Linear Technology DC2166A Quick setup guide

1
dc2166af
DEMO MANUAL DC2166A
Description
LTM4639
Low VIN 20A DC/DC
µModule Step-Down Regulator
Demonstration circuit 2166A features the LT M
®
4639EY,
a20A high efficiency, switch mode step-down power
µModule
®
regulator. The input voltage range is from
2.375V to 7V. The output voltage range is 0.6V to 5.5V.
Derating is necessary for certain VIN, VOUT, frequency and
thermalconditions. The DC2166AofferstheTRACK/SSpin
allowing the user to program output tracking or soft-start
period.Theboardoperatesincontinuousconductionmode
in heavy load conditions. For high efficiency at low load
currents, the MODE jumper (JP3) selects pulse-skipping
mode for noise sensitive applications or Burst Mode
®
operation in less noise sensitive applications. There is an L, LT, LTC, LTM, µModule, Burst Mode, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
BoarD photo
on board boost circuit using LT1935 to provide control
power to LTM4639 when VIN is less than 4.5V. LTM4639
has on board diode connected PNP transistors to monitor
its internal temperature. A temperature sensor LTC2997
converts the internal temperature to an analog voltage out-
put. The LTM4639 data sheet must be read in conjunction
with this demo manual prior to working on or modifying
demo circuit DC2166A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2166A
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dc2166af
DEMO MANUAL DC2166A
Quick start proceDure
Demonstration circuit DC2166A is an easy way to evalu-
ate the performance of the LTM4639EY. Please refer to
Figure 1 for proper measurement equipment setup and
follow the procedure below:
1. Place jumpers in the following positions for a typical
application:
RUN TRACK/SS MODE
VOUT
SELECT CPWR SELECT
ON SOFT-START CCM 1.0V BOOST
2. With power off, connect the input power supply, load
and meters as shown in Figure 1. Preset the load to 0A
and VIN supply to 3.3V.
3. Turn on the power supply at the input. The output volt-
age should be 1.0V ± 1.5% (0.985V to 1.015V).
4. Vary the input voltage from 2.375V to 7V and adjust
the load current from 0A to 20A. Observe the output
voltage regulation, ripple voltage, efficiency, and other
parameters.
performance summary
PARAMETER CONDITIONS/NOTES VALUE
Input Voltage Range 2.375V to 7V
Output Voltages 1.0V, 1.2V, 1.5V, 1.8V ± 1.5%
Maximum Continuous Output Current Derating is necessary for certain operating conditions.
See data sheet for details.
20ADC
Operating Frequency 500kHz
Efficiency VIN = 3.3V, IOUT = 20A 83.2% (VOUT1 = 1.0V) (Figure 2)
85.3% (VOUT1 = 1.2V) (Figure 2)
87.7% (VOUT1 = 1.5V) (Figure 2)
89.1% (VOUT1 = 1.8V) (Figure 2)
Load Transient VIN = 3.3V, VOUT = 1.0V, ISTEP = 0A to 10A 156mV (Figure 4)
5. (Optional) For optional load transient test, apply an
adjustable pulse signal between IOSTEP_CLK and GND
test points. The pulse amplitude sets the load step cur-
rent amplitude. Keep the pulse width short (<1ms) and
pulse duty cycle low (<5%) to limit the thermal stress
on the load transient circuit.
6. (Optional) LTM4639 can be synchronized to an external
clock signal. Place the JP3 jumper on EXTCLK and apply
a clock signal (0V to 5V, square wave) on the CLKIN
test point.
7. (Optional) The outputs of LTM4639 can track another
supplybysettingJP1to EXT. TRACK. If tracking external
voltage is selected, the corresponding test point TRACK
need to be connected to a valid voltage signal.
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dc2166af
DEMO MANUAL DC2166A
Quick start proceDure
–
+
–
+
–
+
LOAD
+
–
Figure 1. Measurement Setup of DC2166A
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dc2166af
DEMO MANUAL DC2166A
Quick start proceDure
60.0
65.0
70.0
75.0
80.0
90.0
85.0
95.0
100.0
0.0 5.0 10.0 15.0 20.0
EFFICIENCY (%)
LOAD CURRENT (A)
VOUT = 1.8V
VOUT = 1.5V
VOUT = 1.2V
VOUT = 1V
60.0
65.0
70.0
75.0
80.0
85.0
90.0
95.0
0.0 5.0 10.0 15.0 20.0
EFFICIENCY (%)
LOAD CURRENT (A)
VOUT = 1.8V
VOUT = 1.5V
VOUT = 1.2V
VOUT = 1V
Figure 2. Measured Efficiency at VIN = 3.3V, fSW = 500kHz, CCM
Figure 3. Measured Efficiency at VIN = 5.0V, fSW = 500kHz, CCM
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dc2166af
DEMO MANUAL DC2166A
Quick start proceDure
VOUT: 100mV/DIV
IOUT_STEP: 13.3A/DIV
Figure 4. Measured Load Transient
VIN = 3.3V, VOUT1 = 1.0V, ISTEP = 0A to 10A
Figure 5. Thermal Image of LTM4639
VIN = 3.3V, VOUT = 1.8V, ILOAD = 20A
Ambient Temperature = 23.3°C, No Forced Air Flow
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dc2166af
DEMO MANUAL DC2166A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C3, C5 CAP, 1210, 22µF, 10%, 16V, X5R MURATA GRM32ER61E226KE20L
2 1 C6 CAP, 150µF, 35V, ELEC SUN ELEC 35CE150AX
3 1 C9 CAP, 0603, 0.1µF, 10%, 50V, X7R TDK C1608X7R1H104K
4 1 C10 CAP, 0603, 180pF, 10%, 10V, X7R AVX, 0603ZC181KAT2A
5 2 C11, C13 CAP, 1210, 100µF, 20%, 6.3V, X5R TDK C3225X5R0J107M
6 1 C16 CAP, 7343, 470µF, 20%, 2.5V POSCAP PANASONIC 2R5TPE470M9
7 1 C18 CAP, 0603, 1.5nF, 5%, 25V, X7R AVX 06033C152JAT2A
8 1 R13 RES, 0603, 60.4kΩ, 1%, 1/10W VISHAY CRCW060360K4FKEA
9 1 R12 RES, 0603, 90.9kΩ, 1%, 1/10W VISHAY CRCW060390K9FKEA
10 1 R9 RES, 0603, 124kΩ, 1%, 1/10W VISHAY CRCW0603124K0FKEA
11 1 R14 RES, 0603, 40.2kΩ, 1%, 1/10W VISHAY CRCW060340K2FKEA
12 1 R15 RES, 0603, 30.1kΩ, 1%, 1/10W VISHAY CRCW060330K1FKEA
13 1 R20 RES. 0603, 100kΩ, 5%, 1/10W VISHAY CRCW0603100KJNEA
14 1 U1 IC, LTM4639EY LINEAR TECH LTM4639EY#PBF
Additional Demo Board Circuit Components
1 3 C1, C2, C8 CAP, 0603, 1µF, 20%, 10V, X5R TDK, C1608X5R1A105M
2 0 C4, C12, C22, C23 CAP, 1210 OPTION OPTION
3 0 C7 CAP, 0805 OPTION OPTION
4 0 C14 CAP, 7343 OPTION OPTION
5 0 C17, C19, C20, C21, C26 CAP, 0603 OPTION OPTION
6 1 C27 CAP, 0805, 4.7µF, 20%, 10V, X7R TDK C2012X7R1A475M
7 1 C28 CAP, 0805, 22µF, 10%, 16V, X5R TDK C2012X5R1C226K
81 C29 CAP, 0603, 470pF, 10%, 10V, X7R AVX, 0603ZC471KAT2A
9 1 D1 DIODE, SCHOTTKY 30V ON SEMI NSR0230P2T5G
10 1 L1 IND, 2.2µH, 2012 TAIYO YUDEN CBC2012T2R2M
11 1 Q1 XSTR, MOSFET, N-CHANNEL 30V VISHAY SUD50N04-8M8P-4GE3
12 2 R1, R23 RES, 0603, 10kΩ, 5%, 1/10W VISHAY CRCW060310K0JNEA
13 1 R2 RES, 2512, 0.015Ω, 1%, 1W VISHAY WSL2512R0150FEA
14 1 R3 RES, 0603, 60.4kΩ, 1%, 1/10W VISHAY CRCW060360K4FKEA
15 1 R4 RES, 0603, 90.9kΩ, 1%, 1/10W VISHAY CRCW060390K9FKEA
16 0 R5, R6, R8, R11, R22 RES, 0603 OPTION OPTION
17 4 R7, R16, R17, R21 RES, 0603, 0Ω JUMPER VISHAY CRCW06030000Z0ED
18 1 R10 RES. 0603, 20kΩ, 5%, 1/10W VISHAY CRCW060320K0JNEA
19 2 R18, R19 RES, 0603, 10Ω, 5%, 1/10W VISHAY CRCW060310R0JNEA
20 1 R24 RES, 0603, 29.4kΩ, 1% 1/10W VISHAY CRCW060329K4FKEA
21 1 U2 IC, LT1935AES5 LINEAR TECH. LT1935ES5#PBF
22 1 U3 IC, LTC2997IDCB LINEAR TECH., LTC2997IDCB#PBF
Hardware
1 12 E1-E12 TESTPOINT,TURRET,. 094" MILL-MAX 2501-2-00-80-00-00-07-0
2 2 JP1, JP2 HEADER, 1 ×3 , 2mm SULINS, NRPN031PAEN-RC
3 2 JP3, JP4 HEADER, 2 ×4, DOUBLE ROW, 2mm SULINS, NRPN042PAEN-RC
4 2 JP5 HEADER, 2 ×3, DOUBLE ROW, 2mm SULINS, NRPN032PAEN-RC
5 4 J1, J2, J5, J6 JACK, BANANA KEYSTONE 575-4
6 2 J3,J4 CONN., VERT. PC-MNT, BNC 50Ω CONNEX 112404
7 5 XJP1, XJP2, XJP3, XJP4, XJP5 SHUNT SAMTEC 2SN-BK-G
84 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE_8834
9 2 STENCILS TOP AND BOTTOM STENCIL DC2166A
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dc2166af
DEMO MANUAL DC2166A
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
A
A
B
B
C
C
D
D
E
E
4 4 3 3 2 2 1 1
2.375V - 7V
ON OFF
20A MAX CLK
RUN
1.8V 1.2V 1.0V 1.5V
2512
MODE
C4
C2
CCM PULSE SKIP BURST EXTCLK
OSCON
SOFTSTART EXT. TRACK
TRACK/SS
m
10V
30V 200MA
LT1935ES5
CPWR SELECT
4MV / K
1608
BOOST EXTERNAL VIN
VOUT SELECT
VO-
VO+ VO-
VO+
INTVCC
INTVCC
VIN
VOUT
VOUT
VIN
INTVCC
VOUT VIN
VIN
VIN
VIN
INTVCC
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
YAN L.
PRODUCTION
208/27/14
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
YAN L.
PRODUCTION
208/27/14
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
YAN L.
PRODUCTION
208/27/14
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
2
Thursday, August 28, 2014
11
LOW VIN, 20A STEP-DOWN
LT
YAN L.
N/A
LTM4639EY
DEMO CIRCUIT 2166A
MODULE REGULATOR
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
2
Thursday, August 28, 2014
11
LOW VIN, 20A STEP-DOWN
LT
YAN L.
N/A
LTM4639EY
DEMO CIRCUIT 2166A
MODULE REGULATOR
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
2
Thursday, August 28, 2014
11
LOW VIN, 20A STEP-DOWN
LT
YAN L.
N/A
LTM4639EY
DEMO CIRCUIT 2166A
MODULE REGULATOR
C19 OPT C19 OPT
C8 1uF 10V C8 1uF 10V
E5
TRACK
E5
TRACK
C17
OPT
C17
OPT R8
OPT
R8
OPT
+
470uF C16 2.5V 7343
+
470uF C16 2.5V 7343
U2U2
SHDN
4
SW 1
GND
2
FB 3
VIN 5
R20 100k R20 100k
C21 OPT C21 OPT
R24
29.4K
R24
29.4K
J6
GND
J6
GND
JP1JP1
1 3 2
E2
IOSTEP
E2
IOSTEP
R16
0
R16
0
E6
VO+
E6
VO+
C1 1uF 10V C1 1uF 10V
R9
124k
1%
R9
124k
1%
JP3JP3
1 3 56
4 2
78
C23 OPT 1210 C23 OPT 1210
R1 10K R1 10K
Q1
SUD50N04-8M8P
Q1
SUD50N04-8M8P
3
1
2
R19
10
R19
10
R6 OPT R6 OPT
U1
LTM4639EY
U1
LTM4639EY
SGND
G11
FSET
B12
VOUT_LCL
L12
COMPA
A11
VFB
F12
RUN A10
TRACK/SS A9
MODE_PLLIN A8
INTVCC
A7
VOSNS+
J12
VOSNS-
M12
DIFF_VOUT
K12
INTVCC
D9
VIN A1
VIN A2
VIN A3
VIN A4
VIN A5
VIN A6
VIN B1
VIN B2
VIN B3
VIN B4
VIN B5
VIN B6
VIN C1
VIN C2
VIN C3
VIN C4
VIN C5
VIN C6
VOUT J1
VOUT J2
VOUT J3
VOUT J4
VOUT J5
VOUT J6
VOUT J7
VOUT J8
VOUT J9
VOUT J10
VOUT K1
VOUT K2
VOUT K3
VOUT K4
VOUT K5
VOUT K6
VOUT K7
VOUT K8
VOUT K9
VOUT K10
VOUT K11
VOUT L1 VOUT L2 VOUT L3 VOUT L4 VOUT L5 VOUT L6 VOUT L7 VOUT L8 VOUT L9 VOUT L10 VOUT L11 VOUT M1 VOUT M2 VOUT M3 VOUT M4 VOUT M5 VOUT M6 VOUT M7 VOUT M8 VOUT M9 VOUT M10 VOUT M11
PGND
D1
PGND
D2
PGND
D3
PGND
D4
PGND
D5
PGND
D6
PGND
E1
PGND
E2
PGND
E3
PGND
E4
PGND
E5
PGND
E7
PGND
F1
PGND
F2
PGND
F3
PGND
F4
PGND
F5
PGND
F7
PGND
F8
PGND
F9
PGND
G1
PGND
G2
PGND
G3
PGND
G4
PGND
G5
PGND
G6
PGND
G7
PGND
G8
PGND
G9
PGND
H1
PGND
H2
PGND
H3
PGND
H4
PGND
H5
PGND H6 PGND H7 PGND H8 PGND H9
SGND
H11
SGND
H12
PGND
C9 PGND
C7
PGND
D8
PGND
E9
PGOOD
F11
PGOOD
G12
MTP7 D12 MTP6 D11 MTP5 D10 MTP4 C12 MTP3 C11 MTP2 C10 MTP1 B11
EXTVCC
E12
CPWR
B7
COMPB
A12
OT_TEST
B9
TEMP+
F6
TEMP-
E6
JP2JP2
1 3 2
C12 OPT 1210 C12 OPT 1210
R17
0
R17
0
R5 OPT R5 OPT
E3
GND
E3
GND
J2
GND
J2
GND
R11 OPT R11 OPT
R3
60.4K
1%
R3
60.4K
1%
R15 30.1K 1% R15 30.1K 1%
C13 100uF 6.3V 1210 C13 100uF 6.3V 1210
J5
VOUT
J5
VOUT
C11 100uF 6.3V 1210 C11 100uF 6.3V 1210
L1
2.2uH
L1
2.2uH
R23 10K R23 10K
U3
LTC2997IDCB
U3
LTC2997IDCB
D+ 1
D- 2
VCC 4
VPTAT
3
VREF
6
GND
5
GND
7
D1D1
12
C9
0.1uF
C9
0.1uF
C14 OPT 7343 C14 OPT 7343
R12 90.9K 1% R12 90.9K 1%
C18 1.5nF C18 1.5nF
E10
EXTVCC
E10
EXTVCC
J4 VOUT J4 VOUT
1
2
3
4
5
R7 0 R7 0
E9
SGND
E9
SGND
C22 OPT 1210 C22 OPT 1210
OPT 16V
1210
OPT 16V
1210
R4
90.9K
1% R4
90.9K
1%
J1
VIN
J1
VIN
R14 40.2K 1% R14 40.2K 1%
C3 22uF 16V
1210
C3 22uF 16V
1210
JP5JP5
1 3 56
4 2
R10 20k R10 20k
E8
CLKIN
E8
CLKIN
R22 OPT R22 OPT
E1
VIN
E1
VIN
JP4JP4
1 3 56
4 2
78
R2 0.015 1W R2 0.015 1W
C10 180pF C10 180pF
R21 0 R21 0
E11
PGOOD
E11
PGOOD
+
150uF C6 35V
+
150uF C6 35V
C29 470pF C29 470pF
R18
10
R18
10
E7
VO-
E7
VO-
C26 OPT C26 OPT
J3
IOSTEP
J3
IOSTEP
1
2
3
4
5
1uF 10V 1uF 10V
C5 22uF 16V 1210 C5 22uF 16V 1210
R13 60.4K 1% R13 60.4K 1%
C27 4.7uF 0805 C27 4.7uF 0805
E12
CPWR
E12
CPWR
C7 OPT 0805 C7 OPT 0805
C28 22uF 0805 C28 22uF 0805
C20 OPT C20 OPT
E4
VTEMP
E4
VTEMP
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dc2166af
DEMO MANUAL DC2166A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
LT 1114 • 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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