ISL81801

4. Typical Performance Graphs

FN8937 Rev.1.4

Page 20 of 49

Mar 8, 2024

Figure 13. Switching Frequency vs Temperature

Figure 14. Switching Frequency vs VIN, RT = 144k

Figure 15. 0.8V Reference Voltage vs Temperature

Figure 16. 1.2V Reference Voltage vs Temperature

Figure 17. Normalized Output Voltage vs Voltage on

Soft-Start Pin

Figure 18. Input Current IIN (DC) vs IMON_IN Pin Voltage,

RS_IN = 4mΩ, RIM_IN = 36k

Oscilloscope plots are taken using the ISL81801EVAL1Z evaluation board, VIN = 9V to 80V, VOUT = 12V, IOUT = 10A, unless otherwise noted.

200

250

300

350

400

450

500

-50

0

50

100

150

Temperature (ºC)

RT = 72kHz

RT = 144kHz

234

236

238

240

242

244

246

248

250

0

1020304050607080

90

VIN (V)

0.792

0.794

0.796

0.798

0.800

0.802

0.804

0.806

0.808

-50

0

50

100

150

Temperature (ºC)

1.195

1.196

1.197

1.198

1.199

1.200

1.201

1.202

1.203

1.204

1.205

-50

0

50

100

150

Temperature (ºC)

0

20

40

60

80

100

120

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Soft-Start Pin Voltage (V)

0.60

0.65

0.70

0.75

0.80

0.85

0.90

0.95

1.00

1.05

02468

10

IIN (A)

+25C

+125C

-40C