RT9641B Richtek Technology Corporation, RT9641B Datasheet

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RT9641B

Manufacturer Part Number
RT9641B
Description
Manufacturer
Richtek Technology Corporation
Datasheet

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Part Number
Manufacturer
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Price
Part Number:
RT9641B
Manufacturer:
RICHTEK
Quantity:
1 583
Part Number:
RT9641BCS
Manufacturer:
RICHTEK/立锜
Quantity:
20 000
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
5V
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-03 August 2003
DUAL
DUAL
plane by switching in the ATX 5V output in active
DUAL
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
DUAL
Triple Linear Regulator Controller Support
output, the operation
OUT1
DUAL
output is powered
) directly to the
enable pin. An
MEM
output is
DUAL
1
Features
Ordering Information
RT9641A/B
Provides 3 ACPI-Controlled Voltages
Simple Control Design
Excellent Output Voltage Accuracy
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
5VSBPerturbations
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 :
RT9641B
Operational States
DUAL
ACPI Control Interface
Output : ±2.0% ; Sleep States Only
Operating Temperature Range
C : Commercial Standard
V
A : 2.5V/3.3V
B : 2.6V/3.43V
Package Type
S : SOP-16
MEM
DUAL
Voltage
DUAL
)
MEM
RT9641A/B
)
) with RT9641A
MEM
Output Voltage
2.0% ; Both
MEM
) with

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RT9641B Summary of contents

Page 1

... ACPI Control Interface 5V Active/Sleep(5V ) DUAL 3.3V Active/Sleep(3.3V ) DUAL 2.5V/3.3V Active/Sleep(V ) with RT9641A MEM 2V/3.43V Active and 2.5V/3.3V Sleep(V RT9641B No Compensation Required 3.3V Output : ±2.0% ; Sleep States Only DUAL 2.5V/3.3V (2.6V/3.43V) Output : Operational States Small External Component Count 2.5V/2.6V for RDRAM Memory 3.3V/3.43V for SDRAM Memory Package Type ...

Page 2

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

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 3V3DLSB 3V3DL EA4 - + UV ...

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, ---------------------------------------------------------------------------------------------------- 100° C/W JA ...

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

VSEN2 (Pin 16) Connect this pin to the memory output ( through an internal pass transistor capable of delivering 300mA (Typically). The active-state voltage at this pin is SEL regulated through an external NPN or NMOS transistor ...

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 1kΩ 2.5V 1kΩ Note 1KΩ 10kΩ 3.3V/3.43V 10kΩ 3.3V 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 capacitors. 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 ...

Page 11

Outline Dimension J I Symbol RICHTEK TECHNOLOGY CORP. Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Dimensions In Millimeters ...

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