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DESCRIPTION
Demonstration circuit DC1506A features the LTC
an overvoltage/overcurrent protection controller that
safeguards 2.5V to 5.5V systems from input supply over-
voltage. The LTC4361 is designed for portable devices with
multiple power supply options including wall adapters, car
battery adapters and USB ports.
The LTC4361 controls an external N-channel MOSFET in
series with the input power supply. During overvoltage
transients, the LTC4361 turns off the MOSFET within 1µs,
isolating downstream components from the input supply.
Inductive cable transients are absorbed by the MOSFET
and load capacitance. In most applications, the LTC4361
provides protection from transients up to 80V without
requiring transient voltage suppressors or other external
components.
The LTC4361 has a delayed start-up and adjustable
dV/dt ramp-up for inrush current limiting. A PWRGD pin
provides power good monitoring for V
DEMO MANUAL DC1506A
4361
features a soft shutdown controlled by the ON pin and
®
drives an optional external P-channel MOSFET for negative
voltage protection. Following an overvoltage condition,
the LTC4361 automatically restarts with a start-up delay.
After an overcurrent fault, the LTC4361-1 remains off
while the LTC4361-2 automatically restarts after a 130ms
start-up delay.
DC1506A demonstrates three protection schemes selected
with a jumper: (A) overvoltage and overcurrent protec-
tion, (B) overvoltage, overcurrent, and negative voltage
protection, and (C) overvoltage, overcurrent, negative
voltage, and reverse current protection. Each option has
ON control, an output LED and can be applied to a USB
protected output.
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
. The LTC4361
Technology Corporation. All other trademarks are the property of their respective owners.
IN
Figure 1. Demonstration Circuit 1506A
LTC4361 Overvoltage/
Overcurrent Protection
1506a FO1
Controller
dc1506af
1
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Summary of Contents for Linear Technology LTC4361
- Page 1 The LTC4361 has a delayed start-up and adjustable http://www.linear.com/demo dV/dt ramp-up for inrush current limiting. A PWRGD pin L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear provides power good monitoring for V . The LTC4361 Technology Corporation.
-
Page 2: Performance Summary
QUICK START PROCEDURE Demonstration circuit description 1506A is easy to set protection select (B) OV/OC/NV and connect to up to evaluate the performance of the LTC4361. Refer to OUT(B). Figure 2b. Figure 2 and Figure 3 for proper measurement equipment c. - Page 3 DEMO MANUAL DC1506A QUICK START PROCEDURE SELECT PROTECTION OVERVOLTAGE, OVERCURRENT PROTECTED PWRGD LOAD – SELECT ENABLE 1506a FO2a Figure 2a. DC1506A Protection (A) Setup for Overvoltage and Overcurrent dc1506af...
- Page 4 DEMO MANUAL DC1506A QUICK START PROCEDURE SELECT PROTECTION OVERVOLTAGE, OVERCURRENT, NEGATIVE VOLTAGE PROTECTED OUT – PWRGD LOAD SELECT ENABLE 1506a FO2b Figure 2b. DC1506A Protection (B) Setup for Overvoltage, Overcurrent and Negative Voltage SELECT PROTECTION OVERVOLTAGE, OVERCURRENT, NEGATIVE VOLTAGE, REVERSE CURRENT PROTECTED OUT –...
- Page 5 DEMO MANUAL DC1506A QUICK START PROCEDURE PLUG USB CABLE USB CABLE USB DEVICE SELECT SELECT USB PROTECTION PROTECTION (JP3 MUST MATCH JP1) SELECT ENABLE 1506a FO3 Figure 3. DC1506A USB Protection Setup dc1506af...
- Page 6 In the case of an overcurrent, the The DC1506A is used to evaluate the LTC4361 in three LTC4361-2 used in protection (B) automatically retries to protection configurations selected at JP1. The device in turn the MOSFET back on.
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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 representation 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.
- Page 9 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC1506A...
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