SC2446A中文资料Not Recommended for New Designs; use SC2447数据手册Semtech规格书

描述 Description

The SC2446A is a high-frequency dual synchronous stepdown switching power supply controller. It provides out-of-phase output gate signals. The SC2446A operates in synchronous continuous-conduction mode.

特性 Features

·2-Phase synchronous continuous conduction mode for high efficiency step-down converters
·Out of phase operation for low input current ripples
·Output source and sink currents
·Fixed frequency peak current-mode control
·50mV/-75mV maximum current sense voltage
·Inductive current-sensing for low-cost applications
·Optional resistor current-sensing for precise current-limit
·Dual outputs or 2-phase single output operation
·Excellent current sharing between individual phases
·Wide input voltage range: 4.7V to 16V
·Individual soft-start, overload shutdown and enable
·Duty cycle up to 88%
·0.5V feedback voltage for low-voltage outputs
·External reference input for DDR applications
·Programmable frequency up to 1MHz per phase
·External synchronization
·Industrial temperature range
·28-lead TSSOP lead free package. This product is fully WEEE and RoHS compliant

应用 Application

·Telecommunication power supplies
·DDR memory power supplies
·Graphic power supplies
·Servers and base stations