ISL6227 Datasheet - Intersil（ISL6227数据表英特锡尔）.pdf

ISL6227 ® Data Sheet May 4, 2009 FN9094.7 Dual Mobile-Friendly PWM Controller with Features DDR Option • Provides Regulated Output Voltage in the Range 0.9V to The ISL6227 dual PWM controller delivers high efficiency 5.5V precision voltage regulation from two synchronous buck DC/DC • Operates From an Input Battery Voltage Range of 5V to converters. It was designed especially to provide power 28V or From 3.3V/5V System Rail regulation for DDR memory, chipsets, graphics and other system electronics in Notebook PCs. The ISL6227’s wide • Complete DDR1 and DDR2 Memory Power Solution with input voltage range capability allows for voltage conversion VTT Tracking VDDQ/2 and a VDDQ/2 Buffered Reference Output directly from AC/DC adaptor or Li-Ion battery pack. • Flexible PWM or HYS Plus PWM Mode Selection with Automatic mode transition of constant-frequency synchronous HYS Diode Emulation at Light Loads for Higher System rectification at heavy load, and hysteretic (HYS) Efficiency diode-emulation at light load, assure high efficiency over a wide range