ADP1879 Analog Devices, ADP1879 Datasheet - Page 16

• 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
4.3 nF (High-/Low-Side MOSFET), Q
4.3 nF (High-/Low-Side MOSFET), Q
Figure 59. High-Side Driver Rising and Low-Side Falling Edge Waveforms (C
Figure 60. High-Side Driver Falling and Low-Side Rising Edge Waveforms (C
M
M
M
4
3
2
4
3
2
4
3
2
CH3 5V
MATH 2V 40ns
CH3 5V
MATH 2V 40ns
CH3 5V
MATH 2V 20ns
LOW SIDE
HS MINUS
SW
LOW SIDE
T
SW NODE
HS MINUS
SW
Figure 58. Output Drivers and SW Node Waveforms
A
HIGH SIDE
HS MINUS
SW
22ns (
= 25°C
18ns (
t
pdh
DRVH
t
r
,DRVL
CH2 5V
CH4 2V
CH2 5V
CH4 2V
CH2 5V
CH4 2V
)
)
TOTAL
TOTAL
T
16ns (
11ns (
A
= 25°C
24ns (
= 27 nC (V
= 27 nC (V
M20ns
M40ns
M40ns
T
T
T
t
t
f
f
,DRVH
,DRVL
39.2%
29.0%
29.0%
t
pdh
25ns (
)
)
,DRVL
GS
GS
HIGH SIDE
t
= 4.4 V (Q1), V
= 4.4 V (Q1), V
r
,DRVH
)
A CH2
HIGH SIDE
SW NODE
A CH2
A CH2
LOW SIDE
SW NODE
)
T
A
= 25°C
4.20V
4.20V
4.20V
GS
GS
= 5 V (Q3))
= 5 V (Q3))
Rev. 0 | Page 16 of 40
IN
IN
=
=
1.30
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
570
550
530
510
490
470
450
430
680
630
580
530
480
430
380
330
2.7
–40
2.7
Figure 61. Transconductance vs. Temperature
3.0
–20
3.1
Figure 62. Transconductance vs. V
Figure 63. Quiescent Current vs. V
3.3
0
3.5
3.6
TEMPERATURE (°C)
20
3.9
3.9
V
+125°C
V
+25°C
–40°C
REG
REG
40
(V)
4.2
(V)
4.3
60
4.5
4.7
80
REG
REG
4.8
Data Sheet
V
V
V
REG
REG
REG
100
5.1
5.1
+125°C
+25°C
–40°C
= 5.5V
= 3.6V
= 2.7V
120
5.4
5.5