t

Voltage (V)

VOUT

VIN

Pass-Through

Down

Mode

Down

Mode

3% Vout

300mV

100mV

50mV

11

TPS61099, TPS610997

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SLVSD88B – JULY 2016 – REVISED DECEMBER 2016

Product Folder Links: TPS61099 TPS610997

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Copyright © 2016, Texas Instruments Incorporated

Feature Description (continued)

Figure 14. Down Mode and Pass-Through Operation

8.3.9 Thermal Shutdown

The TPS61099x has a built-in temperature sensor which monitors the internal junction temperature in boost

mode operation. If the junction temperature exceeds the threshold 150°C, the device stops operating. As soon as

the junction temperature drops below the shutdown temperature minus the hysteresis, typically 125°C, it starts

operating again.

8.4 Device Functional Modes

8.4.1 Burst Mode Operation under Light Load Condition

The boost converter of TPS61099x enters into Burst Mode operation under light load condition. Refer to Boost

Controller Operation for details.

8.4.2 Down Mode Regulation and Pass-Through Mode Operation

The boost converter of TPS61099x automatically enters into Down Mode or pass-through mode operation when

input voltage is higher than the target output voltage. Refer to Down Mode Regulation and Pass-Through

Operation for details.