I am building a custom Atmel Mega 2560 PCB that will run off the 9V 600mAh rechargeable li-ion batteries in a bus. I need to supply - 5V for MCU and other components in PCB, the overall current consumption being 2000mA. I use Arduino Mega 2560 before with XBEE wireless and some sensors, the board fail to deliver the require power so that’s why I want to design my own custom board with some change in components.
The is more than one type of Voltage Regulators, I use Digi key website as an electronics wiki to discover electronic elements and components and I see these type of voltage regulators:-
- PMIC - Voltage Regulators - DC DC Switching Controllers
- PMIC - Voltage Regulators - DC DC Switching Regulators
- PMIC - Voltage Regulators - Linear
- PMIC - Voltage Regulators - Linear + Switching
- PMIC - Voltage Regulators - Linear Transistor Driver
- PMIC - Voltage Regulators - Special Purpose
Mega 2560 use NCP1117ST50T3G to drive 9v to 5v with 800mA output current There is another AVR board based on Arduino Mega 2560 call Freaduino Mega2560 and its use MP2307 as a voltage regulator this chip is not linear voltage regulator like NCP1117ST50T3G which used it original Mega 2560 its DC DC Switching Regulators and its provide 5v with 2000mA output current but it’s use many pins not like linear regulators and I read in Digi Key it has frequency can someone explain the difference between DC DC Switching Regulators and not linear voltage regulator.
I continue my search in Digi key and custom my search for 5v, 3A output current in Voltage Regulators and find these items
My questions are as follows:
If I use any one of these 3A regulator in my circuit will it heat up or not.
Is it safe if I use Two 9V battery 600mA and connect it in parallel mode to increase the ampere to 1200mA will this work fine with regulator or these batteries with their output current will not enough to provide 5v with 3A output current.
Do I need to use heat sink or not?
last not least can someone explain the purpose and usage or these type of voltage regulator which I've listed it above and which type is the perfect for MCU board.
Thank you very much for your help.