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Fig. 1 - 5A, 1.22V to 26V, 500kHz Step-Down Converter Using RT8289 IC with PCB |
General IC Description
Features
- High Output Current up to 5A
- Internal Soft-Start
- 100mΩ Internal Power MOSFET Switch
- Internal Compensation Minimizes External Parts Count
- High Efficiency up to 90%
- 25μA Shutdown Current
- Fixed 500kHz Frequency
- Thermal Shutdown Protection
- Cycle-by-Cycle Over Current Protection
- Wide 5.5V to 32V Operating Input Range
- Adjustable Output Voltage from 1.222V to 26V
- Available in an SOP-8 (Exposed Pad) Package
- RoHS Compliant and Halogen Free
Output Voltage Setting
- VOUT = VREF *(1 + (R1/R2))
- Where VREF is the reference voltage (type 1.222V).
- Where R1 = 10kΩ.
General Formula:
- VOUT = VREF *(1 + R1/R2)
- Where VREF is the reference voltage (type 1.222V).
- Where R1 = 10kΩ.
For a 3.3V output, our formula would look like:
- Vout = 1,222 * (1+ (10/5.8))
- Vout = 3.328V
For a 5V output, our formula would look like:
- Vout = 1,222 * (1+ (10/3.16))
- Vout = 5,089V
For a 9V output, our formula would look like:
- Vout = 1,222 * (1+ (10/1.57))
- Vout = 9,005V
For a 12V output, our formula would look like:
- Vout = 1,222 * (1+ (10/1.13))
- Vout = 12,036V
For a 26V output, our formula would look like:
- Vout = 1,222 * (1+ (10/0.493))
- Vout = 26,009V
The Circuit Schematic
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Fig. 2 - Schematic 5A, 1.22V to 26V, 500kHz Step-Down Converter Using RT8289 IC |
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.
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