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| ISL78228 Datasheet, PDF (8/18 Pages) Intersil Corporation – Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator | |||
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ISL78228
Typical Operating Performance Unless otherwise noted, operating conditions are: TA = +25°C,
VIN = 2.75V to 5.5V, EN = VIN, L1 = L2 = 2.2µH, C1 = 10µF, C2 = C4 = 10µF, VOUT1 = 2.5V, VOUT2 = 1.8V, IOUT1 = IOUT2 =
0A to 800mA. (Continued)
500ns/DIV
LX1 2V/DIV
500ns/DIV
LX2 2V/DIV
VOUT1 RIPPLE 20mV/DIV
IL1 0.5A/DIV
FIGURE 14. STEADY STATE OPERATION AT NO LOAD CHANNEL 1
(PWM)
VOUT2 RIPPLE 20mV/DIV
IL2 0.5A/DIV
FIGURE 15. STEADY STATE OPERATION AT NO LOAD CHANNEL 2
(PWM)
500ns/DIV
LX1 2V/DIV
500ns/DIV
LX2 2V/DIV
VOUT1 RIPPLE 20mV/DIV
IL1 0.5A/DIV
FIGURE 16. STEADY STATE OPERATION AT NO LOAD CHANNEL 1
(PFM)
VOUT2 RIPPLE 20mV/DIV
IL2 0.5A/DIV
FIGURE 17. STEADY STATE OPERATION AT NO LOAD CHANNEL 2
(PFM)
LX1 2V/DIV
VOUT1 RIPPLE 20mV/DIV
500ns/DIV
IL1 0.5A/DIV
FIGURE 18. STEADY STATE OPERATION WITH FULL LOAD
CHANNEL 1
LX2 2V/DIV
VOUT2 RIPPLE 20mV/DIV
500ns/DIV
IL2 0.5A/DIV
FIGURE 19. STEADY STATE OPERATION WITH FULL LOAD
CHANNEL 2
8
FN7849.0
May 2, 2011
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