Patent ID: 8040742

Claim:
An apparatus comprising: a first temperature-sensing circuit configured to provide a first temperature indication based on a first temperature threshold resistance, wherein the first temperature-sensing circuit includes: a first amplifier comprising a first positive input and a first negative input, wherein the first negative input is configured to be driven by a temperature-independent signal; a first transistor electrically connected to the first positive input, wherein the first transistor is configured to be controlled by a temperature signal; and a first temperature hysteresis resistance, wherein the first temperature hysteresis resistance and the first temperature threshold resistance are both electrically connected in series to the first positive input, and wherein the first hysteresis resistance is configured to be controlled, at least in part, by an output of the first amplifier; a driver circuit including first and second driver outputs, wherein the driver circuit is configured to: receive the first temperature indication; provide a first output voltage to the first driver output if the first temperature indication is in a first state; and provide a second output voltage to the first driver output if the first temperature indication is in a second state; and a second amplifier configured to amplify a third output voltage from the second driver output and provide the amplified third output voltage back to the driver circuit.