ISL8022
Typical Operating Performance (Unless otherwise noted) operating conditions are:
TA = +25°C, VVIN = 2.8V to 5.5V, EN = VIN, L1 = L2 = 1.2µH, C1 = 10µF, C2 = C4 = 22µF, IOUT1 = 0A to 2A,
IOUT2 = 0A to 1.7A. (Continued)
LX1 2V/DIV
LX2 2V/DIV
VOUT1 RIPPLE 20mV/DIV
VOUT2 RIPPLE 20mV/DIV
IL1 0.2A/DIV TB = 200ns/DIV
FIGURE 13. STEADY STATE OPERATION AT NO LOAD
CHANNEL 1 (PWM)
IL2 0.2A/DIV
TB = 200ns/DIV
FIGURE 14. STEADY STATE OPERATION AT NO LOAD
CHANNEL 2 (PWM)
LX1 2V/DIV
VOUT1 RIPPLE 20mV/DIV
IL1 0.5A/DIV
TB = 500ns/DIV
FIGURE 15. STEADY STATE OPERATION AT NO LOAD
CHANNEL 1 (PFM)
LX2 2V/DIV
VOUT2 RIPPLE 20mV/DIV
IL2 0.5A/DIV
TB = 500ns/DIV
FIGURE 16. STEADY STATE OPERATION AT NO LOAD
CHANNEL 2 (PFM)
LX1 2V/DIV
LX2 2V/DIV
VOUT1 RIPPLE 20mV/DIV
IL1 1A/DIV
TB = 200ns/DIV
VOUT2 RIPPLE 20mV/DIV
IL2 1A/DIV
TB = 200ns/DIV
FIGURE 17. STEADY STATE OPERATION AT FULL LOAD
CHANNEL 1
FIGURE 18. STEADY STATE OPERATION WITH FULL
LOAD CHANNEL 2
9
FN7650.1
August 25, 2010