
ISL8510
Typical Performance Curves
5.1
5.0
4.9
4.8
Circuit of Figure 2. V IN = 12V, VIN_LDO = V OUT = 3.3V, I OUT = 1A, VLDO = 1.2V, I LDO = 450mA,
T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C. (Continued)
6
5
4
50mA LOAD
3
4.7
4.6
4.5
2
1
NO LOAD
4.4
0
50
100
150
200
0
0
5
10
15
20
25
30
I V CC (mA)
FIGURE 15. V CC LOAD REGULATION
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
7V IN
12V IN
V IN (V)
FIGURE 16. V CC REGULATION WITH V IN
25V IN
0
100
200
300
400
500
600
700
OUTPUT LOAD (mA)
FIGURE 17. LDO vs LOAD, 500kHz, V IN LDO = 3.3V
LX 5V/DIV
LX 5V/DIV
V OUT RIPPLE
20mV/DIV
V OUT RIPPLE
20mV/DIV
IL 0.5A/DIV
IL 0.2A/DIV
LDO RIPPLE
20m/DIV
LDO RIPPLE
20mV/DIV
FIGURE 18. STEADY STATE OPERATION AT NO LOAD,
20μs/DIV
11
FIGURE 19. STEADY STATE OPERATION AT FULL LOAD,
2μs/DIV
FN6516.2
December 15, 2008