RT9641AGS RICHTEK [Richtek Technology Corporation], RT9641AGS Datasheet

RT9641AGS

Manufacturer Part Number

RT9641AGS

Description

Triple Linear Regulator Controller Support ACPI Control Interface

Manufacturer

RICHTEK [Richtek Technology Corporation]

Datasheet

1.RT9641AGS.pdf (11 pages)

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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 3.3V

5VSB output during sleep states (S3,S4/S5), powering

the PCI slots through an external pass transistor, as

instructed by the status of the 3.3V

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

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

3.3V

MOSFET to connect the output (V

3.3V input supplied by an ATX (or equivalent) power supply,

while incurring minimal losses. In sleep state, the 3.3V

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 V

done through an external NPN or a NMOS transistor. In

sleep states, conduction on this output is transferred to

an internal pass transistor. The 5V

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 3.3V

of the 5V

the S3 and S5 pins, but that of the EN5VDL pin as well.

DS9641A/B-11 March 2007

DUAL

plane by switching in the ATX 5V output in active

DUAL

linear regulator uses an external N-channel pass

voltage plane from an ATX power supply's

output is dictated not only by the status of

DUAL

output, the operation

OUT1

DUAL

output is powered

) directly to the

enable pin. An

MEM

output is

DUAL

Features

Ordering Information

Note :

RichTek Pb-free and Green products are :

RT9641A/B

Provides 3 ACPI-Controlled Voltages

RT9641B

Simple Control Design

Excellent Output Voltage Accuracy

Operational States

Fixed Output Voltages Require No Precision

External Resistors

Small Size

Selectable 2.5V/3.3V (2.6/3.43) V

via FAULT/MSEL Pin

Under-Voltage Monitoring of All Outputs with

Centralized FAULT Reporting

Adjustable Soft-start Function Eliminates

5VSB Perturbations

RoHS Compliant and 100% Lead (Pb)-Free

RoHS compliant and compatible with the current require-

Suitable for use in SnPb or Pb-free soldering processes.

100%matte tin (Sn) plating.

ments of IPC/JEDEC J-STD-020.

5V Active/Sleep(5V

3.3V Active/Sleep(3.3V

2.5V/3.3V Active/Sleep(V

2V/3.43V Active and 2.5V/3.3V Sleep(V

No Compensation Required

3.3V

Small External Component Count

2.5V/2.6V for RDRAM Memory

3.3V/3.43V for SDRAM Memory

2.5V/3.3V (2.6V/3.43V) Output :

DUAL

Output :

Package Type

S : SOP-16

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

A : 2.5V/3.3V

B : 2.6V/3.43V

MEM

± ± ± ± ±

cial Standard)

DUAL

2.0% ; Sleep States Only

Voltage

DUAL

)

MEM

RT9641A/B

)

) with RT9641A

(MEM)

www.richtek.com

Output Voltage

± ± ± ± ±

2.0% ; Both

MEM

) with

Related parts for RT9641AGS

RT9641AGS Summary of contents

Page 1

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 ...

Page 2

RT9641A/B Pin Configurations (T0P VIEW) 5VSB EN3VDL 3 14 3V3DLSB 4 13 3V3DL 5 12 EN5VDL GND SOP-16 Typical Application Circuit +5V IN +12V IN +3.3V IN +5V SB ...

Page 3

Function Block Diagram 12V 12V Bias 12V Monitor 10.5V/9.5V FAULT/MSEL Detector + 40uA 5VDL + Simplified Power System Diagram 5V IN 12V 3.3V IN 3.3V DUAL FAULT SHUTDOWN S3 S5 EN5VLD EN3VDL DS9641A/B-11 March ...

Page 4

RT9641A/B Absolute Maximum Ratings Supply Voltage (V ) -------------------------------------------------------------------------------------- +7.0V 5VSB 12V -------------------------------------------------------------------------------------------------------------- GND−0.3V to +14.5V DLA, DRV2 ----------------------------------------------------------------------------------------------------- GND−0. All Other Pins ------------------------------------------------------------------------------------------------- GND−0.3V to 5VSB+0.3V Package Thermal Resistance SOP-16, θ --------------------------------------------------------------------------------------------------- 100°C/W JA Maximum Junction Temperature ...

Page 5

Parameter 2.5V/3.3V (2.6V/3.43V) Linear Regulator (V Regulation VSEN2 Nominal Voltage Level VSEN2 Nominal Voltage Level VSEN2 Under-voltage Falling Threshold VSEN2 Under-voltage Hysteresis VSEN2 Output Current DRV2 Output Drive Current DRV2 Output Impedance 3.3V Dual Linear Regulator (V Sleep-mode Regulation 3V3DL ...

Page 6

RT9641A/B Functional Pin Description 5VSB (Pin 1) Provide a 5V bias supply for the IC to this pin by connecting it to the ATX 5VSB output. This pin also provides the base bias current for all the external NPN transistors ...

Page 7

N-MOS transistor or the base of a suitable NPN transistor. VSEN2 (Pin 16) Connect this pin to the memory output (V states, this pin is regulated to 2.5V(2.6V) or 3.3V(3.43V) (based on ...

Page 8

RT9641A/B Table 3. 2.5V/3.3V(2.6V/3.43V) VMEM Output (V Truth Table RSEL S5 S3 2.5V/3.3V 1kΩ 2.5V/2.6V S0, S1 States(Active) 1kΩ 2.5V S3 1kΩ Note Maintains Previous State 1KΩ S4/S5 10kΩ ...

Page 9

IN + 12V 12V 5VSB 5VDLSB 5VDL Q2 C HF1 3V3DLSB V OUT1 3V3DL DLA RT9641A/B C BULK1 VSEN2 Q3 DRV2 GND +3.3V IN ISLAND ON POWAR PLANE LAYER ISLAND ON CIRCUIT/POWER PLANE LAYER ...

Page 10

RT9641A/B Transistor Selection/Considerations The RT9641A/B typically requires one P-channel or PNP transistor and two N-Channel power MOSFETs and two bipolar NPN transistors. One general requirement for selection of transistors for all the linear regulators/switching elements is package selection for efficient ...

Page 11

Outline Dimension J I Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 DS9641A/B-11 March 2007 ...

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