# Power management

## Voltage regulators

### Linear

Generally indicated with a code like L78XXCV, where XX indicated the Vout voltage.

An important value to look at in the datasheet is the **drop voltage** that indicates
what is the minimum difference between the Vin voltage and the Vout in order to maintain
a stable voltage.

![voltage regulator schematic](Images/voltage-regulator-scheme.png)

 - [Video](https://www.youtube.com/watch?v=GSzVs7_aW-Y) about linear voltage regulators
 - [Tutorial sparkfun](https://www.sparkfun.com/tutorials/103)
 - http://www.slideshare.net/niiraz/voltage-regulator-29002693
 - http://datasheet.octopart.com/L7805CV-STMicroelectronics-datasheet-7264666.pdf
 - Buck converter vs. linear voltage regulator - practical comparison [youtube](https://www.youtube.com/watch?v=giGRrODKJSE)

### Switching

 - http://web.eecs.utk.edu/~dcostine/ECE481/fall2013/lectures/L2_out.pdf
 - [DC-DC Power Converters](http://www.eng.auburn.edu/~agrawvd/COURSE/READING/LOWP/Erikson_DC_2_DC.pdf)

### Boost

Steps up the voltage

 - [Video](https://www.youtube.com/watch?v=wJU7AJgERG8&index=5&list=PL36AB5C6DA12CF293) from Afrotechmods
 - [TPS61040](http://mkpochtoi.narod.ru/TPS61040_TPS61041_dcdc_boost_ds.pdf) datasheet
 - [TPS61093](http://www.ti.com/lit/ds/symlink/tps61093.pdf) datasheet

### Buck

Step down the voltage

 - [Video](https://www.youtube.com/watch?v=CEhBN5_fO5o&index=5&list=PL36AB5C6DA12CF293) from Afrotechmods
 - [Iphone charger teardown](http://www.righto.com/2012/05/apple-iphone-charger-teardown-quality.html)

## Battery charger

 - [MCP73831/2](https://www.sparkfun.com/datasheets/Prototyping/Batteries/MCP73831T.pdf) datasheet
 - [LTC4054](https://cds.linear.com/docs/en/datasheet/405442xf.pdf) datasheet
 - [A Lithium Battery Charger with Load Sharing](http://blog.zakkemble.co.uk/a-lithium-battery-charger-with-load-sharing/)
 - [AN1149](http://ww1.microchip.com/downloads/en/AppNotes/01149c.pdf) Designing A Li-Ion Battery Charger and Load Sharing System With
Microchip’s Stand-Alone Li-Ion Battery Charge Management Controller