TPS62870 datasheet(26/66 Pages) TI2

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7.3.10 Output Discharge

The device has an output discharge function that makes sure of a defined ramp down of the output voltage when

the device is disabled and keeps the output voltage close to 0V while the device is off. The output discharge

function is enabled when DISCHEN = 1 in the CONTROL1 register. The output discharge function is enabled by

default.

If enabled, the device discharges the output under the following conditions:

• A low level is applied to the EN pin.

• SWEN = 0 in the CONTROL1 register.

• A thermal shutdown event occurs.

• A UVLO event occurs.

• An OVLO event occurs.

The output discharge function is not available until the user has enabled the device at least once after power up.

During power down, the device continues to discharge the output for as long as the internal supply voltage is

greater than approximately 1.8V.

7.3.11 Undervoltage Lockout (UVLO)

The device has an undervoltage lockout function that disables the device if the supply voltage is too low for

correct operation. The negative-going threshold of the UVLO function is 2.5V (typical). If the supply voltage

decreases below this value, the device stops switching and, if DISCHEN = 1 in the CONTROL1 register, turns

on the output discharge. In addition, the EN pin is pulled low, which disables all other devices in the stack. The

device automatically starts switching again and begins a new soft-start sequence when the supply voltage is

higher than 2.6V (typical).

7.3.12 Overvoltage Lockout (OVLO)

The device has an overvoltage lockout function that disables the DC/DC converter if the supply voltage is too

high for correct operation. The positive-going threshold of the OVLO function is 6.3V (typical). If the supply

voltage increases above this value, the device stops switching and, if DISCHEN = 1 in the CONTROL1 register,

turns on the output discharge.

The device automatically starts switching again – the device begins a new soft-start sequence – when the supply

voltage falls below 6.2V (typical).

7.3.13 Overcurrent Protection

7.3.13.1 Cycle-by-Cycle Current Limiting

If the peak inductor current increases above the high-side current limit threshold, the device turns off the

high-side switch and turns on the low-side switch to ramp down the inductor current. The device only turns on

the high-side switch again if the inductor current has decreased below the low-side current limit threshold.

Note that because of the propagation delay of the current limit comparator, the current limit threshold in practice

can be greater than the DC value specified in the Electrical Characteristics. The current limit in practice is given

by:

IL= ILIMH+ VIN− VOUTL ×tpd

(5)

where:

• IL is the inductor current.

• ILIMH is the high-side current limit threshold measured at DC.

• VIN is the input voltage.

• VOUT is the output voltage.

• L is the effective inductance at the peak current level.

• tpd is the propagation delay of the current limit comparator (typically 50ns).

TPS62870, TPS62871, TPS62872, TPS62873

SLVSGC5E – JANUARY 2023 – REVISED OCTOBER 2025

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