NCP432, NCP433
http://onsemi.com
5
TYPICAL CHARACTERISTICS
160
140
120
100
80
60
40
20
0
01 432
V
IN
(V)
I
IN
(mA)
Temp = −40°C
Temp = 25°C
Temp = 85°C
Figure 4. Standby Current versus Temperature
1.2
01 432
V
IN
(V)
I
IN
(mA)
1.0
0.8
0.6
0.4
0.2
0
Temp = −40°C
Temp = 25°C
Temp = 85°C
Figure 5. Quiescent Current versus
Temperature
300
01 432
V
IN
(V)
R
DS(on)
(mW)
250
200
150
100
50
0
Figure 6. R
DS(on)
versus V
IN
, 255C, 100 mA
Load
I
LOAD
= 100 mA
350
01 432
V
IN
(V)
R
DS(on)
(mW)
300
250
200
150
100
50
0
−40°C
0°C
50°C
−25°C
25°C
85°C
I
LOAD
= 100 mA
Figure 7. R
DS(on)
versus Temperature, 100 mA
Load
FUNCTIONAL DESCRIPTION
Overview
The NCP432 – NCP433 are high side P channel MOSFET
power distribution switch designed to isolate ICs connected
on the battery in order to save energy. The part can be turned
on, with a range of battery from 1.0 V to 3.6 V.
Enable Input
Enable pin is an active high. The path is opened when EN
pin is tied low (disable), forcing P MOS switch off.
The IN/OUT path is activated with a minimum of Vin of
1.0 V and EN forced to high level.
Auto Discharge (NCP433 only)
NMOS FET is placed between the output pin and GND,
in order to discharge the application capacitor connected on
OUT pin.
The auto−discharge is activated when EN pin is set to low
level (disable state).
The discharge path ( Pull down NMOS) stays activated as
long as EN pin is set at low level and V
IN
> 1.0 V.
In order to limit the current across the internal discharge
N−MOSFET, the typical value is set at 65 W.
Cin and Cout Capacitors
IN and OUT, 1 mF, at least, capacitors must be placed as
close as possible the part for stability improvement.
