1. Voltage Regulator Board
Project Direction Report
David Hoskins
Josh Chapman

2. Objectives Regulate voltages for 5v and 5.1v Monitor Current
Ability to shut off channels
Create PCB that holds components in a 10 cm x 10 cm area (CubeSat standard)

3. Done So Far
95% of
Schematic

4. Battery

5. Voltage Regulator
Part #: LM317

6. Current Sensor
Part #: INA169NA/3K

7. Microcontroller
Part #: Atmega328

8. Inverter
Part #: MM74HC14MX

9. Power Mosfet
Part #: SI4204DY-T1-GE3

10. Logic Level Converter
Part #: BSS138

11. Output Connector

12. Setbacks Voltage of regulator drops at currents above rating (1.5A)
We have limited ADC pins on the ATMEGA328
Voltage for imaging experiment needs 5.1–5.2v

13. Tactics Measure regulator output voltage for shutoff decision
Use multiplexer to switch ADC inputs from voltage regulator output to current sensor
Use different resistor values for the voltage divider in the voltage regulator circuit

14. What Is Left? Add pull down resistors to schematic
Add multiplexer to schematic
Add battery connector to schematic
Order resistors (pull down), multiplexer, and battery connector
Design PCB layout and routing
Order PCB
Populate PCB with components