High-Speed Step-Down Controller with LDO Controller for Notebook Computer CXSD62358 PWM controller uses constant on-time control scheme to handle wide input/output voltage ratios with ease and provide

   产品概述 返回TOPfTR嘉泰姆

    CXSD62358 PWM controller uses constant on-time control scheme to handle wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. The CXSD62358 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by an ability to drive very large synchronous rectifier MOSFETs. Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size. The CXSD62358 is intended for CPU core, chipset, DRAM, or other low-voltage supplies as low as 0.75V. CXSD62358 LDO controller can drive an external NMOSFET to provide a second output voltage from PWM output or other power source. It is adjusted output from 0.75V. The independent enable input, open-drain power good indicator, under-voltage protection and soft-start are provided for system application. The CXSD62358 is available in 16-pin TQFN (3X3) package

   产品特点 返回TOPfTR嘉泰姆

--PWM Controller fTR嘉泰姆

„ Ultra-High Efficiency fTR嘉泰姆

„ No Current-Sense Resistor (Lossless ILIMIT) fTR嘉泰姆

„ Quasi-PWM with 100ns Load-Step Response fTR嘉泰姆

„ 1% VOUT Accuracy Over Line and Load fTR嘉泰姆

„ 0.75V to 3.6V Adjustable Output Range fTR嘉泰姆

„ 4.5V to 24V Battery Input Range fTR嘉泰姆

„ OVP & UVP fTR嘉泰姆

„ 1.7ms Soft-Start fTR嘉泰姆

„ Drives Large Synchronous-Rectifier FETs fTR嘉泰姆

„ Power-Good Indicator fTR嘉泰姆

--LDO Controller fTR嘉泰姆

„ 1.5% Accuracy Over Line and Load fTR嘉泰姆

„ Adjustable Output down to 0.75V fTR嘉泰姆

„ Independent Enable and Power Good Indicator fTR嘉泰姆

„ Drives N-channel MOSFET within Rail to Rail Controller Voltage fTR嘉泰姆

„ MLCC and POSCAP StablefTR嘉泰姆

   应用范围 返回TOPfTR嘉泰姆

„ Notebook ComputersfTR嘉泰姆

„ CPU Core Supply fTR嘉泰姆

„ Chipset/RAM Supply as Low as 0.75V fTR嘉泰姆

„ 1.8V and 2.5V I/O Supply fTR嘉泰姆

„ Networking Power SupplyfTR嘉泰姆

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