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ISL78228_15 Datasheet, PDF (12/18 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)
PHASE1 5V/DIV
LX1 5V/DIV
VOUT1 1V/DIV
IL1 0.5A/DIV
VOUT1 1V/DIV
IL1 0.5A/DIV
PG 5V/DIV
10µs/DIV
FIGURE 38. OUTPUT SHORT CIRCUIT CHANNEL 1
PG 5V/DIV
500µs/DIV
FIGURE 39. OUTPUT SHORT CIRCUIT RECOVERY CHANNEL 1
PHASE2 5V/DIV
IL2 0.5A/DIV
VOUT2 1V/DIV
PG 5V/DIV
10µs/DIV
FIGURE 40. OUTPUT SHORT CIRCUIT CHANNEL 2
LX2 5V/DIV
VOUT2 0.5V/DIV
IL2 0.5A/DIV
PG 5V/DIV
500µs/DIV
FIGURE 41. OUTPUT SHORT CIRCUIT RECOVERY CHANNEL 2
2.4
VIN 6V IOUT1
VIN 6V IOUT2
2.0
1.6
1.2
0.8
VIN 3.5V IOUT2
0.4
VIN 3.5V IOUT1
0-50
-30
-10
10
20
50
70
TEMPERATURE (°C)
90 110
FIGURE 42. OUTPUT CURRENT LIMIT vs TEMPERATURE
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FN7849.3
April 13, 2015
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