W83305S Nuvoton Technology Corporation of America, W83305S Datasheet - Page 4

• Manufacturer Part Number: W83305S
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83305S

• Lead Free Status / Rohs Status: Supplier Unconfirmed

1. GENERAL DESCRIPTION
W83305S is a new power management IC which compliant ACPI specification 2.0 for desktop PC and
motherboard. The chip regulates two most voltage-relative powers for DDR SDRAM and AGP slot
applications. As the two devices on board, a stable, reliable, and programmable power should be
performed for higher reliability, stability, compatibility and better-performance for diverse combination
of devices (RAM module and AGP card). The chip is operated basing on a simple dual-wire bus
SMBus. Via SMBus control, the power for DDR SDRAM can be adjusted ranging from 2.50V to 3.00V;
and the power for AGP slot can be adjusted ranging from 1.50V to 2.00V with 50mV/step. Besides for
safety consideration, linear under voltage and soft-start are applied on the two regulated powers. With
design of W83305S, a cost-effective, sample, modular, stable, reliable, flexible and high-
performance power solution is provides for the motherboard and desktop PC design.
2. FEATURES
3. PIN CONFIGURATION
Provides ACPI-Compliant Voltages
I2C Interface
Internal Charge Pump Support Voltage Up to 9.5V
Drive All N-Channel MOSFET
Soft Start
Under-Voltage Protection for VAGP, VRAM
Small footprint package 14-SOP 150mil
- Programmable 2.55V
- Programmable 1.55V
VRAM_DRV
VRAM_SEN
VCC5
SDA
SCL
S4#
SS
STR
CC
Power for AGP Slot
Power for DDR SDRAM
3
4
5
6
7
1
2
W83305S
inbond
- 1 -
14
13
12
11
10
W83305S/W83305G
Publication Release Date: April, 2006
9
8
S3#
VAGP_SEN
VAGP_DRV
5VSB
CHARPMP
CIN
GND
Revision 0.5