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SGM2019 Linear Voltage Regulator

The SGM019 series are low-power, low-noise, low-dropout CMOS linier voltage regulator from SGMicro. They are available in nine fixed voltage (1.2V, 1.5V, 1.8V, 2.5V, 2.6V, 2.8V, 2.85V, 3.0V and 3.3V) output variants and an adjustable variant (Adjustable Output from 1.2V to 5.0V). Very low quotient current and shutdown mode current(10nA) makes it perfect for battery powered systems. It can provide a current up to 300mA with a very low dropout voltage of 270mV. Applications such as RF systems can also benefit from the SG2019’s ultra-low output noise (30µVRMS) and high PSRR. An external noise bypass capacitor connected to the device’s BP pin can further reduce the noise level. The SGM2019 is available in both SOT-23-5 and SC70-5 packages.

SGM2019 Pinout Configuration

1 IN Regulator Input. Supply voltage can range from 2.5V to 5.5V. Bypass with a 1μF
capacitor to GND.
2 GND Ground.
3 EN Shutdown Input. A logic low reduces the supply current to 10nA. Connect to IN for
normal operation.
4 BP Reference-Noise Bypass (fixed voltage version only). Bypass with a low leakage
0.01μF ceramic capacitor for reduced noise at the output.
  FB Adjustable Voltage Version Only. This is used to set the output voltage of the device.
5 OUT Regulator Output.

How to Identify SG2019 Variant

SG2019 Circuit Variant Image

SG2019 LDOs comes with the marking in the following format YJxx, where xx indica Ground. tes the output voltage. For example, for 3.3V variant the marking will be YJ33. Similarly for 1.8V variant the marking will be YJ18.


  • Operating Input Voltage Range: 2.5V to 5.5V
  • Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2.5V, 2.6V, 2.8V, 2.85V, 3.0V, 3.3V
  • Adjustable Output Voltage Range: 1.2V to 5.0V
  • Output Voltage Accuracy: ±2.5% at +25℃
  • Low Output Noise: 30μVRMS (TYP)
  • Low Dropout Voltage: 270mV (TYP) at 300mA
  • High PSRR: 74dB (TYP) at 1kHz
  • Shutdown Current: 0.01μA (TYP)
  • Thermal Shutdown Protection
  • Output Current Limit
  • -40℃ to +85℃ Operating Temperature Range
  • Available in Green SC70-5 and SOT-23-5 Packages 

SGM2019 Equivalents

AP2112, LD2985, TPS73633, TLV713

SGM2019 Alternatives

LP2985, AMS1117, MIC5225, MIC5205, RT9193

Note: Complete technical details can be found in the SGM2019 datasheet at this page’s end.

Application Circuit

The following image shows the typical application circuit for the SGM2019

SG2019 Circuit Diagram

As you can see the circuit is very simple and only requires bare minimum components. 1Uf capacitors are used for input and output filtering. A 100nF capacitor is connected to the BP pin for noise reduction. With adjustable variant, the bypass capacitor on BP/FB pin will be replaced with a voltage divider from the output, to set the output voltage.


  • Cellular Telephones 
  • Cordless Telephones 
  • PCMCIA Cards 
  • Modems  
  • MP3 Player 
  • Hand-Held Instruments 
  • Palmtop Computers 
  • Electronic Planners 
  • Portable/Battery-Powered Equipment 

2D-Model and Dimensions

Below is the 2D CAD drawing of SGM2019 along with its dimensions in millimeters. The dimensions can be used to create custom footprints of the module and be used for PCB or CAD modelling.

SOT-23-5 Model Image

SC70-5 Model Image

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