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IRU3018
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND 200mA LDO ON-BOARD
International
1:211 fky:ctifia-
Data Sheet No. PD94144
IRU3018
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS
LDO CONTROLLER AND 200mA LDO ON-BOARD
EATURES
Provides single chip solution forVcore, GTL+ & clock
supply
DESCRIPTION
The IRU3018 controller IC is specifically designed to meet
Intel specification for Pentium ||TM microprocessor appli-
I: 200mA On-Board LDO Regulator cations as well as the next generation of P6 family pro-
n Designed to meet the latest Intel specification for cessors. The IRU3018 provides a single chip controller
Pentium ||TM IC forthe Vcore, LDO controller for GTL+ and an internal
n On-Board DAC programs the output voltage from 200mAreguIatorforclock supply which are required for
1.3V to 3.5V the Pentium II applications. These devices feature a pat-
I: Linear regulator controller on board for 1.5V GTL+ ented topology that in combination with a few external
supply components as shown in the typical application circuit,
n Loss-less Short Circuit Protection with HICCUP will provide in excess of 18A of output current for an on-
" Synchronous operation allows maximum efficiency board DC-DC convetterwhile automatically providing the
patented architecture allows fixed frequency opera- right output voltage via the 5-bit internal DAC. The
tion as well as 100% duty cycle during dynamic IRU3018 also features loss-less current sensing for both
load switchers by using the RDS(on) of the high-side power
a Soft-Start MOSFET as the sensing resistor, internal current limit-
I: High current totem pole driver for direct driving of the ing forthe clock supply, and a Power Good window com-
external power MOSFET parator that switches its open collector output low when
l: Power Good Function monitors all outputs any one of the outputs is outside of a pre-programmed
u Over-Voltage Protection circuitry protects the window. Otherfeatures ofthe device are: Under-voltage
switcher output and generates a fault signal lockout for both 5V and 12V supplies, an external pro-
n Thermal Shutdown grammable soft-start function, programming the oscilla-
rl Logic Level Enable Input tor frequency via an external resistor, Over-Voltage Pro-
tection (OVP) circuitry for both switcher outputs and an
APPLICATIONS internal thermal shutdown.
ll Total Power Solution for Pentium II processor
application
TYPICAL APPLICATION Note: Pentium II is trademark of Intel Corp
T IRU3018 SWITCHER1 -
CONTROL Vout1
3.3V i I, l l l]
l LINEAR LINEAR
Vout3 l CONTROL REGULATOR L Vout2
i_-'ii-,
Figure 1 - Typical application of IRU3018.
PACKAGE ORDER INFORMATION
TA (°C) DEVICE
PAC KAGE
0 To 70 IRU3018CW
24-pin Plastic SOIC WB
Rev. 1.5
07/24/01
IRU3018
ABSOLUTE MAXIMUM RATINGS
V5 Supply Voltage _................................................... 7V
V12 Supply Voltage _................................................. 20V
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range .....................
0°C To 125°C
PACKAGE INFORMATION
24-PIN WIDE BODY PLASTIC SOIC (W)
TOP VIEW
v12 E V E UGate1
VID4 E E Phase1
VID3 E E LGate1
VID2 E E PGnd
VID1E EOCSen
VIDOE EVsem
PGood E E Fb1
v5 E E En
ss E E Fb3
Faultl Rt E Eleazes
Fb2 [1:1 Elend
Mn2 E EVoutz
OJA =80°CNV
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply overV12=12V, V5=5V and TA=0 to 70°C. Typical values refer
to TA=25°C. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient
temperature.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Supply UVLO Section
UVLO ThreshoId-12V Supply Ramping Up 10 V
UVLO Hysteresis-12V 0.4 V
UVLO Threshold-W Supply Ramping Up 4.3 V
UVLO Hysteresis-W 0.3 V
Supply Current
Operating Supply Current I12 V12 6
ls V5 20 mA
Switching Controller, Vcore (Vout 1)
VID Section
DAC Output Voltage (Note 1) VDAC 0.99Vs Vs 1.01Vs V
DAC Output Line Regulation 0.1 %
DAC Output Temp Variation 0.5 %
VID Input LO 0.8 V
VID Input HI 2 V
VID Input Internal Pull-Up 27 Kn
Resistor to V5
Error Comparator Section
Input Bias Current 2 WA
Input Offset Voltage -2 +2 mV
Delay to Output Vdiff=10mV 100 ns
Oscillator Section (Internal)
Osc Frequency 200 KHz
Rev. 1.5
07/24/01
