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Linear Technology DC1161B Demo Manual

Lt3507 triple monolithic step-down regulator with ldo
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DESCRIPTION
Demo circuit 1161B is a triple monolithic step-down
regulator with LDO featuring LT
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 2.4A, 1.3A, 1.4A and 0.2A 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
component size. Programmable frequency allows for opti-
mization between efficiency and external component size.
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
®
3507. The demo circuit
and the other two
OUT1
(T
= 25°C)
A
CONDITION
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 7V ~ 36V
IN
V
= 12V, I
IN
V
= 12V, I
IN
V
= 12V, I
IN
V
= 12V, I
IN
DEMO MANUAL DC1161B
Triple Monolithic Step-Down
Regulator with LDO
Each output can be independently disabled using its own
soft-start pin, or by using the SHDN pin the entire part
can be placed in a low quiescent current shutdown mode.
The LT3507 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 1161B.
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.
= 2.4A
OUT1
= 1.3A
OUT2
= 1.4A
OUT3
= 0.2A
OUT4
LT3507
VALUE
7V
36V
1.80V ±3%
3.33V ±3%
5.0V ±3%
2.52V ±3%
450kHz ±10%
2.4A
1.3A
1.4A
0.2A
<20mV
<20mV
<20mV
<10mV
dc1161bf
1

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Summary of Contents for Linear Technology DC1161B

  • Page 1 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear 250kHz to 2.5MHz using internal oscillator. At all frequen- Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    – – LOAD LOAD – – – – – – – – POWER SUPPLY LOAD – – LOAD – – DC1161B F01 Figure 1. DC1161B Proper Equipment Setup Figure 2. Measuring Input or Output Ripple dc1161bf...

  • Page 3: Sync Function

    DEMO MANUAL DC1161B SYNC FUNCTION EMI FILTER Install a 10k R20 resistor if the board is synchronized from Install EMI filters on the backside of the DC1161, however, an external signal generator. a trace cut is required for the insertion of the option circuit.
  • Page 4 DEMO MANUAL DC1161B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER / PART # Required Circuit Components CIN1, CIN2, CIN3 CAP ., X7R, 2.2μF , 50V, 10%, 1210 TDK, C3225X7R1H225K C1, C2, C9 CAP ., X7R, 0.22μF , 25V, 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. DC1161B...