RICHTEK RT9229CS Datasheet

RT9229

Advanced Dual PWM and Dual Linear Power Controller

General Description

The RT9229 is a 4-in-one power controller optimized

for high-performance microprocessor and computer

applications. The IC integrates two PWM controllers,

a linear regulator and a linear controller as well as

monitoring and protection functions into a 28-pin

SOP package. The first PWM controller regulates the

microprocessor core voltage with a synchronous

buck converter, while the second PWM controller

supplies the 3.3V power with a standard buck

converter. The linear regulator provides power for the

clock driver circuit and the linear controller regulates

power for the GTL bus.

The RT9229 features an Intel-compatible, TTL 5-bit

programmable DAC that adjusts the core voltage

from 2.1V to 3.5V in 0.1V increments and from 1.3V

to 2.05V in 0.05V steps. The second PWM controller

is user-adjustable for output level between 3.0V and

3.5V with ±2.5% accuracy. The 5-bit DAC has a

typical ±1% tolerance. The linear regulator uses an

internal drive device to provide 2.5V ±2.5% output

voltage. The linear controller drives an external N-

channel MOSFET or a low cost NPN bipolar

transistor to provide 1.5V ±2.5%.

Features

4-in-one Regulated Voltages for Microprocessor

Core, I/O, Clock, and GTL

Compatible with HIP6019B

Power-Good Output Voltage Monitor

Switching section

5-bit DAC Programmable from 1.3V to 3.5V

z ±

±1% DAC Accuracy

±±

Fast Transient Response

Full 0% to 100% Duty Cycle Driver

Fixed 200kHz Switching Frequency

Adaptive Non-overlapping Gate Driver

Over-current Monitor Uses MOSFET R

Over-voltage Protection Uses Lower MOSFET

DS(ON)

Linear Section

User-adjustable Linear Regulator Output Voltage

MOSFET or NPN Driving Capability

Ultra Fast Response Speed

Under-voltage Protection

Internal Thermal Shutdown

Applications

Full Motherboard Power Regulation for Computer

Low-voltage Distributed Power Supplies

The RT9229 monitors all the output voltages. A

Power-good signal is issued when the core voltage is

within ±10% of the DAC setting and the other levels

are above their under-voltage levels. Additional build-

in over-voltage protection for the core output uses the

lower MOSFET to prevent output voltage above

115% of the DAC setting. The PWM over-current

function monitors the output current using the voltage

drop across the upper MOSFET’s R

DS(ON)

which

eliminates the need for a current sensing resistor.

Ordering Information

RT9229



Package type

Pin Configurations

Part Number Pin Configurations

RT9229CS

(Plastic SOP-28)

UGATE2 PHASE2

VID4 VID3 VID2 VID1 VID0

PGOOD

OCSET2

FB2

NC2

FAULT

FB4

TOP VIEW

12 17

VCC UGATE1 PHASE1

LGATE1 PGND

OCSET1 VSEN1 FB1 NC1

FB3

GATE3 GND

VOUT4

VSEN2

S : SOP-28

Operating temperature range

C: Commercial standard

DS9229-03 July 2001 www.richtek-ic.com.tw

RT9229

Absolute Maximum Ratings

Supply Voltage

PGOOD, FAULT and GATE Voltage GND−0.3V to VCC+0.3V

Input, Output or I/O Voltage GND−0.3V to 7V

Ambient Temperature Range 0°C to +70°C

Junction Temperature Range 0°C to +125°C

Storage Temperature Range −65°C to +150°C

Lead Temperature (Soldering, 10 sec.) 300°C

Package Thermal Resistance

SOP-28, θ

60°C/W

Recommended Operating Conditions

Supply Voltage

Ambient Temperature Range 0°C to 70°C

Junction Temperature Range 0°C to 125°C

CAUTION:

Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the

device. This is a stress only rating and operation of the device at these or any other conditions above those

indicated in the operational sections of this specification is not implied.

+15V

+12V ±10%

Electrical Characteristics

= 12V, PGND = 0V, TA = 25°C, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Units

VCC Supply Current

Nominal Supply Current

UGATE1, GATE2, GATE3, LGATE1, and VOUT4 Open

Power-on Reset

VCC Rising Threshold

VCC Falling Threshold

Rising V

OCSET1 (and 2)

Threshold

OCSET

= 4.5V

Reference and DAC

DAC (VID0 – VID4) Input Low Voltage -- -- 0.8

DAC (VID0 – VID4) Input High Voltage 2.0 -- --

DACOUT Voltage Accuracy DACOUT = 2.05 ~ 3.50V -1 -- 1

DACOUT Voltage Accuracy DACOUT = 1.30 ~ 2.00V -1% -- 20mV

Reference Voltage (Pin FB2 and FB3)

REF

-- 10 -- mA

7.5 -- 9.5 V

7--9V

-- 1.25 -- V

1.240 1.265 1.290

To be continued

www.richtek-ic.com.tw DS9229-03 July 2001

Oscillator

RT9229

Parameter Symbol Test Conditions Min Typ Max Units

Free Running Frequency 180 200 225

Ramp Amplitude

∆V

OSC

-- 1.9 --

Linear Regulator

Regulation

10mA < I

VOUT2

< 150mA

-2.5 -- 2.5

Under-voltage Level FB4 Rising -- 75 87

Under-voltage Hysteresis -- 100 --

Over-current Protection

Over-current Protection During Startup

OVP

180 230 --

-- 700 --

Linear Controller

Regulation

VSEN3 = GATE3

GATE3

< 20mA

0 < I

-2.5 -- 2.5

Under-voltage Level FB3 Rising -- 75 87

Under-voltage Hysteresis -- 100 --

Output Drive Current

VIN2 – VOUT3 > 1.5V

20 40 --

PWM Controller Error Amplifier

DC Gain -- 65 --

kHz

P-P

PWM Controller Gate Driver

UGATE 1 (and 2) Source

UGATE 1 (and 2) Sink

LGATE Source

LGATE Sink

Protection

Over-voltage Trip

OUT1

Over-voltage Trip

OUT2

FAULT Souring Current

OCSET1 (and 2) Current Source

Soft-start Current

Power Good

Upper Threshold

OUT1

Under Voltage

OUT1

Hysteresis (VSEN1/DACOUT)

OUT1

PGOOD Voltage Low

UGATE

UGATEVUGATE

LGATE1

LGATE1VLGATE1

VCC - V

VCC = 12V, V

VSEN1 Rising 112 115 118

VSEN2 Rising 4.1 4.3 4.5

VCC = 12V

FAULT

OCSET

VSS = 1V

VSEN1 Rising 108 -- 112

VSEN1 Rising 90 -- 94

Upper/Lower Threshold -- 2 --

PGOODIPGOOD

UGATE

= 1V

= 8V

= 4.5V

= -4mA

= 1V

LGATE1

= 2V

-- 3 7

-- 1 --

-- 2 6

10 14 --

170 200 230

-- 11 --

-- -- 0.5

Ω

µA

DS9229-03 July 2001 www.richtek-ic.com.tw

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