IR公司的IR3522是XPHASE3TMDDR&VTT控制IC,而IR3506是XPHASE3TMDDR&VTT相位IC,两者的组合可以实现全特性的DDR3电源解决方案.本文介绍了IR3522和IR3506的主要特性,方框图,IR3522输出1和输出2系统设置点测试电路,PWM方框图和IR3522与IR3506的典型应用电路.XPHASE3TMDDR&VTTCONTROLICIR3522TheIR3522ControlICcombinedwithIR3506xPHASE3TMPhaseICsimplementsafullfeaturedDDR3powersolution.TheIR3522providescontrolfunct
IR公司的IR3522是XPHASE3TM DDR &
amp; VTT控制
IC,而IR3506是XPHASE3TM DDR & VTT 相位IC,两者的组合可以实现全特性的DDR3
电源解决方案.本文介绍了IR3522和IR3506的主要特性,方框图, IR3522输出1和输出2系统设置点测试电路, PWM 方框图和IR3522与IR3506的典型应用电路.
XPHASE3TM DDR & VTT C
ONTROL IC IR3522
The IR3522 Control IC combined with IR3506 xPHASE3TM Phase ICs implements a full featured DDR3 power solution. The IR3522 provides control functions for both the VTT (single phase) and VDDR (mu
ltiphase) power rails which can interfaces with any number of IR3506 ICs each driving and monitoring a single phase to power any number of DDR3 DIMMs. The xPHASE3TM architecture delivers a power supply that is smaller, more flexible, and easier to design while providing higher efficiency than conventional approaches.
IR3522主要特性:
??I2C interface programs 1.025V< VREF1<1.612V, the VDD output voltage reference
??I2C also programs the VTT tracking ratio ± 25 %, and provides digital ON/OFF control
??Four different I2C addresses are selectible using 2 ADDR pins
??Four different VREF1 voltages are selectible using 2 VID pins if I2C communication is not available
??VTT tracking defaults to ½ the VDD Remote Sense Amp output voltage
??Power Good output driven by an external bias input
??VDD to VTT overvoltage protection
??Soft-Stop turn-off to ensure VDDR and Vtt tracking
??Fault activated Crowbar pin to drive external NMOS devices for external output voltage protection
??Pin programmable slew rate of I2C programmed VREF1 voltage transitions
??0.5% overall VDD system set point accuracy
??Remote sense amplifiers provide differential sensing and requires less than 50uA bias current
??Pin programmable
perphase switching frequency of 250kHz to 1.5MHz
