Datasheet

NCP1421
http://onsemi.com
5
TYPICAL OPERATING CHARACTERISTICS
1.180
1.185
1.190
1.195
1.200
1.205
0.0
0.1
0.2
0.3
0.4
0.5
0.6
−40 −20 0 20 40 60 80 100
AMBIENT TEMPERATURE, T
A
/°C
SWITCH ON RESISTANCE, R
DS(ON)
/
P−FET (M2)
N−FET (M1)
V
OUT
= 3.3 V
−40 −20
0 20 40 60 80 100
AMBIENT TEMPERATURE, T
A
/°C
REFERENCE VOLTAGE, V
REF
/V
0.5
0.6
0.7
0.8
0.9
1.0
−40 −20
0 20 40 60 80 100
0.6
0.9
1.1
1.4
1.6
0 50 100 150 200 25
0
T
A
= 25°C
OUTPUT LOADING CURRENT, I
LOAD
/mA
MINIMUM STARTUP BATTERY
VOLTAGE, V
BATT
/V
Figure 2. Reference Voltage vs. Output Current
Figure 3. Reference Voltage vs. Voltage at OUT Pin
Figure 4. Reference Voltage vs. Temperature Figure 5. Switch ON Resistance vs. Temperature
Figure 6. L
X
Switch Max. ON Time vs. Temperature Figure 7. Minimum Startup Battery Voltage vs.
Loading Current
1.180
1.190
1.200
1.210
1.220
1 10 100 1000
V
OUT
= 3.3 V
L = 10 H
C
IN
= 22 F
C
OUT
= 22 F
C
REF
= 1.0 F
T
A
= 25C
AMBIENT TEMPERATURE, T
A
/°C
L
X
SWITCH MAXIMUM, ON TIME, t
ON
/S
OUTPUT CURRENT, I
LOAD
/mA
REFERENCE VOLTAGE, V
REF
/V
V
IN
= 1.5 V
V
IN
= 2.0 V
V
IN
= 2.5 V
1.180
1.190
1.210
1.220
C
REF
= 200 nF
I
REF
= 0 mA
T
A
= 25°C
VOLTAGE AT OUT PIN, V
OUT
/V
REFERENCE VOLTAGE, V
REF
/V
V
OUT
= 3.3 V
C
REF
= 200 nF
I
REF
= 0 mA
1.5 2 2.5 3 3.5 4 4.5 5
1.200