RT9645 Datasheet, PDF (1/13 Pages) Richtek Technology Corporation – 5 Channels ACPI Regulator

Preliminary
RT9645
5 Channels ACPI Regulator
General Description
The RT9645 is a combo regulator which is compliant to
ACPI specification for desktop/server power management
and system application. The part features one switching
regulator for DDR memory VDDQ power; a second PWM
controller for GMCH core power, a LDO controller for
FSB_ VTT termination, a LDO controller for 5VSB to 3VSB
conversion; and a dual power control 5VDL for S0 and S3
system power.
The part is generally operated to conform to ACPI
specification. In S3 mode, only VDDQ and 3.3VSB
regulators remain on while the FSB_ VTT regulator is off.
In the transition from S3 to S0, an internal SS capacitor is
attached for linear regulators to control its slew rate
respectively to avoid inrush current induced.
RT9645 supports both Intel VR11 and AMD K8 platform.
There is extra control pin VTT_EN to enable FSB_VTT
regulator at AMD K8 mode. This part also implements
PWM1 (V_DDQ) enabled by release COMP1 at AMD K8
application. This part is assemblyed in the tiny
VQFN-24L 4x4 package.
Ordering Information
RT9645
Package Type
QV : VQFN-24L 4x4
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Pb-free and Green products are :
`RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
`Suitable for use in SnPb or Pb-free soldering processes.
`100% matte tin (Sn) plating.
Features
z Integrated 5 Channels Power Regulator
z DC/DC Buck PWM Regulator (Driver Included)
z DC/DC Buck PWM Controller
z Linear Regulator Controller for FSB_VTT Power
z 3.3VSB Linear Regulator Controller with 40mA
Output Capability
z 5VDL Switch Control
z Conform to ACPI Specification, Supporting Power
Management at S0, S3, and S5 State
z 300kHz Fixed Frequency Oscillator
z Low-Side R_DS(ON) Current Sensing for Precision
Over-Current Detection
z Thermal Shutdown
z Small 24-Lead VQFN Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Desktop System Power
z Server System Power
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
SB3V_DRV 1
18 VTT_DRV
VDD 2
17 VTT_SEN
PWM2 3
SS2/EN2 4
PGND
16 VTT_EN
15 ISNS2
COMP2 5
FB2 6
14 FB1
25
13 COMP1
7 8 9 10 11 12
VQFN-24L 4x4
DS9645-00 August 2007
www.richtek.com
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