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| ISL78228 Datasheet, PDF (9/18 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)
VOUT1 RIPPLE 20mV/DIV
VOUT2 RIPPLE 20mV/DIV
IL1 0.5A/DIV
IL2 0.5A/DIV
50µs/DIV
FIGURE 20. LOAD TRANSIENT CHANNEL 1 (PWM)
50µs/DIV
FIGURE 21. LOAD TRANSIENT CHANNEL 2 (PWM)
LX1 2V/DIV
50µs/DIV
VOUT1 RIPPLE 50mV/DIV
IL1 0.5A/DIV
FIGURE 22. LOAD TRANSIENT CHANNEL 1 (PFM)
50µs/DIV
EN1 2V/DIV
VOUT1 1V/DIV
IL1 0.5A/DIV
PG 5V/DIV
FIGURE 24. SOFT-START WITH NO LOAD CHANNEL 1 (PWM)
LX2 2V/DIV
50µs/DIV
VOUT2 RIPPLE 50mV/DIV
IL2 0.5A/DIV
FIGURE 23. LOAD TRANSIENT CHANNEL 2 (PFM)
50µs/DIV
EN2 2V/DIV
VOUT2 0.5V/DIV
IL2 0.5A/DIV
PG 5V/DIV
FIGURE 25. SOFT-START WITH NO LOAD CHANNEL 2 (PWM)
9
FN7849.0
May 2, 2011
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