Voltage Protection | NCP349

Positive Overvoltage Protection Circuit with Internal Low Ron NMOS FET

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概览

The NCP349 is able to disconnect the systems from its output pin in case wrong input operating conditions are detected. The system is positive overvoltage protected up to +28 V.
Due to this device using internal NMOS, no external device is necesary, reducing the system cost and the PCB area of the application board.
The NCP349 is able to instantaneously disconnect the output from the input, due to integrated Low Ron Power NMOS (65 mΩ, if the input voltage exceeds the overvoltage threshold (OVLO) or undervoltage threshold(UVLO).
At powerup (EN(BAR) pin = low level), the Vout turns on ton after the Vin exceeds the undervoltage threshold.
The NCP349 provides a negative going flag(FLAG(BAR)) output, which alerts the system that a fault has occurred.
In addition, the device has ESD-protected input (15 kV Air) when bypassed with a 1.0 µF or larger capacitor.

  • Cell Phones, Camera Phones, Digital Still Cameras, PDA, and MP3 Players
  • Overvoltage Protection up to 28 V
  • On-Chip Low RDS(on) NMOS Transistor: 65 m
  • Overvoltage Lockout (OVLO)
  • Undervoltage Lockout (UVLO)
  • Internal Soft start
  • Alert FLAG(BAR) Output
  • Shutdown EN(BAR) Input
  • Compliance to IEC61000-4-2 (Level 4), 8.0 kV (Contact), and 15 kV (Air)
  • ESD Ratings: Machine Model = B, Human Body Model = 3
  • This is a Pb-Free Device
  • Package DFN 1.6 x 2.0 mm

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Pricing ($/Unit)

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NCP349MNTBG

Lifetime

Pb

A

H

P

DFN-6

506BM

1

260

REEL

3000

N

1.2

28

0.065

6.85

2.95

0.25

-40

85

$0.2933

More Details

NCP349MNBGTBG

Lifetime

Pb

A

H

P

DFN-6

506BM

1

260

REEL

3000

N

1.2

28

0.065

6.02

3.25

0.25

-40

85

$0.3116

More Details

NCP349MNBKTBG

Lifetime

Pb

A

H

P

DFN-6

506BM

1

260

REEL

3000

N

1.2

28

0.065

6.4

3.25

0.25

-40

85

$0.2933

More Details

NCP349MNAETBG

Lifetime

Pb

A

H

P

DFN-6

506BM

1

260

REEL

3000

N

1.2

28

0.065

5.68

2.95

0.25

-40

85

$0.3227

More Details

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