TPS54062_16 Datasheet, PDF (16/42 Pages) Texas Instruments – 4.7-V to 60-V Input, 50-mA Synchronous Step-Down Converter With Low IQ

TPS54062
SLVSAV1D – MAY 2011 – REVISED JULY 2016
www.ti.com
Feature Description (continued)
7.3.11 Thermal Shutdown
The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds 146°C.
The thermal shutdown forces the device to stop switching when the junction temperature exceeds the thermal
trip threshold. Once the die temperature decreases below 146°C, the device reinitiates the power-up sequence
by restarting the internal slow-start.
7.4 Device Functional Modes
7.4.1 Operation Near Minimum Input Voltage
The TPS54062 is recommended to operate with input voltages above 4.7 V. The typical VIN UVLO threshold is
4.53 V and the device may operate at input voltages down to the UVLO voltage. At input voltages below the
actual UVLO voltage, the device will not switch. If EN is floating or externally pulled up to greater up than the
typical 1.24-V rising threshold, when V_(VIN) passes the UVLO threshold the TPS54062 will become active.
Switching is enabled and the slow-start sequence is initiated. The TPS54062 starts linearly ramping up the
internal reference DAC from 0 V to the reference voltage over the internal slow-start time period set by the
switching frequency.
7.4.2 Operation With Enable Control
The enable start threshold voltage is 1.24 V typical. With EN held below the 1.24-V typical rising threshold
voltage the TPS54062 is disabled and switching is inhibited even if VIN is above its UVLO threshold. The
quiescent current is reduced in this state. If the EN voltage is increased above the rising threshold voltage while
V_(VIN) is above the UVLO threshold, the device becomes active. Switching is enabled and the slow-start
sequence is initiated. The TPS54062 starts linearly ramping up the internal reference DAC from 0 V to the
reference voltage over the internal slow-start time period set by the switching frequency. If EN is pulled below the
1.14-V typical falling threshold the TPS54062 will enter the reduced quiescent current state again.
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