Datasheet

Data Sheet ADN8831
Rev. A | Page 3 of 20
DETAILED BLOCK DIAGRAM
ADN8831
REFERENCE
VB
1.25V
80kΩ
2kΩ
10kΩ
8
7
6
5
4
3
2
1
ILIMC
IN1P
IN1N
OUT1
IN2P
IN2N
OUT2
32
31
30
29
28
27
26
25
24
22
21
18
17
16
15
14
12
11109
TEMPERATURE
GOOD
2.5V
20
19
COMPSW
SFB
PGND
SNGATE
DRIVER
SW
SPGATE
PVDD
COMPOSC
SOFT START
SB
250mV
OSCILLATOR
SD
SD
DETECT
13
ITEC
ILIMC
ILIMH
100kΩ
100kΩ
20kΩ
20kΩ
LFB
LINEAR AMPLIFIER
LPGATELNGATELFB
VB
VC
23
VB
g
m
3
g
m
2
g
m
1
VC
20kΩ
20kΩ
20kΩ
20kΩ
1.25V
1.25V
VB
Chop2
Chop1
VB
= 2.5V, V
DD
> 4.0V
= 1.5V, V
DD
< 4.0V
ILIMH VLIM
VTEC ITEC CS
VOLTAGE
LIMIT
25kΩ
20kΩ 20kΩ
5kΩ
SFB LFB
1.25V
1kΩ
25kΩ
VREF
04663-003
5kΩ
1kΩ
AVDD PHASE TMPGD AGND FREQ SYNCO SYNCI/SD
SS/SB
Figure 2. Detailed Block Diagram