Buck-boost converter extends usable life of Li-ion batteries

17th October 2014
Posted By : Siobhan O'Gorman
Buck-boost converter extends usable life of Li-ion batteries

Designed to prolong battery life in single-cell Li-ion battery applications where the output voltage is within the battery voltage range, the XC9306 converter has been released by Torex Semiconductor. When discharged, a Li-ion battery's operating voltage declines to the point that it can no longer power it's load. The synchronous buck-boost converter boosts the output voltage of the battery, extending it’s usable life.

By using the remaining charge of the Li-ion battery, the converter extends it’s life more efficiently. Reducing the overall mounting area by as much as 50%, the XC9306 uses a 6MHz switching frequency which allows for a smaller inductor and capacitors. To obtain maximum efficiency, the buck-boost converter operates in fixed frequency PWM mode (MODE pin: “High”) using synchronous rectification. To maintain high efficiency over a wide load current range, the converter can be switched over to Power Save mode (MODE pin: “Low”) at low load currents.

The device has a 2.5-5.5V voltage range and allows input current to be limited to a typical value of 3.1, 1.3 or 0.49A. Maximum output currents of 1.2 (Buck PWM Mode) and 0.8A (Boost PWM Mode) are supported by the buck-boost converter.

Using an external resistor divider in the range 0.8-5.0V, the output voltage can be programmed. For applications that require a lower chipset core voltage during standby, the VSEL pin can be used to select a second output voltage level. Measuring 2.15x1.94x0.625mm, the XC9306 synchronous buck-boost converter is offered in the WLP-20-01 package.


You must be logged in to comment

Write a comment

No comments

Sign up to view our publications

Sign up

Sign up to view our downloads

Sign up

Girls in Tech | Catalyst | 2019
4th September 2019
United Kingdom The Brewery, London
DSEI 2019
10th September 2019
United Kingdom EXCEL, London
EMO Hannover 2019
16th September 2019
Germany Hannover
Women in Tech Festival 2019
17th September 2019
United Kingdom The Brewery, London
European Microwave Week 2019
29th September 2019
France Porte De Versailles Paris