W83301 datasheet(3/16 Pages) WINBOND

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Revision 0.6

W83301R

Preliminary

1. General Description

The W83301R is an ACPI-compliant controller for microprocessor and other

computer applications. In substance, the part can mainly operate in alternative

configurations mode A and B – mode A provides a switch controller to generate a 5VDL

voltage from ATX power supply, a linear controller – STR1 (2.5VDUAL), and a bus

termination controller – 1.25 VDUAL for high speed bus such as RDRAM/DDRAM

current sinking and sourcing; and mode B provides a switch controller to generate a

5VDL voltage from ATX power supply and three linear controllers for specific voltage

regulations – that is STR1 (2.5VDUAL), STR2 (3.3VDUAL) and STR3 (1.8 VDUAL), all of the

outputs can simply configured by VSET0, VSET1. Besides, the W83301R also can

provide extra voltage up to 0.2V in each regulator output for more performance. In

order to reduce the customer’s cost, and simplify the circuit design, the W83301R

integrates a charge-pump engine into the chip to provide higher driving voltage for

single N-channel MOSFETs, that is the W83301R, can drive only N-channel

MOSFETs for all applications. In the other hand, the W83301R also offer PWOK and

over current detection to protect each output and soft-start protects all linear

controllers from rush current attack. The W83301R is available in a 20-pin SOP

package.

2.Features

Provides alternative configurations for flexible applications

Mode A

Provide a switch controller to generate 5VDUAL

Linear controller STR1–2.5VDUAL (RDRAM/DDRAM application)

Bus termination controller –1.25VDUAL for high speed bus termination

application to sinking and sourcing redundant current

Mode B

Provide a switch controller to generate 5VDUAL

Linear controller STR1 – 2.5VDUAL (Clock Gen. Application)

Linear controller STR2 – 3.3 VDUAL (SDRAM Application)

Linear controller STR3 – 1.8VDUAL (Chipset Application)

Provide a switch to enable/disable 5VDL output in S5 state via 5VDLEN pin for USB

application

Supports SDRAM/RDRAM/DDRAM ACPI-STR Functions

Drives all N-Channel MOSFETs

Power-Up Softstart for all controllers

Up to 0.2V incremental voltage on STR1/STR2 for over-clock application.

Under-Voltage Fault Monitor

Soft-Start function

20-Pin SOP Package

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