TEMPERATURE-BASED SWITCHED-MODE POWER SUPPLY

摘要

Temperature sensing is employed within a device to enable one or more modes of a switched- mode power supply (SMPS) coupled between an integrated circuit (IC) and power source when corresponding threshold temperatures are detected, A temperature-controlled SMPS might provide the advantage of reducing overall temperature drift of the IC device's standby current, providing a corresponding increase in power supply efficiency of, for example, a battery used to power the IC in a mobile phone. During a low-power standby mode, the SMPS is disabled and the power supply is directly coupled to a voltage regulator that drives the device's IC core circuitry. When the device transitions to an active mode, the signal from a temperature sensor incorporated into the power supply is monitored and, when a threshold is reached, the SMPS is enabled and coupled to a voltage regulator that drives the device's IC core circuitry. Temperature sensing allows for regulation of power supply output used to drive the device's SMPS and IC core circuitry so as to, for example, reduce effects from temperature-varying leakage current.