TPS61097-33 Datasheet, PDF (15/27 Pages) Texas Instruments – LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT

TPS61097
www.ti.com
SLVS872C – JUNE 2009 – REVISED DECEMBER 2011
If the output voltage drops below the input voltage the backgate diode of the rectifying switch gets forward biased
and current starts flow through it. Because this diode cannot be turned off, the load current is only limited by the
remaining DC resistances. As soon as the overload condition is removed, the converter automatically resumes
normal operation and enters the appropriate soft start mode depending on the operating conditions.
Undervoltage Lockout
An undervoltage lockout function stops the operation of the converter if the input voltage drops below the typical
undervoltage lockout threshold. This function is implemented in order to prevent malfunctioning of the converter.
The undervoltage lockout function has no control of the Bypass Switch. If the Bypass Switch is enabled (EN =
V_IL) there is no impact during an undervoltage condition, the Bypass Switch remains on.
Overtemperature Protection
The device has a built-in temperature sensor which monitors the internal IC temperature. If the temperature
exceeds the programmed threshold (150 °C typical), the device stops operating. As soon as the IC temperature
has decreased below the programmed threshold, it starts operating again. There is a built-in hysteresis to avoid
unstable operation at IC temperatures at the overtemperature threshold.
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