ADP1879 Analog Devices, ADP1879 Datasheet - Page 12

• Manufacturer Part Number: ADP1879
• Description: Synchronous Buck Controller with Constant On-Time and Valley Current Mode with Power Saving Mode
• Manufacturer: Analog Devices

ADP1878/ADP1879
1450
1400
1350
1300
1250
1200
1150
1100
1050
1000
2.658
2.657
2.656
2.655
2.654
2.653
2.652
2.651
2.650
2.649
95
90
85
80
75
70
65
60
55
Figure 34. Frequency vs. Load Current, 1.0 MHz, V
300
0
–40
Figure 36. Maximum Duty Cycle vs. Frequency
800
400
–20
V
V
1600 2400 3200 4000 4800 5600 6400 7200
IN
IN
Figure 35. UVLO vs. Temperature
= 13V
= 16.5V
0
500
LOAD CURRENT (mA)
FREQUENCY (kHz)
TEMPERATURE (°C)
20
600
40
+125°C
+25°C
–40°C
700
60
800
80
900
OUT
100
+125°C
+25°C
–40°C
= 5 V
8000
120
1000
Rev. 0 | Page 12 of 40
680
630
580
530
480
430
380
330
280
230
180
Figure 37. Maximum Duty Cycle vs. High Voltage Input (V
680
630
580
530
480
430
380
330
280
230
180
82
80
78
76
74
72
70
68
66
64
62
Figure 39. Minimum Off Time vs. V
2.7
5.5
–40
Figure 38. Minimum Off Time vs. Temperature
6.7
–20
3.1
+125°C
+25°C
–40°C
V
V
V
REG
REG
REG
7.9
0
= 2.7V
= 3.6V
= 5.5V
3.5
9.1
TEMPERATURE (°C)
20
3.9
10.3
V
REG
V
IN
40
(V)
11.5
(V)
4.3
REG
60
(Low Input Voltage)
12.7
4.7
80
13.9
Data Sheet
100
5.1
15.1
+125°C
+25°C
–40°C
IN
120
16.3
)
5.5