ISL85001 Datasheet, PDF (8/15 Pages) Intersil Corporation – 1A Standard Buck PWM Regulator

ISL85001
Typical Performance Curves Unless otherwise noted, operating conditions are: T_A = +25°C, V_IN = 12V, EN = VDD, L = 22µH,
C9 = 10µF, C11 = 47µF, I_OUT = 0A to 1A. See “VIN (Pins 11, 12)” on page 6. (Continued)
1.814
2.506
1.813
1.812
1.811
25V_IN
12V_IN
2.505
2.504
2.503
25V_IN
12V_IN
1.810
2.502
1.809
2.501
1.808
1.807
5V_IN
1.806
0.0
0.2
0.4
0.6
0.8
1.0
OUTPUT LOAD (A)
FIGURE 8. V_OUT REGULATION vs LOAD, 500kHz, 1.8V_OUT
2.500
2.499
5V_IN
2.498
0.0
0.2
0.4
0.6
0.8
1.0
OUTPUT LOAD (A)
FIGURE 9. V_OUT REGULATION vs LOAD, 500kHz, 2.5V_OUT
3.330
3.328
3.326
25V_IN
12V_IN
3.324
3.322
3.320
3.318
7V_IN
3.316
3.3140.0
0.2
0.4
0.6
0.8
1.0
OUTPUT LOAD (A)
FIGURE 10. V_OUT REGULATION vs LOAD, 500kHz, 3.3V_OUT
4.99
4.98
4.97
4.96
25V_IN
4.95
4.94
7V_IN
4.93
4.92
12V_IN
4.910.1
0.3
0.5
0.7
0.9
OUTPUT LOAD (A)
FIGURE 11. V_OUT REGULATION vs LOAD, 500kHz, 5V_OUT
PHASE 5V/DIV
PHASE 5V/DIV
V_OUT RIPPLE
20mV/DIV
I_L 0.1A/DIV
FIGURE 12. STEADY STATE OPERATION AT NO LOAD
(5µs/DIV)
V_OUT RIPPLE
20mV/DIV
I_L 0.5A/DIV
FIGURE 13. STEADY STATE OPERATION AT FULL LOAD
(1µs/DIV)
8
FN6769.0
November 17, 2008