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Linear Technology DC1207A Demo Manual

Lt3504 quad 40v/1a step-down switching regulator with 100% duty cycle operation
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DESCRIPTION
The demo circuit 1207A is a quad current mode PWM step-
down DC/DC converter featuring the LT
circuit is designed for 5V, 3.3V, 2.5V and 1.8V outputs
from a 5.4V to 40V input. The current capability of each
channel is up to 1A. Individual soft-start and current limit
for each output as well as synchronous function simplify
the complex design of quad-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
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Output Voltage 1
OUT1
V
Output Voltage 2
OUT2
V
Output Voltage 3
OUT3
V
Output Voltage 4
OUT4
Frequency
Switching Frequency
I
V
Maximum Output Current
OUT1
OUT1
I
V
Maximum Output Current
OUT2
OUT2
I
V
Maximum Output Current
OUT3
OUT3
I
V
Maximum Output Current
OUT4
OUT4
V
V
Output Ripple
OUT1(AC)
OUT1
V
V
Output Ripple
OUT2(AC)
OUT2
V
V
Output Ripple
OUT3(AC)
OUT3
V
V
Output Ripple
OUT4(AC)
OUT4
DEMO MANUAL DC1207A
Quad 40V/1A Step-Down
100% Duty Cycle Operation
size. Each output can be independently disabled using its
®
3504. The demo
own RUN/SS pin.
The LT3504 data sheet gives a 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 1207A.
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.
Specifications are at T
CONDITIONS
V
= 5.4 ~ 40V
IN
V
= 5.4 ~ 40V
IN
V
= 5.4 ~ 40V
IN
V
= 5.4 ~ 40V
IN
V
= 5.4 ~ 40V, I
IN
OUT1
V
= 5.4 ~ 40V, I
IN
OUT2
V
= 5.4 ~ 40V, I
IN
OUT3
V
= 5.4 ~ 40V, I
IN
OUT4
Switching Regulator with
= 25°C
A
MIN
5.4
4.75
3.135
2.375
1.71
0.9
1
1
1
1
= 1A, BW = 20MHz
= 1A, BW = 20MHz
= 1A, BW = 20MHz
= 1A, BW = 20MHz
LT3504
TYP
MAX
UNITS
40
V
5
5.15
V
3.3
3.40
V
2.5
2.575
V
1.8
1.854
V
1
1.1
MHz
A
A
A
A
20
mV
20
mV
20
mV
20
mV
dc1207af
1

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Summary of Contents for Linear Technology DC1207A

  • Page 1 250kHz to L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear 2.2MHz internal oscillator. Programmable frequency allows Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC1207A DESCRIPTION Figure 1. System Efficiency at f = 1MHz with All Channels Sourcing 1A Current Figure 2. Thermal Image at V = 12V, f = 1MHz with All Channels Sourcing 1A Current QUICK START PROCEDURE 3. Turn on the power at the input.
  • Page 3 DEMO MANUAL DC1207A QUICK START PROCEDURE Figure 3. DC1207A Proper Equipment Setup Figure 4. Measuring Input or Output Ripple dc1207af...
  • Page 4 DEMO MANUAL DC1207A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C1, C2 CAP, 0805 10μF 10% 6.3V X5R AVX 08056D106KAT2A C3, C4 CAP, 1206 22μF 10% 6.3V X5R AVX 12066D226KAT2A CAP, 0603 2.2μF 10% 6.3V X5R...

  • 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.