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IRU3018CW
5 Bit Prog SynchBuck CIC Adj LDO 200mA LDO Regul in a 24-Pin SOIC(WB) package
International
TOR Rectifier
Data Sheet No. PD94144
IRU3018
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC,
LDO CONTROLLER AND 200mA ON-BOARD LDO REGULATOR
FEATU RES
Provides single chip solution for Vcore, GTL+ & clock
supply
200mA On-Board LDO Regulator
Designed to meet the latest Intel specification for
Pentium IITM
DESCRIPTION
The IRU3018 controller IC is specifically designed to meet
Intel specification for Pentium llTM 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
Cl On-Board DAC programs the output voltage from 200mA regulator for clock supply which are required for
1.3V to 3.5V the Pentium II applications. These devices feature a pat-
D 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,
D Loss-less Short Circuit Protection with HICCUP will provide in excess of 18A of output current for an on-
D Synchronous operation allows maximum efficiency board DC-DC converterwhile 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 R)S(0N) of the high-side power
I: Soft-Start MOSFET as the sensing resistor, internal current limit-
D High current totem pole driver for direct driving of the ing for the clock supply, and a Power Good window com-
external power MOSFET parator that switches its open collector output low when
E Power Good Function monitors all outputs any one of the outputs is outside of a pre-programmed
D Over-Voltage Protection circuitry protects the window. Other features of the device are: Under-voltage
switcher output and generates a fault signal lockout for both 5V and 12V supplies, an external pro-
D Thermal Shutdown grammable soft-start function, programming the oscilla-
D 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.
D Total Power Solution for Pentium II processor
application
TYPICAL APPLICATION Note: Pentium II is trademark of Intel Corp
IRU3018 SNTCHER1 -
CONTROL VOL“
3.3V - -
ie L, I
- I LINEAR LINEAR - Vour2
VOUT3 - CONTROL REGULATOR J;
Figure 1 - Typical application of IRU3018.
PACKAGE ORDER INFORMATION
Ta (°C) DEVICE PACKAGE
0 To 70 IRU3018CW 24-Pin Plastic SOIC WB
Rev. 1.6 1
07l16l02
International
TOR Rectifier
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 WI DE BODY PLASTIC SOIC (W)
TOP VIEW
v12 E V 2:4_IUGate1
VID4E EPhase1
vmsE ZlLGate1
VIDZIZ EPGnd
l/IDI E E0locset1
VIDOE Cl/as
PGood IE GlFbl
st 1:7]En
SSE EFbs
Fault / RIE EIGates
m IE EGnd
VN IE Evan
OJA =80°CNV
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specfcations apply over V12=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-5V 0.3 V
Supply Current
Operating Supply Current I12 V12 6 mA
ls V5 20
Switching Controllers; Vcore (Vour1)
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 p.A
Input Offset Voltage -2 +2 mV
Delay to Output VDIFF=10mV 100 ns
Oscillator Section (Internal)
Osc Frequency 200 KHz
2 Rev. 1.6
07I16I02
