RT9641AC32 RICHTEK [Richtek Technology Corporation], RT9641AC32 Datasheet

RT9641AC32

Manufacturer Part Number

RT9641AC32

Description

TRIPLE LINEAR REGULATOR CONTROLLER SUPPORT

Manufacturer

RICHTEK [Richtek Technology Corporation]

Datasheet

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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.

3.3V

5VSB

powering the PCI slots through an external pass

transistor, as instructed by the status of the 3.3V

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 5V

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 3.3V

regulator uses an external N-channel pass MOSFET

to connect the output (V

input supplied by an ATX (or equivalent) power

supply, while incurring minimal losses. In sleep state,

the 3.3V

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

through an external NPN or a NMOS transistor. In

sleep states, conduction on this output is transferred

to an internal pass transistor. The 5V

DS9641A/B-03 March 2002

DUAL

output

DUAL

voltage plane from an ATX power supply's

One

output is supplied from the ATX 5VSB

DUAL

during

linear

plane by switching in the ATX

sleep

controller

OUT1

MEM

) directly to the 3.3V

states

Triple Linear Regulator Controller Support

output is done

DUAL

generates

DUAL

(S3,S4/S5),

output is

linear

DUAL

the

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 3.3V

output is dictated not only by the status of the S3 and

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

Features

Provides 3 ACPI-Controlled Voltages

3.3V Active/Sleep(3.3V

Simple Control Design

Excellent Output Voltage Accuracy

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

Under-voltage Monitoring of All Outputs with

Adjustable Soft-start Function Eliminates 5VSB

− 5V Active/Sleep(5V

− 2.5V/3.3V Active/Sleep(V

− 2.6V/3.43V Active and 2.5V/3.3V Sleep(V

− No Compensation Required

− 3.3V

− 2.5V/3.3V (2.6V/3.43V) Output：：：： ± ± ± ± 2.0%；；；；

Fixed Output Voltages Require No Precision

Small Size

− Small External Component Count

Voltage via FAULT/MSEL Pin

− 2.5V/2.6V for RDRAM Memory

− 3.3V/3.43V for SDRAM Memory

Centralized FAULT Reporting

Perturbations

External Resistors

with RT9641B

Both Operational States

DUAL

ACPI Control Interface

DUAL

Output：：：： ± ± ± ± 2.0%；；；； Sleep States Only

output, the operation of the 5V

DUAL

RT9641A/B

)

MEM

www.richtek-ic.com.tw

) with RT9641A

MEM

Output

DUAL

MEM

)

Related parts for RT9641AC32

RT9641AC32 Summary of contents

Page 1

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 ...

Page 2

RT9641A/B Ordering Information RT9641A/B Package type S2 : SOP-16 Operating temperature range C: Commercial standard V voltage MEM A : 2.5V/3. 2.6V/3.43V Function Block Diagram 12V 3V3DLSB 12V BIAS 12V MONITOR 10.5V/9.5V UV DETECTOR 40µ MEM ...

Page 3

Absolute Maximum Ratings Supply Voltage (V ) 5VSB 12V DLA, DRV2 All Other Pins Package Thermal Resistance SOP-16, θ JA Maximum Junction Temperature Maximum Storage Temperature Range Maximum Lead Temperature (Soldering, 10 sec.) Recommended Operating Conditions Supply Voltage (V ) ...

Page 4

RT9641A/B 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 ...

Page 5

Simplified Power System Diagram 5V IN 12V 3. 3.3V DUAL FAULT SHUTDOWN S3 S5 EN5VDL EN3VDL DS9641A/B-03 March 2002 Q1 Linear Controller Linear RT9641A/B Controller Control Logic RT9641A/B V MEM DUAL ...

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

Connect this pin to the ATX (or equivalent) 12V output. This pin is used to monitor the status of the power supply as well as provide bias for the NMOS- compatible output drivers. 12V presence at the ...

Page 8

RT9641A/B Table 2. 5VDUAL Output (V OUT3 EN5VDL S5 S3 5VDL Note Maintains Previous State ...

Page 9

The power components (pass transistors) and the controller IC should be placed first. The controller should be placed in a central position on the motherboard, closer to the memory load if possible. Ensure the VSEN2 connection is properly sized to ...

Page 10

RT9641A/B ∆V : output voltage drop OUT ESR : output capacitor bank ESR OUT I : output current during transition OUT C : output capacitor bank capacitance OUT t : active-to-sleep or sleep-to-active transition time t (5µS typical) Since the ...

Page 11

Typical Application Circuit +5V IN +12V IN +3. 1µF Q2 2SD1802 Q3 1/2 UF76113DK8 V OUT1 3. DUAL C7 1 µ F 200µ EN5VDL EN3VDL SHUTDOWN (From Open-drain N-MOS) C13 ...

Page 12

RT9641A/B Package Information C Symbol www.richtek-ic.com. Dimensions In Millimeters Min Max 9.804 10.008 3.810 3.988 1.346 1.753 0.330 0.508 1.194 1.346 0.178 0.254 0.102 0.254 ...

Page 13

DS9641A/B-03 March 2002 RT9641A/B www.richtek-ic.com.tw 13 ...

Page 14

RT9641A/B RICHTEK TECHNOLOGY CORP. Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 www.richtek-ic.com.tw 14 RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. ...

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