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Home : Endded Products : Adapter/Charger : Power Adapter :

3A DC to DC Step-down Power Module, IN:up to 23V,OUT:0.925 - 20V

(323 vote(s))
Price: US $0.95

Item From:Shanghai China
Product code: KIS-3R33S
In stock: yes
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3A DC Synchronous Rectified Step-Down Module, give you higher efficiency than regular Asynchronous module

We sell it at so low price is due to it is used part, but was tested before shipping

  • Condition: USED, Tested, not brand new
  • Biuld in MP2307DN (datasheet)
  • These modules are widely used on:
    • Distributed Power Systems
    • Networking Systems
    • FPGA, DSP, ASIC Power Supplies
    • Green Electronics/Appliances
    • Notebook Computers
  • Size (L x W x H): Approx. 21 x 20 x 7mm
  • Input Voltage: 4.75 - 23V DC
  • Output Voltage: 3.3V (can be modified to 0.925 - 20V)
  • Efficiency: Up to 95%
  • Output Current: Rated 3A, max up to 4A peak
  • Internal Frequency: Fixed 340KHz
  • Protection: Cycle-by-cycle over current protection

The typical application for MP2307 is (not real circuit in KIS-3R33S):

As you can see, you just need to change the ratio of: (R1+R2)/R2, the output voltage is(V): (R1+R2)/R2 * 0.925, the output voltage range is 0.925 - 20V.

The following diagram is for KIS-3R33S module, the default output voltage of this module is: 3.3V (note: R3=R4=51K, R5=10K, Vout=((R3|R4+R5)/R5) * 0.925), connect the ADJ pin to GND via a resistor will raise the output up to to 10.43V (resistor is 0), connect ADJ pin to Vout via a resistor will low the output to 1.21V (resistor is 0), so use the ADJ pin can adjust the output from 1.21V to 10.43V, if you want a full range of output, you need modify this module as picture 3rd.

modify the module like follow and get full range of output (0.925 to 20V):


  • We will send payment cleared orders out of our facility within 2 working days to HongKong/ShangHai Post Office, the post office needs 1 to 3 working days to sort and process international parcels,
  • We ship to your Paypal address only!!, please verify your Paypal address before sending payment,
  • Estimate Delivery time, except public holiday in China and your country
    If you can't wait the described time, please don't buy it from us):
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