DC1923A - Demo Manual

DEMO MANUAL DC1923A
LTC3129-1
15V, 200mA Synchronous Buck-Boost DC/DC
Converter with 1.3µA Quiescent Current
Description
Demonstration circuit 1923A features the LTC3129-1, a
high efficiency 200mA buck-boost DC/DC converter with
a wide VIN and VOUT range.
Once the converter is started the LTC3129-1 can operate
with VIN as low as 1.92V provided VCC is back-fed. Consult
the data sheet for more information on these options.
The DC1923A demo board has two user selectable operating modes: Burst Mode® operation and fixed frequency
PWM (JP3). There is also an accurate programmable RUN
pin which is used to ENABLE the converter (JP1). The
LTC3129-1 also incorporates a maximum power point
control function which can be enabled (JP2) for applications
where the input source is a solar cell or is high impedance, such as intrinsically safe applications or high ZOUT
thermal electric generators (TEGs). The LTC3129-1 also
features fixed output voltages with eight user-selectable
settings (JP4, JP5, JP6). This allows the user to eliminate
the output voltage divider and the associated bias current.
The DC1923A demo board also incorporates a connector
(J1) which can be used to connect to a Dust Networks®
mote demo board.
The DC1923A operates with a 2.42V to 15V input voltage
range, and has been designed with the output voltage set
to 5V. The demo board can be programmed to any of the
eight voltage settings by using jumpers JP4, JP5, and JP6.
Performance Summary
Figure 1 shows typical demo board efficiency and Figure 2
shows typical step response.
The LTC3129-1 data sheet has detailed information about
the operation, specification, and applications of the part.
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
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, Dust Networks and Dust are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Specifications are at TA = 25°C
PARAMETER
Input Voltage Range
VOUT
IOUT (see Note 1)
Efficiency
TYPICAL
2.42V to 15V
5V; 8 User Selectable Voltages
200mA, for VIN > VOUT
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 DC1923A
Description
DC1923A Efficiency vs Load, VOUT = 5V
100
AutoBURST
90
EFFICIENCY (%)
80
70
60
50
40
30
PWM
VIN = 3V
VIN = 5V
VIN = 10V
VIN = 15V
20
10
0
0.01
0.1
1
10
LOAD (mA)
100
1000
Figure 1. DC1923A Efficiency
Figure 2. DC1923A 50mA to 100mA Output Step Response
Quick Start Procedure
Using short twisted pair leads for any power connections
and with all loads and power supplies off, refer to Figure 3
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 oscilloscope probe. Measure the input or output voltage ripple
by touching the probe tip directly across the VIN or VOUT
and GND terminals (see Figure 4), or by using an oscilloscope probe tip jack.
1. Jumper, PS1 and LOAD settings to start:
PS1:
OFF
JP1:
RUN
ON
JP2:
MPPC
OFF
JP3:
PWM
BURST MODE
JP7:
DUST PWR NC
To set VOUT = 5V
JP4:
VS1
VCC
JP5:
VS2
VCC
JP6:
VS3
GND
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DEMO MANUAL DC1923A
Quick Start Procedure
2. With power OFF connect the power supply (PS1) as
shown in Figure 3. If accurate current measurements
are desired (for efficiency calculations for example) then
connect an ammeter (AM1) in series with the supply
as shown. The ammeter is not required however.
3. Connect a 50mA load to VOUT as shown in Figure 3
(100Ω for VOUT = 5V). Connect an ammeter (AM2)
if accurate current measurement or monitoring is
desired.
13.With no load and the MPPC voltage set, increase the
source voltage above the MPPC set point. VOUT should
be in regulation. As the load is increased VIN will drop
until it reaches the MPPC set voltage. As the load is
increased further, VOUT will drop out of regulation,
but VIN will be regulated to the set point voltage. This
is to prevent the input source from collapsing and to
allow the maximum power to be extracted from the
source.
4. Turn on PS1 and slowly increase voltage until the
voltage at VIN is 4V.
14.Consult the data sheet for more information on maximum power point control (MPPC) operation.
5. Verify VOUT is ~5V.
For USE with a DUST Networks MOTE demo board:
6. VIN can now be varied between 2.42V and 15V. VOUT
should remain in regulation.
15.Connector J1 is designed to interface with a Dust
Networks mote demo board. Consult the Dust®
documentation for optimal VOUT regulation setting.
In general the Dust Networks mote will operate with
VOUT set to 3.3V. However, care should be taken to
not overvoltage the mote. Newer motes may require
a different VOUT. The DC1923A demo board can be
configured for different VOUT voltages by simply
changing jumpers JP4, JP5 and JP6. To configure the
board for 3.3V set the jumpers as follows:
7. Load current (IOUT) can also be varied. The maximum
IOUT is a function of VIN and the current limit. Consult
the data sheet for more information on IOUT vs VIN.
In general for VIN > VOUT IOUT can be increased to
200mA. For VIN < VOUT IOUT capability will be reduced.
8. For operation in fixed frequency (PWM) mode move
Jumper JP3 to FIXED FREQ. See the data sheet for
more information on Burst Mode operation.
9. NOTE: If VOUT drops out of regulation, check to be
sure that VIN is not below the minimum value for
regulation (see data sheet).
For USE with a Solar Cells/MPPC:
10.With power OFF move jumper MPPC (JP2) to ON.
11.If using a power supply as the source, place a minimum of 10Ω, 10W resistor in series with the input to
simulate the source resistance. If using a solar cell(s)
or high impedance source, no additional resistance
should be needed.
12.Set resistor R6 to a value which will set the MPPC
pin to the desired voltage. See the data sheet section
Programming the MPPC Voltage for more information.
JP4:
VS1
VCC
JP5:
VS2
GND
JP6:
VS3
GND
16.Once the output voltage has been set to the proper voltage and with the power supply OFF connect DC1923A
to the Dust Networks mote demo board using J1.
See Figures 5 and 6 for the proper connections and
orientation. Move jumper JP7 to VOUT.
17.Once the boards have been connected, turn on PS1
and increase the voltage to approximately 3V. VOUT
should now be in regulation. VIN can now be varied
over the operating range and VOUT should remain in
regulation.
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DEMO MANUAL DC1923A
Quick Start Procedure
Figure 3. Proper Measurement Equipment Setup
GND
VIN
Figure 4. Measuring Input or Output Ripple
Figure 5. DC1923A Connected to DC9003A Dust Mote (Top View)
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DEMO MANUAL DC1923A
Quick Start Procedure
Figure 6. DC1923A Connected to DC9003A Dust Mote (Bottom View)
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
C1
CAP CER 22µF 25V X5R 20% 1210
TDK, C3225X5R1E226M
2
2
C2, C4
CAP CER 1µF 25V X5R 0603
TDK, C1608X5R1E105M
3
1
C3
CAP CER 10µF 25V X5R 1210
TDK, C3225X5R1E106M
4
2
C5, C6
CAP CER 22000pF 50V X7R 10% 0603
TDK, C1608X7R1H223K
5
1
C9
CAP CER 2.2µF 10V X7R 20% 0603
TDK, C1608X7R1A225M
6
1
C10
CAP CER 10pF 50V NP0 ±0.25pF 0603
TDK, C1608C0G1H100C
7
1
L1
INDUCTOR, 10µH
COILCRAFT, EPL3015-103
8
1
Q1
N-CHANNEL MOSFET, 20V, SOT23
DIODES/ZETEX, ZXMN2F30FHTA
9
3
R1, R2, R4
RES, CHIP, 2M, 1/16W, 1%, 0402
VISHAY, CRCW04022M00FKED
10
1
U1
15V, 200mA SYNCHRONOUS BUCK-BOOST DC/DC
CONVERTER WITH 1.3µA QUIESCENT CURRENT
LINEAR TECHNOLOGY, LTC3129EUD-1
CAP CER 0603
OPT
Additional Demo Board Circuit Components
1
0
C7 (OPT)
2
0
C8 (OPT)
CAP TANT 68µF 20V 10% SMD 7343
OPT
3
0
R3, R5, R6 (OPT)
RES 1/10W 1% 0402 SMD
OPT
Hardware: For Demo Board Only
1
5
E1, E2, E3, E4, E5
TESTPOINT, TURRET 0.094"
MILLMAX 2501-2-00-80-00-00-07-0
2
1
J1
HEADER, 2X6, 12-PIN, SMT HORIZONTAL SOCKET w/KEY,
0.100"
SAMTEC, SMH-106-02-L-D-05
3
7
JP1-JP7
JMP, 0.079" SINGLE ROW HEADER, 3 PIN
SAMTEC, TMM-103-02-L-S
4
7
XJP1-XPJP7
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
5
4
(STAND-OFFS)
STAND-OFF, NYLON 0.625" TALL
KEYSTONE, 8834(SNAP ON)
dc1923af
5
A
B
C
D
ON
JP1
E2
JP2
JP3
VCC PWM
R6
OPT
R3
OPT
C8
OPT
7343
MPPC
R4
2M
R2
2M
PWM
VIN
VIN
+
VIN
C7
OPT
6.3V
R5
OPT
C10
10pF
RUN
C1
22uF
25V
1210
C2
1uF
25V
5
1. ALL RESISTORS ARE IN OHMS, 0402
ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTE: UNLESS OTHERWISE
SPECIFIED
BURST MODE
FIXED FREQ
VCC
ON
OFF
MPPC
OFF
RUN
GND
VIN
2.4V - 15V
E1
VCC
VS1
VCC
GND
JP5
VS2
VS2
4
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
JP4
VS1
3
MPPC
RUN
VIN
U1
LTC3129EUD-1
VCC
VCC
5
4
2
C5
22nF
50V
L1
EPL3015 -103
3
13
JP6
SCALE = NONE
J.NOON
NC
APPROVALS
VCC
GND
9
8
7
10
11
12
VS3
VS1
VS2
VS3
PWM
PGOOD
VOUT
C6
22nF
50V
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
VCC
GND
C9
2.2uF
MPPC
RUN
4
1
BST1
16
SW1
GND
6
GND
17
14
SW2
15
BST2
6
PGND
5
DESCRIPTION
R1
2M
GND
C3
10uF
25V
1210
C4
1uF
25V
GND
VCC
GND
GND
GND
VCC
GND
GND
GND
GND
VCC
VCC
VCC
VCC
VCC
TECHNOLOGY
VCC
GND
DATE
GND
PGOOD
15V
8.2V
12V
6.9V
5.0V
3.3V
4.1V
2.5V
LTC3129 - 1
VOUT
E4
E5
5.0V / 200mA
VIN > VOUT
* VOUT
01 - 02 - 13
2
DATE: 01 - 02 - 13
1
1
OF
1
15V, 200mA SYNCHRONOUS BUCK - BOOST DC / DC
CONVERTER WITH 1.3uA QUIESCENT CURRENT
IC NO.
REV.
SIZE
LTC3129EUD-1
N/A
2
DEMO CIRCUIT 1923A
SHEET
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
VCC
GND
GND
VCC
VCC
VCC
JP4 / VS1
JP5 / VS2
E3
J.NOON
VOUT
GND
1
APPROVED
* VOUT JUMPER CONFIGURATION
VOUT
PRODUCTION FAB
REVISION HISTORY
JP6 / VS3
TITLE: SCHEMATIC
VS3
VS1
VS2
VS3
PWM
2
-
PGOOD
REV
ECO
2
A
B
C
D
DEMO MANUAL DC1923A
Schematic Diagram
dc1923af
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.
A
B
C
5
1
JP7
4
NC
SCALE = NONE
J.NOON
Figure 7. Circuit Schematic
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
PGOOD
APPROVALS
SMH-106-02-L-D-05
2
VSUPPLY
NC 4
GND
PGOOD 6
KEY
VBAT 8
RSVD
EHORBAT 10
I/O 2
I/O 1 12
+5V
V+
CUSTOMER NOTICE
Q1
ZXMN2F30FH
1
3
5
7
9
11
J1
CAUTION: ONLY
CONNECT IF VOUT IS
CONFIGURED FOR 3.3V
3
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
PGOOD
NC
DUST PWR VOUT
VOUT
4
3
2
D
5
GND
PGOOD
VOUT
TECHNOLOGY
SHEET
2
OF
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
PGOOD
VOUT
1
2
DATE: 01 -02 - 13
1
15V, 200mA SYNCHRONOUS BUCK - BOOST DC / DC
CONVERTER WITH 1.3uA QUIESCENT CURRENT
IC NO.
REV.
SIZE
LTC3129EUD-1
N/A
2
DEMO CIRCUIT 1923A
TITLE: SCHEMATIC
2
A
B
C
D
DEMO MANUAL DC1923A
Schematic Diagram
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DEMO MANUAL DC1923A
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
dc1923af
8
Linear Technology Corporation
LT 0513 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013
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