Datasheet

TPS2060, TPS2064

TPS2068, TPS2069

SLVS553K – MARCH 2005– REVISED MAY 2011

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Current Sense

A sense FET monitors the current supplied to the load. The sense FET measures current more efficiently than

conventional resistance methods. When an overload or short circuit is encountered, the current-sense circuitry

sends a control signal to the driver. The driver in turn reduces the gate voltage and drives the power FET into its

saturation region, which switches the output into a constant-current mode and holds the current constant while

varying the voltage on the load.

Thermal Sense

The TPS206x implements a thermal sensing to monitor the operating temperature of the power distribution

switch. In an overcurrent or short-circuit condition the junction temperature rises. When the die temperature rises

to approximately 140°C due to overcurrent conditions, the internal thermal sense circuitry turns off the switch,

thus preventing the device from damage. Hysteresis is built into the thermal sense, and after the device has

cooled approximately 10 degrees, the switch turns back on. The switch continues to cycle off and on until the

fault is removed. The open-drain false reporting output (OCx) is asserted (active low) when an overtemperature

shutdown or overcurrent occurs.

Undervoltage Lockout

A voltage sense circuit monitors the input voltage. When the input voltage is below approximately 2 V, a control

signal turns off the power switch.