LX1673-09CPW中文资料Step-Down Buck Controllers数据手册Microchip规格书

描述 Description

Key Features:Two Independently Regulated OutputsOutputs As Low As 0.8V Generated From An Internal 1% ReferenceIntegrated High Current MOSFET Drivers300KHz, 600KHz, and 900KHz High Frequency Operation Minimizes External Component RequirementsSoft-Start and Power Sequencing ControlAdjustable Linear Regulator Driver OutputNo current-sense resistorsDescription:The LX1673 is a highly integrated power supply controller IC featuring one PWM switching regulator stage with an additional onboard linear regulator driver. With several switching frequencies available (up to 900kHz) the LX1673 can be optimized for both cost and PCB space. Utilizing external compensation, a wide selection of external components can be chosen for use in any application while maintaining stable operation.The LX1673 incorporates fully programmable soft-start and power sequence capabilities. The LDO and PWM have independent enable pins.With onboard gate drivers, the switching PWM output is capable of sourcing up to 15A. The LX1673 also features an additional Linear Regulator Controller output, which when coupled with an inexpensive MOSFET is capable of supplying up to an additional 5A for I/O, memory, and other supplies surrounding today’s micro-processor designs.Each regulator output voltage is programmed via a simple voltage-divider network. Integrated hiccup-mode current limiting is implemented utilizing MOSFET RDS(ON) impedance. This enables the LX1673 to monitor maximum current limit conditions without the use of expensive current sense resistors.  ROHS