Datasheet

ADP2126/ADP2127 Data Sheet
Rev. B | Page 10 of 20
TIME (100µs/DIV)
OUTPUT VOLTAGE (500mV/DIV)
INDUCTOR CURRENT (200mA/DIV)
EXTCLK PIN VOLTAGE (5V/DIV)
NO LOAD
09658-024
1
4
2
Figure 23. Startup, No Load
TIME (100µs/DIV)
OUTPUT VOLTAGE (500mV/DIV)
INDUCTOR CURRENT (200mA/DIV)
EXTCLK PIN VOLTAGE (5V/DIV)
R
LOAD
= 3.6Ω
09658-025
1
2
4
Figure 24. Startup, R
LOAD
= 3.6 Ω
5.50
5.45
5.40
5.35
5.30
5.25
–2.0 –1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0
FREQUENCY (MHz)
TIME (ns)
09658-026
Figure 25. Spread Spectrum Switching Frequency
TIME (400ns/DIV)
OUTPUT VOLTAGE (20mV/DIV)
1.20V OFFSET
INDUCTOR CURRENT (200mA/DIV)
SW PIN VOLTAGE (5V/DIV)
I
LOAD
= 100mA
09658-027
1
2
4
Figure 26. Typical PFM Mode Operation, I
LOAD
= 100 mA
TIME (100ns/DIV)
OUTPUT VOLTAGE (10mV/DIV)
1.20V OFFSET
INDUCTOR CURRENT (200mA/DIV)
SW PIN VOLTAGE (5V/DIV)
I
LOAD
= 150mA
09658-028
1
4
4
Figure 27. Typical PWM Mode Operation, I
LOAD
= 150 mA