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| ISL78228ARZ-T Datasheet, PDF (10/18 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)
50µs/DIV
EN1 2V/DIV
VOUT1 1V/DIV
50µs/DIV
EN2 2V/DIV
VOUT2 0.5V/DIV
ILIL00.5.A5/AD/IVDIV
PG 5V/DIV
FIGURE 26. SOFT-START AT NO LOAD CHANNEL 1 (PFM)
IL2 0.5A/DIV
PG 5V/DIV
FIGURE 27. SOFT-START AT NO LOAD CHANNEL 2 (PFM)
50µs/DIV
EN1 2V/DIV
VOUT1 1V/DIV
IL1 0.5A/DIV
PG 5V/DIV
FIGURE 28. SOFT-START AT FULL LOAD CHANNEL 1
1ms/DIV
EN1 5V/DIV
VOUT1 1V/DIV
IL1 0.5A/DIV
PG 5V/DIV
FIGURE 30. SOFT-DISCHARGE SHUTDOWN CHANNEL 1
50µs/DIV
EN2 2V/DIV
VOUT2 0.5V/DIV
IL2 0.5A/DIV
PG 5V/DIV
FIGURE 29. SOFT-START AT FULL LOAD CHANNEL 2
EN2 5V/DIV
VOUT2 0.5V/DIV
1ms/DIV
IL2 0.5A/DIV
PG 5V/DIV
FIGURE 31. SOFT-DISCHARGE SHUTDOWN CHANNEL 2
10
FN7849.2
December 4, 2013
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