Saturday, February 26, 2022

4A Low-Noise High-Frequency Step-Up DC-DC Converter using MAX1709 with PCB

Fig. 1 - 4A Low-Noise High-Frequency Step-Up DC-DC Converter using MAX1709 with PCB

This is a DC-DC converter circuit that uses a MAX1709 series Integrated Circuit as the main component, it works with a Step-Up conversion system.

This powerful microcircuit is able to work with very few external components and deliver a fixed 3.3V or 5V or adjustable 2.5V to 5.5V voltage, with 4 Amperes of output current.

Integrated Circuit General Description

The MAX1709 sets a new standard of space savings for high-power,  step-up  DC-DC  conversion.  It  delivers  up to  20W  at  a  fixed  (3.3V  or  5V)  or  adjustable  (2.5V  to5.5V)  output,  using  an  on-chip  power  MOSFET  from  a +0.7V to +5V supply. 

Fixed-frequency PWM operation ensures that the switching noise spectrum is constrained to the 600kHz fundamental and its harmonics, allowing easy post filtering  for  noise  reduction.  

External  clock  synchronization capability  allows  for  even  tighter  noise  spectrum  control. Quiescent power consumption is less than 1mW to extend operating time in battery-powered systems. 

Two  control  inputs  (ONA ONB)  allow  simple  push-on, push-off  control  through  a  single  momentary  push button  switch,  as  well  as  conventional  on/off  logic  control. 

The  MAX1709  also  features  programmable  soft-start and current limit for design flexibility and optimum performance with batteries. 

The maximum RMS switch cur-rent  rating  is  10A.  For  a  device  with  a  lower  current rating, smaller size, and lower cost, refer to the MAX1708 datasheet.

The Circuit Schematic

In Figure 2, below, we can see the schematic diagram of 4A Low-Noise High-Frequency Step-Up DC-DC Converter using MAX1709.

The circuit is simple to assemble, there are few external components, and there is no need for adjustment, once assembled, it is ready to work, if everything is correct, of course!

The PCB tracks are bent, the main ones have their tracks at the bottom and at the top of the PCB, because the current is 4 amperes.

The capacitors are tantalum, however if you can't find them, electrolytic capacitors can be used, however for more sensitive circuits, the performance may not be as expected, but in most circuits they work very well.

The DC-DC converter supports input from 0.7V up to 5V, and at the output it maintains the stabilized voltage of 5V, however to get the promised 4 Amps, it is necessary to have at least 3.3V at the input.
Fig. 2 - Schematic Circuit 4A Low-Noise High-Frequency Step-Up DC-DC Converter using MAX1709

Components List

  • Semiconductors
    • U1 ...... MAX1709 SMD Integrated Circuit
    • D1 .....  B520C SMD Schottky Diode 5A

  • Resistor
    • R1 ..... 312KΩ SMD resistor (orange, brown, red, orange, gold
    • R2 ..... 2Ω SMD resistor (red, black, black, gold)
  • Capacitor
    • C1, C2, C6, C7 ... 150uF SMD Tantalum Capacitor
    • C3 ....................... 10nF SMD Ceramic Capacitor
    • C4 ....................... 220nF SMD Ceramic Capacitor
    • C5 ....................... 100nF SMD Ceramic Capacitor

  • Miscellaneous 
    • L1 .......... 1uH 5A SMD Inductor
    • P1, P2 .... 2-pin PCB soldering terminal blocks (Optional)
    • Others .... Printed Circuit Board, wires, etc.

Printed Circuit Board

In Figure 3, we provide the PCB - Printed Circuit Board, in GERBER, PDF and PNG files. These files are available for free download, on the MEGA server, in a direct link, without any bypass. 

All to make it easier for you to do a more optimized assembly, either at home, or with a company that prints the board. You can download the files in the Download option below.
Fig. 3 - PCB - 4A Low-Noise High-Frequency Step-Up DC-DC Converter Using MAX1709

Files to download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

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