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PDF US3022CW Data sheet ( Hoja de datos )

Número de pieza US3022CW
Descripción 4 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS FOUR LDO CONTROLLER
Fabricantes UNISEM 
Logotipo UNISEM Logotipo



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US3022
4 BIT PROGRAMMABLE SYNCHRONOUS BUCK
FEATURES
Provides Single Chip Solution for Vcore,
GTL+ ,AGP Bus, 1.8V , 2.5V
Automatic Voltage Selection for AGP slot's
Vddq supply
4 Linear regulator controller on board to
achieve lowest system cost solution
Standby Vref provides reference for the ACPI
regulators
Designed to meet Intel Latest VRM specifica-
tion for next generation micrprocessors
On board DAC programs the output voltage
from 1.3V to 2.05V
On board resistor dividers provides lowest
component count
Loss less Short Circuit Protection for all
outputs
Synchronous operation allows maximum
efficiency
Patented architecture allows fixed frequency
operation as well as 100% duty cycle during
dynamic load
Soft Start
High current totem pole driver for direct
driving of the external Power MOSFET
Power Good function Monitors all Outputs
OVP Circuitry Protects the Switcher Output
and generates a Fault output
APPLICATIONS
Total Power Soloution for Next Generation Intel
Processor application
PLUS FOUR LDO CONTROLLER
PRELIMINARY DATASHEET
DESCRIPTION
The US3022 is the first controller IC with five controller in
one package specifically designed to meet Intel specifi-
cation for next generation microprocessor applications
requiring multiple on board regulators . The US3022 pro-
vides a single chip controller IC for the Vcore , 4
LDO controllers, one with the automatic select pin
that connects to the TYPE DETECT pin of the AGP
slot for the AGP Vddq supply, one for GTL+ , the
other for the 1.8V chip set regulator as well as 2.5V
for the clock as required for the next generation
PC applications. The US3022 typically uses Bipolar
transistors for Vout3(1.5V) and Vout4(1.8V) and Vout5
however if Vaux pin is connected to 12V, then
MOSFETs can also be used as external pass ele-
ments. No external resistor divider is necessary for
any of the regulators. The switching regulator feature
a patented topology that in combination with a few ex-
ternal components as shown in the typical application
circuit ,will provide well in excess of 20A of output cur-
rent for an on- board DC/DC converter while automati-
cally providing the right output voltage via the 5 bit inter-
nal DAC .The US3022 also features, loss less current
sensing for both switcher by using the Rds-on of
the high side Power MOSFET as the sensing resis-
tor, 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 outputs is outside of a pre pro-
grammed window.
TYPICAL APPLICATION
5V
3.3V
Vout2
LINEAR
CONTROL
US3022
SWITCHER
CONTROL
Vout1
Vout3
LINEAR
CONTROL
LINEAR
CONTROL
LINEAR
CONTROL
Vout5
3022app3-1.0
Vout4
PACKAGE ORDER INFORMATION
Ta (°C)
0 TO 70
Device
US3022CW
Rev. 1.0
11/2/99
Package
28 pin Plastic SOIC WB
4-1

1 page




US3022CW pdf
US3022
PIN# PIN SYMBOL
22 Vsen1
9 Vsen2
15 Drive4
23 OCSET
26 PHASE
12 SS
13 FAULT/Rt
18 Drive3
19 Vsen3
16 Vaux
14 Vsen4
17 GND
24 PGND
25 LGATE
27 UGATE
28 V12
20 V5
11 Select
2 Vsen5
Pin Description
This pin is internally connected to the undervoltage and overvoltage comparators sensing
the Vcore status. It must be connected directly to the Vcore supply.
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 controls the gate of an external MOSFET for the 1.8V chip set linear regulator.
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 resis-
tor programs the C.S threshold depending on the Rds of the power MOSFET. An external
capacitor is placed in parallel with the programming resistor to provide high frequency
noise filtering.
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.
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 GND which ramps up the outputs
of the regulators, preventing the outputs from overshooting as well as limiting the input
current. 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 OVP 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 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.
This pin is normally connected to 3.3V or 5V input. When connected to the 12V supply,
it provides gate drive voltage for the # 3, #4 and #5 (Drive 3,4,5) linear regulator's pass
transistors in case MOSFET transistors are being used instead of Bipolars.
This pin provides the feedback for the linear regulator that its output drive is Drive4.
This pin serves as the ground pin and must be connected directly to the ground plane.
This pin serves as the Power ground pin and must be connected directly to the GND
plane close to the source of the synchronous MOSFET. A high frequency capacitor
(typically 1 uF) must be connected from V12 pin to this pin for noise free operation.
Output driver for the synchronous power MOSFET for the Core supply.
Output driver for the high side power MOSFET for the Core supply.
This pin is connected to the 12 V supply and serves as the power Vcc pin for the output
drivers. A high frequency capacitor (typically 1 uF) must be placed close to this pin and
PGND pin and be connected directly from this pin to the GND plane for the noise free
operation.
5V supply voltage. A high frequency capacitor (0.1 to 1 uF) must be placed close to this
pin and connected from this pin to the GND plane for noise free operation.
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 feedback for the linear regulator that its output drive is Drive5.
Rev. 1.0
11/2/99
4-5

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