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the supply voltage increases again. During initialization, the device reads the state of the FSEL, VSEL, and

SYNC_OUT pins.

After the device completes the initialization, the following functions are available in standby mode:

• I2C interface

• Output discharge

• Power good

The device leaves standby mode and enters UVLO mode when the supply voltage decreases below the UVLO

threshold. The device leaves standby mode and enters on mode when all of the following conditions are true:

• A high-level is applied to the EN pin.

• SWEN = 1 in the CONTROL1 register.

• The device junction temperature is below the thermal shutdown threshold.

• The supply voltage is below the OVLO threshold.

7.4.4 On

The device operates in on mode when the supply voltage is greater than the UVLO threshold and all of the

following conditions are true:

• A high-level is applied to the EN pin.

• SWEN = 1 in the CONTROL1 register.

• The device junction temperature is below the thermal shutdown threshold.

• The supply voltage is below the OVLO threshold.

All functions are available in on mode.

The device leaves on mode and enters UVLO mode when the supply voltage decreases below the UVLO

threshold. The device leaves on mode and enters standby mode when any of the following conditions is true:

• A low level is applied to the EN pin.

• SWEN = 0 in the CONTROL1 register.

• The device junction temperature is greater than the thermal shutdown threshold.

• The supply voltage is greater than the OVLO threshold.

7.5 Programming

7.5.1 Serial Interface Description

I2C is a 2-wire serial interface developed by Philips Semiconductor, now NXP Semiconductors (see I2C-Bus

Specification and User Manual, Revision 6, 4 April 2014). The bus consists of a data line (SDA) and a clock line

(SCL) with pullup structures. When the bus is idle, both SDA and SCL lines are pulled high. All I2C-compatible

devices connect to the I2C bus through open-drain I/O pins, SDA and SCL. A controller, usually a microcontroller

or a digital signal processor, controls the bus. The controller is responsible for generating the SCL signal and

device addresses. The controller also generates specific conditions that indicate the START and STOP of data

transfer. A target receives data, transmits data, or both on the bus under control of the controller.

The TPS6287x device operates as a target and supports the following data transfer modes, as defined in

the I2C-Bus Specification: standard mode (100Kbps), fast mode (400Kbps), and fast mode plus (1Mbps). The

interface adds flexibility to the power supply design, enabling most functions to be programmed to new values

depending on the instantaneous application requirements. Register contents remain intact as long as the input

voltage remains above 1.4V.

The data transfer protocol for standard and fast modes is exactly the same, therefore, the modes are referred to

as F/S-mode in this document. The device supports 7-bit addressing; general call addresses are not supported.

The state of the VSEL pin during power up defines the I2C target address of the device (see Table 7-10). Note

that the VSEL pin also sets the default start-up voltage of the device (see Table 7-4).

Table 7-10. I2C Interface Target Address Selection

VSEL PIN

I2C TARGET ADDRESS (1)

6.2kΩ to GND

0x40

TPS62870, TPS62871, TPS62872, TPS62873

SLVSGC5E – JANUARY 2023 – REVISED OCTOBER 2025

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