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NCP349

Positive Overvoltage Protection Controller with Internal Low RON NMOS FET

ON Semiconductor 

NCP349

Positive Overvoltage

Protection Controller with

Internal Low RON NMOS FET

The NCP349 is able to disconnect the systems from its output pin

when wrong input operating conditions are detected. The system is

positive overvoltage protected up to +28 V.

This device uses an internal NMOS and therefore, no external

device is necessary, 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 mW), if the

input voltage exceeds the overvoltage threshold (OVLO) or falls

below the undervoltage threshold (UVLO).

At powerup (EN pin = low level), the Vout turns on ton time after

the Vin exceeds the undervoltage threshold.

The NCP349 provides a negative going flag (FLAG) 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 mF or larger capacitor.

Features

• Overvoltage Protection up to 28 V

• On−Chip Low RDS(on) NMOS Transistor: 65 mW

• Internal Charge Pump

• Overvoltage Lockout (OVLO)

• Undervoltage Lockout (UVLO)

• Soft−Start

• Alert FLAG Output

• Shutdown EN Input

• Compliance to IEC61000−4−2 (Level 4)

8.0 kV (Contact)

15 kV (Air)

• ESD Ratings: Machine Model = B

Human Body Model = 2

• DFN6 1.6x2 mm Package

• This is a Pb−Free Device

Applications

• Cell Phones

• Camera Phones

• Digital Still Cameras

• Personal Digital Applications

• MP3 Players

http://onsemi.com

6

1

DFN6

MN SUFFIX

CASE 506BM

MARKING DIAGRAM

1

XX MG

G

XX = Specific Device Code

M = Date Code

G = Pb−Free Package

PIN CONNECTIONS

IN 1

GND 2

FLAG 3

PAD1

IN

6 EN

5 OUT

4 OUT

(Top View)

ORDERING INFORMATION

See detailed ordering, marking and shipping information in the

package dimensions section on page 11 of this data sheet.

© Semiconductor Components Industries, LLC, 2012

1

September, 2012 − Rev. 3

Q

Publication Order Number:

NCP349/D

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