FAN5056MV85 Datasheet, PDF (7/15 Pages) Fairchild Semiconductor – High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms

FAN5056MV85
Typical Operating Characteristics (continued)
Output Startup, System Power-up
PRODUCT SPECIFICATION
Output Startup from Enable
Time (10ms/division)
Time (20ms/div)
Application Circuit
L1
(Optional)
+5V
C_IN
VO
C_OUT
R6
C1
R7
R5
C2
R2
Q1
L2
Q2
D1
R3
3.3V IN
Q3
1.2V†
C8
Q4
2.5V†
C9
VID4
VID3
VID2
VID1
VID0
1
24
2
23
3
22
4
U1
21
5 _FAN5056V85 20
6
19
7
18
8
17
9
16
10
11
15
14
TYPEDET
12
13
R1
+12V
C5
C3
VCC
Q5
C4
3.3/1.5V
C7 ^(AGP)†
ENABLE/SS
R4
PWRGD
C6
† Adjustable with an external divider.
Figure 1. Application Circuit for VRM8.5 Motherboards
(Worst Case Analyzed! See Appendix for Details)
7
REV. 1.0.6 6/26/01