Linear Technology DC1980A Demo Manual
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Linear Technology DC1980A Demo Manual

Triple step-down switching regulator with 100% duty cycle operation
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Description
Demonstration circuit 1980A is a triple current mode PWM
step-down DC/DC converter featuring the
demo circuit is designed for 5V, 3.3V and 1.8V outputs
from a 5.4V to 36V input. The current capability of 5V
and 1.8V outputs is 1A and the 3.3V output is capable of
2A output. Individual soft-start and current limit for each
output as well as frequency synchronous function simplify
the complex design of triple-output power converters.
Each converter is synchronized to either a common ex-
ternal clock input or a resistor programmable 250kHz to
2.2MHz internal oscillator. Programmable frequency allows
optimization between efficiency and external component
size. Each output can be independently disabled using its
own RUN/SS pin.
The LT3514 data sheet gives complete description of the
device, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for the demo circuit 1980A.
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.
performance summary
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Output Voltage 1
OUT1
V
Output Voltage 3
OUT3
V
Output Voltage 4
OUT4
Frequency
Switching Frequency
I
V
Maximum Output Current
OUT1
OUT1
DEMO MANUAL DC1980A
Triple Step-Down Switching Regulator
with 100% Duty Cycle Operation
LT
3514. The
®
Figure 1. System Efficiency at f = 1MHz with I
and I
OUT3
Figure 2. Thermal Image at V
I
Specifications are at T
CONDITIONS
V
= 12V
IN
V
= 5.4V ~ 36V
IN
100
95
90
85
80
75
70
65
60
5
10
15
20
25
V
(V)
IN
= 2A
IN
= I
= 1A and I
= 2A
OUT1
OUT4
OUT3
= 25°C
A
MIN
5.4
4.85
3.2
1.746
0.9
1
LT3514
30
35
40
DC1980a F01
= I
= 1A
OUT1
OUT4
DC1980a F02
= 12V, f = 1MHz with
TYP
MAX
UNITS
36
V
5
5.15
V
3.3
3.4
V
1.8
1.854
V
1
1.1
MHz
A
dc1980af
1

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Summary of Contents for Linear Technology DC1980A

  • Page 1 1980A. 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. DC1980a F02 Figure 2.

  • Page 2: Performance Summary

    DEMO MANUAL DC1980A performance summary Specifications are at T = 25°C SYMBOL PARAMETER CONDITIONS UNITS Maximum Output Current = 5.4V ~ 36V OUT3 OUT3 Maximum Output Current = 5.4V ~ 36V OUT4 OUT4 VOUT1(AC) VOUT1 Output Ripple VIN = 5.4V ~ 36V, I...
  • Page 3 DEMO MANUAL DC1980A Quick start proceDure DC1980a F03 Figure 3. DC1980A Proper Equipment Setup OR V DC1980A F04 Figure 4. Measuring Input or Output Ripple dc1980af...

  • Page 4: Parts List

    DEMO MANUAL DC1980A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP, X5R, 22µF, 6.3V, 10% 0805 TDK, C2012X5R0J226K CAP, X5R, 47µF, 6.3V, 10% 1206 MURATA, GRM31CR60J476KE19L CAP, X5R, 22µF, 10V, 10% 0805 TDK, C2012X5R1A226K CAP, 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. DC1980A...

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