Linear Technology LT3091EDE Demo Manual
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Linear Technology LT3091EDE Demo Manual

–36v, 1.5a negative linear regulator with programmable current limit
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Description
Demonstration circuit DC2276A is a 1.5A low dropout
negative linear regulator featuring the
is designed for applications requiring negative output volt-
age, high current without a heat sink, output adjustability
to zero and low dropout voltage.
The LT3091 features fast transient response, high PSRR
and output noise as low as 18µV
a wide output voltage range (0V to –32V) while maintain-
ing unity gain operation. This yields virtually constant
bandwidth, load regulation, PSRR and noise, independent
of the programmed output voltage.
The LT3091 supplies 1.5A at a typical dropout voltage of
300mV. Operating quiescent current is nominally 1.2mA
and drops to <<1µA in shutdown. A single resistor adjusts
the LT3091's precision programmable current limit. The
LT3091's positive or negative current monitor either
BoarD photo
–36V, 1.5A Negative Linear Regulator
with Programmable Current Limit
LT
3091. This device
®
. The LT3091 generates
RMS
DEMO MANUAL DC2276A
sources a current (0.25mA/A) or sinks a current (0.5mA/A)
proportional to output current.
Built-in protection includes reverse output protection,
internal current limit with foldback and thermal shutdown
with hysteresis.
DC2276A uses the LT3091EDE which is a 14-lead (4mm
x 3mm) plastic DFN package with an exposed pad on the
bottom side of the IC for better thermal performance.
These features make DC2276A an ideal circuit for surface-
mount power supplies, rugged industrial power supplies,
low output voltage supplies and as a post regulator for
switching supplies.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2276A
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.
LT3091EDE
dc2276af
1

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Summary of Contents for Linear Technology LT3091EDE

  • Page 1 LT3091’s precision programmable current limit. The L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear LT3091’s positive or negative current monitor either Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Performance Summary

    DEMO MANUAL DC2276A performance summary Specifications are at T = 25°C CONDITIONS MIN* Shunt at –1.25V for JP1 –10mA –36.0 –1.55 –1.30 –1.25 –1.20 –1.5A –2.75 –1.55 –1.30 –1.25 –1.20 Shunt at –2.5V for JP1 –10mA –36.0 –2.80 –2.6 –2.5 –2.4 –1.5A –4.0...

  • Page 3: Quick Start Procedure

    DEMO MANUAL DC2276A Quick start proceDure DC2276A is easy to set up to evaluate the performance 4. Turn on the power at the V of the LT3091. Refer to Figure 1 for proper measurement NOTE: Make sure that the V voltage does not exceed equipment setup and follow the procedure below: –36V.
  • Page 4 DEMO MANUAL DC2276A positive or negative current monitor anD caBle Drop compensation configuration There are both positive and negative current monitors on Demo Circuit 2276A also can be configured to evaluate the the LT3091. The configurations for these two monitors are cable drop compensation on the LT3091.

  • Page 5: Thermal Image

    DEMO MANUAL DC2276A thermal image An example thermal image shows the temperature the LT3091 IC. This gives an IC case-to-ambient thermal resistance of θ distribution on the PC board. The test is done in still air = 22°C/W on the demo circuit. The IC, at room temperature with 2.25W power dissipation in at its highest point, reaches 75°C, at –2.75V , –1.25V...

  • Page 6: Parts List

    VISHAY, CRCW06031K58FKEA RES., CHIP, 806, 1/10W, 1%, 0603 VISHAY, CRCW0603806RFKEA RES., CHIP, 0, 1/10W, 0603 VISHAY, CRCW06030000Z0EA I.C., REGULATOR, DFN14 LINEAR TECH, LT3091EDE#PBF Additional Demo Board Circuit Components C5 (OPT) CAP., OPTION, 1206 R8, R12, R13 (OPT) RES., OPTION, 0603...

  • 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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