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DESCRIPTION
Demonstration circuit 1523A features the LTC
a high efficiency switching step-up/down controller. The
DC1523A input range is from 5V to 36V. The output volt-
age is 12V. The board is capable of delivering up to 5A of
output current over the input voltage range.
The LTC3789EGN is a high performance switching regula-
tor controller designed to regulate the output using input
voltages above, below or equal to the output voltage.
Synchronous operation provides very high efficiency, up
to 97%. Constant frequency current mode architecture
allows phase-lockable frequency from 200kHz to 600kHz.
An accurate output current limit provides support for
battery charging. A wide input and output range with
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V
Regulation
OUT
Maximum Continuous Output Current
Default Operating Frequency
External Clock Synchronous Frequency Range
Effi ciency
Load Transient
DEMO MANUAL DC1523A
High Efficiency Synchronous
4-Switch Step-Up/Step-Down
3789EGN,
smooth transfer function through all operating modes
®
makes the product ideal for automotive, telecom and
battery systems.
The MODE/PLLIN pin can select between pulse skipping
mode and forced continuous mode operation and allows
the IC to be synchronized to an external clock. A Power
Good output pin indicates when the output is within 7.5%
of its set point.
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.
CONDITIONS/ NOTES
V
= 5V to 36V, I
= 0A to 5A
IN
OUT
Some Airfl ow May be Needed at Low Input
Voltage and Continuous Full Load
R3 = 121k
V
= 5V to 36V, I
= 5A
IN
OUT
LTC3789EGN:
DC/DC Converter
VALUE
5V
36V
12V ±2%
5A DC
400kHz
200kHz to 600kHz
88% to 97%. See Figures 3 and 6
See Figure 5
dc1523af
1
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Related Manuals for Linear Technology DC1523A
Summary of Contents for Linear Technology DC1523A
- Page 1 200kHz to 600kHz. An accurate output current limit provides support for L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear battery charging. A wide input and output range with Technology Corporation. All other trademarks are the property of their respective owners.
-
Page 2: Quick Start Procedure
DEMO MANUAL DC1523A QUICK START PROCEDURE Demonstration circuit 1523A is easy to set up to evalu- 4. Turn on the power at the input. Increase V to between ate the performance of the LTC3789EGN. Please refer to 5V and 36V. The circuit will start and the output voltage Figure 1 for proper measurement equipment setup and will regulate at 12V ±2%. - Page 3 DEMO MANUAL DC1523A QUICK START PROCEDURE EFFICIENCY POWER LOSS DC1523A F02 DC1523A F03 Figure 2. Input Current at Full Load (12V at 5A Out) Figure 3. Efficiency and Power Loss at Full Load. The Power Loss is Highest in Boost Mode Due to the High Inductor Current, and Drops as Input Voltage Increases.
- Page 4 DEMO MANUAL DC1523A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP ., C0G, 1000pF , 50V, 10% 0603 AVX, 06035A102KAT2A CC2, CSS CAP ., X7R, 0.01μF , 50V, 10% 0603 AVX, 06035C103KAT2A CIN1 CAP ., Alum, 270μF , 50V, 20%...
-
Page 5: Parts List
DEMO MANUAL DC1523A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Additional Demo Board Circuit Components C3, C23, C26, C27 OPT CAP ., 1210 CIN2 CAP ., Alum, OPT CF1, C11, CF , C7, C8 OPT CAP ., 0603 COUT2 OPT Q6 OPT Dual N-CHAN., Si7948DP , 60V... -
Page 6: Schematic Diagrams
DEMO MANUAL DC1523A SCHEMATIC DIAGRAMS dc1523af... - Page 7 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.
- Page 9 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC1523A...
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