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What is US3007CW?

This electronic component, produced by the manufacturer "UNISEM", performs the same function as "5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS NON SYNCHRONOUS / LDO CONTROLLER AND 200MmA LDO ON BOARD".


US3007CW Datasheet PDF - UNISEM

Part Number US3007CW
Description 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS NON SYNCHRONOUS / LDO CONTROLLER AND 200MmA LDO ON BOARD
Manufacturers UNISEM 
Logo UNISEM Logo 


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US3007
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS NON SYN-
CHRONOUS , LDO CONTROLLER AND 200MmA LDO ON BOARD
FEATURES
PRELIMINARY DATASHEET
DESCRIPTION
Provides Single Chip Solution for Vcore,
GTL+ ,Clock Supply & 3.3V Switcher on board
Second Switcher Provides Simple Control for
the On board 3.3V supply
200 mA On board LDO regulator
Designed to meet Intel VRM 8.2 and 8.3
specification for Pentium II
On board DAC programs the output voltage
from 1.3V to 3.5V
Linear regulator controller on board for 1.5V
GTL+ supply
Loss less Short Circuit Protection
Synchronous operation allows maximum
efficiency
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
OVP Circuitry Protects the Switcher Outputs
and generates a Fault output
Thermal Shutdown
APPLICATIONS
Total Power Soloution for Pentium II processor
application
The US3007 controller IC is specifically designed to meet
Intel specification for Pentium IImicroprocessor ap-
plications as well as the next generation of P6 family
processors. The US3007 provides a single chip con-
troller IC for the Vcore , LDO controller for GTL+
and an internal 200mA regulator for clock supply
which are required for the Pentium II applications.
It also contains a switching controller to convert 5V
to 3.3V regulator for an on board applications that
either uses AT type power supply or it is desired
not to rely on the ATX power supply’s 3.3V output.
These devices feature a patented topology that in com-
bination with a few external components as shown in
the typical application circuit ,will provide in excess of
14A of output current for an on- board DC/DC converter
while automatically providing the right output voltage via
the 5 bit internal DAC .The US3007 also features, loss
less current sensing for both switchers by using the
Rds-on of the high side Power MOSFET as the sens-
ing resistor, internal current limiting for the clock
supply, 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. Other fea-
tures of the device are ; Undervoltage lockout for both
5V and 12V supplies, an external programmable soft
start function , programming the oscillator frequency via
an external resistor, OVP circuitry for both switcher out-
puts and an internal thermal shutdown.
TYPICAL APPLICATION
5V
Vout2
SWITCHER2
CONTROL
US3007
SWITCHER1
CONTROL
Vout1
Vout3
LINEAR
CONTROL
LINEAR
REGULATOR
3007app3-1.0
Vout4
Notes: Pentium II and Pentium Pro are
trade marks of Intel Corp.
PACKAGE ORDER INFORMATION
Ta (°C)
0 TO 70
Device
US3007CW
Rev. 1.8
12/8/00
Package
28 pin Plastic SOIC WB
4-1

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US3007CW equivalent
US3007
PIN# PIN SYMBOL Pin Description
22 VSEN1
10 FB2
15 VSEN2
23 OCSET1
26 PHASE1
9 OCSET2
2 PHASE2
12 SS
13 FAULT/Rt
18 GATE3
19 FB3
16 VOUT4
14 FB4
17 GND
24 PGND
25 LGATE1
27 UGATE1
1 UGATE2
28 V12
11 V5
20 N.C
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 non-synchronous switching regulator. A resistor
divider is connected from this pin to vout2 and GND that sets the output voltage. The
value of the resistor connected from Vout2 to FB2 must be less than 100.
This pin is connected to the output of the I/O switching regulator. It is an input that
provides sensing for the Under/Over voltage circuitry for the I/O supply as well as the
power for the internal LDO 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 is connected to the Drain of the power MOSFET of the I/O supply and it provides
the positive sensing for the internal current sensing circuitry. An external resistor pro-
grams 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 I/O supply and it
provides the negative sensing for the internal current sensing circuitry.
This pin provides the soft start for the 2 switching regulators. An internal resistor charges
an external capacitor that is connected from 5V supply to this pin which ramps up the
outputs of the switching 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 as shown in the application circuit.
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 GATE3.
This pin is the output of the internal LDO regulator.
This pin provides the feedback for the internal LDO regulator that its output is Vout4.
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.
Output driver for the high side power MOSFET for the I/O 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.
No connect
Rev. 1.8
12/8/00
4-5


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US3007CWThe function is 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS NON SYNCHRONOUS / LDO CONTROLLER AND 200MmA LDO ON BOARD. UNISEMUNISEM

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