XR79120中文资料22V, 20A Synchronous Step-Down Constant On-Time QFN Module数据手册MaxLinear规格书

描述 Description

The XR79120 is a synchronous step-down controller for Point-of Load (POL) supplies up to 20A. A wide 4.5V 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 XR79120 provides extremely fast line and load transient response using ceramic output capacitors. It requires no loop compensation hence simplifying circuit implementation and reducing overall component count. The control loop also provides exceptional load and 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, short-circuit and UVLO, help achieve safe operation under abnormal operating conditions.
The XR79120 is available in RoHS compliant, green/halogen free space saving 12mm x 14mm x 4mm QFN package.

特性 Features

·20Amp power module·Integrated MOSFETs and inductors
·Efficiency >93%

·Wide 4.5V 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

·Constant on-time control·No loop compensation required
·Stable ceramic output capacitor operation
·Programmable 200ns to 2µs on-time
·Constant 400kHz to 600kHz frequency

·Selectable CCM or CCM/DCM modes·CCM/DCM for high efficiency at light-load
·CCM for constant frequency at light-load

·Programmable current limit with thermal compensation
·Precision enable and Power-Good flag
·Programmable soft-start
·10A power module, XR79110
·15A power module, XR79115

应用 Application

·Networking and communications
·Fast transient Point-of-Loads (POL)
·Industrial and medical equipment
·Embedded high power FPGA