NCV8668
http://onsemi.com
5
ELECTRICAL CHARACTERISTICS
V
in
= 13.2 V, C
in
= 0.1 mF, C
out
= 2.2 mF, for typical values T
J
= 25°C, for min/max values T
J
= −40°C to 150°C; unless otherwise noted.
(Notes 10 and 11)
Parameter UnitMaxTypMinSymbolTest Conditions
Disable and Quiescent Current
Disable Current
V
EN
= 0 V,T
J
< 85°C I
DIS
− − 1
mA
Quiescent Current (I
q
= I
in
– I
out
)
I
out
= 100 mA, T
J
= 25°C
I
out
= 100 mA, T
J
v 125°C
I
q
−
−
38
−
43
44
mA
Current Limit Protection
Current Limit
V
out
= 0.96 x V
out_nom
I
LIM
205 − 525 mA
Short Circuit Current Limit V
out
= 0 V I
SC
205 − 525 mA
Reverse Output Current Protection
Reverse Output Current Protection
V
EN
= 0 V, I
out
= −1 mA V
out_rev
− 2 5.5 V
PSRR
Power Supply Ripple Rejection (Note 13)
f = 100 Hz, 0.5V
pp
PSRR − 60 − dB
Enable Thresholds
Enable Input Threshold Voltage
Logic High
Logic Low
V
th(EN)
3
−
−
−
−
0.8
V
Enable Input Current
Logic High
Logic Low
V
EN
= 5 V
V
EN
= 0 V, T
J
< 85°C
I
EN_ON
I
EN_OFF
−
−
3
0.5
5
1
mA
Window Watchdog
Watchdog Mode Bit 1 Threshold Voltage
Voltage Increasing, Logic High
3.3 V
5.0 V
Voltage Decreasing, Logic Low
V
WM1,H
V
WM1,L
−
−
0.8
−
−
−
2.65
4.0
−
V
Watchdog Mode Bit 2 Threshold Voltage
Voltage Increasing, Logic High
3.3 V
5.0 V
Voltage Decreasing, Logic Low
V
WM2,H
V
WM2,L
−
−
0.8
−
−
−
2.65
4.0
−
V
Watchdog Input WDI Threshold Voltage
Voltage Increasing, Logic High
3.3 V
5.0 V
Voltage Decreasing, Logic Low
V
WDI,H
V
WDI,L
−
−
0.8
−
−
−
2.65
4.0
−
V
Watchdog Input WDI Current
Logic High
Logic Low
V
WDI,H
= 5 V
V
WDI,L
= 0 V, T
J
< 85 °C
I
WDI,H
I
WDI,L
−
−
3
0.5
4
1
mA
Watchdog Sampling Time Fast: WM2 = L
Slow: WM1 = L AND WM2 = H
t
sam
0.4
0.8
0.5
1.0
0.6
1.2
ms
Ignore Window Time Fast: WM2 = L
Slow: WM1 = L AND WM2 = H
t
IW
25.6
51.2
32.0
64.0
38.4
76.8
ms
Open Window Time Fast: WM2 = L
Slow: WM1 = L AND WM2 = H
t
OW
25.6
51.2
32.0
64.0
38.4
76.8
ms
Closed Window Time Fast: WM2 = L
Slow: WM1 = L AND WM2 = H
t
CW
25.6
51.2
32.0
64.0
38.4
76.8
ms
10.Refer to ABSOLUTE MAXIMUM RATINGS and APPLICATION INFORMATION for Safe Operating Area.
11. Performance guaranteed over the indicated operating temperature range by design and/or characterization tested at T
A
[T
J
. Low duty
cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.
12.Measured when output voltage falls 100 mV below the regulated voltage at V
in
= 13.2 V. If V
out
< 5 V, then V
DO
= V
in
– V
out
. Maximum dro-
pout voltage value is limited by minimum input voltage V
in
= 4.5 V recommended for guaranteed operation at maximum output current.
13.Values based on design and/or characterization.
14.Recommended for typical trigger time. T
WD
= t
CW
+ 1/2 * t
OW
