IRU3011CWTR ,5 Bit Programmable Synchronous Buck Controller IC in a 20-Pin SOIC(WB) packageAPPLICATIONSfrequency by using an external capacitor.Pentium III & Pentium II
IRU3011CW-IRU3011CWTR
5 Bit Programmable Synchronous Buck Controller IC in a 20-Pin SOIC(WB) package
International
TOR Rectifier
Data Sheet No. PD94143
IRU3011
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK
CONTROLLER IC
FEATURES DESCRIPTION
III Dual Layout compatible with HIP6004A The IRU3011 controller IC is spetyfcally designed to meet
D Designed to meet Intel specification of VRM8.4 for Intel specfcation for latest Pentium lllTu microproces-
Pentium lllTM sor applications as well as the next generation P6 fam-
El On-Board DAC programs the output voltage from ily processors. These products feature a patented topol-
1.3V to 3.5V. The IRU3011 remains on for VID code ogy that in combination with a few external components
of (11111). as shown in the typical application Circuit,will provide in
D Loss-Iess Short Circuit Protection excess of 20A of output current for an on-board DC/DC
D Synchronous operation allows maximum efficiency converter while automatically providing the right output
I: Patented architecture allows fixed frequency voltage via the 5-bit internal DAC. These devices also
operation as well as 100% duty cycle during features, loss less current sensing by using the RDS(ON)
dynamic load of the high side Power MOSFET as the sensing resis-
El Over-Voltage Protection Output tor, a Power Good window comparator that switches its
D Soft-Start open collector output low when the output is outside of a
D High currenttotem pole driver for direct driving of the i10% window and an Over-Voltage Protection output.
external power MOSFET Other features of the device are: Under-voltage lockout
D Power Good Function for both 5V and 12V supplies, an external programmable
APPLICATIONS soft-start function as well as programming the oscillator
frequency by using an external capacitor.
EI Pentium III & Pentium ||TM processor DC to DC
converter application
El Low Cost Pentium with AGP
TYPICAL APPLICATION Note: Pentium II and Pentium III are trade marks of Intel Corp.
5V - - VOUT
4 L1 4 C5 RI “01 0J2 ll, C8 L2 l (1.3V-3.5V)
C1 Clt CST . J t
= R2 R3 R4
12V bl-r-i _ R9
V12 CS+ HDrv NCI CS- LDrv Gnd NC/Sen
NC/Gnd Boot VFB
i: IRU3011 as gas T
=' SS V5/Comp 7
C2 = D4 D3 D2 DI DO Ct/Rt OVP PGd c9 J,
m g l I
V|D3 >— T C7 R6
Mf32 >— 7 PM Good
VID1 = C14
VIDO _ OVP
Figure 1 - Typical application of the |RU3011.
IPACKAGE ORDER INFORMATION
TA (°C) DEVICE PACKAGE VID VOLTAGE RANGE
0 To 70 IRU3011CW 20-Pin Plastic SOIC WB (W) 1.3V to 3.5V
Rev. 1.6 1
08/20/02
IRU3011
International
TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
V5 Supply Voltage ....PPP..._....-..._.
V12 Supply Voltage ..............................
Storage Temperature Range ...................
Operating Junction Temperature Range ..
.................... 7V
.................... 20V
................... -65°C To 150°C
.................... 0°C To 125°C
PACKAGE INFORMATION
20-PIN WIDE BODY PLASTIC SOIC (W)
TOPVIEVV
NCE U EC:
cs+[E EOVP
58% Eva
Do 4 ElLrors,
D1 5 EGnd
D2 6 ENC
03E EHDrv
D4 B ECS»
1/5 9 EPGd
VFB10 ENC
6JA=85°CIW
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications 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
VID Section
DAC Output Voltage (Note 1) 0.99Vs Vs 1.01Vs V
DAC Output Line Regulation 0.1 %
DAC Output Temp Variation 0.5 %
VID Input LO 0.4 V
VID Input HI 2 V
VID Input Internal Pull-Up 27 Kn
Resistor to V5
Power Good Section
Under-Voltage lower trip point Vow Ramping Down 0.89Vs 0.90Vs 0.91Vs V
Under-Voltage upper trip point Vom Ramping Up 0.92Vs V
UV Hysterises 0.015Vs 0.02Vs 0.025Vs V
Over-Voltage upper trip point Vow Ramping Up 1.09Vs 1.10Vs 1.11Vs V
Over-Voltage lower trip point Vom Ramping Down 1.08Vs V
OV Hysteresis 0.015Vs 0.02Vs 0.025Vs V
Power Good Output LO RL=3mA 0.4 V
Power Good Output HI RL=5K Pull-Up to 5V 4.8 V
Soft-Start Section
Soft-Start Current CS+=0V, CS-=5V 10 WA
Rev. 1.6
08/20/02
