NCP1421 View Datasheet(PDF) - ON Semiconductor
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NCP1421 Datasheet PDF : 14 Pages
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NCP1421
TYPICAL OPERATING CHARACTERISTICS
10
10
5
5
VIN = 2.5 V
0
VOUT = 3.3 V
L = 5.6 mH
−5 CIN = 22 mF
COUT = 22 mF
TA = 25_C
−10
10
100
VIN = 2.0 V
1000
OUTPUT LOADING CURRENT, ILOAD/mA
Figure 14. Output Voltage Change vs. Load
Current
50
VIN = 2.5 V
40
VOUT = 3.3 V
L = 6.8 mH
CIN = 22 mF
30
COUT = 22 mF
TA = 25_C
20
500 mA
300 mA
10
100 mA
0
1.5
1.7
1.9
2.1
2.3
2.5
BATTERY INPUT VOLTAGE, VBATT/V
Figure 16. Battery Input Voltage vs. Output Ripple
Voltage
15
0
−5
−10
10
VOUT = 5.0 V
L = 5.6 mH
CIN = 22 mF
COUT = 22 mF
TA = 25_C
VIN = 3.3 V
VIN = 1.5 V
VIN = 2.5 V
100
1000
OUTPUT LOADING CURRENT, ILOAD/mA
Figure 15. Output Voltage Change vs. Load
Current
Upper Trace: Voltage at LBI Pin, 1.0 V/Division
Lower Trace: Voltage at LBO Pin, 1.0 V/Division
Figure 17. Low Battery Detect
12.5
10
7.5
5.0
2.5
1.5
2.0 2.5 3.0 3.5
4.0 4.5 5.0
INPUT VOLTAGE AT OUT PIN, VOUT/V
Figure 18. No Load Operating Current vs. Input
Voltage at OUT Pin
VIN = 2.5 V
VOUT = 5.0 V
ILOAD = 10 mA
Upper Trace: Input Voltage Waveform, 1.0 V/Division
Lower Trace: Output Voltage Waveform, 2.0 V/Division
Figure 19. Startup Transient Response
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