Linear Technology LTC3130EUD Quick setup guide

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dc2355af
DEMO MANUAL DC2355A
Description
LTC3130EUD
25V, 600mA Buck-Boost DC/DC Converter
with 1.6µA Quiescent Current
Demonstration Circuit 2355A features the LT C
®
3130, a
wide input voltage, wide output voltage operating range,
high efficiency, low noise monolithic DC/DC buck-boost
converter.
The LTC3130 operates from input voltages of 2.4V to 25V.
The demo board has been designed with the output voltage
setto5V.TheLTC3130incorporates 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 DC2355A demo board has two user selectable operat-
ing modes:Burst Mode
®
operation and Fixed Frequency
PWM (JP2). In PWM Mode, the LTC3130 operates at
1.2MHz to allow high efficiency while minimizing the
solution footprint.
The LTC3130 features pin selectable 850mA/450mA aver-
age inductor current limit. To set the current limit to 850mA
set jumper JP1 to “HIGH”. For 450mA current limit set
JP1 to “LOW”. The lower current limit function is useful
when operating from weak, or current limited sources.
A PGOOD open drain output is provided and is pulled
up to VOUT. This output asserts low when VOUT is below
regulation.
An accurate RUN threshold can be set to enable the con-
verter at a desired input voltage. The DC2355A demo board
is set up to use R10 in conjunction with R11 to set this L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode operation are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
performance summary
threshold. Jumper JP4 is provided to pull this input up to
VIN or tie it directly to GND. See the data sheet for details.
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 another
high impedance source. The DC2355A demo board can
be set to operate in MPPC mode by setting jumper JP3
to “ON”, removing R8 and populating R7 and R9. In most
applications this function can also be realized, often with
better efficiency, by using the accurate RUN comparator
functionality. See the data sheet for details.
TheLTC3130 allows the internalVCC 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 (JP5) on the demo board to “EXT” back-feeds VCC
through EXTVCC from VOUT. Setting this jumper to internal
(“INT”) powers VCC from the VIN input. See the data sheet
for additional details.
The LTC3130/LTC3130-1 data sheet has detailed informa-
tion about the operation, specifications, and applications
of 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/DC2355A
Specifications are at TA= 25°C
Input Voltage Range 2.4V to 25V
VOUT 5V
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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DEMO MANUAL DC2355A
Quick start proceDure
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: ILIM HIGH
JP2: MODE FIXED FREQ
JP3: MPPC OFF
JP4: RUN ON
JP5: EXTVCC EXT
2. With power OFF connect the power supply (PS1) as
shown in Figure 4. If accurate current measurements
are desired (forefficiencycalculation for example)then
connect ammeters in series with supplies as shown.
The ammeters are not required however.
3. Connect a 500mA load (10Ω) to VOUT as shown in
Figure 4.
4. Turn on PS1 and slowly increase the voltage until the
voltage at VIN is 5V.
5. Verify VOUT is ~5V.
6. VIN can now be varied between 2.4V and 25V. The
load may need to be reduced for VIN < 5V for VOUT to
remain in regulation.
7. The load can be varied. The maximum load is a func-
tion of VIN and the device current limit. Consult the
data sheet for more information on output current vs
VIN.
8. For operation in Burst Mode, move jumper JP2 to
“BURST MODE”. See the data sheet for more informa-
tion on Burst Mode operation.
9. For operation with the lower current limit move jumper
JP1 to “LOW”. Output current capability is reduced
with the lower current limit. See the data sheet for
more information.
10. For operation with VCC powered from VIN, move jumper
JP5 to “INT”.
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 regulation (see data sheet).
VIN (V)
5
EFFICIENCY (%)
75
85
95
25
DC2355A F01
65
60
55
70
80
90
50
200 10 15
EXTVCC, 600mA LOAD, PWM
INTVCC, 600mA LOAD, PWM
EXTVCC, 50mA LOAD, BURST
INTVCC, 50mA LOAD, BURST
200µs/DIV DC2355A F02
VOUT
200mV/DIV
IOUT
200mA/DIV
Figure 1. DC2355A Typical Efficiency vs Load
with and without Externally Feeding VCC
Figure 2. DC2355A Step Load Response, VIN = 5V.
Load Step Is from 100mA to 400mA
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DEMO MANUAL DC2355A
Quick start proceDure
V
IN
GND
Figure 3. DC2355A Thermal Performance. VIN = 12V, Load = 600mA
Figure 4. Proper Measurement Equipment Setup
Figure 5. Measuring Input or Output Ripple
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DEMO MANUAL DC2355A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C1, C5, C6 CAP., 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., 4.7µF 6.3V 10% X5R 0603 MURATA, GRM188R60J475KE19D
6 1 C12 CAP., 4.7µF 50V 10% X5R 0805 MURATA, GRM21BR61H475KE51L
7 1 C13 CAP CER 22pF 50V C0G 0603 MURATA, GRM1885C1H220JA01D
8 1 R1 RES 1M, 1/10W 1% 0402 VISHAY, CRCW04021M00FKED
9 1 R2 RES 249k, 1/16W 1% 0402 VISHAY, CRCW0402249KFKED
10 1 R3 RES 49.9, 1/10W 1% 0402 VISHAY, CRCW040249R9FKED
11 1 R4 RES SMD 75kΩ 1% 1/10W 0402 VISHAY, CRCW040275K0FKED
12 4 R5, R6, R8, R10 RES SMD 2MΩ 1% 1/16W 0402 VISHAY, CRCW04022M00FKED
13 1 L1 INDUCTOR, 10µH, ±20% COILCRAFT, XAL4040-103ME
14 1 U1 25V, 600mA BUCK BOOST DC/DC CONVERTER LINEAR TECHNOLOGY, LTC3130EUDC#PBF
Additional Demo Board Circuit Components
15 0 C3, C15 CAP, 1210 (OPT)
16 0 C4 CAP ALUM 220µF 35V 20% SMD (OPT) PANASONIC, EEE-FP1V221AP
17 0 C14 CAP, 0603 (OPT)
18 0 R7, R9, R11 RES, 0402 (OPT)
19 0 D1 DIODE SCHOTTKY 40V 2A SOD123 (OPT) ROHM, RB068M-40TR
Hardware: For Demo Board Only
20 6 E1-E6 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0
21 5 JP1-JP5 CONN., HEADER, 1×3, 2mm SULLINS, NRPN031PAEN-RC
22 5 XJP1-XJP5 SHUNT, 2mm SAMTEC, 2SN-BK-G
23 4 STANDOFF, NYLON, SNAP-ON, 0.500" KEYSTONE, 8833
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DEMO MANUAL DC2355A
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
ON
OFF
BURST MODE
FIXED FREQ
HIGH
LOW
OFF
ON
INT
EXT
VIN > 6V
NOTES:
1) Connect GND of R2, R7, R11, C11, C12 and C14 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
NOTE: FOR MPPC, REMOVE R8 AND POPULATE R7 AND R9. DO NOT ALLOW MPPC PIN VOLTAGE TO EXCEED 6.0V.
VIN VOUT
RUN
MODE
MPPC
VCC
VCC MODE
PGOOD VCC
MPPC
VIN VIN
RUN
EXTVcc VOUT
VCC
EXTVcc
PGOOD
ILIM
ILIM
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 CIRCUIT2355A
11
DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT
N/A
LTC3130UDC
NC JN
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 CIRCUIT2355A
11
DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT
N/A
LTC3130UDC
NC JN
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 CIRCUIT2355A
11
DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT
N/A
LTC3130UDC
NC JN
05-23-16
25V, 600mA BUCK-BOOST
REVISION HISTORY DESCRIPTION DATE
APPROVED
ECO REV
JNPRODUCTION
-3 05-23-16
REVISION HISTORY DESCRIPTION DATE
APPROVED
ECO REV
JNPRODUCTION
-3 05-23-16
REVISION HISTORY DESCRIPTION DATE
APPROVED
ECO REV
JNPRODUCTION
-3 05-23-16
C8
22uF
25V
1210
C1
1uF
0805 50V
E3
PGOOD
C7 22uF
25V
1210
E4
VOUT 5.0V / 600mA
C10 0.1uF
D1 OPT
R8 2MEG
C5
1uF
0805 50V
E2
GND
E5 GND
JP4
RUN
E6 GND
R9
OPT
+
C4 OPT
JP3
MPPC
R1
1MEG 1%
L1
XAL4040-103ME
10uH
R4
75k
C15
OPT
1210
JP2
MODE
C11
4.7uF 6.3V
C14
OPT
C6
1uF
0805
50V
R7 OPT
C2 10uF
50V
1210
C3 OPT
1210
R11
OPT
R2
249K
1%
C12 4.7uF 50V 0805
E1
VIN
2.4V-25V R3
49.9
1%
JP1
ILIM
R6 2MEG
JP5
EXTVcc
R10 2MEG
C13
22pF
R5
2MEG
U1
LTC3130UDC
PVIN
2
SW1 20
VOUT 14
SW2 15
ILIM
10
MODE
11
GND
8
FB 9
PGND
19
RUN
4
BST1 1
BST2 16
GND
7
PGND
18
MPPC
6
EXTVCC 12
VCC 5
NC
17
SVIN
3
PGOOD 13
GND
21
C9
0.1uF
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DEMO MANUAL DC2355A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
LT 0916 • 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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