Datasheet

ADP1870/ADP1871 Data Sheet
Rev. B | Page 12 of 44
1000
1450
1400
1350
1300
1250
1200
1150
1100
1050
0 8000800 1600 2400 3200 4000 4800 5600 6400 7200
FREQUENCY (kHz)
LOAD CURRENT (mA)
V
IN
= 16.5V
V
IN
= 13V +125°C
+25°C
–40°C
08730-033
Figure 34. Frequency vs. Load Current, 1.0 MHz, V
OUT
= 5 V
2.649
2.658
2.657
2.656
2.655
2.654
2.653
2.652
2.651
2.650
–40 120100806040200–20
UVLO (V)
TEMPERATURE (°C)
08730-034
Figure 35. UVLO vs. Temperature
55
60
65
70
75
80
85
90
95
300 400 500 600 700 800 900 1000
MAXIMUM DUTY CYCLE (%)
FREQUENCY (kHz)
+125°C
+25°C
–40°C
08730-035
Figure 36. Maximum Duty Cycle vs. Frequency
62
64
66
68
70
72
74
76
78
80
82
5.5 6.7 7.9 9.1 10.3 11.5 12.7 13.9 15.1 16.3
MAXIMUM DUTY CYCLE (%)
V
IN
(V)
+125°C
+25°C
–40°C
08730-036
Figure 37. Maximum Duty Cycle vs. High Voltage Input (V
IN
)
180
680
630
580
530
480
430
380
330
280
230
–40 120100806040200–20
MINUMUM OFF-TIME (ns)
TEMPERATURE (°C)
V
REG
= 2.7V
V
REG
= 5.5V
V
REG
= 3.6V
08730-037
Figure 38. Minimum Off-Time vs. Temperature
180
680
630
580
530
480
430
380
330
280
230
2.7 5.55.14.74.33.93.53.1
MINUMUM OFF-TIME (ns)
V
REG
(V)
+125°C
+25°C
–40°C
08730-038
Figure 39. Minimum Off-Time vs. V
REG
(Low Input Voltage)