LM2596 DC-DC Step-Down CC CV Power Supply Module


This LM2596 Constant Voltage / Constant Current (CC/CV) regulator module is a very flexible and adaptable charging solution that can provide either a Constant Voltage (CV) or Constant Current (CC) output. With a variable output voltage range of 1.25V to 30V and variable output current from 0A to 3A, DC Buck Charger LM2596 is ideal for use as an LED or laser diode current source/driver, a battery charger, a lab current/voltage source, or to regulate the output of solar panels or wind turbines to charge energy storage batteries.

LM2596 Charge Module can charge almost any size of lithium-ion cell to almost any voltage you need. This is an inexpensive way to charge those 4.30v and 4.35v cells, as well as life and many other cells that require different termination voltages. It is also a good way to charge smaller cells since you can almost infinitely adjust the charging current and output voltage.


  • Non-isolated step-down constant current, constant voltage module (CC-CV charging module)
  • Uses Readily Available Standard Inductors
  • Thermal Shutdown and Current-limit Protection
  • Create a Custom Design Using the LM2596



Input voltage7V to 35V. For best efficiency, the output voltage should be about 80% of the input voltage
Output voltageContinuously adjustable from 1.25V to 30V
Minimum Voltage difference (input V – output V)~2V
Maximum output current3A (more than 15W output, please install a heat sink)
Constant current range0A to 3A (adjustable)
Output power15W with natural cooling, 25W with heatsink
Conversion efficiencyUp to 92% (Higher efficiency at higher output voltage)
Full load temperature rise45 °C
No-load CurrentTypical 10mA (12V switch to 4.2V)
Load regulation± 1%
Voltage regulation± 0.5%
Dynamic response speed5% 200uS
Size47mm (L) * 23mm (W) * 14mm (H) mm


  • High-power (up to 3A) LED or laser diode constant current driver
  • Lithium battery charger
  • 4V, 6V, 12V, 14V, or 24V nickel-cadmium or nickel-metal hydride battery charger
  • High Conversion Efficiency When Used with Car 12V Battery Input
  • Adjustable laboratory voltage source or current source
  • Dimming Devices
  • Regulate the Output of solar panels and wind turbines


Download the Datasheet of the LM2596 Power Supply Module from the link given below.