IN

ON

OUT

GND

QOD Resistance

Reverse Current

Blocking

(Not in TPS22916CN)

Smart

Pull Down

Resistance

Control Logic

Driver

Copyright © 2017, Texas Instruments Incorporated

9

TPS22916

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SLVSDO5 – JULY 2017

Product Folder Links: TPS22916

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Copyright © 2017, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

This family of devices are single channel, 2-A load switches in ultra-small, space saving 4-pin WCSP package.

These devices implement a low resistance P-channel MOSFET with a controlled rise time for applications that

need to limit inrush current.

These devices are designed to have very low leakage current during off state. This prevents downstream circuits

from pulling high standby current from the supply. Integrated control logic, driver, power supply, and output

discharge FET eliminates the need for additional external components, which reduces solution size and BOM

count.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 On and Off Control

The ON pin controls the state of the switch. The ON pin is compatible with standard GPIO logic threshold. It can

be used with any microcontroller with 1.2-V, 1.8-V, 2.5-V, 3.3-V, or 5.5-V GPIO.

8.3.2 Quick Output Discharge (QOD)

The TPS22916B/C/CL include a Quick Output Discharge feature. The TPS22916CN does not include a Quick

Output Discharge Feature. When the switch is disabled, a discharge resistor is connected between VOUT and

GND. This resistor has a typical value of QOD and prevents the output from floating while the switch is disabled.

capacitance is, the longer it takes to discharge the capacitor, resulting in a longer fall time.

Capacitance discharge follows Equation 1.