Linear Technology DC2397A Quick setup guide

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dc2397af
DEMO MANUAL DC2397A
DESCRIPTION
LTC3130EUD-1
25V, 600mA Buck-Boost DC/DC Converter
with 1.6μA Quiescent Current
Demonstration circuit 2397A features the LT C
®
3130-1, a
wide input voltage, wide output voltage operating range,
high efficiency, low noise monolithic DC/DC buck-boost
converter.
The LTC3130-1 has 4-pin selectable output voltages
and operates from input voltages of 2.4V to 25V. The
LTC3130-1 incorporates a proprietary low noise switching
algorithm which optimizes efficiency with input voltages
above, below, or equal to the output voltage and ensures
seamless transitions between operating modes.
The LTC3130-1’s user selectable output voltages are 1.8V,
3.3V, 5.0V and 12V. To set the desired output voltage on
the DC2397A, use the “VOUT JUMPER CONFIGURATION”
table on the front of the board to determine the jumper
settings for JP2 and JP3.
The DC2397A demo board has two user selectable oper-
ating modes:Burst Mode
®
operation and fixed frequency
PWM (JP1). In PWM Mode, the LTC3130-1 operates at
1.2MHz to allow high efficiency while minimizing the
solution footprint.
Internal compensation reduces footprint size by reducing
the number of external components. This also simplifies
the design process and reduces external component cost.
An accurate RUN threshold can be set to enable the
converter at a desired input voltage. The DC2397A demo
board is set up to use R2 in conjunction with R3 to set
this threshold. See the data sheet for details. 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
Maximum power point control (MPPC) allows for simple
optimization of power transfer between the converter
and a non-ideal supply such as a photovoltaic panel or
anotherhighimpedancesource.TheDC2397A demo board
can be set to operate in MPPC mode by setting jumper
JP4 to “ON”, removing R4 and populating R5 and R6. In
most applications this function can be realized, often with
better efficiency, by using the accurate RUN comparator
functionality. See the data sheet for details.
A PGOOD open-drain output is provided and is pulled
up to VOUT. This output asserts low when VOUT is below
regulation.
The LTC3130-1 allows the internal VCC rail to be fed
externally from the EXTVCC pin. In some applications the
efficiency of the converter can be improved by allowing
VCC to be back-fed from a supply, such as VOUT. Setting
the EXTVCC jumper (JP6) on the demo board to “EXT”
back-feeds VCC through EXTVCC from VOUT. Setting this
jumper to internal (“INT”) powers VCC off the VIN input.
See the data sheet for additional details.
The LTC3130/LTC3130-1 data sheet has detailed informa-
tion about the operation, specifications, andapplicationsof
the device. The data sheet should be read in conjunction
with this quick start guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2397A
Input Voltage Range 2.4V to 25V
VOUT 1.8V, 3.3V, 5V, 12V
IOUT (see Note 1) 600mA
Efficiency See Figure 1
Note 1: The demo board output current is a function of VIN. Please refer to the data sheet for more information.

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dc2397af
DEMO MANUAL DC2397A
QUICK START PROCEDURE
Figure2. DC2397A Step Load Response. VIN = 12V,
VOUT = 12V, Load Step is from 100mA to 400mA.
Figure 1: DC2397A Typical Efficiency vs Load. VOUT = 12V.
V
IN
= 5V, PWM MODE
V
IN
= 5V, Burst Mode OPERATION
V
IN
= 24V, Burst Mode OPERATION
V
IN
= 24V, PWM MODE
LOAD CURRENT (A)
1.0E-04
1.0E-03
1.0E-02
1.0E-01
1.0E+00
0
10
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
DC2397A F01
IOUT: 200mA/DIV
VOUT: 500mV/DIV
200μs/DIV
Using short twisted pair leads for any power connections
and with all loads and power supplies off, refer to Figure4
for the proper measurement and equipment setup. The
power supply (PS1) should not be connected to the circuit
until told to do so in the procedure below.
When measuring the input or output voltage ripple, care
must be taken to avoid a long ground lead on the oscil-
loscope probe. Measure the input or output voltage ripple
by touching the probe tip directly across the VIN or VOUT
and GND terminals (see Figure 5), or by using an oscil-
loscope probe tip jack.
1. Jumper and PS1 settings to start:
PS1: OFF
JP1: MODE FIXED FREQ
JP2: VS1 VCC
JP3: VS2 VCC
JP4: MPPC OFF
JP5: RUN ON
JP6: EXTVCC INT
2. With power OFF connect the power supply (PS1) as
shown in Figure 4. If accurate current measurements
are desired (for efficiency calculation for example)
then connect ammeters in series with supplies as
shown. The ammeters are not required however.
3. Connect a 50mA load (240Ω) to VOUT as shown in
Figure 4.
4. Turn on PS1 and slowly increase the voltage until
the voltage at VIN is 3V.
5. Verify VOUT is ~12V.
6. VIN can now be varied between 2.4V and 25V. The
load may need to be reduced for VIN < 3V for VOUT
to remain in regulation.
7. The load can be varied. The maximum load is a
function of VIN and the device current limit. Consult
the data sheet for more information on output cur-
rentvsVIN.
8. VOUT can be varied by setting jumpers JP2 and JP3
in accordance with the “VOUT JUMPER CONFIGU-
RATION” table on the front of the DC2397A demo
board.
9. For operation in Burst Mode, move jumper JP1 to
“Burst Mode” position. See the data sheet for more
information on Burst Mode operation.
10. For operation with VCC powered from VOUT, move
JP6 to “EXT”.
NOTE: If VOUT drops out of regulation, check to be
sure the maximum load has not been exceeded, and
that VIN is not below the minimum value for regula-
tion (see data sheet).

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dc2397af
DEMO MANUAL DC2397A
Figure3. DC2397A Thermal Performance. VIN = 12V, VOUT = 12V, Load = 600mA.
QUICK START PROCEDURE
Figure 4. Proper Measurement Equipment Setup
Figure 5. Measuring Input or Output Ripple
GNDVIN

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dc2397af
DEMO MANUAL DC2397A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C1, C5, C6 CAP CER 1µF 50V 10% X7R 0805 MURATA, GRM21BR71H105KA12L
2 1 C2 CAP CER 10µF 50V X7R 1210 MURATA, GRM32ER71H106KA12L
3 2 C7, C8 CAP CER 22µF 25V X7R 1210 MURATA, GRM32ER71E226KE15L
4 2 C9, C10 CAP CER 0.1µF 50V X7R 0603 MURATA, GRM188R71H104KA93D
5 1 C11 CAP CER 4.7µF 6.3V 10% X5R 0603 MURATA, GRM188R60J475KE19D
6 1 C12 CAP CER 4.7µF 50V 10% X5R 0805 MURATA, GRM21BR61H475KE51L
7 3 R1, R2, R4 RES 2MΩ 1/16W 1% 0402 SMD VISHAY, CRCW04022M00FKED
8 1 L1 INDUCTOR, 10µH, ±20% COILCRAFT, XAL4040-103ME
9 1 U1 25V, 600mA BUCK-BOOST DC/DC CONVERTER LINEAR TECHNOLOGY, LTC3130UDC-1 #PBF
Additional Demo Board Circuit Components
10 0 C3, C14 CAP, 1210 (OPT)
11 0 C4 CAP ALUM 220μF 35V 20% SMD (OPT) PANASONIC, EEE-FP1V221AP
12 0 C13 CAP, 0603 (OPT)
13 0 R3, R5, R6 RES, 0402 (OPT)
14 0 D1 DIODE SCHOTTKY 40V 2A SOD123 (OPT) ROHM, RB068M-40TR
15 6 E1 – E6 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0
16 6 JP1 – JP6 JMP, 3-PIN 1 ROW 0.079" CC SULLINS, NRPN031PAEN-RC
17 6 XJP1 – XJP6 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G
18 4 SPACER STACKING #4 SCREW NYLON 0.500" KEYSTONE, 8833

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dc2397af
DEMO MANUAL DC2397A
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
10uH
NOTES: 1) Connect GND of R3, R6, C11, C12 and C13 directly to pins 7 and 8. Connect pins 7 and 8 to IC Pad directly under IC. Connect pins 18 and 19 to copper plane and IC pad directly under IC.
UNLESS NOTED: RESISTORS: OHMS, 0402, 1% CAPACITORS: 0603
VCC
GND
VCC GND
LTC3130-1
VCC
GND
VCC GND VCC
JP2 / VS1 JP3 / VS2
GND
*VOUT JUMPER CONFIGURATION
VOUT
1.8V 5.0V 12VVCC 3.3V
GND
12.0V / 600mA
INT
EXT
ON
OFF
NOTE: FOR MPPC, REMOVE R4 AND POPULATE R5 AND R6. DO NOT ALLOW MPPC PIN VOLTAGE TO EXCEED 6.0V.
OFF
ON
BURST MODE
FIXED FREQ
*
VIN > 13V
VIN
VOUT
RUN
VS1
MODE
VS2
PGOOD MPPC
EXTVcc
VS2VS1
PGOOD
VCC
VCC
EXTVcc VOUT
VIN
RUN
VCC
MPPC
VIN
MODEVCC
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
DEMO CIRCUIT 2397A
11
DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT
N/A
LTC3130UDC-1
NC
J.NOON
05- 23 - 16
25V, 600mA BUCK-BOOST
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
DEMO CIRCUIT 2397A
11
DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT
N/A
LTC3130UDC-1
NC
J.NOON
05- 23 - 16
25V, 600mA BUCK-BOOST
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
DEMO CIRCUIT 2397A
11
DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT
N/A
LTC3130UDC-1
NC
J.NOON
05- 23 - 16
25V, 600mA BUCK-BOOST
REVISION HISTORY DESCRIPTION DATE
APPROVED
ECO REV
JIM N.PRODUCTION
-3 05 - 23 - 16
REVISION HISTORY DESCRIPTION DATE
APPROVED
ECO REV
JIM N.PRODUCTION
-3 05 - 23 - 16
REVISION HISTORY DESCRIPTION DATE
APPROVED
ECO REV
JIM N.PRODUCTION
-3 05 - 23 - 16
L1
XAL4040-103ME
C10
0.1uF
E4 VOUT
C7
22uF
25V
1210
C5
1uF
0805 50V
E2
GND
E5 GND
C8
22uF
25V
1210
E6 GND
JP6
EXTVcc
JP4
MPPC
D1 OPT
+
C4 OPT
R5
OPT
R6 OPT
C9
0.1uF
JP5
RUN
R4 2MEG
C11
4.7uF 6.3V
C6 1uF 0805
50V
JP2
VS1
C2 10uF
50V
1210
JP3
VS2
C13
OPT
C12 4.7uF 50V 0805
E1
VIN
2.4V-25V
C3 OPT
1210
E3
PGOOD
R2 2MEG
U1
LTC3130UDC-1
SVIN
3
SW1 20
VOUT 14
SW2 15
VS1
10
MODE
11
GND
8
VS2
9
PGND
19
RUN
4
BST1 1
BST2 16
GND
7
PGND
18
MPPC 6
EXTVCC 12
VCC 5
GND
21
NC
17
PGOOD 13
PVIN
2
R1
2MEG
R3
OPT
C14
OPT
1210
JP1
MODE
C1
1uF
0805 50V

6
dc2397af
DEMO MANUAL DC2397A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
LT 0816 • 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
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

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