Linear Technology DC1729A Demo Manual
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Linear Technology DC1729A Demo Manual

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DESCRIPTION
Demonstration circuit 1729A is a 2.1A low dropout adjust-
able linear regulator featuring the
designed with multiple features and operates over a wide
1.4V to 40V input supply range. The LT3086 requires only
one resistor to set the output voltage from 0.4V to 32V
and it is stable with ceramic output capacitors requiring
a minimum of 10μF.
The key features of the LT3086 include programmable
cable drop compensation, master/slave configuration for
paralleling of multiple devices for higher load current and
heat spreading, output current and temperature monitor-
ing, and programmable power good flag.
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Output Voltage
OUT
I
Maximum Output Current
OUT
Note 1: The maximum output current 2.1A is when the internal current
limit is active and when V
-V
IN
OUT
output current under other conditions, please refer to the data sheet.
40V, 2.1A Low Dropout Adjustable
Linear Regulator with Monitoring
and Cable Drop Compensation
LT
3086. The device is
®
Specifications are at T
CONDITIONS
V
= 1V, I
OUT
Shunt at 1, 2 for JP1
Shunt at 3, 4 for JP1
Shunt at 5, 6 for JP1
Shunt at 7, 8 for JP1
Shunt at 9, 10 for JP1
Shunt at 11, 12 for JP1 and R10 Stuffed as 232k
(Note 1)
is smaller than 9V. For the maximum
DEMO MANUAL DC1729A
The LT3086 is offered in the packages of 16-lead DFN,
16-lead TSSOP, 7-lead DD-PAK, and a 7-lead TO-220.
The LT3086 data sheet gives a complete description of
the device, operation and application information. The data
sheet should be read in conjunction with this quick start
guide for working on or modifying the demo circuit 1729A.
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.
= 25°C
A
= 1mA
OUT1
LT3086
MIN
TYP
MAX
1.55
40
0.97
1
1.03
1.164
1.2
1.236
1.455
1.5
1.545
3.201
3.3
3.399
4.85
5
5.15
11.64
12
12.36
2.1
UNITS
V
V
V
V
V
V
V
A
dc1729af
1

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Summary of Contents for Linear Technology DC1729A

  • Page 1 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear paralleling of multiple devices for higher load current and Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    Note: Make sure that the power dissipation is limited 2. With power off, connect the input power supply to VIN below the thermal limit. and GND. Figure 1. DC1729A Proper Equipment Setup OR V Figure 2. Measuring Input or Output Ripple dc1729af...

  • Page 3: Thermal Image

    Figure 3. Temperature Rise at 2.2W Dissipation CABLE DROP COMPENSATION The power good setting jumper JP2 on the DC1729A is ages. For example, when JP1 is configured on 7 and 8 for used for setting the power good threshold for the cor- 3.3V...

  • Page 4: Parts List

    DEMO MANUAL DC1729A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP., X7R, 10µF 50V, 10%, 1210 MURATA, GRM32ER71H106KA12L CAP., X5R, 22µF 16V, 10%, 1206 AVX, 1206YD226KAT2A CAP., X7R, 10nF 25V, 10%, 0603 AVX, 06033C103KAT2A R1, R12 RES., CHIP, 100k, 1/16W, 1% 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.

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