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转 TPS5630  

2015-11-22 18:47:48|  分类: 元器件 |  标签: |举报 |字号 订阅

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DUAL-OUTPUT LOW-INPUT-VOLTAGE
DSP POWER SUPPLY CONTROLLER WITH SEQUENCING

2.8 V – 5.5 V Input Voltage Range
Programmable Dual Output Controller Supports Popular DSP, FPGA and Microcontroller Core and I/O Voltages
–  Switching Regulator Controls I/O Voltage
–  Low Dropout Controller Regulates CoreVoltage
Adjustable Slow-Start for Simultaneous Powerup of Both Outputs
Power Good Output Monitors Both Outputs
Fast Ripple Regulator Reduces BulkCapacitance for Lower System Costs
±1.5% Reference Voltage Tolerance
Efficiencies Greater Than 90%
Overvoltage, Undervoltage, and AdjustableOvercurrent Protection
Drives Logic Level N-Channel MOSFETsThrough Entire Input Voltage Range
Evaluation Module TPS56302EVM–163 Available

转  TPS5630 - 易拉罐bb - 易拉罐的博客
 
description 
       The high-performance TPS56302 synchronous-buck regulator provides two supply voltages to power the core and I/O of digital signal processors. The TPS56302 is identical to the TPS56300 except that the referencevoltages of the LDO and switching regulator have been reversed. The switching regulator, using hystereticcontrol with droop compensation, supports high current and efficiency for the I/O and other peripheralcomponents. The LDO controller, suitable for powering the core voltage, drives an external N-channel powerMOSFET and functions as an LDO regulator and as a power distribution switch.

typical design
转  TPS5630 - 易拉罐bb - 易拉罐的博客
 
To promote better system reliability during power up, voltage sequencing and protection are controlled such thatthe core and I/O power up together with the same slow-start voltage. At power down, the LDO and rippleregulator are discharged towards ground for added protection. The TPS56302 also includes inhibit, slow-start,and under-voltage lockout features to aide in controlling power sequencing. A tri-level voltage identificationdefinition (VID) sets both regulated voltages to any of 9 preset voltage pairs from 1.3 V to 3.3 V. Other voltagesare possible by implementing an external voltage divider. Strong MOSFET drivers, with a typical peak currentrating of 2-A sink and source are included on chip, which allows paralleling MOSFETs to be driven and allowinghigher current to be controlled. The high-side driver features a floating bootstrap driver with an internal bootstrapsynchronous rectifier. Many protection features are incorporated within the device to ensure better systemintegrity. An open-drain output power good status circuit monitors both output voltages, and is pulled low if eitheroutput falls below the threshold. An over current shutdown circuit protects the high-side power MOSFET againstshort-to-ground faults, while over voltage protection turns off the output drivers and LDO controller if eitheroutput exceeds its threshold. Under voltage protection turns off the high-side and low-side MOSFET drivers andthe LDO controller if either output is 25% below VREF. Lossless current-sensing is implemented by detectingthe drain-source voltage drop across the high-side power MOSFET while it is conducting. The TPS56302 is fullycompliant with TI DSP power requirements.





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