ISL6225

ISL6225 NOTRREECCOOMMMMEENNDIDSEELDD62RF2EO7PRLANCEEWMDEENSTI:GNS Dual Mobile-Friendly PWM Controller with DDR Memory Option DATASHEET FN9049 Rev 7.00 December 28, 2004 The ISL6225 dual PWM controller delivers high efficiency and tight regulation from two voltage regulating synchronous buck DC/DC converters. The ISL6225 PWM power supply controller was designed especially for DDR DRAM, SDRAM, and graphic chipset applications in high performance desknote PCs, notebook PCs, sub-notebook PCs, and PDAs. Automatic mode selection of constant-frequency synchronous rectification at heavy load, and hysteretic diode-emulation at light load, assure high efficiency over a wide range of conditions. The hysteretic mode of operation can be disabled separately on each PWM converter if constant-frequency continuous-conduction operation is desired for all load levels. Efficiency is further enhanced by using the lower MOSFET rDS(ON) as the current sense element. Voltage-feed-forward ramp modulation, a...