TPS54617RUVR datasheet(14/22 Pages) TI1

Part #	TPS54617RUVR

Description	3-V TO 6-V INPUT, 6-A, SMALL SYNCHRONOUS-BUCK SWITCHER WITH INTEGRATED FETs (SWIFT)

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Thermal Shutdown

Power Good (PWRGD)

TPS54617

SLVS880A – NOVEMBER 2008 – REVISED JANUARY 2009 ........................................................................................................................................... www.ti.com

The device uses the thermal shutdown to turn off the

The power good circuit monitors for under voltage

power MOSFETs and disable the controller if the

conditions on VSENSE. If the voltage on VSENSE is

junction temperature exceeds 150°C. The device is

10% below the reference voltage, the open-drain

released from shutdown automatically when the

PWRGD output is pulled low. PWRGD is also pulled

junction temperature decreases to 10°C below the

low if VIN is less than the UVLO threshold or SS/ENA

thermal shutdown trip point, and starts up under

is low. When VIN

≥ UVLO threshold, SS/ENA ≥

control of the slow-start circuit.

enable threshold, and VSENSE > 90% of Vref, the

open drain output of the PWRGD pin is high. A

Thermal shutdown provides protection when an

hysteresis voltage equal to 3% of Vref and a 35 µs

overload

condition

is

sustained

for

several

falling edge deglitch circuit prevent tripping of the

milliseconds. With a persistent fault condition, the

power good comparator due to high frequency noise.

device cycles continuously; starting up by control of

the soft-start circuit, heating up due to the fault

condition, and then shutting down upon reaching the

thermal shutdown trip point. This sequence repeats

until the fault condition is removed.

14

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