rt9246a Richtek Technology Corporation, rt9246a Datasheet

rt9246a

Manufacturer Part Number

rt9246a

Description

Multi-phase Controller Core Power Supply

Manufacturer

Richtek Technology Corporation

Datasheet

1.RT9246A.pdf (16 pages)

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Meier Automation Equipment Co., Limited

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RT9246A

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rt9246aPC

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Multi-Phase PWM Controller for CPU Core Power Supply

General Description

The RT9246A is a multi-phase buck DC/DC controller

integrated with all control functions for GHz CPU VRM.

The RT9246A

operating in interleaved phase set automatically. The multi-

phase architecture provides high output current while

maintaining low power dissipation on power devices and

low stress on input and output capacitors. The high

equivalent operating frequency also reduces the

component dimension and the output voltage ripple in load

transient.

RT9246A controls both voltage and current loops to achieve

good regulation, response & power stage thermal balance.

Precise current loop using Inductor DCR as sense

component builds precise load line for strict VRM DC &

transient specification and also ensures thermal balance

of different power stages. The settings of current sense,

droop

are independent to compensation circuit of voltage loop.

The feature greatly facilitates the flexibility of CPU power

supply design and tuning.

The DAC output of RT9246A supports K8 CPU by 5-bit

VID input, precise initial value & smooth V

at VID jump. The IC monitors the V

and over-voltage protection. Soft-start,

protection and programmable under-voltage lockout are

also provided to assure the safety of microprocessor and

power system.

Ordering Information

Note :

RichTek

DS9246A-04 March 2007

RT9246A

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.

tuning, V

Pb-free and Green

CORE

controls 2 or 3 buck

Package Type

C : TSSOP-28

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

initial offset and over current protection

cial Standard)

products are :

CORE

voltage for PGOOD

switching stages

CORE

over-current

transient

Features

Applications

Pin Configurations

Regulator

Soft-Start

Multi-Phase Power Conversion with Automatic

Phase Selection

K8 DAC Output with Active Droop Compensation

for Fast Load Transient

Smooth V

Power Stage Thermal Balance by Inductor DCR

Current Sense

Hiccup Mode Over-Current Protection

Programmable Switching Frequency (50kHz to

400kHz per Phase), Under-Voltage Lockout and

High Ripple Frequency Times Channel Number

RoHS Compliant and 100% Lead (Pb)-Free

AMD

Low Output Voltage, High Current DC-DC Converters

Voltage Regulator Modules

Athlon

PGOOD

FBRTN

COMP

VOSS

VID4

VID3

VID2

VID1

VID0

CORE

DVD

Transition at VID Jump

64 and Opteron

(TOP VIEW)

TSSOP-28

Processors Voltage

RT9246A

VCC

PWM1

PWM2

PWM3

ISP1

ISP2

ISP3

GND

ADJ

IOUT

ICOMMON

IMAX

www.richtek.com

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