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  Richtek Technology Electronic Components Datasheet  

RT9641B Datasheet

Triple Linear Regulator Controller Support ACPI Control Interface

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RT9641A/B
Triple Linear Regulator Controller Support
ACPI Control Interface
General Description
The RT9641A/B, paired with either the RT9230 or
RT9231 simplifies the implementation of ACPI-
compliant designs in microprocessor and computer
applications. The IC integrates two linear controllers
and a low-current pass transistor, as well as the
monitoring and control functions into a 16-pin SOIC
package. One linear controller generates the
3.3VDUAL voltage plane from an ATX power supply's
5VSB output during sleep states (S3,S4/S5),
powering the PCI slots through an external pass
transistor, as instructed by the status of the 3.3VDUAL
enable pin. An additional pass transistor is used to
switch in the ATX 3.3V output for PCI operation
during S0 and S1 (active) operating states. The
second linear controller supplies the computer
system's 2.5V/3.3V memory power through an
external pass transistor in active states. During S3
state, an integrated pass transistor supplies the
2.5V/3.3V sleep-state power. A third controller
powers up a 5VDUAL plane by switching in the ATX
5V output in active states, or the ATX 5VSB in sleep
states.
The RT9641A/B's operating mode (active-state
outputs or sleep-state outputs) is selectable through
two control pins: S3 and S5. Further control of the
logic governing activation of different power modes is
offered through two enabling pins: EN3VDL and
EN5VDL. In active states, the 3.3VDUAL linear
regulator uses an external N-channel pass MOSFET
to connect the output (VOUT1) directly to the 3.3V
input supplied by an ATX (or equivalent) power
supply, while incurring minimal losses. In sleep state,
the 3.3VDUAL output is supplied from the ATX 5VSB
through a NPN transistor, also external to the
controller. Active state power delivery for the
2.5V/3.3V or 2.6V/3.43V VMEM output is done
through an external NPN or a NMOS transistor. In
sleep states, conduction on this output is transferred
to an internal pass transistor. The 5VDUAL output is
powered through two external MOS transistors. In
sleep states, a PMOS (or PNP) transistor conducts
the current from the ATX 5VSB output, while in active
states, current flow is transferred to a NMOS
transistor connected to the ATX 5V output. Similar to
the 3.3VDUAL output, the operation of the 5VDUAL
output is dictated not only by the status of the S3 and
S5 pins, but that of the EN5VDL pin as well.
Features
z Provides 3 ACPI-Controlled Voltages
5V Active/Sleep(5VDUAL)
z 3.3V Active/Sleep(3.3VDUAL)
2.5V/3.3V Active/Sleep(VMEM) with RT9641A
2.6V/3.43V Active and 2.5V/3.3V Sleep(VMEM)
with RT9641B
z Simple Control Design
No Compensation Required
z Excellent Output Voltage Accuracy
3.3VDUALOutput±2.0%Sleep States Only
2.5V/3.3V (2.6V/3.43V) Output±2.0%
Both Operational States
z Fixed Output Voltages Require No Precision
External Resistors
z Small Size
Small External Component Count
z Selectable 2.5V/3.3V (2.6/3.43) VMEM Output
Voltage via FAULT/MSEL Pin
2.5V/2.6V for RDRAM Memory
3.3V/3.43V for SDRAM Memory
z Under-voltage Monitoring of All Outputs with
Centralized FAULT Reporting
z Adjustable Soft-start Function Eliminates 5VSB
Perturbations
DS9641A/B-03 March 2002
www.richtek-ic.com.tw
1


  Richtek Technology Electronic Components Datasheet  

RT9641B Datasheet

Triple Linear Regulator Controller Support ACPI Control Interface

No Preview Available !

RT9641A/B
Ordering Information
RT9641A/B… …
Package type
S2 : SOP-16
Operating temperature range
C: Commercial standard
VMEM voltage
A : 2.5V/3.3V
B : 2.6V/3.43V
Pin Configurations
Part Number
RT9641ACS2
(Plastic SOP-16)
RT9641BCS2
(Plastic SOP-16)
Pin Configurations
TOP VIEW
5VSB
EN3VDL
3V3DLSB
3V3DL
EN5VDL
S3
S5
GND
1
2
3
4
5
6
7
8
16 VSEN2
15 DRV2
14 12V
13 SS
12 5VDL
11 5VDLSB
10 DLA
9 FAULT/MSEL
Function Block Diagram
12V 3V3DLSB
12V BIAS
12V MONITOR
10.5V/9.5V
EA4 _
3V3DL
5VSB
5VSB POR
TO 12V
DLA
5VDL
UV
DETECTOR
40µA +
0.2V _
MEM VOLTAGE
SELECT COMP
UA COMPARTOR
+
_ 3.75V
5µA
MONITOR AND CONTROL
TEMPERATURE
MONITOR
(TMON)
+
_ 1.265V
TO EA2
UV DEECTOR
SS S3 S5 EN5VDL
EN3VDL
GND
5VDLSB
DRV2
VSEN2
www.richtek-ic.com.tw
2
DS9641A/B-03 March 2002


Part Number RT9641B
Description Triple Linear Regulator Controller Support ACPI Control Interface
Maker Richtek
Total Page 14 Pages
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