Summit Microelectronics | Date: 2010-11-15
Embodiments of the present invention include circuits and methods for sensing resistance. In one embodiment, a current is generated into a node. The node is coupled to a first terminal of a resistor. A second terminal of the resistor is coupled in series with a capacitance and a reference voltage. The current is turned off when a voltage on the node meets a threshold. A second voltage is detected on the node after the current is turned off. A resistance value is determined based on the first voltage on the node and the second voltage on the node. In one embodiment, the resistor is external to an integrated circuit and sensed through a single pin of the integrated circuit. The integrated circuit may include a current source, comparator, and a digital-to-analog converter.
Summit Microelectronics | Date: 2011-08-16
Embodiments of the present invention include systems and methods of controlling power in battery operated systems. In one embodiment, the present invention includes a switching regulator for boosting voltage on a depleted battery to power up a system. The system may communicate with an external system to increase the current received from the external system. Embodiments of the present invention include circuits for controlling power received from external power sources such as a USB power source. In another embodiment, input-output control techniques are disclosed for controlling the delivery of power to a system or charging a system battery, or both, from an external power source.
Summit Microelectronics | Date: 2010-08-25
Embodiments of the present invention include charge pump circuits and methods. In one embodiment, a first charge pump receives a voltage and generates a first charge pump output voltage and current for supplying the power requirements of a circuit. A second charge pump is coupled in series with the first charge pump. The second charge pump generates a second charge pump output voltage and current for supplying different power requirements of the circuit. In one embodiment, the first charge pump provides a high current low voltage output to a first circuit and the second charge pump provides a low current high voltage output to a second circuit. Capacitors of the first charge pump may be external to an integrated circuit and capacitors of the second charge pump may be internal to the integrated circuit.
Summit Microelectronics | Date: 2012-07-23
A switching regulator circuit includes a power stage and a compensation network. The compensation network includes a programmable transconductance (g
News Article | February 15, 2013
Qualcomm has revealed that its latest chipset, which is already in use in 70 smartphones and tablets, includes a new technology called Quick Charge 1.0. The technology allows batteries to charge much faster than otherwise possible. The chipset maker states that a smartphone battery might take more than four hours to charge fully under normal circumstances. However, thanks to Quick Charge, the same battery can be charged up to 40 percent faster. Already, USB 3.0 ports on PCs allow phones to charge faster, but it is surprising that Qualcomm had kept such a feature under wraps till now. The phones that have the Quick Charge feature have been available in the market for many months. “A phone with Qualcomm Quick Charge 1.0 can charge up to 40% faster than older phones. A phone without Quick Charge 1.0 could be stuck plugged in charging for more than four hours. With Quick Charge 1.0, the same phone can reach its full charge in three hours or less. The less time you spend charging your mobile device, the more time you get to use it; your mobile device becomes truly mobile,” Qualcomm revealed in an official blog post. The post further said, “Quick Charge 1.0 is offered to our customers as an integrated solution (as part of the PMIC, or power management integrated circuit) and a standalone solution that interfaces to the USB connector. Any phone or tablet’s charging port can be enabled with Quick Charge.” According to the blog, Qualcomm acquired this technology when it bought over Summit Microelectronics in June 2012. According to a press release issued at the time, the company entered this decision to meet “the demand for more sophisticated battery management”. “Summit Microelectronics is a leader in providing flexible, highly integrated power management solutions combining precision power regulation with sophisticated digital control in a single chip. In particular, the company’s fast charging solutions are found in a variety of leading mobile phones, tablets, and e-readers,” the press release said. The company also released a list of devices which have Qualcomm Quick Charge 1.0 support. The list includes high-end devices like the HTC Butterfly, HTC One S, LG Optimus G, Nexus 4, Motorola’s Droid RAZR HD, Droid RAZR M and Droid RAZR Maxx HD; Samsung’s Galaxy S III (US version), Galaxy Tab 2 10.1 (LTE), Galaxy Tab 2 7.0 (LTE) and Sony’s Xperia T and Xperia V phones.