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DESCRIPTION
Demonstration circuit 1489A is a 65V input, 500mA output
DC/DC power supply featuring the LTC3630. The IC operates
in a high efficiency Burst Mode
internal high and low side switches. The board will accept
an input voltage between 4V and 65V, and provide jumper
selected output voltages of 1.8V, 3.3V, 5V and an option
for additional voltages. The IC includes internal soft-start
and a provision for increasing soft-start time.
Included on the board is an ON/OFF jumper that can also
be configured as a precision undervoltage lockout. Ad-
ditional PC pads are included for programming current
limit to optimize efficiency and for reducing output voltage
ripple and reducing component size. A terminal (FBO)
PERFORMANCE SUMMARY
Table 1. Circuit Specifications
PARAMETER
Input Voltage Range
1.8V Output
3.3V Output
5V Output
Maximum Output Current
Typical Output Voltage Ripple
Synchronous Step-Down Converter
®
operation and includes
(T
= 25°C)
A
CONDITIONS
V
= 20V, V
Load = 100mA
IN
OUT
V
= 20V, V
Load = 100mA
IN
OUT
V
= 20V, V
Load = 100mA
IN
OUT
V
= 20V, V
= 5V
IN
OUT
V
= 20V, V
= 5V
IN
OUT
DEMO MANUAL DC1849A
High Efficiency 65V 500mA
is included to allow multiple boards to be paralleled for
increase output current.
Output voltage between 800mV and V
using optional resistors, although higher voltage output
capacitors will be required.
The LTC3630 data sheet gives a complete description of the
IC operation and application information. The data sheet
must be read in conjunction with this quick start guide.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
LTC3630EMSE
can be programmed
IN
VALUE
4V to 65V
1.8V ±2%
3.3V ±2%
5V ±2%
500mA
75mV
P-P
dc1849af
1
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Related Manuals for Linear Technology DC1849A
Summary of Contents for Linear Technology DC1849A
- Page 1 PC pads are included for programming current limit to optimize efficiency and for reducing output voltage L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks ripple and reducing component size. A terminal (FBO) of Linear Technology Corporation.
-
Page 2: Quick Start Procedure
DEMO MANUAL DC1849A QUICK START PROCEDURE This demonstration circuit 1849A can be evaluated using power supply that has more than 40V present at it’s the setup shown in Figure 1. output can produce a high voltage transient that may exceed the absolute maximum input voltage. These 1. - Page 3 DEMO MANUAL DC1849A QUICK START PROCEDURE Circuit Options R4 can be used to set input current limit. C3 is used to reduce output voltage ripple and optimize efficiency. See Detailed information is contained in the data sheet. data sheet for details.
- Page 4 DEMO MANUAL DC1849A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components: CAP , 0805 220nF 10% 100V X7R MURATA GRM21AR72A224KAC5L CAP , 2220 4.7μF 20% 100V X7R TDK C5750X7R2A475M CAP , 0603 220pF 10% 50V X7R AVX 06035C221KAT2A...
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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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