Abstract: Certain aspects of the present disclosure provide techniques and apparatus for supplying power, including battery charging. One example power supply circuit generally includes a switching regulator including an output node; a first battery node for coupling to a first battery; a second battery node for coupling to a second battery; a first switch coupled between the output node of the switching regulator and the first battery node; and a second switch coupled between the output node of the switching regulator and the second battery node. Such a power supply circuit may independently control and monitor the charging of multiple independent batteries without using multiple chargers, may balance the batteries during discharging, and may operate without a current limit switch.

Abstract: Certain aspects of the present disclosure provide techniques and apparatus for supplying power. One example power supply circuit generally includes a switching regulator including an output coupled to a first power supply rail for coupling to a first load and to a second power supply rail for coupling to a second load, a battery node for coupling to a battery, a switch coupled between the battery node and the second power supply rail, and a logic circuit including a first input coupled to the first power supply rail, a second input coupled to the second power supply rail, and an output coupled to a control input of the switch, the logic circuit being configured to control closing of the switch when a voltage of the first power supply rail falls below a first threshold voltage or a voltage of the second power supply rail falls below a second threshold voltage.

Abstract: Techniques and apparatus for supplying power, including battery balancing and isolating. One example power supply circuit generally includes a first battery node for coupling to a first battery, a second battery node for coupling to a second battery, and a switch circuit coupled between the first battery node and the second battery node and disposed on a same integrated circuit (IC) die as the first battery node and the second battery node. The power supply circuit may be configured to balance the first battery and the second battery without a resistor (e.g., a resistor external to the IC die on which the power supply circuit resides).

Abstract: Certain aspects of the present disclosure provide techniques and apparatus for supplying power, including battery charging. One example power supply circuit generally includes a switching regulator including an output node coupled to a power supply node, a battery node for coupling to a battery, a first transistor including a drain coupled to the power supply node, a second transistor including a source coupled to a source of the first transistor and a drain coupled to the battery node, a first current sense circuit coupled to the drain of the first transistor, and a second current sense circuit coupled to the drain of the second transistor.

Abstract: Certain aspects of the present disclosure provide techniques and apparatus for supplying power. One example power supply circuit generally includes a switching regulator including an output coupled to a first power supply rail for coupling to a first load and to a second power supply rail for coupling to a second load, a battery node for coupling to a battery, a switch coupled between the battery node and the second power supply rail, and a logic circuit including a first input coupled to the first power supply rail, a second input coupled to the second power supply rail, and an output coupled to a control input of the switch, the logic circuit being configured to control closing of the switch when a voltage of the first power supply rail falls below a first threshold voltage or a voltage of the second power supply rail falls below a second threshold voltage.

Abstract: Certain aspects of the present disclosure are directed towards techniques and apparatus for battery soft start. An example method generally includes: detecting connection of a first battery, wherein a first transistor is coupled between the first battery and an output node of a power supply circuit for the electronic device, and wherein an output capacitive element coupled to the output node; biasing the first transistor in a soft start operating mode to charge the output capacitive element based on the detection; detecting connection of a second battery, wherein a second transistor is coupled between the second battery and the output node; comparing a first battery voltage (VBAT) of the first battery and a second VBAT of the second battery; and biasing the first transistor in a second operating mode based on the comparison and an output voltage at the output node.

Abstract: Techniques and apparatus for soft starting power supply voltages in a power supply circuit for multiple batteries. One example power supply circuit generally includes a switching regulator including an output selectively coupled to at least one of a first power supply rail or a second power supply rail, a first battery node for coupling to a first battery, a second battery node for coupling to a second battery, a first set of transistors coupled between the first power supply rail and the first battery node, a second set of transistors coupled between the second power supply rail and the second battery node, a voltage regulator (VR), and a charge pump (CP) circuit. The CP circuit generally includes a first terminal coupled to the first power supply rail, a second terminal coupled to the second power supply rail, and a power supply input coupled to an output of the VR.

Abstract: Certain aspects of the present disclosure are directed towards techniques and apparatus for battery charging. An example method generally includes: performing at least one first charging operation for each of a first battery and a second battery; detecting a first voltage associated with the first battery and a second voltage associated with the second battery; comparing the first voltage and the second voltage to detect whether the first voltage and the second voltage are balanced; and performing a second charging operation for one of the first battery and the second battery to balance the first voltage and the second voltage based on the comparison.

Abstract: Certain aspects of the present disclosure provide techniques and apparatus for supplying power, including battery charging. One example power supply circuit generally includes a switching regulator including an output node, a first power supply node coupled to the output node of the switching regulator, a first charge pump including a first terminal coupled to the first power supply node and including a second terminal coupled to a second power supply node, a first battery node for coupling to a first battery, and a first switch including a first terminal coupled to the first power supply node and including a second terminal connected to the first battery node.

Abstract: Certain aspects of the present disclosure provide techniques and apparatus for supplying power, including battery charging. One example power supply circuit generally includes a switching regulator including an output node; a first battery node for coupling to a first battery; a second battery node for coupling to a second battery; a first switch coupled between the output node of the switching regulator and the first battery node; and a second switch coupled between the output node of the switching regulator and the second battery node. Such a power supply circuit may independently control and monitor the charging of multiple independent batteries without using multiple chargers, may balance the batteries during discharging, and may operate without a current limit switch.