US3021B 查看數據表（PDF） - Unisem

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US3021B

5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPPLE LDO CONTROLLER

Unisem 

US3021B

TYPICAL APPLICATION

(Dual Layout with HIP6021)

R1

12V

5V

C1

Type Detect

3.3Vin

C6

Vout2

1.5V / 3.3V

Vout3

1.5V

Vout4

1.8V

L1

C2

R15 R3

R5

Q2

C13

Q4

C18

Q5

C19

C5

R2

C4

C3

28

V12

9 SD

23

OCSET

R4

UGATE 27

Q1

2 FIX

11 SELECT

PHASE 26

R7

LGATE 25

Q3

16 Vaux

PGND 24

VSEN1 22

1 DRIVE2

FB 21

10 VSEN2

R9 C16

U1

V5 20

(COMP)

C15

C17 R12

L2

C7

C22

R14 R6

R10

R8 C14

R11

Vcore

18 DRIVE3

19 VSEN3

VID0 7

VID1 6

VID2 5

VID3 4

VID4 3

PGOOD 8

15 DRIVE4

FAULT/RT 13

VSEN4

14

3021Bapp2-1.0

GND

17

SS

12

C20

Vcc3

R13

C21

PGood

Figure 2 - Typical application of US3021B in a dual layout with HIP6021 for an on board DC-DC converter

providing power for the Vcore , GTL+, 1.8V chip set supply as well as auto select AGP supply for the next

generation PC applications.

Part#

HIP6021

US3021B

S - Short

R3 R5

OS

OO

O - Open

R9 R10 R15 C15 C16 C17

OV OOV V

OOS V OO

V - See Unisem or Harris parts list for the value.

Table 2 - Dual layout component table

Note 1: If Q4 and Q5 are changed to MOSFETs such as IRLR024, then R2 is short and R4 is open.

Rev. 1.4

12/8/00

4-7

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