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DESCRIPTION
Demonstration circuit 1731A-A/1731A-B is a step-down
DC/DC converter using LTC3646/LTC3646-1 monolithic
synchronous buck regulator. The input voltage range is
from 4V to 40V. The output voltage range of LTC3646 is
2V to 30V, for LTC3646-1 is 0.6V to 15V. It can deliver up
to 1A of output current. At light load conditions, DC1731A
can operate in Burst Mode
ficiency. The user can choose to use internal or external
compensation. The switching frequency of LTC3646/
LTC3646-1 is programmable from 200kHz to 3MHz. It can
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage V
OUT
Maximum Continuous Output Current
Default Operating Frequency
Efficiency
Load Transient
Arrow.com.
Downloaded from
High Efficiency Low Quiescent Current
®
operation to improve the ef-
Specifications are at T
CONDITIONS/NOTES
Jumper Selectable
V
IN
V
IN
DC1731A-A/DC1731A-B
LTC3646/LTC3646-1
Step-Down Converter
be synchronized to an external clock through the MODE/
SYNC pin. The LTC3646/LTC3646-1 data sheet must be
read in conjunction with this demo manual prior to working
on or modifying demonstration circuit 1731A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
= 25°C
A
= 12V, V
= 5V, I
= 1A
OUT
OUT
= 12V, V
= 5V
OUT
DEMO MANUAL
91.0% See Figure 3
See Figure 4
VALUE
4V to 40V
3.3V, 5V
1A
1.5MHz
dc1731aabf
1
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Summary of Contents for Linear Technology DC1731A-A
- Page 1 ® operation to improve the ef- L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks ficiency. The user can choose to use internal or external of Linear Technology Corporation. All other trademarks are the property of their respective owners.
-
Page 2: Quick Start Procedure
DEMO MANUAL DC1731A-A/DC1731A-B QUICK START PROCEDURE Demonstration circuit 1731A is an easy way to evaluate 3. Turn on the power at the input. Increase V to 12V (Do the performance of the LTC3646/LTC3646-1. Please refer not hot-plug the input supply or apply more than the... - Page 3 DEMO MANUAL DC1731A-A/DC1731A-B QUICK START PROCEDURE INPUT OR OUTPUT CAPACITOR Figure 2. Measuring V or V Ripple LTC3646 Efficiency, V = 3.3V LTC3646 Efficiency , V = 5V = 5V = 12V = 12V = 18V = 18V = 24V...
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Page 4: Parts List
PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components IC, HIGH EFFICIENCY LOW QUIESCENT CURRENT LTC3646EDE FOR DC1731A-A LTC3646EDE-1 FOR STEP-DOWN CONVERTER DC1731A-B CIN2, CIN3 CAP, 1210 10μF 20% 50V X5R TAIYO YUDEN UMK325BJ106MM-T COUT1 CAP, 1210 4.7μF 20% 16V X7R... -
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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