8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

Push-button controllers play an important role in any human-machine interface (HMI) design. They decode user

inputs from single or multiple button presses, control system power or reset, and perform other essential user

interface functions. TPS3423 and TPS3424 devices are designed to extend the shelf life of battery powered

applications.

8.2 Typical Applications

8.2.1 Power Button Control with TPS3424

TPS3424 is designed for power button applications which need to put the system in deep sleep mode with very

small standby power. TPS3424 controls enable for load switch or DC-DC converter in latched mode of RST pin.

An application diagram is shown in Figure 8-1.

VDD

PB

Kill

INT

SPT

RST

LPT

GND

GND

0

3V

TPS3424

ON

VIN

MCU

Push-bu on

VOUT

GND

TPS22991

Figure 8-1. TPS3424 Application Diagram

8.2.1.1 Design Requirements

Table 8-1 lists the design requirements for Figure 8-1.

Table 8-1. Design Requirements and Results

DESIGN REQUIREMENTS

DESIGN RESULT

Single input

PB

TON = 100ms

tSP= 100ms

TOFF = 1sec

tSP= 1sec

Supply = 3V

VDD = 3V

MCU IO pin current rating < 500uA

INT & KILL pull up = 10kΩ

8.2.1.2 Detailed Design Procedure

Short press on the PB pin triggers the RESET, which enables the load switch TPS22991 and INT signal notifies

to MCU. Load switch TPS22991 can be disabled either by a long press on the PB pin as shown Figure 8-2 or

through KILL pin as shown in Figure 8-3 and Figure 8-4.

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TPS3423, TPS3424

SNVSCN9 – SEPTEMBER 2024

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