Datasheet

LTC2978A
17
2978afa
For more information www.linear.com/LTC2978A
BLOCK DIAGRAM
15
3.3V REGULATOR
INTERNAL
TEMP
SENSOR
REFERENCE
1.232V
(TYP)
OUTPUT
CONFIG
CLOCK
GENERATION
OSCILLATOR
8 PAGES
UVLO
V
DD
OPEN-DRAIN
OUTPUT
EEPROM
NONVOLATILE MEMORY
RAM
ADC_RESULTS
MONITOR LIMITS
SERVO TARGETS
PMBus
INTERFACE
(400kHz I
2
C
COMPATIBLE)
CONTROLLER
PMBus ALGORITHM
FAULT PROCESSOR
WATCHDOG
SEQUENCER
V
IN
V
DD
V
SENSEM0
V
SENSEP0
V
OUT
V
PWR
17
2.5V REGULATOR
V
IN
V
OUT
V
DD33
36
V
SENSEP0
37
V
SENSEM0
V
SENSEP1
V
SENSEM1
V
SENSEP2
V
SENSEM2
V
SENSEP3
V
SENSEM3
V
SENSEP4
V
SENSEM4
V
SENSEP5
V
SENSEM5
V
SENSEP6
V
SENSEM6
2
V
SENSEP7
3
V
SENSEM7
V
DACP0
V
DACP1
V
DACP2
V
DACP3
V
DACP4
V
DACP5
V
DACP6
V
DACP7
V
DACM0
V
DACM1
V
DACM2
V
DACM3
V
DACM4
V
DACM5
V
DACM6
V
DACM7
4
V
OUT_EN0
5
V
OUT_EN1
6
V
OUT_EN2
7
V
OUT_EN3
8
V
OUT_EN4
9
V
OUT_EN5
10
V
OUT_EN6
11
V
OUT_EN7
2978a BD
12
V
IN_EN
18
V
DD25
65
GND
28
SCL
27
SDA
29
ALERTB
32
ASEL0
33
ASEL1
30
CONTROL0
19
WP
31
CONTROL1
WDI/RESETB
22
23
FAULTB00
24
FAULTB01
25
FAULTB10
26
FAULTB11
20
21
SHARE_CLK
PWRGD
16
V
DD33
14
V
IN_SNS
REFP
REFM
3R
R
V
SENSEM1
V
SENSEP1
V
SENSEM2
V
SENSEP2
V
SENSEM3
V
SENSEP3
V
SENSEM4
V
SENSEP4
V
SENSEM5
V
SENSEP5
V
SENSEM6
V
SENSEP6
V
SENSEM7
V
SENSEP7
16-BIT
∆∑ ADC
ADC
CLOCKS
V
DD
+
–
+
–
MUX
34
35
10-BIT
DAC
+
+
–
–
CMP0
VBUF
10-BIT
DAC
42
43
46
47
48
49
52
53
62
63
64
1
39
40
44
50
55
56
60
38
41
45
51
54
57
58
61
59
PAGE 7
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