Voltage Protection | NCP346

Overvoltage Protection Circuit

Obsolete

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Overview

The NCP346 overvoltage protection circuit (OVP) protects sensitive electronic circuitry from overvoltage transients and power supply faults when used in conjunction with an external P-channel FET. The device is designed to sense an overvoltage condition and quickly disconnect the input voltage supply from the load before any damage can occur. The OVP consists of a precise voltage reference, a comparator with hysteresis, control logic, and a MOSFET gate driver.

The OVP is designed on a robust BiCMOS process and is intended to withstand voltage transients up to 30 V. The device is optimized for applications that have an external AC/DC adapter or car accessory charger to power the product and/or recharge the internal batteries.

The nominal overvoltage threshold options are 4.45 or 5.5 V and can be adjusted upward with a resistor divider between the VCC, IN, and GND pins. It is suitable for single cell Li-Ion applications as well as 3/4 cell NiCD/NiMH applications.

  • Cellular Phones
  • Digital Cameras
  • Portable Computers and PDA's

  • Overvoltage Turn−Off Time of Less Than 1.0 µsec
  • Accurate Voltage Threshold of 4.45 V and 5.5 V (Nominal)
  • CNTRL Input Compatible with 1.8 V Logic Levels
  • Portable Audio and other Consumer Electronics
  • These are Pb-Free Devices

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VCC Min (V)

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Reference Price

NCP346SN1T1G

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Obsolete

CAD Model

Pb

A

H

P

TSOP-5 / SOT-23-5

483

1

260

REEL

3000

N

2.5

30

-

4.45

-

1200

-40

85

Price N/A

More Details

NCP346SN2T1G

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Obsolete

CAD Model

Pb

A

H

P

TSOP-5 / SOT-23-5

483

1

260

REEL

3000

N

2.5

30

-

5.5

-

1200

-40

85

Price N/A

More Details

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