DC1575A Linear Technology, DC1575A Datasheet

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DC1575A

Manufacturer Part Number
DC1575A
Description
LTC4362-1/LTC4362-2 Overvoltage/Overcurrent Protector With LatchOff/Auto-Retry
Manufacturer
Linear Technology
Series
-r
Datasheets

Specifications of DC1575A

Design Resources
DC1575A Schematic DC1575 Design Files
Main Purpose
Overvoltage/Overcurrent Protection
Embedded
No
Utilized Ic / Part
LTC4362-2
Primary Attributes
-
Secondary Attributes
-
Kit Application Type
Power Management
Application Sub Type
Overvoltage Protection
Features
Demonstrates Two Protection Schemes Selected At JP2, Provides Connection For USB Protection
Lead Free Status / Rohs Status
Not applicable / Not applicable
DESCRIPTION
Demonstration circuit DC1575A features the LTC
a monolithic overvoltage/overcurrent protector that safe-
guards 2.5V to 5.5V systems from power supply over-
voltage. It is designed for portable devices with multiple
power supply options including wall adaptors, car battery
adaptors and USB ports.
The LTC4362 controls an internal 40mΩ N-channel MOSFET
in series with the input power supply. During overvoltage
transients, the LTC4362 turns off the MOSFET within 1μs,
isolating downstream components from the input supply.
In most applications, the LTC4362 rides through induc-
tive cable transients without requiring transient voltage
suppressors or other external components. An internal
current sense resistor is used to implement overcurrent
protection.
The LTC4362 has a delayed start-up at plug-in and con-
trolled dV/dt ramp-up for inrush current limiting. A PWRGD
pin provides power good monitoring for V
PERFORMANCE SUMMARY
PARAMETER
Input Voltage
Output Voltage
Overcurrent Threshold
Overcurrent Retry
JP2: OV/OC
JP2: OV/OC/NV
Input Range for Gate Turn-On
Internal Sense Resistor
LTC4362-2
CONDITION
IN
. The LTC4362
(T
A
®
= 25°C)
4362,
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 LTC4362 automatically restarts with a 130ms delay.
After an overcurrent fault, the LTC4362-1 remains off while
the LTC4362-2 (featured on the DC1575A) automatically
restarts after a 130ms delay.
DC1575A demonstrates two protection schemes selected
with a jumper. The fi rst selection is overvoltage and
overcurrent protection. The second selection is overvolt-
age, overcurrent, and negative voltage protection. Also
on the DC1575A is ON control with another jumper, input
LEDs indicating positive or negative input voltage, output
LED and connection for USB protected output.
Design fi les 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.
DEMO MANUAL DC1575A
Monolithic Overvoltage/
Overcurrent Protector
0V to 28V
–30V to 28V
2.1V to 5.8V
1.5A
Auto-Retry
VALUE
LTC4362-2:
dc1575af
1

Related parts for DC1575A

DC1575A Summary of contents

Page 1

... The fi rst selection is overvoltage and overcurrent protection. The second selection is overvolt- age, overcurrent, and negative voltage protection. Also on the DC1575A is ON control with another jumper, input LEDs indicating positive or negative input voltage, output LED and connection for USB protected output. ...

Page 2

... Connect a power supply across V 5) For USB protection, connect a USB cable from J2 to the USB device (Figure 2). Select the protection type at JP2. Connect a second USB cable from a computer to J1. Figure 1. DC1575A Basic Setup Figure 2. DC1506A USB Protection Setup and GND. IN PROTECTED ...

Page 3

... LTC4362 to protect the output against an inadvertent negative voltage connection at the input. An internal current sense resistor provides overcurrent detection. In the case of an overcurrent, the LTC4362-2 used in the DC1575A automatically retries to turn the internal MOSFET back on. The amber V LED indicates if the input supply is on while ...

Page 4

... DEMO MANUAL DC1575A PARTS LIST ITEM QUANTITY REFERENCE 1 2 CLD1, CLD2 E1, E2, E3, E4, E5 JP1, JP2 XJP1, XJP2 DESCRIPTION Current Limiting Diode, 3.2V SOD-80 Capacitor, X5R 10μF 10V 20% 0603 LED, Green LED, Amber LED, Red LN1251-C-TR Zener Diode, 5.6V SOD-523 Turret, Testpoint 0.094" ...

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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. DEMO MANUAL DC1575A dc1575af 5 ...

Page 6

... DEMO MANUAL DC1575A 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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