Datasheet

ADP1621 Data Sheet
Rev. B | Page 10 of 32
250
0
–40 160
CS LEAKAGE (nA)
TEMPERATURE (°C)
V
IN
= 5V
CS = 30V
200
150
100
50
10 60 110
06090-016
Figure 17. Temperature vs. CS Leakage
8
–16
–50 150
TEMPERATURE (°C)
FB BIAS CURRENT (nA)
4
0
–4
–8
–12
0 50 100
V
FB
= 1.2113V AT 25°C
FB BIAS CURRENT IS MEASURED
BY FORCING A CONSTANT 1.2113V
OVER THE TEMPERATURE RANGE.
06090-017
Figure 18. FB Bias Current vs. Temperature
90
0
1.0
f
SYNC
/ f
OSC
PEAK SLOPE COMPENSATION CURRENT (µA)
2.2
f
OSC
= 200kHz
f
OSC
= 550kHz
80
70
60
50
40
30
20
10
1.2 1.4 1.6 1.8 2.0
06090-018
Figure 19. Slope-Compensation Current vs. f
SYNC
/f
OSC
1.6
0
–50 150
TEMPERATURE (°C)
SHUTDOWN IN CURRENT (µA)
0 50 100
1.4
1.2
1.0
0.8
0.6
0.4
0.2
V
IN
= 5V
SDSN = 0V
06090-019
Figure 20. Shutdown IN Current vs. Temperature
1.2165
1.2120
–50
150
TEMPERATURE (°C)
V
FB
(V)
0 50 100
V
IN
= 5V
SDSN = 0V
1.2160
1.2155
1.2150
1.2145
1.2140
1.2135
1.2130
1.2125
06090-020
Figure 21. FB Voltage vs. Temperature
CH1 5V CH2 5V
CH4 500mAΩ
M2µs A CH1 2.9V
1
2
4
T
A
= 25°C
V
IN
= 3.3V
V
OUT
= 5V
LOAD = 0.1A
DCM OPERATION
CH1 = GATE
CH4 = INDUCTOR CURRENT
CH2 = DRAIN VOLTAGE
06090-021
Figure 22. DCM Switching Waveform