资 源 简 介
High-Efficiency, Triple-Output System Power Supply Controller for Notebook ComputersThe ISL62391, ISL62392 controller generates supply voltagesfor battery-powered systems. It includes two pulse-widthmodulaTIon (PWM) controllers, adjustable from 0.6V to 5.5V,and a linear regulator (LDO3) that generates a fixed 3.3V andcan deliver up to 100mA. The ISL62391, ISL62392 includeson-board power-up sequencing, a power-good (PGOOD)output, digital soft-start, and internal soft-stop outputdischarge that prevents negaTIve voltages on shutdown.The patented R3 PWM control scheme provides a low jittersystem with fast response to load transients. Light-loadefficiency is improved with period-stretching disconTInuousconducTIon mode (DCM) operation. To eliminate noise inaudio frequency applications, an ultrasonic DCM mode isincluded, which limits the minimum switching frequency to28kHz.The ISL62391 and ISL62392 are identical except for howtheir overvoltage protection is handled. The ISL62391utilizes a tri-state overvoltage scheme, whereas theISL62392 employs a soft-crowbar method.The ISL62391, ISL62392 is available in a 28 Ld 4x4 TQFNpackage and operates over the extended temperature range(-10°C to +100°C).
