1.25V, IOUT = 3A, fSW = 1MHz
83.9
(See Figure 2)
72.3
(See Figure 3)
%
%
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dc2367af
DEMO MANUAL DC2367A
VIN
VARIALE RESISTOR
(OPTIONAL) FOR
SINK CURRENT TEST
+
–
+
–
+
–
LOAD
0A TO 3A
+
–
+–
+
–
LOAD
0A TO 3A
+
–
+
–
+
–
+–
QUICK START PROCEDURE
Figure 1. Test Setup
Figure 2. VDDQ 12VIN Efficiency Figure 3. VTT 12VIN Efficiency
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
90
80
70
85
75
65
60 2.01.0
dc2367a F02
3.0
1.50.5 2.5
RUN2 = OFF
VDDQ = 2.5V
VDDQ = 1.8V
VDDQ = 1.5V
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
80
70
75
65
50
55
60
2.01.0
dc2367a F03
3.0
1.50.5 2.5
RUN1 = OFF
VDDQIN, SUPPLIED
EXTERNALLY
VTT = 1.25V
VTT = 0.9V
VTT = 0.75V
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dc2367af
DEMO MANUAL DC2367A
QUICK START PROCEDURE
V
IN = 12V
V
OUT1 = 2.5V
COUT1
= 100µF ×2, 10µF ×1
VOUT1 = 50mV/DIV
IOUT1_STEP = 2A/DIV
dc2367a F04
V
IN = 12V
V
OUT2 = 1.25V
COUT2
= 100µF ×3, 10µF ×1
VOUT2 = 50mV/DIV
IOUT1_STEP = 2A/DIV
dc2367a F05
Figure 4. VDDQ Load Transient Response (0A to 1.5A Load Step)
Figure 5. VTT Load Transient Response (0A to 1.5A Load Step)
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dc2367af
DEMO MANUAL DC2367A
QUICK START PROCEDURE
V
IN = 12V
V
OUT1 = 2.5V
I
OUT1 = 3A
V
OUT2 = 1.25V
I
OUT2 = 3A
f
SW = 1MHz
TA
= 25°C, NO FORCED AIRFLOW
dc2367a F06
Figure 6. 12VIN Full Load Thermal Capture
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dc2367af
DEMO MANUAL DC2367A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 CIN1, CIN2 CAP., 4.7µF, X5R, 16V, 10%, 0603 TDK - C1608X5R1C475K080AC
2 2 COUT7, COUT9 CAP., 10µF, X5R, 6.3V, 10%, 0805 MURATA, GRM219R60J106KE19D
3 5 COUT1, COUT2, COUT3, COUT4, COUT6 CAP., 100µF, X5R, 6.3V, 20%, 1206 MURATA, GRM31CR60J107ME39L
4 1 R4 RES., 19.1k, 1/10W, 1%, 0603 VISHAY, CRCW060319K1FKEA
5 1 U1 I.C., LTM4632EV, LGA 25-6.25X6.25 LINEAR TECH., LTM4632EV#PBF
Additional Demo Board Circuit Components
1 0 CIN4, COUT5, COUT8 CAP., OPTION, 1206 OPT
2 1 CIN5 CAP., 47µF, X5R, 16V, 20%, 1206 TDK, C3216X5R1C476M160AB
3 1 CIN3 CAP., 2.2µF, X7R, 25V, 10%, 0805 TAIYO YUDEN, TMK212B7225KGHT
4 1 CIN6 CAP., POSCAP, 22µF, X5R, 25V, 20%, 7343 PANASONIC, 25TQC22MV
5 4 CVCC1, C4, C18, CVCC CAP., 1µF, X5R, 10V, 10%, 0603 MURATA, GRM188R61A105KA61D
6 0 CDDQIN CAP., OPTION, 0805 OPT
7 1 CTR1 CAP., 4700pF, X7R, 50V, 10%, 0603 KEMET, C0603C472K5RACTU
8 1 CTTR CAP., 0.01µF, X7R, 50V, 10%, 0603 KEMET, C0603C103K5RACTU
9 1 CFFW1 CAP., 10pF, C0G, 50V, 5%, 0603 MURATA, GRM1885C1H100JA01D
10 0 CC1, CC2, CTTR1 CAP., OPTION, 0603 OPT
11 0 RFB1, RTR2, R7, R26, RD1, RDDQIN RES, OPTION, 0603 OPT
12 1 R5 RES., 30.1k, 1/10W, 1%, 0603 VISHAY, CRCW060330K1FKEA
13 1 R6 RES., 40.2k, 1/10W, 1%, 0603 VISHAY, CRCW060340K2FKEA
14 1 R3 RES., 10k, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA
15 2 RPG1, RPG2 RES., 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA
16 1 R8 RES., 1k, 1/10W, 1%, 0603 VISHAY, CRCW06031K00FKEA
17 2 R1, R2 RES., 1M, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA
18 2 RTR1, RVDDQ RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA
19 1 RS1 RES., 0.05Ω, 1/4W, 1%, 1206 VISHAY, WSL1206R0500FEA
20 0 R29 RES, OPTION, 2512 OPT
21 1 Q1 XSTR., MOSFET, N-CH, 40V, 14A, TO-252 VISHAY, SUD50N04-8M8P-4GE3
Hardware: For Demo Board Only
1 14 E1-E14 TESTPOINT, TURRET, 0.094" MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
2 3 JP1, JP2, JP3 CONN., HEADER, 1X3, 2mm SULLINS, NRPN031PAEN-RC
3 1 JP4 CONN., HEADER, 2X3, 2mm SULLINS, NRPN032PAEN-RC
4 1 JP6 CONN., HEADER, 2X4, 2mm SULLINS, NRPN042PAEN-RC
5 5 XJP1, XJP2, XJP3, XJP4, XJP6 SHUNT, 2mm SAMTEC 2SN-BK-G
6 2 J1, J2 CONN, BNC, 5PINS CONNEX, 112404
7 4 STAND OFF STAND OFF, NYLON, SNAP-ON, 0.375" KEYSTONE_8832
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dc2367af
DEMO MANUAL DC2367A
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.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
[1]
3.6V - 15V
10mA
3A
+/- 3A
(FORCED CONTINUOUS MODE)
2.5V 1.8V 1.5V USER SEL
VDDQ SEL
0603
15V DUAL 3A DDR µMODULE REGULATOR
IOSTEP
VDDQ
[1] CIN6, IS AN OPTIONAL CAPACITOR. IT IS INSERTED
TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE
DUE TO LONG INPUT LEADS. ON A NORMAL, TYPICAL
PCB, WITH SHORT TRACES, THE CAPACITOR IS
NOT NEEDED.
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS AND CAPACITORS ARE 0603
OPTIONAL JUMPERS FOR PARALLEL OPERATION
FOR POLY-PHASE OPERATION:
JP6 = OPEN
RD1, R29, R26, RDDQIN = 0
RVDDQ = OPT
VTT
VDDQ
VFB1
VDDQ VTT
COMP1 COMP2
VDDQ
COMP1
COMP2
VFB1
INTVCC
VIN
VIN
INTVCC INTVCC
INTVCC
VIN
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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 CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Thursday, September 03, 2015
11
LT
SY
N/A
LTM4632EV
DEMO CIRCUIT 2367A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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 CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Thursday, September 03, 2015
11
LT
SY
N/A
LTM4632EV
DEMO CIRCUIT 2367A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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 CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Thursday, September 03, 2015
11
LT
SY
N/A
LTM4632EV
DEMO CIRCUIT 2367A
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
SY
PRODUCTION
29/03/15
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
SY
PRODUCTION
29/03/15
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
SY
PRODUCTION
29/03/15
CFFW1
10pF
R1
1M
10uF
COUT7
6.3V
0805
RFB1
OPT
CIN5
47uF
16V
1206
E11
VDDQIN
CIN2
4.7uF
16V
0603
LTM4632EV
COMP2
A5
GND
D5
FB1 E4
VOUT2 B1
VOUT2 A1
COMP1
E5
PGOOD1 D4
VOUT1 D1
PGOOD2 B4
VIN E2
VIN B3
RUN1
D2 VDDQIN A4
VOUT1 E1
GND
C1
GND
C2
GND
C4
GND
B5
VIN D3
RUN2
B2
VIN A2
MODE/SYNC
C5
INTVCC
C3
VTTR
A3
TRACKSS1
E3
J2
1
2
3
4
5
E8
PGOOD2
RPG2
100K
E2
VIN1
R26
OPT
OPT
COUT8
6.3V
1206
CVCC
1uF
CC1
OPT
RPG1
100K
+
CIN6
22uF
25V
7343
J1
1
2
3
4
5
JP1
ON
OFF
RUN1
1
3
2
E1
PGOOD1
CVCC1
1uF
E12
CLK
E7
GND
JP3
TRACKSS
SS
TRACK
1
3
2
E4
VDDQ
OPT
CDDQIN
0805
E9
TRACK1
100uF
COUT3
6.3V
1206
CTR1
4700pF
CTTR1
OPT
Q1
SUD50N04-8M8P
1
2 3
R3
10K
C18
1uF
10V
E6
GND
JP2
ON
OFF
RUN2
1
3
2
OPT
COUT5
6.3V
1206
RS1
0.050
1%
1206
CIN3
2.2uF
25V
0805
R2
1M
100uF
COUT2
6.3V
1206
E10
IOSTEP CLK
CTTR
10nF
R29
OPT
2512
100uF
COUT6
6.3V
1206
CC2
OPT
JP4
MODE
FCM
BURST MODE
SYNC
1 2
3 4
5 6
RTR1
0
RTR2
OPT
RVDDQ
0
E13
VTTR
100uF
COUT1
6.3V
1206
E14
GND
C4
1uF
10V
R5
30.1k
1%
CIN1
4.7uF
16V
0603
R7
OPT
R4
19.1k
1%
RDDQIN
OPT
RD1
OPT
E3
GND
R6
40.2k
1%
100uF
COUT4
6.3V
1206
E5
VTT
JP6
1 2
3 4
5 6
7 8
CIN4
47uF OPT
16V
1206
10uF
COUT9
6.3V
0805
R8
1k
1%
8
dc2367af
DEMO MANUAL DC2367A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
LT 0116 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
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. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, 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, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
