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US 9,426,748 B2Granted
Dynamic sleep mode based upon battery charge
AssigneeQUALCOMM Incorporated
InventorsAli Taha, Hector Freires Corleto, Rahul Kashyap
Life of this patent
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Abstract
A power management technique is provided that operates with regard to a dynamic sleep threshold voltage. If a device's battery voltage is greater than the dynamic sleep threshold voltage, a voltage rail for the device is collapsed during a sleep mode for the device. Conversely, if the battery voltage is less than the dynamic sleep threshold voltage, the voltage rail is sourced during the sleep mode for the device.
Claims20
A power management integrated circuit (PMIC), comprising:
- a first power regulator;
- and
- a control logic circuit configured to control the first power regulator to source a corresponding power rail while a battery voltage is less than a dynamic sleep threshold voltage when a device powered by the corresponding power rail is in the sleep mode and to power collapse the corresponding power rail while the battery voltage is greater than the dynamic sleep threshold voltage when the device is in the sleep mode.
A method, comprising:
- responsive to a device transitioning to a sleep mode of operation, shutting off a first power regulator for a first voltage rail for the device when a battery voltage for a battery supplying the first power regulator is greater than a dynamic sleep threshold voltage;
- and
- responsive to the device transitioning to the sleep mode of operation, driving the first power regulator to source the first voltage rail when the battery voltage is less than the dynamic sleep threshold voltage.
A system, comprising:
- a battery;
- a system-on-a-chip (SOC) including at least a first power domain supplied by a first power rail;
- and
- means for managing the first power rail so that the first power rail is collapsed during a sleep mode for the SOC when a battery voltage for the battery is greater than a dynamic sleep threshold voltage and so that the first power rail is sourced during the sleep mode for the SOC when the battery voltage is less than the dynamic sleep threshold voltage.
1 more element
Dependencies are inferred from the claim text.