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NCP347
(Rev.:2007)

Positive Overvoltage Protection Controller with Internal Low RON NMOS FET and Status FLAG

ON Semiconductor 

NCP347

ELECTRICAL CHARACTERISTICS (Min/Max limits values (-40°C < TA < +85°C) and Vin = +5.0 V. Typical values are TA = +25°C,

unless otherwise noted.)

Characteristic

Symbol

Conditions

Min

Typ Max Unit

Input Voltage Range

Undervoltage Lockout Threshold (Note 4)

Vin

UVLO

-

Vin falls down UVLO threshold

from 5 V to 2.7 V

1.2

-

28

V

2.8

2.95 3.1

V

Undervoltage Lockout Hysteresis

UVLOhyst

Overvoltage Lockout Threshold (Note 4)

NCP347MTAE

NCP347MTAF

NCP347MTAH

OVLO

Vin rises up UVLO + UVLOhyst

Vin rises up OVLO threshold

30

60

90

mV

V

5.39 5.63 5.88

5.63 5.90 6.17

6.80 7.20 7.60

Overvoltage Lockout Hysteresis

OVLOhyst Vin falls down OVLO + OVLOhyst

NCP347MTAE

30

NCP347MTAF

30

NCP347MTAH

50

mV

60

90

60

90

70

100

Vin versus Vout Resistance

Supply Quiescent Current

RDS(on)

Idd

Vin = 5.0 V, EN = GND,

Load connected to Vout

No load. EN = 5.0 V

No load. EN = Gnd

-

65

110 mW

-

90

150

mA

-

170

250

mA

UVLO Supply Current

FLAG Output Low Voltage

Idduvlo

Volflag

VIN = 2.7 V

1.2 V < VIN < UVLO

Sink 50 mA on/FLAG pin

-

60

-

mA

-

20

400 mV

VIN > OVLO

Sink 1.0 mA on FLAG pin

-

-

400 mV

FLAG Leakage Current

EN Voltage High

FLAGleak

Vih

FLAG level = 5.0 V

-

-

1.0

-

nA

1.2

-

-

V

EN Voltage Low

Vol

-

-

-

0.4

V

EN Leakage Current

TIMINGS

Startup Delay

ENleak

EN = 5.0 V or GND

-

1.0

-

nA

ton

From Vin > UVLO to Vout = 0.3 V

30

50

70

ms

(See Figures 3 & 7)

FLAG Going Up Delay

tstart

From Vout = 0.3 V to FLAG =

1.2 V (See Figures 3 & 9)

30

50

70

ms

Output Turn Off Time

toff

From Vin > OVLO to Vout < =

-

1.5

5.0

ms

0.3 V (See Figures 4 & 8)

Vin increasing from 5.0 V to 8.0 V

at 3.0 V/ms

Rload connected on Vout

Alert Delay

tstop

From Vin > OVLO to FLAG < =

0.4 V (See Figures 4 & 10)

-

1.0

-

ms

Vin increasing from 5.0 V to 8.0 V

at 3.0 V/ms

Rload connected on Vout

Disable Time

tdis

From EN > = 1.2 V to

-

1.0

5.0

ms

Vout < 0.3 V

Rload = 5.0 W

(See Figures 5 & 12)

NOTE: Electrical parameters are guaranteed by correlation across the full range of temperature.

4. Additional UVLO and OVLO thresholds ranging from UVLO and from OVLO can be manufactured. Contact your ON Semiconductor

representative for availability.

http://onsemi.com

4

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