LM350T voltage regulator power supply 3A

adjustable voltage regulator board pcb lm350

LM350T voltage regulator power supply 1.2 -33V 3A. LM350K power supply  Adjustable power supply (source) with integrated circuit LM350 high current. This regulated power supply uses the integrated circuit LM350K (metallic package TO-3) or Lm350T (TO-220) which allows adjusting the output voltage between 1.2 and 33V with currents of up to 3 Amperes.

Lm350T Voltage Regulator Power Supply 1.2 -33V 3A. Lm350K Power Supply  Adjustable Power Supply
Lm350T Voltage Regulator Power Supply 1.2 -33V 3A. Lm350K Power Supply  Adjustable Power Supply
Lm350T Voltage Regulator Power Supply 1.2 -33V 3A. Lm350K Power Supply  Adjustable Power Supply
Lm350T Lm350K Pinout, Datasheet

An accessory that can facilitate your project is to use one of these modules of voltmeter and ammeter with display of LED, evaluatable in electronics stores. If you have the patience, you can even order from China for a price on account.

Digital Ampere Voltage Meter Led Display For Lm350 Lm350T Lm350K
Ampere Voltage Meter Led Display

Circuit diagram for mounting the power supply with CI Lm350

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Circuit Diagram For Mounting The Power Supply With Ci Lm350
Lm350 Adjustable Voltage Power Supply Schematic

Printed Circuit Board Suggestion

Printed Circuit Board Pcb, For Mounting The Power Supply With Ci Lm350
Lm350 Adjustable Voltage Power Supply Pcb
Printed Circuit Board Pcb, Component View For Mounting The Power Supply With Ci Lm350
Lm350 Adjustable Voltage Power Supply Pcb


About LM350

The LM350 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 3A over a 1.2V to 33V output range. They are exceptionally easy to use and require only 2 external resistors to set the output voltage. Further, both line and load regulation are comparable to discrete designs. Also, the LM350 is packaged in standard transistor packages which are easily mounted and handled.

In addition to higher performance than fixed regulators, the LM350T series offers full overload protection available only in IC’s. Included on the chip are current limits, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is accidentally disconnected.

Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors, in which case an input bypass is needed. An output capacitor can be added to improve transient response, while bypassing the adjustment pin will increase the regulator’s ripple rejection.

Besides replacing fixed regulators or discrete designs, the LM150 is useful in a wide variety of other applications. Since the regulator is “floating” and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., avoid short-circuiting the output.

By connecting a fixed resistor between the adjustment pin and output, the LM150 can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground, which programs the output to 1.2V, where most loads draw little current.

The part numbers in the LM150 series which have a NDS suffix are packaged in a standard Steel TO-3 package, while those with a NDE suffix are packaged in a TO-220 plastic package. The LM150 is rated for −55 °C ≤ TJ ≤ +150 °C, while the LM350A is rated for −40 °C ≤ TJ ≤ +125 °C, and the LM350 is rated for 0 °C ≤ TJ ≤ +125 °C.


  • Adjustable Output Down to 1.2V
  • Guaranteed 3A output Current
  • Guaranteed Thermal Regulation
  • Output is Short Circuit Protected
  • Current Limit Constant with Temperature
  • P+ Product Enhancement Tested
  • 86 dB Ripple Rejection
  • Ensured 1% Output Voltage Tolerance (LM350A)
  • Ensured Max. 0.01%/V Line Regulation (LM350A)
  • Ensured Max. 0.3% Load Regulation (LM350A)
  • Output options Adjustable Output
  • Iout (Max) (A) 3
  • Vin (Max) (V) 35
  • Vin (Min) (V) 4.2
  • Vout (Max) (V) 32
  • Vout (Min) (V) 1.25
  • Noise (uVrms) 13
  • Iq (Typ) (mA) 0.05
  • Thermal resistance θJA (°C/W) 35
  • Rating Catalog
  • Load capacitance (Min) (µF) 0
  • Regulated outputs (#) 1
  • Features —
  • Accuracy (%) 1.8
  • PSRR @ 100 KHz (dB) 40
  • Dropout voltage (Vdo) (Typ) (mV) 2300
  • Operating temperature range (C) -40 to 125

BOM to assemble the adjustable power supply.

Last Update: 21/11/2021 20:29

Part Valor Descrição Quantidade
Resistors 1/4W
R1 4.7k/ 0,5W Yellow, violet, red, gold 1
R2 220 Red, red, brown, gold 1
C1 2.200µF/50V Electrolytic Capacitor 1
C2, C5 100nF/50V Ceramic Capacitor 2
C3 10µF/50V Electrolytic Capacitor 1
C6 470µF/50V Electrolytic Capacitor 1
D1, D2 1N4004 Semiconductor diode 2
B1 KBL608 Bridge rectifier 6
IC1 LM350 (Lm350T or LM350K, or LM350AT) Adjustable positive voltage regulator integrated circuit. 1
LED1 Led 5 mm LED, red or other color. 1
POT 4.7K Single potentiometer 1
CN1 AC Terminal block 2 pin 5.08 mm 1
CN2 OUT Terminal block 2 pin 5.08 mm 1
Printed circuit board, solder, wires, knob, transformer as per project, box, heatsink for the LM350, etc.

Download the files for this project, including PDF, PNG, POSTCRIPT, and GERBER board


Download PDF datasheet IC LM350 LM150 LM350A LM350AT

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Xtronic.org blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.

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