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15V, 200mA Synchronous Buck-Boost DC/DC Converter
Description
Demonstration Circuit 1922A features the
high efficiency 200mA buck-boost DC/DC converter with
a wide V
and V
IN
OUT
The DC1922A demo board has two user selectable operat-
ing modes: Burst Mode
PWM (JP3). There is also an accurate programmable
RUN pin which is used to ENABLE the converter (JP1).
The LTC3129 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 Z
electric generators (TEGs).
The DC1922A operates with a 2.42V to 15V input voltage
range, and has been designed with the output voltage set
to 5.0V. Once the converter is started the LTC3129 can
operate with V
IN
fed. The demo board has optional provisions to back-
feed V
(D1) in order to increase efficiency in some 5V
CC
performance summary
PARAMETER
Input Voltage Range
V
OUT
I
(See Note 1)
OUT
Efficiency
NOTE 1: The demo board output current is a function of V
Arrow.com.
Downloaded from
range.
Operation and Fixed Frequency
®
as low as 1.92V provided V
VALUE
2.42V to 15V
5.0V
200mA, for V
See Figure 1
DEMO MANUAL DC1922A
with 1.3µA Quiescent Current
LTC
3129, a
output applications, or to allow operation with V
®
to 1.92V. Consult the data sheet for more information on
these options.
The DC1922A demo board also incorporates a connector
(J1) which can be used to connect to a Dust Networks
Mote demo board.
Figure 1 shows typical demo board efficiency and Figure 2
shows typical step response.
The LTC3129 data sheet has detailed information about
the operation, specification, and applications of the part.
thermal
OUT
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
is back-
CC
L, LT, LTC, LTM, 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.
Specifications are at T
= 25°C
A
> V
IN
OUT
. Please refer to the data sheet for more information.
IN
LTC3129
down
IN
dc1922af
1
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Related Manuals for Linear Technology LTC3129
Summary of Contents for Linear Technology LTC3129
- Page 1 1.92V provided V is back- L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective fed. The demo board has optional provisions to back- owners.
- Page 2 DEMO MANUAL DC1922A Description DC1922A Efficiency vs Load, V = 5V (AUTOBURST) (PWM) = 3V = 5V = 10V = 15V = 3V = 5V = 10V = 15V 0.01 1000 LOAD (mA) dc1922a F01 Figure 1. DC1922A Efficiency in AUTOBURST MODE Figure 2.
-
Page 3: Quick Start Procedure
DEMO MANUAL DC1922A Quick start proceDure Using short twisted pair leads for any power connections Load current (I ) can also be varied. The maximum and with all loads and power supplies off, refer to Figure 3 is a function of V and the current limit. - Page 4 DEMO MANUAL DC1922A Quick start proceDure For USE with a DUST Networks MOTE demo board: 17. Once the output voltage has been set to the proper voltage and with the power supply OFF connect 15. Connector J1 is designed to interface with a Dust DC1922A to the Dust Networks Mote demo board Networks Mote demo board.
- Page 5 DEMO MANUAL DC1922A Quick start proceDure Figure 5. DC1922A Connected to DC9003 Dust Mote (Top View) Figure 6. DC1922A Connected to DC9003 Dust Mote (Bottom View) dc1922af Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
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Page 6: Parts List
VISHAY, CRCW0402619KFKED RES, CHIP, 2.21k, 1/16W, 1%, 0402 VISHAY, CRCW04022K21FKED 15V, 200mA SYNCHRONOUS BUCK - BOOST DC / DC CONVERTER LINEAR TECHNOLOGY, LTC3129EUD WITH 1.3µA QUIESCENT CURRENT Additional Demo Board Circuit Components CAP TANT 68µF, 20V, 10%, SMD 7343 (OPT) CAP CER 6.3V, 0603 (OPT) -
Page 7: Schematic Diagram
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. - Page 8 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.
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