Datasheet

TPS65140, TPS65141

TPS65145

SLVS497E –SEPTEMBER 2003–REVISED NOVEMBER 2012

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circuit condition, the TPS65140/45 goes into shutdown. Because there is a direct pass from the input to the

output through the diode, the short-circuit condition remains. If this condition needs to be avoided, a fuse at the

input or an output disconnect using a single transistor and resistor is required. The negative and positive charge

pumps have an undervoltage lockout (UVLO) to protect the LCD panel of possible latch-up conditions due to a

short-circuit condition or faulty operation. When the negative output voltage is typically above 9.5% of its output

voltage (closer to ground), then the device enters shutdown. When the positive charge pump output voltage,

3, is below 8% typical of its output voltage, the device goes into shutdown. See the fault protection thresholds

in the electrical characteristics table. The device is enabled by toggling the enable pin (EN) below 0.4 V or by

cycling the input voltage below the UVLO of 1.7 V. The linear regulator reduces the output current to 20 mA

typical under a short-circuit condition when the output voltage is typically < 1 V. See the functional block diagram.

The linear regulator does not go into shutdown under a short-circuit condition.

Thermal Shutdown

A thermal shutdown is implemented to prevent damage due to excessive heat and power dissipation. Typically,

the thermal shutdown threshold is 160°C. If this temperature is reached, the device goes into shutdown. The

device can be enabled by toggling the enable pin to low and back to high or by cycling the input voltage to GND

and back to V

again.

Product Folder Links: TPS65140 TPS65141 TPS65145