Linear Technology LTM4620A Demo Manual

Page 1
Description
DEMO MANUAL DC2268A-B
LTM4620A
Dual 13A or Single 26A
μModule Regulator
Demonstration circuit 2268A-B is a high efficiency, high density, dual 13A, switch mode step-down power supply on a compact 1.5' × 1.2' PCB. It features the LTM4620A μModule regulator. The input voltage is from 5.5V to 16V. The output voltage is programmable from 0.6V to 5V. DC2268A-B can deliver up to 13A maximum in each channel. As explained in the data sheet, output current
, V
derating is necessary for certain V conditions. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the resistor jumper (R1/R2) selects pulse­skipping mode for noise sensitive applications or Burst
®
Mode be connected in parallel for a single 26A output solution with optional jumper resistors. The board allows the user to program how its output ramps up and down through
in less noise sensitive applications. Tw o outputs can
IN
, and thermal
OUT
BoarD photo
the TRACK/SS pin. Remote output voltage sensing is available for improved output voltage regulation at the load point. An optional input inductor L1 reduces the EMI noise for noise sensitive applications. DC2268A can be easily inserted to an edge connector for testing and debugging. These features and the availability of the LTM4620A in a compact 16mm × 16mm × 5.01mm BGA package make it ideal for use in many high-density point-of-load regula
.
tion applications in conjunction with this demo manual for working on or modifying the demo circuit DC2268A-B.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2268A-B
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
The LTM4620A data sheet must be read
-
Figure 1. LTM4620A/DC2268A-B Demo Board
dc2268abfa
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DEMO MANUAL DC2268A-B
performance summary
PARAMETER CONDITIONS VALUE
Input Voltage Range 5.5V ~ 16V
Output Voltage V
Output Voltage V
Per-Channel Maximum Continuous Output Current Derating Is Necessary for Certain V
Default Operating Frequency 750kHz
Resistor Programmable Frequency Range 250kHz to 780kHz
External Clock Sync. Frequency Range 400kHz to 780kHz
Efficiency of Channel 1 V
Efficiency of Channel 2 V
Load Transient of Channel 1 V
Load Transient of Channel 2 V
VIN = 4.5V ~ 15V, I
OUT1
VIN = 4.5V ~ 15V, I
OUT2
Specifications are at TA = 25°C
= 0A ~ 13A 3.3V ±1.5%
OUT1
= 0A ~ 13A 1.5V ±1.5%
OUT2
Conditions.
= 12V, V
IN
= 12V, V
IN
= 12V, V
IN
= 12V, V
IN
OUT2
OUT1
OUT2
OUT1
= 3.3V, I
= 5V, I
OUT1
= 3.3V, I
= 5V, I
STEP
OUT2
STEP
, V
and Thermal
IN
OUT
= 13A, fSW = 750kHz 91.8% See Figure 3
= 13A, fSW = 750kHz 93.9% See Figure 4
= 6.5A ~ 13A See Figure 5
= 6.5A ~ 13A See Figure 6
13A
Quick start proceDure
Demonstration circuit DC2268A-B is easy to set up to evaluate the performance of the LTM4620A. It can be easily inserted to an edge connector (SAMTEC MEC2­20-01-L-DV--TR) for testing and debugging. Please refer to Figure 2 for proper measurement setup and follow the procedure below:
1. Pull up the RUN1 (J1 pin 22) and RUN2 (J1 pin 24) between 1.4V to 5V or leave them floating.
4. Once the proper output voltage is established, adjust the load within the operating range and observe the output voltage regulation, output voltage ripple, efficiency and other parameters. Output ripple should be measured at Co3 and Co4.
5. (Optional) LTM4620A can be synchronized to an exter nal clock signal. Remove R2 and apply a clock signal (0~5V, square wave) to MODE-PLLIN pin.
-
2. With power off, connect the input power supply, load and meters as shown in Figure 1. Preset the load to 0A and V
supply to 12V.
IN
3. Turn on the power supply at the input. The output volt-
channel 1 should be 3.3V ± 1.5% (3.2505V ~
age in
3.3495V)
and the output voltage in channel 2 should
be 5V ± 1.5% (4.925V ~ 5.075V),
2
6. (Optional) LTM4620A can be configured for a 2-phase single
output at up to 36A on DC2268A-B. Install 0Ω resistors on R26, R27, R28, R29, R32, and remove R14, R18, R30. Output voltage is set by R7 based on equation V
= 0.6V(1 + 60.4k/R7).
OUT
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DEMO MANUAL DC2268A-B
Quick start proceDure
Table 2. DC2268A Demo Circuit
DEMO BOARD NUMBER µMODULE REGULATOR ON THE BOARD OUTPUT CURRENT
DC2268A-A LTM4620 13A,13A
DC2268A-B LTM4620A 13A,13A
DC2268A-C LTM4628 8A, 8A
DC2268A-D LTM4630 18A,18A
DC2268A-E LTM4630-1 18A,18A
DC2268A-F LTM4630A 18A, 18A
DC2268A-G LTM4631 10A, 10A
Figure 2. Test Setup of DC2268A-B
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DEMO MANUAL DC2268A-B
dc2268ab F05
EFFICICENCY (%)
100
dc2268ab F03
13
100
13
EFFICICENCY (%)
dc2268ab F04
Quick start proceDure
Efficiency, 3.3V Efficiency, 5V
VIN = 12V
= 750kHz
f
SW
95
90.4
84.6
87.5
89.1
91.1
90
85
91.6
91.8
92 92
92
91.9
91.8
949394
95
90
87
85
90.2
91.4
92.4
93.5
93.9
93.7
94
93.9
80
75.2
75
0
62 1073 1151 9
I
(A)
LOAD
84 12
Figure 3. Measured Efficiency on Channel 1 (V
= 3.3V, fSW = 750kHz, Channel 2 Disabled)
OUT1
3.3V OUTPUT (20MHz BW) [20mV/DIV]
80
77.4
75
0
62 1073 1151 9
I
LOAD
VIN = 12V f
SW
84 12
(A)
= 750kHz
Figure 4. Measured Efficiency on Channel 2 (V
= 5V, fSW = 750kHz, Channel 1 Disabled)
OUT2
4
Figure 5. Measured Channel 6.5A to 13A Load Transient (VIN = 12V, V
6.5A TO 13A LOAD STEP
OUT1
= 3.3V)
dc2268abfa
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dc2268ab F06
Quick start proceDure
5V OUTPUT (20MHz BW) [20mV/DIV]
DEMO MANUAL DC2268A-B
6.5A TO 13A LOAD STEP
Figure 6. Measured Channel 2 6.5A to 13A Load Transient (VIN = 12V, V
Figure 7. Thermal Performance at VIN = 12V, V V
= 5V/8A, fSW = 750kHz, TA = 23°C, 200LFM Airflow
OUT2
= 3.3V/8A,
OUT1
OUT2
= 5V)
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DEMO MANUAL DC2268A-B
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 6 CIN1, CIN2, CIN3, CIN4, CIN5, CIN6 CAP, 1210 22µF 10% 25V X5R AVX 12103D226K AT2A
2 2 CO1, CO5 CAP, 7343 330µF 20% 6.3V POSCAP PANASONIC 6TPF330M9L
3 4 CO2, CO3, CO4, CO6 CAP, 1210 100µF 10% 6.3V X5R AVX 12106D107K AT2A
4 1 C6 CAP, 0603 4.7µF 20% 6.3V X5R AVX 06036D475M AT2A
5 1 C7 CAP, 0603 47pF 5% 50V C0G / NP0 AVX 06035A470J AT2A
6 2 C8, C14 CAP, 0603 0.1µF 10% 25V X7R AVX 06033C104K AT2A
7 1 C15 CAP, 0603 33pF 5% 50V C0G AVX 06035A330J AT2A
8 2 C16, C17 CAP, 0603 10µF 20% 25V X5R TDK C1608X5R1E106M080AC
9 2 C18, C20 CAP, 0603 22µF 20% 6.3V X5R TDK C1608X5R0J226M080AC
10 1 L1 IND, 1.0µH COILCCRAFT XAL5030-102MEC
11 2 R2, R22 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA
12 3 R3, R5, R14 RES, 0603 100Ω 5% 0.1W VISHAY CRCW0603100RJNEA
13 1 R4 RES, 0603 121k 1% 0.1W VISHAY CRCW0603121KFKEA
14 2 R6, R17 RES, 0603 10k 5% 0.1W VISHAY CRCW060310K0JNEA
15 1 R7 RES, 0603 13.3k 1% 0.1W VISHAY CRCW060313K3FKEA
16 1 R9 RES, 0603 0Ω VISHAY CRCW06030000Z0EA
17 1 R15 RES, 0603 191k 1% 0.1W VISHAY CRCW0603191KFKEA
18 1 R18 RES, 0603 8.25k 1% 0.1W VISHAY CRCW06038K25FKEA
19 3 R24, R25, R30 RES, 0603 10Ω 5% 0.1W VISHAY CRCW060310R0JNEA
20 1 U1 IC, VOLTAGE REGULATOR LGA LINEAR TECH
Additional Demo Board Circuit Components
1
0 C1, C2, C3, C4, C5, C9, C10, C11, C12,
C13
2 0 R1, R8, R10, R11, R12, R13, R16, R19,
R20, R21, R23, R26, R27, R28, R29
3 0 R31, R32 RES, 2512 OPTION OPTION
Hardware: For Demo Board Only
1 1 J1 CONN., CARD EDGE 1.6mm SAMTEC MEC2-20-01-L-DV--TR
CAP, 0603 OPTION OPTION
RES, 0603 OPTION OPTION
. LTM4620AEV#PBF
6
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DEMO MANUAL DC2268A-B
5
4
3
2
1
schematic Diagram
1
1
1
2
2
2
1
1
1
www.linear.com
www.linear.com
30
29
OPT
VOUT1
VOUT1
R29
VOUT1
32
34
VOUT1
VOUT2
VOUT1
VOUT2
31
33
VOUT1
36
35
COMP2
OPT
COMP1
38
40
VOUT2
VOUT2
VOUT2
VOUT2
37
39
VOUT2 VOUT2
www.linear.com
Milpitas, CA 95035
Phone: (408)432-1900
Milpitas, CA 95035
Phone: (408)432-1900
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
Fax: (408)434-0507
Fax: (408)434-0507
1630 McCarthy Blvd.
1630 McCarthy Blvd.
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
TECHNOLOGY
TECHNOLOGY
TECHNOLOGY
SCHEMATIC
SCHEMATIC
SCHEMATIC
TITLE:
TITLE:
TITLE:
` \
` \
` \
Yingyi Y.
Yingyi Y.
Yingyi Y.
APPROVALS
APPROVALS
APPROVALS
PCB DES.
PCB DES.
PCB DES.
APP ENG.
APP ENG.
APP ENG.
CUSTOMER NOTICE
CUSTOMER NOTICE
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
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
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
VOUT2
VOUT2
A A
5V AT 13A
CO5
330uF
6.3V
+
VOUT2
VOS2+_R
R30 10
VFB1
VOUT1
C18
22uF
COMP1
C3
OPT
R7
1%
13.3K
RUN1
VOS2+
C5
OPT
OPT
R10
C4
OPT
R12
OPT
R13
VIN2
OPT
TRACK1
INTVCC
R6
P2
VOS1-
D5
G2
SW1
VFB1
VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1
CLKOUT
MODE-PLLIN
TEMP
VINL2VINL3VINL4VINL5VINL6VINL7VINL8VINL9VIN
10K
PGOOD1
G9
E6
COMP1
PGOOD1
VOS1+
R8
F5
E5
C5
RUN1
TRACK1
VOUTS1
VINM2VINM3VINM4VINM5VINM6VINM7VINM8VINM9VIN
VIN
L10
L11
OPT
R9
INTVCC
VFB1
VFB1
R11
0
F8
3.3V AT 13A
CO3
100uF
6.3V
1210
1210
P1
7343
121K
VOS1-_R
R24 10
100
R5
C2
OPT
C4 C3 C2 C1 B5 B4 B3 B2 B1 A5 A4 A3 A2 A1
G5
F4
J6
1%
VIN
J2
VIN
J3
VIN
J4
VIN
J9
VIN
J10
VIN
J11
VIN
K2
VIN
K3
VIN
K4
VIN
K9
VIN
K10
VIN
K11
VOUT1
CO2
100uF
6.3V
VOS1+_R
R25 10
CO1
330uF
6.3V
+
100
R3
C1
OPT
VOS1+
INTVCC
R1
OPT
0
R2
R4
25V
C17
10uF
25V
C16
10uF
22uF
25V
CIN6
1210
22uF
25V
CIN5
CIN4
CIN3
22uF
22uF
1210
25V
1210
25V
1210
VIN2
R31 OPT
L1 1uH
22uF
25V
CIN2
1210
22uF
25V
CIN1
1210
VIN1
D D
C8
C7
47pF
OPT
A10
A11
A12
B10
VOUT2A8VOUT2A9VOUT2
VOUT2
VOUT2
VOUT2B8VOUT2B9VOUT2
DIFFOUT
U1
LTM4620AEV
VIN
INTVCCH8EXTVCC
J7
M10
M11
EXTVCC
C6
6.3V
4.7uF
C C
0.1uF
B11
R14
C10
B12
VOUT2
C9
100
OPT
C10
C11
C12
VOUT2
VOUT2C9VOUT2
VOUT2
FSETC6PHASMD
R15
191K 1%
OPT
C11 OPT
VOUT2
G4
CO6
100uF
CO4
100uF
VFB2
D7
VFB2
INTVCC
C12
INTVCC VIN2
6.3V
1210
6.3V
1210
R18
R16
R17
P3
G11
SW2
R21
OPT
8.25K 1%
R20
OPT
OPT
OPT
C13
OPT
10K
PGOOD2
COMP2
RUN2
G8
E7
F9
D8
C8
RUN2
COMP2
VOUTS2
PGOOD2
GNDA6GNDA7GNDB6GNDB7GNDD1GNDD2GNDD3GNDD4GNDD9GND
R22
R19
OPT
VOS2+
TRACK2
D10
0
VOUT2
C20
22uF
VFB2
VOS1+
TRACK2
VOS1-
R32
OPT
VOUT1 VOUT2
R23
C15
33pF
OPT
C14
0.1uF
E8
E9
DIFFP
DIFFN
SGND
G7
SGND
G6
SGND
F7
SGND
F6
SGND
D6
SGND
C7
GND
M12
GND
M1
GND
L12
GND
L1
GND
K12
GND
K8
GND
K7
GND
K6
GND
K5
GND
K1
GND
J12
GND
J8
GND
J5
GND
J1
GND
H12
GND
H11
GND
H10
GND
H9
GND
H7
GND
H6
GND
H5
GND
H4
GND
H3
GND
H2
GND
H1
GND
G12
GND
G10
GND
G3
GND
G1
GND
F12
GND
F11
GND
F10
GND
F3
GND
F2
GND
F1
GND
E12
GND
E11
GND
E10
GND
E4
GND
E3
GND
E2
GND
GND
GND
E1
D11
D12
R26
R27
OPT
OPT
RUN1 RUN2
OPTIONAL JUMPER FOR
TRACK1 TRACK2
1 OUTPUT CONFIGURATION
RUN2
RUN1
2
4
6
8
10
12
14
16
18
20
22
24
VIN
VIN
GND
J1
VIN
VIN
GND
1
3
5
7
26
N/A
GND
GND
GND
GND
GND
GND
RUN1
RUN2
GND
GND
GND
GND
N/A
GND
VOS1+
VOS1-
VOS2+
9
11
13
15
17
19
21
23
25
R28
28
VOUT1
VOUT1
27
VFB1 VFB2
VOUT1
VOUT1
VIN1 VIN1
VOS1-_R
VOS1+_R
VOS2+_R
B B
SHEET OF
SHEET OF
SHEET OF
1
LTM4620AEV
LTM4620AEV
LTM4620AEV
DEMO CIRCUIT 2268A-B
DEMO CIRCUIT 2268A-B
DEMO CIRCUIT 2268A-B
Friday, May 01, 2015
Friday, May 01, 2015
Friday, May 01, 2015
HIGH EFFICIENCY, STEP-DOWN, MODULE
REGULATOR
HIGH EFFICIENCY, STEP-DOWN, MODULE
REGULATOR
HIGH EFFICIENCY, STEP-DOWN, MODULE
REGULATOR
IC NO. REV.
IC NO. REV.
IC NO. REV.
N/A
N/A
N/A
SIZE
DATE:
SIZE
DATE:
SIZE
DATE:
SCALE = NONE
SCALE = NONE
SCALE = NONE
2
C:\PROJECTS\LTM4620A\DC2268A-B\DEMO MANUAL\2268AB-2.DSN
C:\PROJECTS\LTM4620A\DC2268A-B\DEMO MANUAL\2268AB-2.DSN
C:\PROJECTS\LTM4620A\DC2268A-B\DEMO MANUAL\2268AB-2.DSN
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
3
4
5
dc2268abfa
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.
7
Page 8
DEMO MANUAL DC2268A-B
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 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. 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.
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 LTC applica­tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
Linear Technology Corporation
8
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
dc2268abfa
LT 0615 REV A • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2015
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