TPS25980X datasheet(23/55 Pages) TI

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IMON

OUT

IMON

A / A

(6)

It is recommended to limit the maximum IMON voltage to the values mentioned in VIMON(Max) Recommended

Values . This is to ensure the IMON pin internal amplifier has sufficient headroom to operate linearly.

Table 8-2. VIMON(MAX) Recommended Values

VIN

Recommended VIMON(MAX)

2.7 V

1 V

3.3 V

1.8 V

> 5 V

3.3 V

It is recommended to add a RC low pass filter on the IMON output to filter out any glitches and get a smooth

average current measurement. TI recommends a series resistance of 10 kΩ or higher.

8.3.6 Power Good (PG)

PG is an active high open drain output which indicates whether the FET is fully turned ON and the output voltage

has reached the maximum value. After power-up, PG is pulled low initially. The gate driver circuit starts charging

the gate capacitance from the internal charge pump. When the FET gate voltage reaches (VIN + 3.6V), PG is

asserted after a de-glitch time (tPGD). During normal operation, if at any time VOUT falls below (VIN - VPGTHD), PG

is de-asserted after a de-glitch time (tPGD).

Time

OUT

VPG

VGate

VIN + 3.6V

EN/UVLO

VUVLO(R)

Slew rate (dVdt) controlled

startup/Inrush current limiting

VIN

Overcurrent Event

Overcurrent Removed

ILIM

IINRUSH

120 µs

tITIMER

IOUT

Current limiting

operation

120 µs

VIN

dVdT

Device Enabled

VPGTHD

Figure 8-5. Power Good Assertion and De-assertion

www.ti.com

TPS25980

SLVSFR1 – AUGUST 2020

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