Datasheet

NCP1421
http://onsemi.com
7
TYPICAL OPERATING CHARACTERISTICS
−10
−5
5
10
10 100 1000
V
OUT
= 3.3 V
L = 5.6 H
C
IN
= 22 F
C
OUT
= 22 F
T
A
= 25C
0
10
20
30
40
50
1.5 1.7 1.9 2.1 2.3 2.5
Figure 14. Output Voltage Change vs. Load
Current
Figure 15. Output Voltage Change vs. Load
Current
Figure 16. Battery Input Voltage vs. Output Ripple
Voltage
Figure 17. Low Battery Detect
Figure 18. No Load Operating Current vs. Input
Voltage at OUT Pin
V
IN
= 2.5 V
V
IN
= 2.0 V
0
OUTPUT LOADING CURRENT, I
LOAD
/mA
OUTPUT VOLTAGE CHANGE/%
−10
−5
5
10
10 100 1000
V
OUT
= 5.0 V
L = 5.6 H
C
IN
= 22 F
C
OUT
= 22 F
T
A
= 25C
V
IN
= 3.3 V
V
IN
= 1.5 V
0
OUTPUT LOADING CURRENT, I
LOAD
/mA
OUTPUT VOLTAGE CHANGE/%
V
IN
= 2.5 V
300 mA
BATTERY INPUT VOLTAGE, V
BATT
/V
RIPPLE VOLTAGE, V
RIPPLE
/mV
p−p
100 mA
500 mA
V
IN
= 2.5 V
V
OUT
= 3.3 V
L = 6.8 H
C
IN
= 22 F
C
OUT
= 22 F
T
A
= 25C
Upper Trace: Input Voltage Waveform, 1.0 V/Division
Lower Trace: Output Voltage Waveform, 2.0 V/Division
Figure 19. Startup Transient Response
2.5
5.0
7.5
10
12.5
15
1.5 2.0 2.5 3.0 3.5 5.0
INPUT VOLTAGE AT OUT PIN, V
OUT
/V
NO LOAD OPERATING CURRENT, I
BATT
/A
4.0 4.5
Upper Trace: Voltage at LBI Pin, 1.0 V/Division
Lower Trace: Voltage at LBO Pin, 1.0 V/Division
V
IN
= 2.5 V
V
OUT
= 5.0 V
I
LOAD
= 10 mA