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Linear Technology LT3507A Demo Manual

Triple monolithic step-down regulator with ldo
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DESCRIPTION
Demo circuit 1781A is a Triple Monolithic Step-Down Regu-
lator with LDO featuring the LT3507A. The demo circuit
is designed for 1.8V, 3.3V, 5.0V and 2.5V outputs from a
7V to 36V input. The current capability of each channel
is 2.7A, 1.5A, 1.8A and 0.3A respectively. Independent
input voltage, feedback, soft-start and power good pins
for each channel simplify complex power supply tracking/
sequencing requirements.
All three converters are either synchronized to a common
external clock input or single-resistor programmable from
250kHz to 2.5MHz using internal oscillator. At all frequen-
cies, a 180° phase shift between V
outputs is maintained, reducing input voltage ripple and
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V
OUT1
Output Voltage V
OUT2
Output Voltage V
OUT3
Output Voltage V
OUT4
Switching Frequency
Maximum Output Current I
OUT1
Maximum Output Current I
OUT2
Maximum Output Current I
OUT3
Maximum Output Current I
OUT4
Voltage Ripple V
OUT1
Voltage Ripple V
OUT2
Voltage Ripple V
OUT3
Voltage Ripple V
OUT4
Triple Monolithic Step-Down
and the other two
OUT1
(T
= 25°C)
A
CONDITIONS
V
= 7~36V
IN
V
= 7~36V
IN
V
= 7~36V
IN
V
= 7~36V
IN
V
= 7~36V
IN
V
= 7~36V
IN
V
= 7~36V
IN
V
= 7~36V
IN
V
= 12V, I
= 2.7A
IN
OUT1
V
= 12V, I
= 1.5A
IN
OUT2
V
= 12V, I
= 1.8A
IN
OUT3
V
= 12V, I
= 0.3A
IN
OUT4
DEMO MANUAL DC1781A
Regulator with LDO
component size. Programmable frequency allows for opti-
mization between efficiency and external component size.
Each output can be independently disabled using its own
soft-start pin, or by using the SD terminal the entire part
can be placed in a low quiescent current shutdown mode.
The LT3507A data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demo circuit 1781A.
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.
VALUE
7V
36V
1.80V ±3%
3.33V ±3%
5.0V ±3%
2.52V ±3%
450kHz ±10%
2.7A
1.5A
1.8A
0.3A
<20mV
<20mV
<20mV
<10mV
LT3507A
dc1781af
1

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Summary of Contents for Linear Technology LT3507A

  • Page 1 OUT1 outputs is maintained, reducing input voltage ripple and 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 = 25°C)

  • Page 2: Quick Start Procedure

    Demo circuit 1781A is easy to set up to evaluate the 2. Turn on the power at the input. performance of the LT3507A. Refer to Figure 2 for proper NOTE. Make sure that the input voltage does not ex- measurement equipment setup and follow the procedure ceed 36V.
  • Page 3 DEMO MANUAL DC1781A QUICK START PROCEDURE Figure 2. DC1781A Proper Equipment Setup Figure 3. Measuring Input or Output Ripple dc1781af...

  • Page 4: Sync Function

    DEMO MANUAL DC1781A QUICK START PROCEDURE SYNC FUNCTION EMI FILTER Install a 10k R20 resistor if the board is synchronized from Install EMI filters on the backside of the DC1781A, how- an external signal generator. ever, a trace cut is required for the insertion of the option circuit.

  • Page 5: Parts List

    DEMO MANUAL DC1781A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN1, CIN2, CIN3 CAP ., X7R, 2.2μF , 50V, 10%, 1210 TDK, C3225X7R1H225K CAP ., X7R, 0.47μF , 25V, 10%, 0603 MURATA, GRM188R71E474KA12D C2, C9 CAP ., X7R, 0.22μF , 25V, 10%, 0603 TDK, C1608X7R1E224K C3, C10 CAP ., X5R, 47μF , 10V, 20%, 1206...
  • Page 6 DEMO MANUAL DC1781A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Additional Demo Board Circuit Components CIN4 CAP ., ELECTROLYTIC, 22μF , 50V SANYO, 50CE22LX C14, C16, C18, C28 CAP ., 0402 CAP ., X7R, 0.01μF , 50V, 10%, 0603 CAP ., X7R, 2.2μF , 50V, 10%, 1210 CAP ., ELECTROLYTIC, 22μF 50V C24-C27...

  • Page 7: 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 8 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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