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DESCRIPTION
Demonstration circuit 1728A is an adjustable 1.5A negative
linear regulator featuring the LT3015. This device supplies
up to 1.5A of output current at a typical dropout voltage
of 300mV. Operating quiescent current is typically 1.1mA
and drops to < 1μA in shutdown. Quiescent current is also
well controlled in dropout. In addition to fast transient
response, the LT3015 exhibits very low output noise,
making it ideal for noise-sensitive applications.
A key feature of the LT3015 is the capability to supply a
wide output voltage range. The DC1728A can be set to
–1.22V, –2.5V, –5.0V, –12.0V, –15.0V, as well as a user
select option. In addition, the DC1728A is capable of de-
livering up to –1.5A output current, and can be used as a
high current negative linear regulator, post regulator for
switching supply, variable voltage supply or low output
voltage power supply.
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Output Voltage
OUT
V
Output Voltage
OUT
V
Output Voltage
OUT
V
Output Voltage
OUT
V
Output Voltage
OUT
1.5A, Low Noise, Negative Linear Regulator
(T
= 25°C)
A
CONDITIONS
V
OUT
Shunt at 1, 2 for JP2
Shunt at 3, 4 for JP2
Shunt at 5, 6 for JP2
Shunt at 7, 8 for JP2
Shunt at 9, 10 for JP2
DEMONSTRATION CIRCUIT
1728A QUICK START GUIDE
with Precision Current Limit
Internal protection circuitry includes reverse output pro-
tection, precision current limit with foldback and thermal
limit with hysteresis.
The LT3015 is available as an adjustable device with a
–1.22V reference voltage. Packages include the 5-lead
TO-220 and DD-Pak, a thermally enhanced 12-lead MSOP
and the low profile 8-lead 0.75mm × 3mm × 3mm DFN.
The LT3015 datasheet 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 1728A.
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.
= –1.22V, I
= –1mA
OUT1
LT3015
MIN
TYP
MAX
UNITS
–1.8
–30
–1.183
–1.22
–1.257
–2.425
–2.5
–2.575
–4.85
–5.0
–5.15
–11.64
–12.0
–12.36
–14.55
–15.0
–15.45
V
V
V
V
V
V
dc1728af
1
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Table of Contents
Related Manuals for Linear Technology LT3015
Summary of Contents for Linear Technology LT3015
- Page 1 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.
- Page 2 Demonstration circuit 1728A is easy to set up to evalu- 3. With power off, connect the input power supply to V ate the performance of the LT3015. Refer to Figure 1 for and GND. proper measurement equipment setup and follow the 4.
- Page 3 Thermal Image An example thermal image (Figure 3) shows the temperature distribution on the board. The test is done in still air at room temperature with 1.96W power dissipation in the LT3015. This gives the IC case-to-ambient thermal resistance θ...
-
Page 4: Parts List
DEMONSTRATION CIRCUIT 1728A QUICK START GUIDE PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP ., X7R, 10μF 50V, 10%, 1210 MURATA, GRM32ER71H106K CAP ., X7R, 10μF 25V, 10%, 1206 MURATA, GRM31CR71E106KA12L RES., CHIP, 3.48k, 1/16W, 1% 0402 VISHAY, CRCW04023K48FKED R2, RSD RES., CHIP , 0Ω, 0402... - Page 5 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. DC1728A...
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