ISL78228 Datasheet, PDF (7/18 Pages) Intersil Corporation – Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

ISL78228
Typical Operating Performance Unless otherwise noted, operating conditions are: T_A = +25°C,
V_IN = 2.75V to 5.5V, EN = V_IN, L₁ = L₂ = 2.2µH, C₁ = 10µF, C₂ = C₄ = 10µF, V_OUT1 = 2.5V, V_OUT2 = 1.8V, I_OUT1 = I_OUT2 =
0A to 800mA. (Continued)
1.56
1.55
1.54
1.53
5 V_IN PFM MODE
3.3V V_IN PFM
1.84
1.83
1.82
1.81
5 V_IN PFM MODE
3.3V V_IN PFM
5V_IN PWM MODE
1.52
1.51
3.3V V_IN PWM
5V_IN PWM MODE
1.50
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
OUTPUT LOAD (A)
FIGURE 8. V_OUT REGULATION vs LOAD 2.25MHz 1.5V_OUT
1.80
1.79
3.3V V_IN PWM
1.78
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
OUTPUT LOAD (A)
FIGURE 9. V_OUT REGULATION vs LOAD 2.25MHz 1.8V_OUT
2.55
2.54
2.53
2.52
2.51
5V V_IN PFM
3.3V V_IN PFM
3.3V V_IN PWM
5V V_IN PWM
2.50
2.49
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
OUTPUT LOAD (A)
FIGURE 10. V_OUT REGULATION vs LOAD 2.25MHz 2.5V_OUT
3.42
3.40
3.38
3.36
3.34
5V V_IN PFM
5V V_IN PWM
3.32
3.30
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
OUTPUT LOAD (A)
FIGURE 11. V_OUT REGULATION vs LOAD 2.25MHz 3.3V_OUT
1.83
1.82
1.81
0A LOAD PWM
1.80
1.79
1.78
0.8A LOAD PWM
0.4A LOAD PWM
1.77
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
INPUT VOLTAGE (V)
FIGURE 12. OUTPUT VOLTAGE REGULATION vs V_IN 1.8V_OUT
PWM MODE
1.83
1.82
1.81
0A LOAD
0.4A LOAD
1.80
1.79
1.78
0.8A LOAD
1.77
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
INPUT VOLTAGE (V)
FIGURE 13. OUTPUT VOLTAGE REGULATION vs V_IN 1.8V_OUT
PFM MODE
7
FN7849.0
May 2, 2011