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Part Name
Description
FAN5031 View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
FAN5031
8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller
Fairchild Semiconductor
FAN5031 Datasheet PDF : 3 Pages
1
2
3
FAN5031 Block Diagram
VCC
31
GND
18
UVLO
SHUTDOWN
& BIAS
850mV
–
EN
1
+
DAC+150mV
–
CSREF
+
+
DAC-250mV
–
PWRGD
2
DELAY
TTSENSE
10
VRHOT
9
VRFAN
8
THERMAL
THROTTLING
CONTROL
ILIMIT
11
DELAY
7
RT RAMPADJ
12
13
OSCILLATOR
CURRENT
BALANCING
CIRCUIT
+
CMP
–
+
CMP
–
+
CMP
–
+
CMP
–
SET EN
RESET
RESET
RESET
RESET
19
OD
30
PWM1
29
PWM2
28
PWM3
27
PWM4
2 / 3 / 4-PHASE
DRIVER LOGIC
26
NC
CROWBAR
CURRENT
LIMIT
25
SW1
24
SW2
23
SW3
22
SW4
21
NC
CURRENT
LIMIT
CIRCUIT
Z
17
CSCOMP
15
CSREF
16
CSSUM
14
LLSET
COMP
5
FBRTN
3
VIDSEL
40
PRECISION
REFERENCE
Boot Control
STARTUP
CONTROL
VID
DAC
32
33
34
35
36
37
38
39
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0
Figure 1. Block Diagram
DAC
BUFF
2
FAN5031 Rev. 1.0.1
4
FB
6
SS
www.fairchildsemi.com
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