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PDF IRU3027 Data sheet ( Hoja de datos )
| Número de pieza | IRU3027 | |
| Descripción | 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH TRIPLE LDO CONTROLLER | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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Data Sheet No. PD94146
IRU3027
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC
WITH TRIPLE LDO CONTROLLER
FEATURES
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 VDDQ
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
APPLICATIONS
Total power solution for next generation Intel
processor application
AMD K7 Low Cost Solution
DESCRIPTION
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 VDDQ 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 VOUT3(1.5V) and
VOUT4(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 RDS(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.
TYPICAL APPLICATION
5V
3.3V
LINEAR
CONTROL
VOUT2
IRU3027
SWITCHER
CONTROL
VOUT1
VOUT3
LINEAR
CONTROL
LINEAR
CONTROL
Figure 1 - Typical application of IRU3027.
VOUT4
PACKAGE ORDER INFORMATION
TA (8C)
0 To 70
DEVICE
IRU3027CW
PACKAGE
28-Pin Plastic SOIC WB
Rev. 1.5
07/17/02
www.irf.com
1
1 page  
IRU3027
PIN#
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
PIN SYMBOL
SD
VSEN2
Select
SS
Fault / Rt
VSEN4
Drive4
NC
Gnd
Drive3
VSEN3
V5
Fb
VSEN1
OCSet
PGnd
LGate
Phase
UGate
V12
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 VDDQ.
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 VOUT1 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 VOUT1 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 RDS 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.
Rev. 1.5
07/17/02
www.irf.com
5
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