Charge Pump

VIN

EN/UVLO

VOUT

GND

CT

Control Logic

2.54 V

2.4 V

1.23 V

1.13 V

Thermal

Shutdown

QOD

Copyright © 2016, Texas Instruments Incorporated

13

TPS22810

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SLVSDH0C – DECEMBER 2016 – REVISED JANUARY 2018

Product Folder Links: TPS22810

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Copyright © 2016–2018, Texas Instruments Incorporated

9.2 Functional Block Diagram

9.3 Feature Description

9.3.1 On and Off Control

TThe EN/UVLO pin controls the state of the switch. EN/UVLO is active high and has a low threshold, making it

capable of interfacing with low-voltage signals. The EN/UVLO pin is compatible with standard GPIO logic

threshold. It can be used with any microcontroller with 1.2 V or higher GPIO voltage. This pin cannot be left

floating and must be driven either high or low for proper functionality.

9.3.2 Quick Output Discharge (QOD)

The TPS22810 includes a QOD feature. The QOD pin can be configured in one of three ways:

•

QOD pin shorted to VOUT pin. Using this method, the discharge rate after the switch becomes disabled is

controlled with the value of the internal resistance RPD. The value of this resistance is listed in the Electrical

Characteristics table.

•

QOD pin connected to VOUT pin using an external resistor REXT. After the switch becomes disabled, the

discharge rate is controlled by the value of the total resistance of the QOD. To adjust the total QOD

resistance, Equation 1 can be used.

RQOD = RPD + REXT

where

•

RQOD is the total output discharge resistance

•

RPD is the internal pulldown resistance

•

REXT is the external resistance placed between the VOUT and QOD pin.

(1)