TPS62870 datasheet(23/66 Pages) TI2

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To detect the least significant bit (LSB):

• If the MSB was 0, the circuit closes S1. If the input buffer detects a high level, LSB = 1. If the circuit detects a

low level, LSB = 0.

• If the MSB was 1, the circuit closes S2. If the input buffer detects a low level, LSB = 0. If the circuit detects a

high level, LSB = 1.

7.3.6 Output Voltage Setting

7.3.6.1 Output Voltage Range

The device has four different voltage ranges. The VRANGE[1:0] bits in the CONTROL2 register control which

range is active (see Table 7-3). The default output voltage range after device initialization is 0.4V to 1.675V in

5mV steps.

Table 7-3. Voltage Ranges

VRANGE[1:0]

VOLTAGE RANGE

0b00

0.4V to 0.71875V in 1.25mV steps

0b01

0.4V to 1.0375V in 2.5mV steps

0b10

0.4V to 1.675V in 5mV steps

0b11

0.8V to 3.3V in 10mV steps

Note that every change to the VRANGE[1:0] bits must be followed by a write to the VSET register, even if the

value of the VSET[7:0] bits does not change. This sequence is required for the device to start to use the new

voltage range.

When changing to or from the 0.8V to 3.35V range, the device switches the internal reference between 0.4V and

0.8V. To avoid any output voltage over or undershoot that can occur during the change, the VRANGE change

must be done at an output voltage that occurs in both the new range and old range and the VSET[7:0] bits must

set the same output voltage in both the new range and old range.

For proper operation, the input voltage needs to be at least 1.4V above the selected output voltage.

In device variants that do not have I2C, the output voltage range is factory-set to 0.4V to 1.675V.

7.3.6.2 Output Voltage Setpoint

Together with the selected range, the VSET[7:0] bits in the VSET register control the output voltage setpoint of

the device (see Table 7-4).

Table 7-4. Start-Up Voltage Settings

VRANGE[1:0]

OUTPUT VOLTAGE SETPOINT

0b00

0.4V + VSET[7:0] × 1.25mV

0b01

0.4V + VSET[7:0] × 2.5mV

0b10

0.4V + VSET[7:0] × 5mV

0b11

0.8V + VSET[7:0] × 10mV

During initialization, the device reads the state of the VSEL pin and selects the default output voltage according

to Table 7-5 . Note that the VSEL pin also selects the I2C target address of the device (see Table 7-10).

Table 7-5. Default Output Voltage Setpoints

VSEL PIN(1)

DEVICE NUMBER

VSET[7:0]

OUTPUT VOLTAGE SETPOINT

6.2 kΩ to GND

TPS6287xZ0

0x50

800mV

TPS6287xZ1

0x28

600mV

TPS6287xZ2

0x14

500mV

TPS6287xZ4

0x5A

850mV

TPS6287xZ5

0x00

400mV

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TPS62870, TPS62871, TPS62872, TPS62873

SLVSGC5E – JANUARY 2023 – REVISED OCTOBER 2025

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