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Description
Demonstration circuit 1887 is a DC/DC supercapacitor
buck-boost charger and balancer converter featuring the
LTC
3128. The DC1887A operates over 1.72V to 5.5V input
®
and charges the output up to 5.5V. Also, the LTC3128 has
2% precision input current limit, which allows the circuit to
operate effectively with current limited input power sources
like the USB. The 1.2MHz switching frequency operation
results in a small and efficient circuit. The converter pro-
vides high output voltage accuracy (typically ±2%) over
a 1.72V to 5.5V input. The demonstration circuit can be
easily modified to generate different output voltages.
performance summary
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
V
OUT
Input Current Limit (Programmable to 3A)
Nominal Switching Frequency
Arrow.com.
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DEMO MANUAL DC1887A
High Efficiency 2-Cell Supercapacitor
Charger and Balancer Converter
The DC1887 has a small circuit footprint. It is a high per-
formance and cost effective solution for charging and
balancing supercapacitors. Please read the LTC3128 data
sheet along with this manual.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, 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
CONDITIONS
I
= 0A to 1A
OUT
I
= 0A to 1A
OUT
V
= 1.72V to 5.5V, I
= 0A
IN
OUT
V
= 1.72V to 5.5V
IN
= 25°C
A
LTC3128
VALUE
1.72V
5.5V
4.2V ±2%
0.9A
1.2MHz
dc1887af
1
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Related Manuals for Linear Technology DC1887A
Summary of Contents for Linear Technology DC1887A
- Page 1 USB. The 1.2MHz switching frequency operation results in a small and efficient circuit. The converter pro- L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
-
Page 2: Quick Start Procedure
DEMO MANUAL DC1887A Quick start proceDure Demonstration circuit 1887 is easy to set up to evaluate NOTE: Make sure that the input voltage V does not the performance of the LTC3128. For proper measure- exceed 5.5V. ment equipment setup refer to Figure 1 and follow the 4. - Page 3 Typical controls the inrush current and output voltage ramp at performance of the DC1887A is shown in Figure 3. As can start-up and during recharge cycles. The input current be seen from Figure 3, the output current decreases as...
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Page 4: Parts List
DEMO MANUAL DC1887A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C2, C3 CAP, X5R, 10µF, 25V, 10%, 0805 AVX, 08053D106KAT2A C1, C4 CAP, X5R, 10µF, 25V, 10%, 1206 MURATA, GRM31CR61E106KA12L CAP, NPO, 120pF, 25V, 10%, 0603... -
Page 5: 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 6 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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