Organize and Share your Electronics the way you want. Sign-Up for a free account now. It takes only 30 seconds!

How to make 5V from 1.5V

How to make 5V from 1.5V

In many cases can be very handy to be able to convert 1.5V to 5V. Then you can power microcontroller or LED from a single AA or AAA battery. It is simple to do this as there are special IC’s as MAXIM MAX1674 or MAX7176. This is step-up DC-DC converter that can convert voltages from 0.7V to any in range from 2V to 5.5V. MAX1676 have already preset pins for 3.3V and 5V, that makes easer integration in 3.3 and 5V circuits. IC can dissipate up to 444mW.

Bellow is a circuit that converts 1.5V to 5V.

5vconv-ckt

Lets say wee need to get maximum output current 300mA, then wee need to put some efforts. Because output power is 5V·0.3A=1.5W. Lets say efficiency is 100% then the power drawn from battery will be 1.5W too. At 1.5V voltage this will be 1A current. Not all batteries can drive such currents. Other important part is inductor. For this wee need inductor with high current saturation which usually leads to increase of size.

  • If current is over 300mA, then inductor inductance 47uH;
  • If current is over 120mA, then inductor inductance 22uH;
  • If current is over 70mA, then inductor inductance 10uH;

You will find recommended inductors in datasheet.

In this case if FB pin of MAX1614 is connected to ground, then output voltage is equal to 5V. If FB would be connected to OUT pin then output voltage would be 3.3V. If put voltage between OUT and ground, then we can control output voltage in range from 3.3V to 5V.

Biggest real efficiency of IC is at 120mA – 94%.

Manufacturer recommends to design PCB with sort and thick traces. Inductor should have minimal resistance.

5vconv-pic1

Real device shows really big efficiency at high loads. Circuit and PCB is really compact allowing to make small designs.

 5vconv-pic2

In the picture above you can see how circuit works with LED Luxeon without current limiting resistor. Circuit is powered with 1.5V Kodak battery. This circuit can be used for powering LED flashlights, emergency cell phone charging, making compact embedded designs with microcontrollers, bugs.

Original source: www.radiokot.ru

Visit Here for more.







 

More Articles to Read

Gesture Controlled Smart Home
Gesture Controlled Smart Home
Design for a Wideband, Differential Transimpedance DAC Output
Design for a Wideband, Differential Transimpedance DAC Output
Wrist thrusters let you fly through the water effortlessly
Wrist thrusters let you fly through the water effortlessly
Bertan/Spellman 225-20R HV power supply teardown
Bertan/Spellman 225-20R HV power supply teardown
Blinking Christmas Lights
Blinking Christmas Lights
Adjusting clock with alarm, hygrometer & thermometer on 1.8″ ST7735 display
Adjusting clock with alarm, hygrometer & thermometer on 1.8″ ST7735 display
Adding an “extra sense” with rangefinders
Adding an “extra sense” with rangefinders
This wireless game controller looks like a rug
This wireless game controller looks like a rug
How to run your ESP8266 for years on a battery
How to run your ESP8266 for years on a battery
Calibration of a 3-Phase Energy Meter Board on the ADE7754
Calibration of a 3-Phase Energy Meter Board on the ADE7754
Making beats on a tiny Arduino DJ controller
Making beats on a tiny Arduino DJ controller
Qinsi-QS5100 Sn63Pb37 solder profile
Qinsi-QS5100 Sn63Pb37 solder profile
Water Detection System
Water Detection System
Professional Hi-Fi 15W Tube Amplifier circuit
Professional Hi-Fi 15W Tube Amplifier circuit
This Arduino machine will judge how sick your ollies are
This Arduino machine will judge how sick your ollies are
Turn an old payphone into a boombox for ’90s hits
Turn an old payphone into a boombox for ’90s hits
Big F’n 3D printer build
Big F’n 3D printer build
Temperature alarm for boiling milk
Temperature alarm for boiling milk
QuadBot is a 3D-printable walking robot for everyone
QuadBot is a 3D-printable walking robot for everyone
MicroConverter I2C Compatible Interface
MicroConverter I2C Compatible Interface

Top


Shares