Linear Technology DC1900A Quick setup guide

1
dc1900af
DEMO MANUAL DC1900A
Description
LTM4644EY
Quad 4A Output Step-Down
µModule Regulator
Demonstration circuit 1900A features the LT M
®
4644EY
µModule
®
regulator, a high-performance high-efficiency
quad output step-down regulator. The LTM4644EY has an
operating input voltage range of 4V to 14V and is able to
provide up to 4A of output current from each of its phases.
Each output’s voltage is programmable from 0.6V to 5.5V.
The LTM4644EY is a DC/DC point of load regulator in a
9mm × 15mm × 5.01mm BGA package requiring only a
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
performance summary
BoarD photo
few input and output capacitors. Output voltage tracking
is available through the TRACK/SS pin for supply rail se-
quencing. External clock synchronization is also available
through the CLKIN pin. The LTM4644 data sheet must be
readinconjunctionwiththisdemomanualpriortoworking
on or modifying demo circuit 1900A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1900A
Specifications are at TA= 25°C
PARAMETER CONDITIONS VALUE
Input Voltage Range 4V to 14V
Output Voltage VOUT Jumper Selectable VOUT1 = 3.3VDC, VOUT2 = 2.5VDC,
VOUT3 = 1.5VDC, VOUT4 = 1.2VDC
Maximum Continuous Load Current per Output De-rating is necessary for certain operating conditions.
See data sheet for details
4ADC
Default Operating Frequency 1MHz
Efficiency VIN = 12V, VOUT1 = 3.3V, IOUT = 4A 89% See Figure 2
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dc1900af
DEMO MANUAL DC1900A
Quick start proceDure
Demonstration circuit 1900Ais an easy way to evaluate the
performance of the LTM4644EY. 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:
JP1 JP2 JP3 JP4
RUN1 RUN2 RUN3 RUN4
ON ON ON ON
JP8 JP7 JP6 JP5
MODE1 MODE2 MODE3 MODE4
CCM CCM CCM CCM
2. Before connecting input supply, loads and meters,
preset the input voltage supply to be between 4.5V to
14V. Preset the load currents to 0A.
3. With power off, connect the loads, input voltage supply
and meters as shown in Figure 1.
4. Turn on input power supply. The output voltage meters
for each phase should display the programmed output
voltage within ± 2%.
5. Once the proper output voltage is established, adjust
the load currents for each phase within the 0A to 4A
range and observe the load regulation, efficiency, and
other parameters.
6. To observe increased light load efficiency place a Mode
pin jumper (JP5-JP8) in the DCM Mode position.
Note: Optional jumper positions are available on the
DC1900A to allow for easy setup to evaluate parallel
operation of the LTM4644. For example, to parallel all
4 outputs of the LTM4644 together stuff 0Ω jumpers
for R32-R46.
Figure 1. Test Setup of DC1900A
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dc1900af
DEMO MANUAL DC1900A
Quick start proceDure
Figure 2. Measured Supply Efficiency at 5VIN and 12VIN
LOAD CURRENT (A)
75
EFFICIENCY (%)
83
95
77
79
81
87
89
85
93
91
123
DC1900A F01a
40
3.3VOUT1
2.5VOUT2
1.5VOUT3
1.2VOUT4
5VIN
LOAD CURRENT (A)
75
EFFICIENCY (%)
83
95
77
79
81
87
89
85
93
91
123
DC1900A F01b
40
3.3VOUT1
2.5VOUT2
1.5VOUT3
1.2VOUT4
12VIN
Figure 3. Measured VOUT1 = 3.3V and VOUT4 = 1.2V Load Transient Responses (2A to 4A Load Step)
Figure 4. Measured Thermal Capture with All Phases at Full Load (4A)
20µs/DIV DC1900A F03a
VOUT1
200mV/DIV
VIN = 12V
VOUT = 3.3V
2× 47µF/6.3V/CERAMIC
LOAD STEP SLEW RATE = 1A/µs
IOUT1
2A/DIV
20µs/DIV DC1900A F03b
VOUT4
200mV/DIV
IOUT4
2A/DIV
VIN = 12V
VOUT = 1.2V
2× 47µF/6.3V/CERAMIC
LOAD STEP SLEW RATE = 1A/µs
DC1900A F04
VIN = 12V
VOUT1 = 3.3V, VOUT2 = 2.5V, VOUT3 = 1.5V, VOUT4 = 1.2V
NATURAL CONVECTION
AMBIENT TEMPERATURE = 31.2°C
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dc1900af
DEMO MANUAL DC1900A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C1, C3 CAP, 1206, CER. 22µF 25V X5R 20% MURATA, GRM31CR61E226KE15L
2 1 C6 CAP, 0603, X5R, 1uF, 16V 10% AVX, 0603YD105KAT2A
3 4 C9, C17, C28, C36 CAP, 1210 CER. 47µF 6.3V AVX, 12106D476MAT2A
4 4 C10, C16, C29, C35 CAP, 1206, X5R, 47uF, 6.3V, 20% TAIYO YUDEN, JMK316BJ476ML
5 1 R3 RES, 0603, 13.3kΩ 1% 1/10W VISHAY CRCW060313K3FKEA
6 1 R4 RES, 0603, 40.2kΩ 1% 1/10W VISHAY CRCW060340K2FKEA
7 2 R11 RES, 0603, 19.1kΩ 1% 1/10W VISHAY CRCW060319K1FKEA
8 1 R12 RES, 0603, 60.4kΩ 1% 1/10W VISHAY CRCW060360K4FKEA
9 1 U1 LTM4644EY, BGA-15X9-5.01 LINEAR TECH.CORP. LTM4644EY
Additional Demo Board Circuit Components
1 2 C4, C5 CAP, 1206, CER. 22µF 25V X5R 20% MURATA, GRM31CR61E226KE15L
2 1 C2 CAP, 7343, POSCAP 68µF 16V SANYO, 16TQC68MYF
3 6 C7, C21, C22, C31, C41, C42 CAP, 0603, OPTION OPTION
4 4 C8, C18, C27, C37 CAP, 7343, POSCAP, OPTION OPTION
5 8 C11, C12, C14, C15, C30, C38, C33, C34 CAP, 1206, CER., OPTION OPTION
6 2 C13, C32 CAP, 0603, CER., 100PF AVX 06033C101KAT2A
7 4 R7, R8, R15, R16 RES, 0603, 0Ω 1% 1/10W VISHAY, CRCW06030000Z0ED
8 1 R28 RES, 0805, 0Ω 5% 1/16W VISHAY, CRCW08050000Z0EA
9 4 R19, R20, R21, R22 RES, 0603, 150kΩ 5% 1/10W VISHAY CRCW0603150KJNEA
10 4 R23, R24, R25, R26 RES, 0603, 100kΩ 5% 1/10W VISHAY CRCW0603100KJNEA
11 4 R9, R10, R17, R18 RES, 0603, OPTION OPTION
12 12 R32-R35, R37-R40, R42-R45 (OPT) RES, 0603, OPTION OPTION
13 3 R36, R41, R46 (OPT) RES, 2512, 0Ω, OPTION OPTION
14 4 C25, C26, C45, C46 CAP, 0603, CER. 10µF 50V X7R TDK, C1608X7R1H104M
15 1 R1 RES., 0603, CHIP, 10k, 1% VISHAY, CRCW060310K0FKED
16 1 R2 RES, 0603, 1Ω 5% 1/10W VISHAY,CRCW06031R00JNEA
17 4 R27, R29, R30, R31 RES, 0603, 100kΩ 5% 1/10W VISHAY CRCW0603100KJNEA
Hardware
1 16 E1, E3-E17 TESTPOINT, TURRET 0.094" MILLMAX 2501-2-00-80-00-00-07-0
2 2 J1, J2 JACK, BANANA KEYSTONE 575-4
3 8 JP1-JP8 JMP, 0.079 SINGLE ROW HEADER, 3 PIN SULLINS, NRPN031PAEN-RC
4 8 XJP1-XJP8 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G
5 4 STAND-OFFS STAND-OFF, SNAP ON, NYLON 0.375" TALL KEYSTONE, 8832(SNAP ON)
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dc1900af
DEMO MANUAL DC1900A
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
4V - 14V
GND VOUT3 GND
CLKIN
TRACK2
VIN
1.5V / 4A MAX
1.2V / 4A MAX
VOUT4 GND
3.3V / 4A MAX VOUT1 GND 2.5V / 4A MAX VOUT2 GND
TEMP
ON OFF
ON OFF
ON OFF
ON OFF
TRACK1 TRACK3
TRACK4
OPTIONAL JUMPERS FOR
PARALLEL OPERATION
CCM DCM
7343
7343 7343
RUN1 RUN2 RUN3 RUN4
7343
7343


1210
1210
1210
1210
VIN+ GND
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE 0603.
MODE4
CCM DCM
MODE3
CCM DCM
MODE2
CCM DCM
MODE1
VIN
VOUT3
INTVCC3 INTVCC4
VOUT4
INTVCC1
SS1
FB1
VOUT1
COMP1 INTVCC2
SS2
COMP2
SS3 SS4
FB1 FB3 FB4
FB2
FB2 FB3 COMP2 COMP3
COMP1 COMP3 COMP4
COMP2
SS2 SS3 SS1 SS3 SS4
SS2
RUN2 RUN3 RUN1 RUN3 RUN4
RUN2
COMP4 COMP3
VOUT2 VOUT3 VOUT1 VOUT3 VOUT4
VOUT2
FB2 FB4
FB3
VOUT2
INTVCC1 INTVCC2 INTVCC3 INTVCC4
VIN
RUN1 RUN2 RUN3 RUN4
RUN1 RUN2 RUN3 RUN4 INTVCC4 INTVCC3 INTVCC1INTVCC2
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone] Milpitas, CA 95035 Phone: [phone] 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
3
LTM4644EY
Tuesday, April 23, 2013 1 1
QUAD 4A STEP-DOWN MODULE REGULATOR
LT
SAM Y.
N/A
DEMO CIRCUIT 1900A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone] Milpitas, CA 95035 Phone: [phone] 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
3
LTM4644EY
Tuesday, April 23, 2013 1 1
QUAD 4A STEP-DOWN MODULE REGULATOR
LT
SAM Y.
N/A
DEMO CIRCUIT 1900A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone] Milpitas, CA 95035 Phone: [phone] 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
3
LTM4644EY
Tuesday, April 23, 2013 1 1
QUAD 4A STEP-DOWN MODULE REGULATOR
LT
SAM Y.
N/A
DEMO CIRCUIT 1900A
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
SAM Y.
PRODUCTION
304-23-13
_
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
SAM Y.
PRODUCTION
304-23-13
_
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
SAM Y.
PRODUCTION
304-23-13
_
JP3JP3
1
2
3
R25 100K 1% R25 100K 1%
R20 150K R20 150K
+
C8
OPT
+
C8
OPT
JP7JP7
1
2
3
JP1JP1
1
2
3
R8
0
R8
0
R1
10K
R1
10K
E4E4
R38
OPT
R38
OPT
R18 OPT R18 OPT
C22
OPT
C22
OPT
R39
OPT
R39
OPT
C4
22uF
25V
1206
C4
22uF
25V
1206
C25
0.1uF
C25
0.1uF
TP2
PGOOD2
TP2
PGOOD2
C30 OPT
1206
C30 OPT
1206
R45
OPT
R45
OPT
R12
60.4K
R12
60.4K
R35
OPT
R35
OPT
E7E7
C32 100pF C32 100pF
C5
22uF
25V
1206
C5
22uF
25V
1206
R28
0
0805 R28
0
0805
R46
OPT2512
R46
OPT2512
+
C37 OPT
+
C37 OPT
C21
OPT
C21
OPT
TP1
PGOOD1
TP1
PGOOD1
R10 OPT R10 OPT
JP5JP5
1
2
3
C41 OPT C41 OPT
JP2JP2
1
2
3
JP8JP8
1
2
3
+
C18
OPT
+
C18
OPT
C3
22uF
25V
1206
C3
22uF
25V
1206
C13 100pF C13 100pF
E11E11
J2J2
C38 OPT
1206
C38 OPT
1206
TP3
PGOOD3
TP3
PGOOD3
E10E10
C14 OPT 1206 C14 OPT 1206
C46
0.1uF
C46
0.1uF
JP4JP4
1
2
3
C26
0.1uF
C26
0.1uF
C9
47uF
6.3V
C9
47uF
6.3V
R26 100K 1% R26 100K 1%
R44
OPT
R44
OPT
R21 150K R21 150K
R19 150K R19 150K
E9E9
C28
47uF
6.3V
C28
47uF
6.3V
C42
OPT
C42
OPT
R17
OPT
R17
OPT
R27
100K
R27
100K
E8E8
R24 100K 1% R24 100K 1%
E3E3
C11
OPT
1206
C11
OPT
1206
R34
OPT
R34
OPT
R30
100K
R30
100K
R7
0
R7
0
C45
0.1uF
C45
0.1uF
C12
OPT 1206
C12
OPT 1206
R33
OPT
R33
OPT
E15E15
R36
OPT2512
R36
OPT2512
R11
19.1K
R11
19.1K
R41
OPT2512
R41
OPT2512
TP4
PGOOD4
TP4
PGOOD4
R23 100K 1% R23 100K 1%
E1E1
R29
100K
R29
100K
E17E17
R40
OPT
R40
OPT
JP6JP6
1
2
3
C29
47uF
6.3V
1206
C29
47uF
6.3V
1206
C16 47uF 6.3V 1206 C16 47uF 6.3V 1206
E14E14
C10
47uF
6.3V 1206
C10
47uF
6.3V 1206
TP5
CLKOUT
TP5
CLKOUT
C36 47uF 6.3V C36 47uF 6.3V
E16E16
R9 OPT R9 OPT
LTM4644EY
U1
LTM4644EY
U1
GND
B2
VOUT1
A1 VOUT3 F1
VOUT4 J1
VOUT2
C1
GND
D3
GND
A4
PGOOD2
C2
PGOOD3
F2
PGOOD4
J2
PGOOD1
C3
TEMP F3
CLKOUT J3
INTVCC1
C4
INTVCC2
F4
INTVCC3 J4 INTVCC4 K5
TRACK/SS1
A6
MODE1 B6
RUN1
C6
TRACK/SS2
D6
MODE2 E6
RUN2
F6
TRACK/SS4 K6
MODE4 L6
RUN4
K7
FB4 J7
TRACK/SS3 G6
MODE3 H6
RUN3
J6
FB1
A7
COMP1
B7
CLKIN C7
FB2
D7
COMP2
E7
SGND
F7
FB3 G7
COMP3 H7 COMP4 L7
VIN1 B3
VIN2 E3
VIN3 H3
VIN4 L3
SVIN1 B5
SVIN2 E5
SVIN3 H5
SVIN4 L5
GND
A5
GND
B1
VOUT1
A2
VOUT1
A3
VIN3 H4
VIN4 L4
VIN2 E4
VIN1 B4
VOUT3 G1 VOUT3 G2 VOUT4 K2 VOUT4 K1
GND
L1
GND
H1
GND
E1
GND
E2 GND
H2 GND
L2
GND
G3 GND
K3
GND
D4 GND
G4 GND
K4
GND
C5
GND
D5
GND
F5
GND
G5
GND
J5
VOUT2
D2 VOUT2 D1
E6E6
R31
100K
R31
100K
E13E13
R4
40.2K
R4
40.2K
C6
1uF
C6
1uF
C15 OPT 1206 C15 OPT 1206 C34 OPT 1206 C34 OPT 1206
C31 OPT C31 OPT
C17 47uF 6.3V C17 47uF 6.3V
C1
22uF
25V
1206
C1
22uF
25V
1206
E5E5
+
C2
68uF
16V
+
C2
68uF
16V
R43
OPT
R43
OPT
E12E12
J1J1
R37
OPT
R37
OPT
R16
0
R16
0
C33 OPT 1206 C33 OPT 1206
R32
OPT
R32
OPT
R3
13.3K
R3
13.3K
R15
0
R15
0
R22 150K R22 150K
C35 47uF 6.3V 1206 C35 47uF 6.3V 1206
R42
OPT
R42
OPT
+
C27 OPT
+
C27 OPT
C7
OPT
C7
OPT
R2 1 R2 1
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dc1900af
DEMO MANUAL DC1900A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013
LT 0913 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C 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 LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
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