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NCP391

Positive Overvoltage Protection Controller with Internal Low RON NMOS FET

ON Semiconductor 

NCP391

ELECTRICAL CHARACTERISTICS − NCP391FCCADT2G (Min/Max limits values (−40°C < TA < +85°C) and Vin = +4.2 V. Typical

values are TA = +25°C, unless otherwise noted.)

Characteristic

Symbol

Conditions

Min

Typ Max Unit

Input Voltage Range

Undervoltage Lockout Threshold (Note 5)

Vin

UVLO

−

Vin falls below UVLO threshold

from 4.2 V to 2.7 V

1.2

−

28

V

V

2.8

2.95 3.1

Undervoltage Lockout Hysteresis

Overvoltage Lockout Threshold (Note 5)

UVLOhyst Vin rises above UVLO + UVLOhyst

30

60

90

mV

OVLO

Vin rises above OVLO threshold

V

4.8

4.95 5.1

Overvoltage Lockout Hysteresis

OVLOhyst Vin falls below OVLO + OVLOhyst

mV

50

100 150

Vin versus Vout Resistance

Supply Quiescent Current

RDS(on)

Idd

Vin = 4.2 V, EN = GND,

Load connected to Vout

No load. EN = 4.2 V

No load. EN = Gnd

−

120 200 mW

−

70

150

mA

−

90

170

mA

UVLO Supply Current

MOSFET Leakage

FLAG Output Low Voltage

Idduvlo

Ivdss

Volflag

VIN = 2.7 V

VIN = 28 V

1.2 V < VIN < UVLO

Sink 50 mA on/FLAG pin

−

60

−

mA

−

10

500

nA

−

20

400 mV

VIN > OVLO

Sink 1.0 mA on FLAG pin

−

−

400 mV

FLAG Leakage Current

EN Voltage High

FLAGleak

Vih

FLAG level = 4.2 V

−

−

1.0

−

nA

1.2

−

4.95

V

EN Voltage Low

Vol

−

−

−

0.4

V

EN Leakage Current

Thermal Shutdown Temperature

Thermal Shutdown Hysteresis

TIMINGS

Startup Delay

ENleak

tSD

tSDhyst

EN = 4.2 V or GND

−

−

−

1.0

−

nA

−

150

−

°C

−

15

−

°C

ton

From Vin > UVLO to Vout = 0.3 V

6.0

10

14

ms

(See Figures 3 & 7)

FLAG Going Up Delay

tstart

From Vout = 0.3 V to FLAG = 1.2 V

6.0

10

14

ms

(See Figures 3 & 9)

Output Turn Off Time

toff

From Vin > OVLO to Vout < = 0.3 V

−

1.5

5.0

ms

(See Figures 4 & 8)

Vin increasing from 4.2 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 4.2 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.

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

representative for availability.

http://onsemi.com

5

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