ISL78322 Datasheet, PDF (7/18 Pages) Intersil Corporation – Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

ISL78322
Typical Operating Performance (Unless otherwise noted) operating conditions are:
T_A = +25°C, V_VIN = 2.8V to 5.5V, EN = V_IN, L₁ = L₂ = 1.2µH, C₁ = 10µF, C₂ = C₄ = 22µF, I_OUT1 = 0A to 2A, I_OUT2 = 0A to 1.7A.
100
100
3.3V_OUT2
90
90
80
1.8V_OUT2
70 2.5V_OUT1
60
1.5V_OUT2
1.2V_OUT1
80
1.8V_OUT2
70
2.5V_OUT1
60
1.5V_OUT1
1.2V_OUT1
50
50
40
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT LOAD (A)
FIGURE 3. EFFICIENCY vs LOAD, 2.25MHz, 3.3V_IN PWM
40
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT LOAD (A)
FIGURE 4. EFFICIENCY vs LOAD, 2.25MHz, 5V_IN PWM
100
90
80
70 ^2.5VOUT1
1.8V_OUT2
1.5V_OUT1
60
1.2V_OUT1
50
40
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT LOAD (A)
FIGURE 5. EFFICIENCY vs LOAD, 2.25MHz, 3.3V_IN PFM
100
3.3V_OUT2
90
80
1.8V_OUT2
70
2.5V_OUT1
1.5V_OUT1
1.2V_OUT1
60
50
40
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT LOAD (A)
FIGURE 6. EFFICIENCY vs LOAD, 2.25MHz, 5V_IN PFM
0.90
0.75
3.3V_IN PWM
0.60
0.45
0.30
5 V_IN PWM
0.15
3.3V_IN PFM
0.00
5V_IN PFM
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT LOAD (A)
FIGURE 7. POWER DISSIPATION vs LOAD, 2.25MHz, 1.8V,
CHANNEL 2
1.23
1.22
5 V_IN PFM
1.21
3.3V V_IN PFM
1.20
1.19
1.18
5V_IN PWM
3.3V V_IN PWM
1.17
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT LOAD (A)
FIGURE 8. V_OUT REGULATION vs LOAD, 2.25MHz, 1.2V, CHANNEL 1
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FN7908.2
August 26, 2014