Linear Technology DC2341A Quick setup guide

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dc2341af
DEMO MANUAL DC2341A
DESCRIPTION
LTC7130EY
20V 20A Monolithic Buck Converter
with Ultra-Low DCR Sensing
Demonstration circuit 2341A is a high efficiency syn-
chronous buck DC/DC converter with 4.5V to 20V input
range. It can supply 20A maximum load current at 1.5V
output. The demo board features the LT C
®
7130 regulator.
No external MOSFETs are required. It employs an LTC
proprietary current sensing, current mode architecture,
allowing the use of a very low DC resistance (DCR) power
inductor to maximize efficiency in high current applica-
tions. Differential output voltage sensing along with a
precision internal reference combine to offer accurate
output regulation. The LTC7130 is housed in a 6.25mm
× 7.5mm × 2.22mm 63-pin BGA package.
The light load operation mode of the converter is deter-
mined with the MODE/PLLIN pin. Use the JP2 jumper to
select pulse-skipping mode (P.S.), Burst Mode
®
(BURST) 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.
PERFORMANCE SUMMARY
or forced continuous mode (CCM) operation. Theconverter
can also be externally synchronized through the MODE/
PLLIN pin (MODE/PLLIN terminal on the board; JP2: no
jumper or BURST position). To shut down the converter,
one simple way is to force the RUN pin below 1.1V (JP1:
OFF). The power good output (PGOOD terminal) is low
when the output voltage is outside of the ±10% regula-
tion window.
The LTC7130 data sheet gives a complete description of
the operation and application information. The data sheet
must be read in conjunction with this demo manual.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2341A
Specifications are at TA= 25°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 4.5 20 V
Output Voltage VIN = 4.5V to 20V, IOUT = 0A to 20A 1.5 ±2% V
Maximum Output Current VIN = 4.5V to 20V, VOUT = 1.5V 20 A
Typical Switching Frequency 530 kHz
Typical Efficiency VIN = 12V, IOUT = 20A 89.2 %
Typical Output Voltage Ripple VIN = 12V, IOUT = 20A 25 mVP-P

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dc2341af
DEMO MANUAL DC2341A
QUICK START PROCEDURE
Demonstration circuit 2341A is easy to set up to evaluate
the performance of the LTC7130. Refer to Figure 1 for
the proper measurement equipment setup and follow the
procedure below:
1. With power off, connect the input power supply to VIN
(4.5V to 20V) and GND (input return).
2. Connect the 1.5V output load between VOUT and GND
(Initial load: no load).
3. Connect the DVMs to the input and outputs.
4. Turn on the input power supply and check for the proper
output voltages. VOUT should be 1.5V ±2%.
5. Once the proper output voltages are established, adjust
the loads within the operating range and observe the
output voltage regulation, ripple voltage and other
parameters.
NOTE: When measuring the output or input voltage ripple,
do not use the long ground lead on the oscilloscope probe.
See Figure 2 for the proper scope probe technique. Short,
stiff leads need to be soldered to the (+) and (–) terminals
of an output capacitor. The probe’s ground ring needs to
touch the (–) lead and the probe tip needs to touch the
(+) lead.
Figure 1. Proper Measurement Equipment Setup

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dc2341af
DEMO MANUAL DC2341A
Figure 2. Measuring Output Voltage Ripple
Figure 3. Efficiency vs Load Current (VO= 1.5V, Burst Mode)
Figure 4. Load Step Transient Test (VIN = 12V) Figure 5. Thermal Picture (VIN = 12V, IO= 20A. 21°C Ambient,
No Forced Airflow)
QUICK START PROCEDURE
+ –
V
OUT
GND
COUT
LOAD CURRENT (A)
0
EFFICIENCY (%)
100
95
90
75
55
85
65
70
80
60
50
dc2341a F03
20
105 15
4.5VIN
12VIN
20VIN
VO
50mV/DIV
AC-COUPLED
10A LOAD STEP
5A/DIV
TOTAL I
O: 10A TO/
FROM 20A
dc2341a F04

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dc2341af
DEMO MANUAL DC2341A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 CAP, ALUM ELEC180µF 20% 25V PANASONIC., 25SVPF180M
2 2 CIN4, CIN5 CAP, 1210 22µF 20% 25V X5R AVX, 12103D226MAT2A
3 1 CIN6 CAP, 1206 10µF 20% 25V X5R AVX, 12063D106MAT2A
4 2 COUT1, COUT4 CAP, 7343 330µF 20% 2.5V POSCAP PANASONIC, 2R5TPE330M9
5 4 COUT2, COUT3, C15, C16 CAP, 1210 100µF 20% 6.3V X5R AVX, 12106D107MAT2A
6 2 C1, C17 CAP, 0805 1µF 10% 25V X5R AVX, 08053D105KAT2A
7 2 C2, C5, C7 CAP, 0603 220nF 10% 25V X5R MURATA GRM188R71E224KA88D
8 1 C10 CAP, 0603 0.1µF 10% 10V X5R AVX, 0603ZD104KAT2A
9 1 C11 CAP, 2.2nF X7R 50V 5% 0603 AVX, 06035C222JAT2A
10 1 C12 CAP, 0603 120pF 10% 25V NPO AVX, 06033A121KAT2A
11 2 C6, C14 CAP, 0805 4.7µF 20% 10V X5R AVX, 0805ZD475MAT2A
12 1 D1 DOIDE, SCHOTTKY 30V SOD-323 CENTRAL SEMI., CMDSH-3 TR
13 1 L1 IND, 0.25µH WURTH ELEKTRONIK, 744308025
14 1 Q1 MOSFET, N-CH D-S 40V TO252 VISHAY, SUD50N04-8M8P-4GE3
15 1 R1 RES, 2.2Ω 1/10W 5% 0603 VISHAY, CRCW06032R20JNEA
16 4 R8, R16, R17, R20 RES, 0Ω JUMPER 1/10W 0603 VISHAY, CRCW06030000Z0EA
17 2 R19, R30 RES, 10k 1/10W 5% 0603 VISHAY, CRCW060310K0JNEA
18 1 R28 SENSE RES, 2512 0.01Ω 1% 1W VISHAY, WSL2512R0100FEA
19 1 R10 RES 0603 100k 1% 1/10W VISHAY, CRCW0603100KFKEA
20 1 R13 RES 0603 1k 1% 1/10W VISHAY, CRCW06031K00FKEA
21 1 R4 RES, 0603 619Ω 1% 1/10W VISHAY, CRCW0603619RFKEA
22 2 R9, R12 RES, 0603 10Ω 5% 1/10W VISHAY, CRCW060310R0JNEA
23 1 R24 RES, 0603 6.04k 1% 1/10W VISHAY, CRCW06036K04FKEA
24 2 R3 RES, 0603 2.7Ω 1% 1/10W VISHAY, CRCW06032R7FKEA
25 1 R23 RES, 0603 124k 1% 1/10W VISHAY, CRCW0603124KFKEA
26 1 R11 RES, 0603 3.01k 1% 1/10W VISHAY, CRCW06033K01FKEA
27 1 R5 RES, 0603 3.09k 1% 1/10W VISHAY, CRCW06033K09FKEA
28 1 R32 RES, 0603 6.65k 1% 1/10W VISHAY, CRCW06036K65FKEA
29 1 U1 IC, LTC7130EY#PBF LINEAR TECH., LTC7130EY#PBF
Additional Demo Board Circuit Components
30 0 COUT5, COUT6 OPT CAP, 7343 OPTION
31 0 CIN2, CIN3, (OPT) CAP, OPTION
32 0 C3, C4, C8, C9, C13, (OPT) CAP, 0603 OPTION
33 0 RN1, R2, R6, R7, R14, R15, R18, R22,
R25, R27, R29
RES, 0603 OPTION
Hardware: For Demo Board Only
34 13 E1-E13 TESTPOINT, TURRET, 0.094" PbF MILL-MAX, 2501-2-00-80-00-00-07-0
35 1 JP2 HEADER, 4 PIN 0.079" SINGLE ROW SULLINS, NRPN041PAEN-RC
36 1 JP1 HEADER, 3 PIN 0.079" SINGLE ROW SULLINS, NRPN031PAEN-RC
37 4 J1-J4 JACK, BANANA KEYSTONE 575-4
38 1 J5 CONN, BNC, 5 PINS CONNEX, 112404
39 4 MH1, MH2, MH3, MH4 STAND-OFF, NYLON 0.50" tall KEYSTONE, 8833
40 2 JP1, JP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

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DEMO MANUAL DC2341A
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
744308025 DCR=0.37mOHM
12101210
N/A
VOUT
LOAD STEP CIRCUIT
IOUT
IOSTEP CLK
2512 2512
1210 1210
1206
1210 1210
TEMPERATURE COMPENSATION
NETWORK FOR DCR SENSING
STEP
20A MAX
SW
PGOOD
CLKOUT ITEMP
EXTVCC
CLKOUT
ITEMP
PGOOD EXTVCC
VOUT
INTVCC
VOUT
INTVCC
VIN
VOUT
VOUT
VIN
SIZE DATE:
IC NO.
REV
SHEET OF
TITLE:
CONTRACT NO.
APPROVALS
PCB DES.
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.
2
Wednesday, December 02, 2015 1 1
HIGH EFFICIENCY STEP-DOWN CONVERTER
HZ
Charlie
LTC7130EY DC2341A
WITH INTEGRATED FETS AND VERY LOW DCR INDUCTOR
SIZE DATE:
IC NO.
REV
SHEET OF
TITLE:
CONTRACT NO.
APPROVALS
PCB DES.
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.
2
Wednesday, December 02, 2015 1 1
HIGH EFFICIENCY STEP-DOWN CONVERTER
HZ
Charlie
LTC7130EY DC2341A
WITH INTEGRATED FETS AND VERY LOW DCR INDUCTOR
SIZE DATE:
IC NO.
REV
SHEET OF
TITLE:
CONTRACT NO.
APPROVALS
PCB DES.
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.
2
Wednesday, December 02, 2015 1 1
HIGH EFFICIENCY STEP-DOWN CONVERTER
HZ
Charlie
LTC7130EY DC2341A
WITH INTEGRATED FETS AND VERY LOW DCR INDUCTOR
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
9-2-15PRODUCTION
2Charlie
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
9-2-15PRODUCTION
2Charlie
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
9-2-15PRODUCTION
2Charlie
__
E13
C9 OPT
+
COUT1 330uF 2.5V 7343
J2
GND
R7 OPT
E11
R32
6.65k
1%
E6
MODE/PLLIN
J5
1
2
3
4
5
R20 0
C1 1uF 25V
C17 1uF
+
COUT4 330uF 2.5V 7343
U1
LTC7130
ITH
A5
VFB A6
DIFFOUT A4
DIFFN A2
DIFFP A3
SNSD+ B1
SNS- B2
SNSA+ C1
ILIM
C2
SW J2
SW H3
SW G2
SW J3
INTVCC
D1
SW G1
PGOOD
C7
MODE/PLLIN
C6
FREQ
B7
RUN
B6
TK/SS
B5
VIN G7
SW G3
SW H1
SW H2
SW J1
GND D2
GND D3
GND D4
GND E1
GND E2
GND E3
GND F2
GND F3
GND
G4
GND
G5
GND
G6
GND
H4
GND
H5
GND
H6
GND
H7
GND
J4
GND
J5
GND
J6
GND
J7
VIN E4
VIN E5
VIN E6
VIN E7
VIN F4
VIN F5
VIN F6
VIN F7
SGND
B3
SGND
B4
SGND
C4
SGND
C5
BOOST F1
ITEMP
D6
SVIN
D5
EXTVCC
D7
CLKOUT
C3
NC1 A1
NC2 A7
C8 OPT
R6 OPT
COUT2
100uF
6.3V
R10 100k
R27 OPT
E9
PGOOD
C5 220nF
R13 1k 1%
C6 4.7uF 6.3V
R22 OPT
C15 100uF
6.3V
C11 2.2nF
+
CIN2
OPT 25V
R14 OPT
R19 10k 1%
C16
100uF
6.3V
R8 0
E3
RUN
+
COUT6
OPT 7343
C4 OPT
R24 6.04k 1%
J4
GND
JP2 MODE/PLLIN
P.S. CCM
BURST
1
2 3
4
E7
TRK/SS
R2 OPT
R18 OPT
D1
CMDSH-3
R25
OPT
R3 2.7
R4 619 1%
R11 3.01k 1%
R28 0.010
R1 2.2
C14 4.7uF 6.3V
CIN6 10uF 25V
J3
1.5V
VOUT
E4
VO_SNS+
Q1
SUD50N03-10CP-E3
1
2 3
E10
EXTVCC
E1
VIN
CIN4 22uF 25V
R30 10K
C7 220nF R15 OPT
C2
0.22uF 25V
C12
120pF
R17 0
R23
124k
E5
VO_SNS-
E12
GND
L1 0.25uH
C10 0.1uF 10V
+
COUT5
OPT 7343
E8
CLKOUT C13
OPT
R5 3.09k 1%
R9 10
CIN5 22uF 25V
JP1
RUN
OFFON
1
2
3
R16 0
E2
GND
CIN3 OPT 25V
+
CIN1
180uF
25V
J1
4.5V - 20V
VIN
R12
10
C3 OPT
R29 OPT
RN1
OPT
1 2
COUT3 100uF
6.3V

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dc2341af
DEMO MANUAL DC2341A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
LT 0316 • 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
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observe good laboratory practice standards. Common sense is encouraged.
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engineer.
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