NCP349-DPositiveOvervoltageProtectionCircuit-综合文档资源-CSDN文库

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September, 2012 − Rev. 3

1 Publication Order Number:

NCP349/D

NCP349

Positive Overvoltage

Protection Controller with

Internal Low R

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 R

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 V

out

turns on t

time after

the V

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 R

DS(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

DFN6

MN SUFFIX

CASE 506BM

PIN CONNECTIONS

http://onsemi.com

MARKING DIAGRAM

XX = Specific Device Code

M = Date Code

G = Pb−Free Package

(Top View)

FLAG OUT

GND OUT

IN EN

PAD1

ORDERING INFORMATION

See detailed ordering, marking and shipping information in the

package dimensions section on page 11 of this data sheet.

XX MG

NCP349

http://onsemi.com

PIN FUNCTION DESCRIPTION

Pin No. Symbol Function Description

1, 7 IN INPUT Input Voltage Pins. These pins are connected to the Wall Adapoter (AC−DC, Vbus ..). A 1 mF low

ESR ceramic capacitor, or larger, must be connected between these pins and GND, as close as

possible to the DUT. The two IN pins must be connected together to power supply. (See PCB

recommendation for the pin7).

2 GND POWER Ground

3 FLAG OUTPUT Fault Indication Pin. This pin allows an external system to detect a fault on the IN pins. The FLAG pin

goes low when input voltage exceeds OVLO threshold or drops below UVLO threshold. Since the

FLAG pin is open drain functionality, an external pull−up resistor to V

must be added. (Minimum

10 kW).

4, 5 OUT OUTPUT Output Voltage Pins. These pins follow IN pins when “no fault” is detected. The two OUT pins must

be hardwired together.

6 EN INPUT Enable Pin. The device enters in shutdown mode when this pin is tied to a high level. In this case the

output is disconnected from the input. To allow normal functionality, the EN pin shall be connected to

GND to a pull down or to a I/O pin. This pin does not have an impact on the fault detection.

MAXIMUM RATINGS

Rating Symbol Value Unit

Minimum Voltage (IN to GND) Vmin

−0.3 V

Minimum Voltage (All others to GND) Vmin −0.3 V

Maximum Voltage (IN to GND) Vmax

30 V

Maximum Voltage (All others to GND) Vmax 7.0 V

Maximum Current (UVLO<V

<OVLO) Imax 2.0 A

Maximum Peak Current (t ≤ 1 ms, T

= 85°C) Imax

peak

4.0 A

Thermal Resistance, Junction−to−Air (Note 1) R

180 °C/W

Operating Ambient Temperature Range T

−40 to +85 °C

Storage Temperature Range T

stg

−65 to +150 °C

Junction Operating Temperature T

150 °C

ESD Withstand Voltage (IEC 61000−4−2) (input only) when bypassed with 1.0 mF capacitor

Human Body Model (HBM), Model = 2 (Note 2)

Machine Model (MM) Model = B (Note 3)

Vesd 15 Air, 8.0 Contact

2000

200

Moisture Sensitivity MSL Level 1 −

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

1. The R

is highly dependent on the PCB heat sink area (connected to pin 7).

2. Human Body Model, 100 pF discharged through a 1.5 kW resistor following specification JESD22/A114.

3. Machine Model, 200 pF discharged through all pins following specification JESD22/A115.

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