Datasheet

LTC2974
15
2974fc
For more information www.linear.com/LTC2974
block DiagraM
10
3.3V REGULATOR
INTERNAL
TEMP
SENSOR
REFERENCE
1.232V
(TYP)
MASKING
CLOCK
GENERATION
OSCILLATOR
UVLOPORB
4 PAGES
V
DD
EXTERNAL
TEMPERATURE
SENSOR
EEPROM
RAM
ADC_RESULTS
MONITOR LIMITS
SERVO TARGETS
PMBus
INTERFACE
(400kHz I
2
C
COMPATIBLE)
CONTROLLER
PMBus ALGORITHM
FAULT PROCESSOR
WATCHDOG
SEQUENCER
V
IN
V
DD33
V
SENSEP0
V
SENSEM0
V
OUT
V
PWR
12
2.5V REGULATOR
V
IN
V
OUT
V
DD33(IN)
1
2
V
DAC0
V
DAC1
V
DAC2
V
DAC3
NC
NC
NC
NC
NC
NC
PAGE 0
PAGE 1
PAGE 2
PAGE 3
3
V
OUT_EN0
4
V
OUT_EN1
5
V
OUT_EN2
6
V
OUT_EN3
15
T
SENSE0
16
T
SENSE1
27
T
SENSE2
34
T
SENSE3
2974 BD
7
AUXFAULTB
13
V
DD25(OUT)
14
V
DD25(IN)
V
DD25
19
GND
20
GND
21
GND
37
GND
39
GND
65
GND
31
ALERTB
30
SCL
29
SDA
35
ASEL0
36
ASEL1
28
WP
23
CONTROL3
17
PWRGD
SHARE_CLK
18
24
WDI/RESETB
25
FAULTB0
26
FAULTB1
32
CONTROL0
33
22
CONTROL2
CONTROL1
11
V
DD33(OUT)
9
V
IN_SNS
8
DNC
REFP
REFM
3R
R
20Ω
I
SENSEP0
I
SENSEM0
V
SENSEP1
V
SENSEM1
I
SENSEP1
I
SENSEM1
V
SENSEP2
V
SENSEM2
I
SENSEP2
I
SENSEM2
V
SENSEP3
V
SENSEM3
I
SENSEP3
I
SENSEM3
16-BIT
∆∑ ADC
ADC
CLOCKS
V
DD33
+
–
+
–
38
40
10-BIT
VDAC
+
–
–
+
VCMP
VBUF
10-BIT
DAC
41
42
63
64
43
44
61
62
45
46
49
50
53
54
57
58
51
52
55
56
59
60
V
SENSEM0
V
SENSEP0
I
SENSEP0
I
SENSEM0
V
SENSEM1
V
SENSEP1
I
SENSEP1
I
SENSEM1
V
SENSEM2
V
SENSEP2
I
SENSEP2
I
SENSEM2
V
SENSEM3
V
SENSEP3
I
SENSEP3
48
I
SENSEM3
47
MUX
+
–
10-BIT
VDAC
+
–
–
+
ICMP
4 PAGES