IR3521具有两个转换器输出,可用于AMD处理器VDD核和VDDNB辅助平面,整个系统设定点精度为0.5%. IR3521集成xPHASE3TM 相IC,提供了整个系统控制以及任意数量的相IC 接口,并监测单相电源,从而实现了完整的AMD SVID电源解决方案.本文介绍了IR3521主要特性,方框图,以及应用电路图和双输出AMD SVID转换器电路图.

The IR3521 Control IC combined with an xPHASE3TM Phase IC provides a full featured and flexible way to implement a complete AMD SVID power solution. It provides outputs for both the VDD core and VDDNB auxiliary planes required by the CPU. The IR3521 provides overall system control and interfaces with any number of Phase ICs each driving and monitoring a single phase. The xPHASE3TM architecture results in a power supply that is smaller, less expensive, and easier to design while providing higher efficiency than conventional approaches.

IR3521主要特性:
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2 converter outputs for the AMD processor VDD core and VDDNB auxiliary planes
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Supports High Speed (HS) I2C Serial communications
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PSI_L serial commands are communicated to a programmable number of phase ICs
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0.5% overall system set point accuracy
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High speed error amplifiers with wide bandwidth of 20MHz and fast slew rate of 10V/us
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Remote sense amplifiers provide differential sensing and require less than 50uA bias current
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Programmable Dynamic VID Slew Rates
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Programmable VID Offset (VDD output only)
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Programmable output impedance (VDD output only)
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Programmable Dynamic OC for IDD_Spike
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Programmable per phase switching frequency of 250kHz to 1.5MHz
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Hiccup over current protection with delay during normal operation
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Central over voltage detection and communication to phase ICs through IIN (ISHARE) pin
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OVP disabled during dynamic VID down to prevent false triggering
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Over voltage signal to system with over voltage detection during powerup and normal operation
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Detection and protection of open remote sense lines
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Gate Drive and IC bias linear regulator control with programmable output voltage and UVLO

Small thermally enhanced 32L MLPQ (5mm x 5mm) package

图1.IR3521方框图

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