DC2367A - Demo Manual

DEMO MANUAL DC2367A
LTM4632EV
Ultrathin µModule Regulator for DDR-QDR4
Memory VDDQ, VTT and VREF
DESCRIPTION
Demonstration circuit DC2367A features the LTM®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 resistor 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
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 available 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
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.
BOARD PHOTO
dc2367af
1
DEMO MANUAL DC2367A
PERFORMANCE SUMMARY
PARAMETER
Specifications are at TA = 25°C
CONDITIONS
MIN
Input Voltage Range
TYP
3.6
MAX
15
UNITS
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
1
MHz
Default Operating Frequency
VIN = 12V, VOUT1 = 2.5V, IOUT = 3A, fSW = 1MHz
Efficiency
VIN = 12V, VOUT2 = 1.25V, IOUT = 3A, fSW = 1MHz
83.9
(See Figure 2)
72.3
(See Figure 3)
%
%
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 meters for each output rail should display the programmed
output voltage ±1.5%.
5. Once the proper output voltages are established, adjust 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.
dc2367af
2
DEMO MANUAL DC2367A
QUICK START PROCEDURE
VIN
+
–
+
–
VARIALE RESISTOR
(OPTIONAL) FOR
SINK CURRENT TEST
+
+
LOAD
0A TO 3A
–
+
+
LOAD
0A TO 3A
–
–
+
–
–
–
+
+ –
+
–
Figure 1. Test Setup
80
RUN2 = OFF
85
75
80
70
EFFICIENCY (%)
EFFICIENCY (%)
90
75
70
VDDQ = 2.5V
VDDQ = 1.8V
VDDQ = 1.5V
65
60
0
0.5
1.0
2.0
1.5
OUTPUT CURRENT (A)
2.5
3.0
dc2367a F02
Figure 2. VDDQ 12VIN Efficiency
65
RUN1 = OFF
VDDQIN, SUPPLIED
EXTERNALLY
VTT = 1.25V
VTT = 0.9V
VTT = 0.75V
60
55
50
0
0.5
1.5
1.0
2.0
OUTPUT CURRENT (A)
2.5
3.0
dc2367a F03
Figure 3. VTT 12VIN Efficiency
dc2367af
3
DEMO MANUAL DC2367A
QUICK START PROCEDURE
VOUT1 = 50mV/DIV
IOUT1_STEP = 2A/DIV
VIN = 12V
VOUT1 = 2.5V
COUT1 = 100µF ×2, 10µF ×1
dc2367a F04
Figure 4. VDDQ Load Transient Response (0A to 1.5A Load Step)
VOUT2 = 50mV/DIV
IOUT1_STEP = 2A/DIV
VIN = 12V
VOUT2 = 1.25V
COUT2 = 100µF ×3, 10µF ×1
dc2367a F05
Figure 5. VTT Load Transient Response (0A to 1.5A Load Step)
dc2367af
4
DEMO MANUAL DC2367A
QUICK START PROCEDURE
VIN = 12V
VOUT1 = 2.5V
IOUT1 = 3A
VOUT2 = 1.25V
IOUT2 = 3A
fSW = 1MHz
TA = 25°C, NO FORCED AIRFLOW
dc2367a F06
Figure 6. 12VIN Full Load Thermal Capture
dc2367af
5
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
OPT
Additional Demo Board Circuit Components
1
0
CIN4, COUT5, COUT8
CAP., OPTION, 1206
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
dc2367af
6
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
A
B
C
D
E10
E9
E6
E12
E1
E3
J1
RTR2
OPT
Q1
1
R3
10K
FCM
SYNC
BURST MODE
JP2
3
2
1
5
3
1
JP4
MODE
1
RS1
0.050
1%
1206
SS
TRACK
3
C4
1uF
10V
VDDQ
JP3
2
1
TRACKSS
1. ALL RESISTORS AND CAPACITORS ARE 0603
5
1M
R2
CIN5
47uF
16V
1206
CIN3
2.2uF
25V
0805
6
4
2
C18
1uF
10V
1
J2
R1
1M
COMP2
COMP1
CC1
OPT
E5
E3
C5
C3
B2
D2
INTVCC
CC2
OPT
COMP1
TRACKSS1
MODE/SYNC
INTVCC
RUN2
RUN1
RPG1
100K
4
VIN
A2
[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.
VDDQ
3
2
CVCC
1uF
RUN1
JP1
VIN
1
CIN1
4.7uF
16V
0603
4
CIN2
4.7uF
16V
0603
CVCC1
1uF
OFF
ON
CTR1
4700pF
INTVCC
(FORCED CONTINUOUS MODE)
OFF
ON
VIN
CIN4
47uF OPT
16V
1206
RUN2
SUD50N04-8M8P
0
RTR1
R8
1k
1%
+ CIN6
22uF
25V
7343
[1]
NOTE: UNLESS OTHERWISE SPECIFIED
IOSTEP
IOSTEP CLK
TRACK1
GND
CLK
PGOOD1
GND
3.6V - 15V
E2
5
4
3
2
3
2
D3
E2
B3
LTM4632EV
B1
A1
E4
E1
D1
A4
VFB1
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
2
SCALE = NONE
APPROVALS
OPT
CFFW1
10pF
ECO
2
REV
R5
30.1k
1%
1.8V
USER SEL
R7
OPT
COUT4
100uF
6.3V
1206
1.5V
R6
40.2k
1%
COUT2
100uF
6.3V
1206
VDDQ SEL
COUT1
100uF
6.3V
1206
OPT
RDDQIN
COUT6
100uF
6.3V
1206
COUT3
100uF
6.3V
1206
COUT8
OPT
6.3V
1206
OPT
R26
OPT
2512
R29
DATE:
N/A
SIZE
TECHNOLOGY
COMP2
VTT
E13
10mA
VTTR
VTT
+/- 3A
GND
GND
VDDQ
3A
VDDQIN
LTM4632EV
1
SHEET 1
DEMO CIRCUIT 2367A
Thursday, September 03, 2015
IC NO.
2
OF 1
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
CTTR1
OPT
0603
E5
E7
E14
E4
E11
PGOOD2
SY
APPROVED
15V DUAL 3A DDR µMODULE REGULATOR
TITLE: SCHEMATIC
COMP1
VDDQ
VDDQ
COUT7
10uF
6.3V
0805
COUT9
10uF
6.3V
0805
VTT
COUT5
OPT
6.3V
1206
CDDQIN
OPT
0805
E8
DATE
9/03/15
1
PRODUCTION
REVISION HISTORY
DESCRIPTION
OPTIONAL JUMPERS FOR PARALLEL OPERATION
2.5V
R4
19.1k
1%
JP6
INTVCC
RFB1
OPT
RD1
2
RVDDQ
0
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. LT
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG. SY
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
FOR POLY-PHASE OPERATION:
JP6 = OPEN
VFB1
RD1, R29, R26, RDDQIN = 0
RVDDQ = OPT
CTTR
10nF
VOUT2
VOUT2
FB1
VOUT1
VOUT1
VDDQIN
RPG2
100K
INTVCC
3
B4
PGOOD2
VIN1
2
3
4
5
D4
PGOOD1
COMP2
A5
VIN
GND
C1
2
1
VIN
GND
C2
4
3
VIN
GND
B5
GND
C4
6
5
VIN
GND
D5
VTTR
A3
8
7
5
A
B
C
D
DEMO MANUAL DC2367A
SCHEMATIC DIAGRAM
dc2367af
7
DEMO MANUAL DC2367A
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
dc2367af
8
Linear Technology Corporation
LT 0116 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
Similar pages