ISL78213 Datasheet, PDF (6/15 Pages) Intersil Corporation – 3A Low Quiescent Current, High Efficiency Synchronous Buck Regulator

ISL78213
Typical Operating Performance
Unless otherwise noted, operating conditions are: T_A = +25°C, V_VIN = 2.5V to 5.5V, EN = V_IN, SYNCH = 0V, L = 1.5µH,
C₁ = 2x22µF, C₂ = 2x22µF, I_OUT = 0A to 3A.
100
100
90
80
2.5V_{OUT-PWM1.8VOUT-PWM}
1.5V_OUT-PWM
70
1.2V_OUT-PWM
60
90
80
2.5V_OUT-PFM
1.8V_OUT-PFM 1.5V_OUT-PFM
70
1.2V_OUT-PFM
60
50
50
40
0.0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT LOAD (A)
FIGURE 3. EFFICIENCY vs LOAD (1MHz 3.3 V_IN PWM)
40
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
OUTPUT LOAD (A)
FIGURE 4. EFFICIENCY vs LOAD (1MHz 3.3 V_IN PFM)
100
90
80
2.5V_OUT-PW¹_M^{.8VOUT-PWM 1.5VOUT-PWM}
70
3.3V_OUT-PWM
1.2V_OUT-PWM
60
50
40
0.0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT LOAD (A)
FIGURE 5. EFFICIENCY vs LOAD (1MHz 5V_IN PWM)
100
90
80
70
2.5V_OUT-PFM ^{1.8VOUT-PFM1.5VOUT1-.P2FVMOUT-PFM}
3.3V_OUT-PFM
60
50
40
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
OUTPUT LOAD (A)
FIGURE 6. EFFICIENCY vs LOAD (1MHz 5V_IN PFM)
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
3.3V_IN-PWM
3.3V_IN-PFM ^5VIN-PFM
5V_IN-PWM
0.00
0.0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT LOAD (A)
FIGURE 7. POWER DISSIPATION vs LOAD (1MHz,
V_OUT = 1.8V)
6
125
100
75
50
25
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
FIGURE 8. POWER DISSIPATION WITH NO LOAD vs
V_IN (PWM V_OUT = 1.8V)
FN7550.1
March 16, 2010