PIFE32251B-R47MS datasheet(82/96 Pages) TI1

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TPS65094

SWCS133C – SEPTEMBER 2015 – REVISED FEBRUARY 2019

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Power Supply Recommendations

7.4

Do's and Don'ts

•

Connect the LDO5V output to the DRV5V_x_x inputs for situations where an external 5-V supply is not

initially available or is not available the entire time PMIC is on. If the external 5-V supply is always

present, then DRV5V_x_x can be directly connected to remove the V5ANA-to-LDO5P0 load switch

RDSON.

•

Ensure that none of the control pins are potentially floating.

•

Include 0-Ω resistors on the DRVH and BOOT pins of controllers on prototype boards, which allows for

slowing the controllers if the system is unable to handle the noise generated by the large switching or if

switching voltage is too large due to layout.

•

Do not connect the V5ANA power input to a different source other than PVINx. A mismatch here

causes reference circuits to regulate incorrectly.

•

Do not supply the V5ANA power input before the VSYS. Reference biasing of the internal FETs may

turn on the HS FET and pass the input to the output until VSYS is biased.

Power Supply Recommendations

This device is designed to work with several different input voltages. The minimum voltage on the VSYS

pin is 5.6 V for the device to start up; however, this is a low-power rail. The input to the FETs must be

from 5.4 V to 21 V as long as the proper BOM choices are made. Input to the converters must be

5 V. For the device to output maximum power, the input power must be sufficient. For the controllers, VIN

must be able to supply up to 5 A (typically), though less is acceptable with higher voltages or less usage.

For the converters, PVINx must be able to supply 2 A (typically).

A best practice here is to determine power usage by the system and back-calculate the necessary power

input based on expected efficiency values.

PIFE32251B-R47MS Scheda tecnica(PDF) 82 Page - Texas Instruments