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IRU3018 Datasheet

  • IRU3018

  • 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND ...

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Data Sheet No. PD94144
IRU3018
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS
LDO CONTROLLER AND 200mA LDO ON-BOARD
FEATURES
DESCRIPTION
Provides single chip solution for Vcore, GTL+ & clock
supply
200mA On-Board LDO Regulator
Designed to meet the latest Intel specification for
Pentium II錚?/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 with HICCUP
Synchronous operation allows maximum efficiency
patented architecture allows fixed frequency opera-
tion 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
Over-Voltage Protection circuitry protects the
switcher output and generates a fault signal
Thermal Shutdown
Logic Level Enable Input
The IRU3018 controller IC is specifically designed to meet
Intel specification for Pentium II錚?microprocessor appli-
cations as well as the next generation of P6 family pro-
cessors. The IRU3018 provides a single chip controller
IC for the Vcore, LDO controller for GTL+ and an internal
200mA regulator for clock supply which are required for
the Pentium II applications. These devices feature a pat-
ented topology that in combination with a few external
components as shown in the typical application circuit,
will provide in excess of 18A of output current for an on-
board DC-DC converter while automatically providing the
right output voltage via the 5-bit internal DAC. The
IRU3018 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, internal current limit-
ing for the clock supply, and a Power Good window com-
parator that switches its open collector output low when
any one of the outputs is outside of a pre-programmed
window. Other features of the device are: Under-voltage
lockout for both 5V and 12V supplies, an external pro-
grammable soft-start function, programming the oscilla-
tor frequency via an external resistor, Over-Voltage Pro-
tection (OVP) circuitry for both switcher outputs and an
internal thermal shutdown.
APPLICATIONS
Total Power Solution for Pentium II processor
application
TYPICAL APPLICATION
5V
Note:
Pentium II is trademark of Intel Corp
IRU3018
SWITCHER1
CONTROL
Vout1
3.3V
LINEAR
CONTROL
LINEAR
REGULATOR
3018app3-1.1
Vout2
Vout3
Figure 1 - Typical application of IRU3018.
PACKAGE ORDER INFORMATION
T
A
(!C)
0 To 70
Rev. 1.5
07/24/01
DEVICE
IRU3018CW
PACKAGE
24-pin Plastic SOIC WB
1

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