RT9241CS ETC, RT9241CS Datasheet

RT9241CS

Manufacturer Part Number

RT9241CS

Description

Two-Phase DC/DC Controller for CPU Core Power Supply

Manufacturer

ETC

Datasheet

1.RT9241CS.pdf (13 pages)

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General Description

The RT9241 is a two-phase buck DC/DC controller

integrated with all control functions for high

performance processor VRM. The RT9241 drives 2

buck switching stages operating in 180 degree

phase shift. The two-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.

RT9241 regulates both easily set voltage and

current loops. Precise current sharing for power

stage is achieved by differential input current sense

and processing circuit. The settings of current

sense, droop tuning and over current protection are

independent to compensation circuit of voltage loop.

The feature greatly facilitates the flexibility of CPU

power supply design and tuning.

The RT9241 uses a 5-bit DAC of 1.1V to 1.85V

(25mV/step)

compensation to meet the strict VRM transient

requirement. The IC monitors the VCORE voltage

for PGOOD and over voltage protection. Soft start,

over current protection and programmable under

voltage lockout are also provided to assure the

safety of microprocessor and power system.

Ordering Information

RT9241

DS9241-00 November 2001

Two-Phase DC/DC Controller for CPU Core Power Supply

Operating temperature range

output

Package Type

S : SOP-20

C: Commercial standard

with

load

current

droop

Preliminary

Features

Applications

Pin Configurations

RT9241CS

(Plastic SOP-20)

Part Number

Two-Phase Power Conversion

VRM 9.0 DAC Output with Active Droop

Compensation for Fast Load Transient

Precise

Differential Sense Input

Hiccup Mode Over Current Protection

Programmable Under Voltage Lockout and

Soft Start

High Ripple Frequency, (Channel Frequency

200KHz) Times Channel Number

Power Supply for Server and Workstation

Power Supply for High Current Microprocessor

Channel

COMP

VID4

VID3

VID2

VID1

VID0

ADJ

DVD

Current

Pin Configurations

TOP VIEW

www.richtek-ic.com.tw

Sharing

RT9241

VSEN

GND

VDD

PGOOD

ISP1

PWM1

PWM2

ISP2

ISN2

ISN1

with

Related parts for RT9241CS

RT9241CS Summary of contents

Page 1

... Programmable Under Voltage Lockout and Soft Start High Ripple Frequency, (Channel Frequency 200KHz) Times Channel Number Applications Power Supply for Server and Workstation Power Supply for High Current Microprocessor Pin Configurations Part Number RT9241CS (Plastic SOP-20) current droop RT9241 Channel Current Sharing Pin Configurations ...

Page 2

RT9241 Absolute Maximum Ratings Supply Voltage Input, Output or I/O Voltage Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Power Dissipation SOP-20 Package Thermal Resistance SOP-20, θ JA Lead Temperature (Soldering, 10 sec.) ...

Page 3

Parameter Protection SS Current Over-Voltage Trip (VSEN/DACOUT) Power Good Upper Threshold (VSEN/DACOUT) Lower Threshold (VSEN/DACOUT) Function Block Diagram DVD Power On Reset VDD PGOOD 120% VDAC VID0 VID1 108% DAC VID2 VDAC VID3 VID4 92% VDAC VSEN ADJ FB GND ...

Page 4

RT9241 VID4 VID3 ...

Page 5

Typical Application Circuit DS9241-00 November 2001 Preliminary RT9241 www.richtek-ic.com.tw 5 ...

Page 6

RT9241 www.richtek-ic.com.tw 6 Preliminary DS9241-00 November 2001 ...

Page 7

Functional Pin Description VID4, VID3, VID2, VID1 and VID0 ( Pin1,2,3,4,5) DAC voltage identification inputs for VRM9.0. These pins are TTL-compatible and internally pulled to VDD if left open. COMP (Pin 6) Output of the error amplifier and input of ...

Page 8

RT9241 Simplified Block Diagram Control Loops for a Two Phase Converter VDAC Droop ADJ Control EA FB GND COMP R LOAD Voltage loop www.richtek-ic.com.tw 8 Preliminary PWMCP Current Balance PWMCP Processor SS Control OUT PWM1 PWM Logic ...

Page 9

Operation RT9241 is a two-phase DC/DC controller that precisely regulates CPU core voltage and balances the current of different power channels. The converter consists of RT9241 and its companion MOSFET driver provide high quality CPU power and all protection function ...

Page 10

RT9241 I × L The sensing circuit gets cancel the voltage drop caused amplifier input bias current. I just before low side MOSFET turns off (See Fig.2). Therefore, ...

Page 11

Two-Phase Converter and Components Function Grouping VID Compensation & Offset Droop Setting 12V Driver Power UVLO DS9241-00 November 2001 Preliminary VCC PVCC RT9600 PWM +5V GND VDD PWM1 ISP1 VCC COMP ISN1 PVCC FB VSEN RT9600 ADJ PWM2 PWM GND ...

Page 12

RT9241 Package Information C Symbol www.richtek-ic.com.tw 12 Preliminary Dimensions In Millimeters Min Max 12.598 13.005 7.391 7.595 2.362 2.642 0.330 0.508 1.194 1.346 0.229 0.330 0.102 ...

Page 13

RICHTEK TECHNOLOGY CORP. Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 DS9241-00 November 2001 Preliminary RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, ...

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