rt9641a ETC-unknow, rt9641a Datasheet

rt9641a

Manufacturer Part Number

rt9641a

Description

Triple Linear Regulator Controller Support

Manufacturer

ETC-unknow

Datasheet

1.RT9641A.pdf (14 pages)

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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 rt9641a

rt9641a 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 control functions into a 16-pin SOIC package. One linear controller 3 ...

Page 2

... DETECTOR 40µ MEM VOLTAGE 0.2V SELECT COMP _ UA COMPARTOR 5VDL _ + 5µA 3.75V _ www.richtek-ic.com.tw 2 Pin Configurations Part Number RT9641ACS2 (Plastic SOP-16) RT9641BCS2 (Plastic SOP-16) 5VSB 3V3DL EA4 _ 5VSB POR MONITOR AND CONTROL UV DEECTOR EN5VDL EN3VDL Pin Configurations TOP VIEW 5VSB ...

Page 3

... EN5VDL = 25°C, unless otherwise specified) A Symbol Test Conditions I 5VSB 0V 5VSB(OFF RT9641A/B +7.0V GND−0.3V to +14.5V GND−0. +0.3V 12V GND−0.3V to 5VSB+0.3V 100°C/W 150°C -65°C to 150°C 300°C +5V ± 5% +12V ± 10 5.5V 0°C to 125°C 0° ...

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 3V3DL Nominal Voltage Level 3V3DL Under-voltage Falling Threshold ...

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 www.richtek-ic.com.tw 5 ...

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 controlled by the IC. The voltage at this pin monitored for power-on reset (POR) purposes ...

Page 7

... S4/S5 states). The 5VSB POR trip event is also used to lock in the memory voltage setting based SEL The RT9641A/B forces the operation mode to start from S4/S5 states at POR releasing. DS9641A/B-03 March 2002 VSEN2 (Pin 16) Connect this pin to the memory output (V sleep states, this pin is regulated to 2.5V(2.6V ...

Page 8

... S0, S1 States(Active) S3 Shutdown In case of a FAULT condition that might endanger the computer system any other time, the RT9641A/B S4/S5 can be shut down by pulling the SS pin below the S0, S1 States(Active) specified shutdown level (typically 0.8V) with an open ...

Page 9

... The output voltage drop during this brief period of time can be approximated with the following formula: tantalum capacitors) ∆V RT9641A/B . Locate the component close shows the connections could represent ...

Page 10

... ESR so that the input voltage does not dip excessively when energy is transferred to the output capacitors. 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 removal of heat ...

Page 11

... C1 10µF C4 1µF 12V 5VSB 3V3DLSB DRV2 2SD1802 3V3DL VSEN2 FAULT/MSEL 2X150 µ F RT9641A/B 5VDLSB DLA S3 S5 5VDL EN5VDL EN3VDL SS GND RT9641A 220µF C5 1µF ER800D CEB603AL Q1 + 2X150µF + C8,9 C10 1 µ F 100 Q4 MMBT2907A R2 Q5 1/2 HUF76113DK8 + C11 C12 150µF 1 µ ...

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 5.791 6.198 0.406 1.270 Dimensions In Inches Min Max ...

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. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw ...

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