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DESCRIPTION
Demonstration circuit 1428A features the LT
circuit is designed to convert a 5V to 36V input source to
3.3V at 300mA and 2.5V at 200mA. JP1 and JP2 enable and
disable the 3.3V output and the 2.5V output respectively.
LDO only operates if both, EN/UVLO and EN2 are greater
than 1.2V. Demo board includes an optional resistor, R8,
for easy implementation of UVLO. The LT3645 data sheet
gives a complete description of the part, its operation and
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
3.3V
Buck Output Voltage Accuracy
OUT
2.5V
LDO Output Voltage Accuracy
OUT
Efficiency
Buck V
Ripple
OUT
LDO V
Ripple
OUT
f
Switching Frequency
S
DEMO MANUAL DC1428A
®
3645. The
application information. The data sheet must be read in
conjunction with this quick start guide for working on or
modifying the demo circuit 1428A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
(T
= 25°C)
A
CONDITIONS
V
= 5V to 36V, I
= 500mA
IN
LOAD
V
= 5V to 36V, I
= 200mA
IN
LOAD
V
= 5V, I
= 500mA for Buck, 0mA for LDO
IN
LOAD
V
= 5V, I
= 300mA for Buck, 200mA for LDO
IN
LOAD
V
= 5V, I
= 500mA
IN
LOAD
V
= 5V to 36V, I
= 200mA
IN
LOAD
0.5A, 36V Step-Down
Regulator with LDO
MIN
TYP
5
3.226
3.3
2.444
2.5
83
75
10
1
750
LT3645
MAX
UNITS
36
V
3.374
V
2.556
V
%
%
mV
mV
kHz
dc1428af
1
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Related Manuals for Linear Technology DC1428A
Summary of Contents for Linear Technology DC1428A
- Page 1 1.2V. Demo board includes an optional resistor, R8, L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of for easy implementation of UVLO. The LT3645 data sheet Linear Technology Corporation. All other trademarks are the property of their respective owners.
-
Page 2: Quick Start Procedure
DEMO MANUAL DC1428A QUICK START PROCEDURE Demonstration circuit 1428A is easy to set up to evaluate 2. With power off, connect the input power supply to V the performance of the LT3645. Refer to Figures 1 and 2 and GND. Apply 5V to input and check for the proper for proper measurement equipment setup and follow the output voltages. - Page 3 DEMO MANUAL DC1428A Figure 1. DC1428A Proper Equipment Set-Up Figure 2. Proper Input/Output Ripple Measurement Technique dc1428af...
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Page 4: Parts List
DEMO MANUAL DC1428A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components Capacitor, X7R, 0.1μF , 10V, 10%, 0603 AVX, 0603ZC104KAT2A Capacitor, Tantalum, 10μF , 63V Suncon, 63CE10BS Capacitor, X7R, 1μF , 50V, 10%, 1206 Murata, GCM31MR71H105KA55L Capacitor, X5R, 10μF , 6.3V, 0805 AVX, 08056D106MAT2A Capacitor, X5R, 2.2μF , 6.3V, 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.
- Page 7 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC1428A...
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