IRU3027CWTR datasheet, PDF - EEWORLD Datasheet

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IRU3027CWTR: DescriptionIC CTRL/REG SYNC BUCK 28-SOIC; Categorysemiconductor Power management; File Size66KB，10 Pages; ManufacturerInfineon; Websitehttp://www.infineon.com/

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IRU3027CWTR Overview

IC CTRL/REG SYNC BUCK 28-SOIC

IRU3027CWTR Parametric

Parameter Name	Attribute value
application	Controller, Intel processor
Voltage - input	5V，12V
Number of outputs	4
Voltage - Output	1.08 V ~ 1.85 V
Operating temperature	0°C ~ 70°C
Installation type	surface mount
Package/casing	28-SOIC (0.295", 7.50mm wide)
Supplier device packaging	28-SOIC

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Data Sheet No. PD94146

IRU3027

5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC

WITH TRIPLE LDO CONTROLLER

FEATURES

DESCRIPTION

Designed to meet VRM 9.0 specification for next

generation microprocessors

On-Board 5-Bit DAC programs the output voltage

from 1.075V to 1.850V in 25mV steps

Linear Regulator Controller On-Board for 1.8V

Provides single chip solution for Vcore, GTL+,

AGP bus, and 1.8V

Automatic Voltage Selection for AGP Slot V

DDQ

Supply

Linear Regulator Controller On-Board for 1.5V

GTL+ Supply

Loss-less Short Circuit Protection for all Outputs

Synchronous operation allows maximum effi-

ciency

Patented architecture allows fixed frequency

operation as well as 100% duty cycle during

dynamic load

Minimum Part Count

Soft-Start

High current totem pole driver for direct driving of

the external power MOSFET

Power Good function monitors all outputs

Over-Voltage Protection Circuitry protects the

switcher output and generates a fault output

The IRU3027 controller IC is specifically designed to meet

VRM 9.0 specification for next generation microproces-

sor applications requiring multiple on-board regulators.

The IRU3027 provides a single chip controller IC for the

Vcore, three LDO controllers, one with an automatic se-

lect pin that connects to the Type Detect pin of the AGP

slot for the AGP V

DDQ

supply, one for GTL+ and the other

for the 1.8V chip set regulator as required for the next

generation PC applications. The IRU3027 is designed to

use either bipolar transistors for V

OUT

3(1.5V) and

OUT

4(1.8V). No external resistor divider is necessary

for any of the regulators. The switching regulator fea-

tures a patented topology that in combination with a few

external components as shown in the typical applica-

tion circuit, will provide well in excess of 20A of output

current for an on-board DC-DC converter while automati-

cally providing the right output voltage via the 5-bit inter-

nal DAC. The IRU3027 also features loss-less current

sensing for both switchers by using the R

DS(ON)

of the

high side power MOSFET as the sensing resistor, an

output under-voltage shutdown that detects short circuit

condition for the linear outputs and latches the system

off, and a Power Good window comparator that switches

its open collector output low when any one of the out-

puts is outside of a pre-programmed window.

APPLICATIONS

Total power solution for next generation Intel

processor application

AMD K7 Low Cost Solution

TYPICAL APPLICATION

3.3V

LINEAR

CONTROL

SWITCHER

CONTROL

OUT

IRU3027

LINEAR

CONTROL

OUT

LINEAR

CONTROL

OUT

Figure 1 - Typical application of IRU3027.

PACKAGE ORDER INFORMATION

(8C)

0 To 70

Rev. 1.5

07/17/02

DEVICE

IRU3027CW

www.irf.com

PACKAGE

28-Pin Plastic SOIC WB

IRU3027

PIN#

PIN SYMBOL

PIN DESCRIPTION

This pin provides shutdown for all the regulators. A TTL compatible, logic level high applied

to this pin disables all the outputs and discharges the soft-start capacitor. The SD signal

turns off the synchronous allowing the body diode to conduct and discharge the output

capacitor.

This pin provides the feedback for the AGP linear regulator. The Select pin when con-

nected to the "Type Detect" pin of the AGP slot automatically selects the right voltage for

the AGP V

DDQ

This pin provides automatic voltage selection for the AGP switching regulator. When it is

pulled LO, the voltage is 1.5V and when left open or pulled to HI, the voltage is 3.3V.

This pin provides the soft-start for all the regulators. An internal current source charges an

external capacitor that is connected from this pin to ground which ramps up the outputs of

the regulators, preventing the outputs from overshooting as well as limiting the input cur-

rent. The second function of the Soft-Start cap is to provide long off time (HICCUP) for the

synchronous MOSFET during current limiting.

This pin has dual function. It acts as an output of the over-voltage protection circuitry or it

can be used to program the frequency using an external resistor . When used as a fault

detector, if any of the switcher outputs exceed the OVP trip point, the Fault pin switches

to 12V and the soft-start cap is discharged. If the Fault pin is to be connected to any

external circuitry, it needs to be buffered.

This pin provides the feedback for the linear regulator that its output drive is Drive4.

This pin controls the gate of an external MOSFET for the 1.8V chip set linear regulator.

This pin has no connection.

This pin serves as the ground pin and must be connected directly to the ground plane.

This pin controls the gate of an external transistor for the 1.5V GTL+ linear regulator.

This pin provides the feedback for the linear regulator that its output drive is Drive3.

5V supply voltage. A high frequency capacitor (0.1 to 1mF) must be placed close to this

pin and connected from this pin to the ground plane for noise free operation.

This pin provides the feedback for the synchronous switching regulator. Typically this pin

can be connected directly to the output of the switching regulator. However, a resistor

divider is recommended to be connected from this pin to V

OUT

1 and ground to adjust the

output voltage for any drop in the output voltage that is caused by the trace resistance.

The value of the resistor connected from V

OUT

1 to Fb1 must be less than 1000V.

This pin is internally connected to the under-voltage and over-voltage comparators sens-

ing the Vcore status. It must be connected directly to the Vcore supply.

This pin is connected to the Drain of the power MOSFET of the Core supply and it provides

the positive sensing for the internal current sensing circuitry. An external resistor pro-

grams the current sense threshold depending on the R of the power MOSFET. An

external capacitor is placed in parallel with the programming resistor to provide high fre-

quency noise filtering.

This pin serves as the Power ground pin and must be connected directly to the ground

plane close to the source of the synchronous MOSFET. A high frequency capacitor (typi-

cally 1mF) must be connected from V12 pin to this pin for noise free operation.

Output driver for the synchronous power MOSFET for the Core supply.

This pin is connected to the Source of the power MOSFET for the Core supply and it

provides the negative sensing for the internal current sensing circuitry.

Output driver for the high side power MOSFET for the Core supply.

This pin is connected to the 12V supply and serves as the power Vcc pin for the output

drivers. A high frequency capacitor (typically 1mF) must be placed close to this pin and

PGnd pin and be connected directly from this pin to the ground plane for the noise free

operation.

SEN

Select

Fault / Rt

SEN

Drive4

Gnd

Drive3

SEN

OCSet

PGnd

LGate

Phase

UGate

V12

Rev. 1.5

07/17/02

www.irf.com

IRU3027CWTR Related Products

	IRU3027CWTR	IRU3027CW	IRU3027CWPBF
Description	IC CTRL/REG SYNC BUCK 28-SOIC	IC CTRL/REG SYNC BUCK 28-SOIC	SWITCHING CONTROLLER, 217kHz SWITCHING FREQ-MAX, PDSO28, PLASTIC, SOIC-28
Is it Rohs certified?	-	incompatible	conform to
Maker	-	Infineon	Infineon
package instruction	-	PLASTIC, SOIC-28	SOP,
Reach Compliance Code	-	unknown	compli
ECCN code	-	EAR99	EAR99
Analog Integrated Circuits - Other Types	-	SWITCHING CONTROLLER	SWITCHING CONTROLLER
Control Technology	-	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Nominal input voltage	-	5 V	5 V
JESD-30 code	-	R-PDSO-G28	R-PDSO-G28
JESD-609 code	-	e3	e3
length	-	17.83 mm	17.83 mm
Number of functions	-	1	1
Number of terminals	-	28	28
Maximum operating temperature	-	70 °C	70 °C
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	SOP	SOP
Package shape	-	RECTANGULAR	RECTANGULAR
Package form	-	SMALL OUTLINE	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	-	NOT SPECIFIED	NOT SPECIFIED
Certification status	-	Not Qualified	Not Qualified
Maximum seat height	-	2.64 mm	2.64 mm
surface mount	-	YES	YES
Switch configuration	-	PUSH-PULL	PUSH-PULL
Maximum switching frequency	-	217 kHz	217 kHz
Temperature level	-	COMMERCIAL	COMMERCIAL
Terminal surface	-	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	-	GULL WING	GULL WING
Terminal pitch	-	1.27 mm	1.27 mm
Terminal location	-	DUAL	DUAL
Maximum time at peak reflow temperature	-	NOT SPECIFIED	NOT SPECIFIED
width	-	7.5 mm	7.5 mm

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