FAN5071 View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

FAN5071

High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms

Fairchild Semiconductor 

FAN5071

Typical Operating Characteristics (continued)

Output Startup, System Power-up

Output Startup from Enable

Time (10ms/division)

Time (20ms/div)

Application Circuit

L1

(Optional)

+5V

CIN

R7

R5

C2

R2

Q1

L2

VO

COUT

Q2

D1

R3

VID4

VID3

VID2

VID1

VID0

R8–12

3.3V IN

Q3

1.2V†

Q4

C8

2.5V†

C9

R6

C1

1

2

3

4

U1

5

FAN5071

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

TYPEDET

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. 1.0.4 1/29/02

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