Power management ups runtime
26 February 2008
Multi-function power management for Li-Ion/Polymer batteries maximises runtime.
The LTC3566 from Linear Technology is a switch-mode USB power manager with an always-on LDO and integrated 1A buck-boost regulator, to maximise battery runtime and minimise heat. It has a switchng PowerPath manager, a standalone battery charger, a 1A synchronous buck boost regulator in a 4mm x 4mm QFN package.
This low-profile device manages power flow between multiple input sources such as a wall adaptor or USB port, and the Lithium battery. In addition, its instant-ON operation ensures power to the system load, even with a dead battery. For fast charging, the LTC3566’s switching input stage converts nearly all of the 2.5W available from the USB port to charging current, enabling up to 700mA from a 500mA limited USB supply and up to 1.5A when wall powered.
The synchronous buck-boost regulator can deliver up to 1A continuously and is ideal for efficiently regulating a 3.3V output voltage over the full Lithium battery voltage range, down to 2.75V input. The 2.25MHz switching frequency allows the use of tiny low cost capacitors and inductors less than 1mm in height. Furthermore, the regulators are stable with ceramic output capacitors, achieving very low output voltage ripple.
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