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Power management circuit for STM32F103

harinath
Associate III
Posted on June 01, 2012 at 10:59

Dear all,

I need to design a board based on STM32F103RE.

My board need to be powered in two ways, USB & Li-Ion 3.7V battery. In addition i need to design a IN-BUILT battery charging circuit( USB to Li-Ion battery) for the board. When I attach battery, it should be automatically charged and kept in this state until the other power source (USB or external adapter) is removed and it should AUTOMATICALLY power the board - no jumpers, no switches!

I found the exact functional power_supply section in the following board schematics:

OLIMEXINO-STM32 MAPLE / ARDUINO LIKE DEVELOPMENT BOARD

http://www.olimex.com/dev/DUINO/OLIMEXINO-STM32/OLIMEXINO-STM32.pdf

http://www.olimex.com/dev/DUINO/OLIMEXINO-STM32/OLIMEXINO-STM32_Rev_B.pdf

This  board has 3 power supply options. I need only two of them.

I also have iNEMO v2 Board from ST Microelectronics : 

http://www.st.com/internet/evalboard/product/250367.jsp

It has two power supply options, but a switch is used to select one of them. Moreover, it needs 5V DC supply if USB power not used. 

In my case i want to use 3.7 Li-Ion/Li-Po battery when USB not used. I did not like the switch to select power source.

I liked auto switching power source of  

http://www.olimex.com/dev/DUINO/OLIMEXINO-STM32/OLIMEXINO-STM32.pdf

If it is possible to just remove the DC-DC power supply(power input voltage from 9 to 30V DC) part of OLIMEXINO-STM32 it really suits me.

But i need to use SMD components to make my board as small as possible, like iNEMO v2.

I would like to request if you have any suggestions for me or 

If you think you can solve my problem in few minutes & send circuit diagram, i will be very thankful.

Below are the power management circuits of two boards i mentioned:

http://dl.dropbox.com/u/14046521/Power_management.png

http://dl.dropbox.com/u/14046521/iNEMO_STM32.png

Thank you.

#stm32-power-management
2 REPLIES 2
darla14
Senior
Posted on September 17, 2015 at 13:53

HI, 

Did you suceed in implementing this?Any pointers to the folks here.

Posted on September 17, 2015 at 22:29

We used an LTC4062

http://www.linear.com/product/LTC4062

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