Document
Data Sheet No. PD94249
IRU3013
VRM 8.5 COMPATIBLE 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH TRIPLE LDO CONTROLLER
FEATURES
Meets Latest VRM 8.5 Specification Provides Single Chip Solution for Vcore, 1.2V AGTL+, 1.8V and VDDQ On-Board 5-Bit DAC and Decoder programs the output voltage from 1.050V to 1.825V Loss-less Short Circuit Protection Synchronous operation allows maximum efficiency Patented architecture allows fixed frequency operation as well as 100% duty cycle when operating with a changing load Minimum Part Count, No External Compensation Soft-Start High current totem pole driver for directly driving an external Power MOSFET Power Good Function
APPLICATIONS
Pentium III with VRM 8.5 Specification DC to DC Converters
DESCRIPTION
The IRU3013 controller IC is specifically designed for Intel Pentium III™ microprocessor applications as described in the VRM 8.5 specification. The IC provides a single chip solution for the Vcore, 1.2V AGTL+, 1.8V and a third uncommitted LDO controller that can be used either as 1.2V power good detector or to provide 1.5V AGP bus in applications that this voltage is required. The IRU3013 features a patented topology that, in combination with a few external components, (*Note: See application current in Figure 3) will provide in excess of 30A of output current for an onboard Vcore synchronous converter while automatically providing the output voltage specified in VRM 8.5 specification. The IRU3013 also features, loss-less current sensing by using the RDS(ON) of the high side Power MOSFET as the sensing resistor, a Power Good window comparator that switches its open collector output low when the output is outside of a ±10% window. Other features of the device are: Under-voltage lockout for both 5V and 12V supplies, an external programmable softstart function, and the ability to program the oscillator frequency by connecting an external capacitor.
TYPICAL APPLICATION
VRM 8.5 VID
5V
3.3V VOUT2
LINEAR CONTROL
IRU3013
SWITCHER CONTROL
VOUT1
VOUT3
LINEAR CONTROL
LINEAR CONTROL
VOUT4
Figure 1 - Typical application of IRU3013.
Note: Pentium III is trade mark of Intel Corp.
PACKAGE ORDER INFORMATION
TA (°C) 0 To 70 0 To 70
DEVICE IRU3013CQ IRU3013CW
PACKAGE 24-Pin Plastic QSOP NB (Q) 24-Pin Plastic SOIC WB (W)
Rev. 1.4 08/20/02
www.irf.com
1
IRU3013
ABSOLUTE MAXIMUM RATINGS
V5 Supply Voltage .................................................... 10V V12 Supply Voltage .................................................. 20V All Other Pins .......................................................... 7V Storage Temperature Range ...................................... -65°C To 150°C Operating Junction Temperature Range ..................... 0°C To 125°C
PACKAGE INFORMATION
24-PIN PLASTIC QSOP (Q)
24-PIN WIDE BODY PLASTIC SOIC (W)
Ct 1 Lin1 2 VFB1 3 VFB2 4
V5 5 OVP 6 PGd 7 CS- 8 CS+ 9 HDrv 10 PGnd 11 Gnd 12
24 Lin2 23 D0 22 D1 21 D2 20 D3 19 D25 18 VFB 3 17 SS 16 Lin4 15 VFB4 14 V12 13 LDrv
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