1
dc1923af
DEMO MANUAL DC1923A
Description
LTC3129-1
15V, 200mA Synchronous Buck-Boost DC/DC
Converter with 1.3µA Quiescent Current
Demonstration circuit 1923A features the
LTC3129-1
, a
high efficiency 200mA buck-boost DC/DC converter with
a wide V
IN
and V
OUT
range.
The DC1923A 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
LTC3129-1 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 imped-
ance, such as intrinsically safe applications or high Z
OUT
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 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.
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.
Once the converter is started the LTC3129-1 can operate
with V
IN
as low as 1.92V provided V
CC
is back-fed. Consult
the data sheet for more information on these options.
The DC1923A 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 LTC3129-1 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
performance summary
Specifications are at T
A
= 25°C
PARAMETER
TYPICAL
Input Voltage Range
2.42V to 15V
VOUT
5V; 8 User Selectable Voltages
IOUT (see Note 1)
200mA, for VIN > V
OUT
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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