IR3523 Datasheet, PDF (1/37 Pages) International Rectifier – XPHASE3TM DUAL OUTPUT CONTROL IC

IR3523
DATASHEET
XPHASE3^TM DUAL OUTPUT CONTROL IC
DESCRIPTION
The IR3523 Control IC provides a full featured and flexible way to implement a complete dual output DDR &
CPU VTT multiphase power solution for Intel VR11.1 motherboards. Each output interfaces with any number of
xPHASE3^TM Phase ICs each driving and monitoring a single phase. Output 1 includes a 3 bit VR11.x VID, 1.1V
boot voltage and droop to implement the CPU VTT rail which is typically 1 phase. Output 2 includes a 3 bit VID for
margining and supports any number of phases and DDR DIMM modules. The xPHASE3^TM architecture results in a
power supply that is smaller, less expensive, and easier to design while providing higher efficiency than
conventional approaches.
INDEPENDENT FEATURES FOR BOTH OUTPUT 1 & 2
• Enable Input
• Power Good (PG) Output
• 0.5% overall system set point accuracy
• Programmable Softstart
• High speed error amplifier with wide bandwidth of 30MHz and fast slew rate of 12V/us
• Remote sense amplifier provides differential sensing and requires less than 50uA bias current
• Programmable over current threshold triggers constant converter output current limit during start-up and
hiccup protection during normal operation
• Over voltage condition communicated to phase ICs by IIN (ISHARE) and system by ROSC/OVP pins
• Detection and protection of open remote sense lines
OUTPUT 1 ADDITIONAL FEATURES
• 3 bit Intel VR11.x VID (VID4, VID3, VID2)
• Programmable VID offset
• 1.1 V Boot Voltage
• Programmable output impedance
• Programmable VID-on-the-Fly Slew Rate
OUTPUT 2 ADDITIONAL FEATURES
• 3 bit VID provides 1.5 V with ±150mV margining
• Programmable VID-on-the-Fly Slew Rate
FEATURES SHARED BY BOTH OUTPUTS 1 & 2
• Programmable per phase switching frequency of 250kHz to 1.5MHz
• Daisy-chain digital phase timing provides accurate phase interleaving without external components
• Gate Drive and IC bias linear regulator control with programmable output voltage and UVLO
• Over voltage signal to system with over voltage detection during powerup and normal operation
ORDERING INFORMATION
Device
IR3523MTRPBF
* IR3523MPBF
* Samples only
Package
40 Lead MLPQ (6 x 6 mm body)
40 Lead MLPQ (6 x 6 mm body)
Order Quantity
3000 per reel
100 piece strips
Page 1 of 37
June 20, 2008