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IRU3007 Datasheet

  • IRU3007

  • 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK, NON-SYNCHRONOUS,ADJUSTA...

  • 17頁

  • IRF

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Data Sheet No. PD94142
IRU3007
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK, NON-SYNCHRO-
NOUS, ADJUSTABLE LDO AND 200mA ON-BOARD LDO
FEATURES
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
200mA On-Board LDO Regulator
Designed to meet Intel VRM 8.2 and 8.3 specifica-
tion for Pentium II鈩?/div>
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 drivers for directly driving
the external Power MOSFETs
Power Good function monitors all outputs
Over-Voltage Protection circuitry protects the
switcher outputs and generates a fault output
Thermal Shutdown
The IRU3007 controller IC is specifically designed to meet
Intel specification for Pentium II鈩?microprocessor ap-
plications as well as the next generation of P6 family
processors. The IRU3007 provides a single chip control-
ler IC for the Vcore, LDO controller for GTL+ and an
internal 200mA regulator for clock supply which are re-
quired for the Pentium II applications. It also contains a
switching controller to convert 5V to 3.3V regulator for
on-board applications that uses either AT type power
supply or is desired not to rely on the ATX power supply鈥檚
3.3V output. These devices feature a patented topology
that in combination 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 IRU3007 also fea-
tures, loss-less current sensing for both switchers by
using the R
DS(on)
of the high-side power MOSFET as the
sensing 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: Under-Voltage Lockout for both
5V and 12V supplies, an external programmable soft-
start function, programming the oscillator frequency via
an external resistor, Over-Voltage Protection (OVP) cir-
cuitry for both switcher outputs and an internal thermal
shutdown.
Note:
Pentium II and Pentium Pro are trademarks of Intel Corp.
APPLICATIONS
Total Power Solution for Pentium II processor
application
TYPICAL APPLICATION
5V
SWITCHER2
CONTROL
V
O U T
2
SWITCHER1
CONTROL
V
O U T
1
IRU3007
V
O U T
3
LINEAR
CONTROL
LINEAR
REGULATOR
V
O U T
4
Figure 1 - Typical application of IRU3007.
PACKAGE ORDER INFORMATION
T
A
(擄C)
0 To 70
Rev. 2.1
08/20/02
DEVICE
IRU3007CW
www.irf.com
PACKAGE
28-pin Plastic SOIC WB (W)
1

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