XR76121中文资料20A, 22V Synchronous Step-Down COT Regulator数据手册MaxLinear规格书

描述 Description

The XR76121 is a synchronous step-down regulator combining the controller, drivers, bootstrap diode and MOSFETs in a single package for point-of-load supplies. The XR76121 has a load current rating of 20A. A wide 5V to 22V input voltage range allows for single supply operation from industry standard 5V, 12V and 19.6V rails.
With a proprietary emulated current mode Constant On-Time (COT) control scheme, the XR76121 provides extremely fast line and load transient response using ceramic output capacitors. It requires no loop compensation, simplifying circuit implementation and reducing overall component count. The control loop also provides 0.1% load and 0.1% line regulation and maintains constant operating frequency. A selectable power saving mode, allows the user to operate in Discontinuous Mode (DCM) at light current loads thereby significantly increasing the converter efficiency.
A host of protection features, including overcurrent, over temperature, overvoltage, short-circuit, open feedback detect and UVLO, helps achieve safe operation under abnormal operating conditions.
The XR76121 is available in a RoHS-compliant, green/halogen-free space-saving 5mm x 6mm QFN package.

特性 Features

·Controller, drivers, bootstrap diode and MOSFETsintegrated in one package
·20A  step-down regulator
·Wide 5.0V to 22V input voltage range
·3V to 22V PVIN with 5V bias
·4.5V to 5.5V single supply operation
·≥0.6V adjustable output voltage
·Proprietary constant on-time control
·No loop compensation required
·Stable ceramic output capacitor operation
·Programmable 70ns to 1μs on-time
·Constant 200kHz to 1MHz frequency
·Selectable CCM or CCM/DCM
·CCM/DCM for high efficiency at light load
·CCM for constant frequency at light load
·Precision enable
·Low impedance power good flag with unpowered
·Programmable soft-start
·17-pin 5mm x 6mm QFN package
·Pin compatible 15A regulator – XR76117

应用 Application

·Servers
·Point-of-Load (POL) converters
·Industrial control and automation
·FPGA, DSP and processor supplies
·Base stations, switches/routers
·Telecommunications and Infrastructure equipment