PIFE32251B-R68MS datasheet(57/157 Pages) TI1

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VDC

VIN

LDO3P1V

VBATTBKUP

LDO5V

3.1V LDO

UVLO

V3P3A_RTC

RTC

DIG

1kW

Coincell

Battery

TPS650830

www.ti.com

SLVSCF4A – DECEMBER 2014 – REVISED JULY 2016

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Product Folder Links: TPS650830

Detailed Description

6.3.6

RTC Selector and 3.1-V LDO

The RTC selector is used to select between the coincell backup battery or the internal 3.3-V LDO to power

the 3P3A_RTC output rail for the RTC domain rail. If the Vin is below the UVLo5V threshold, the coincell

battery is selected. If the Vin is greater than the UVLO5V, then the internal 3.1-V LDO is selected. The

backup battery selector logic has a very low current draw when battery is selected to extend the charge

life of the backup battery. This rail allows keeping the RTC registers' data even when the adapter and

main battery is removed from the system. If the coincell voltage falls below the minimum threshold, the

RTC registers will be reset to the default values. The 3.1-V LDO is at 3.1 V to ensure the PCH voltage is

always below 3.2 V maximum to protect the PCH.

Figure 6-6. RTC Selector and 3.1-V LDO

6.3.7

Power Path Comparators

The Power Path comparators are high voltage comparators rated at 28 V both input and output that are

independent of the rest of the PMIC. These can be used even when the PMIC is powered down, as long

as the VINPP pin is above the UVLO5V threshold. Connect a resistor divider from the source to set the

1.25-V trigger threshold. These comparators can be used to detect adapter, and up to two batteries. An

open-drain pin can detect the status, and a status register detects the status, that can issue an interrupt to

the EC. The high voltage rated outputs can be used to turn on external P-channel power MOSFETs to

control the power source path. A diode "OR" connection from all the power sources used is recommended

to ensure the VINPP is up when a source is available. If these comparators are not used tie the VINPP pin

to VIN and VIN_LDO3. Do not ground the VINPP pin when the VIN pin is powered up. These comparators

can also be used a general purpose comparators.

PIFE32251B-R68MS 데이터시트(PDF) 57 Page - Texas Instruments

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