1
dc1922af
DEMO MANUAL DC1922A
Description
LTC3129
15V, 200mA Synchronous Buck-Boost DC/DC Converter
with 1.3µA Quiescent Current
Demonstration Circuit 1922A features the
LTC
®
3129
, a
high efficiency 200mA buck-boost DC/DC converter with
a wide V
IN
and V
OUT
range.
The DC1922A demo board has two user selectable operat-
ing 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 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
OUT
thermal
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
as low as 1.92V provided V
CC
is back-
fed. The demo board has optional provisions to back-
feed V
CC
(D1) in order to increase efficiency in some 5V
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.
output applications, or to allow operation with V
IN
down
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.
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
performance summary
Specifications are at T
A
= 25°C
PARAMETER
VALUE
Input Voltage Range
2.42V to 15V
V
OUT
5.0V
I
OUT
(See Note 1)
200mA, for V
IN
> V
OUT
Efficiency
See Figure 1
NOTE 1: The demo board output current is a function of V
IN
. Please refer to the data sheet for more information.
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