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ISL78228ARZ-T Datasheet, PDF (6/18 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.
100
100
90
90
80
2.5VOUT - PWM
70
1.5VOUT - PWM
60
1.2VOUT - PWM
1.8VOUT - PWM
50
80
2.5VOUT - PFM
70
1.8VOUT - PFM
1.2VOUT - PFM
60
1.5VOUT - PFM
50
40
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD 2.25MHz 3.3VIN PWM
40
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
OUTPUT LOAD (A)
FIGURE 3. EFFICIENCY vs LOAD 2.25MHz 3.3VIN PFM
100
90
80
2.5VOUT - PWM
70
3.3VOUT - PWM
1.5VOUT - PWM
60
1.2VOUT - PWM 1.8VOUT - PWM
50
40
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
OUTPUT LOAD (A)
FIGURE 4. EFFICIENCY vs LOAD 2.25MHz 5VIN PWM
100
90
80
70
1.5VOUT - PFM 1.2VOUT - PFM
60
3.3VOUT - PFM
1.8VOUT - PFM
50
2.5VOUT - PFM
40
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
OUTPUT LOAD (A)
FIGURE 5. EFFICIENCY vs LOAD 2.25MHz 5VIN PFM
0.30
0.25 3.3VIN - PWM MODE
0.20
5VIN - PWM MODE
0.15
0.10
5VIN - PFM MODE
0.05
3.3VIN - PFM
0.00
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
OUTPUT LOAD (A)
FIGURE 6. POWER DISSIPATION vs LOAD 2.25MHz 1.8VOUT PWM
1.23
1.22
1.21
5VIN PFM MODE
5VIN PWM MODE
1.20
1.19
1.18
3.3V VIN PWM
3.3V VIN PFM
1.17
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
OUTPUT LOAD (A)
FIGURE 7. VOUT REGULATION vs LOAD 2.25MHz 1.2VOUT PFM
6
FN7849.2
December 4, 2013
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