Ultra-low quiescent LDO extends battery life for sensors and portable designs

Ultra-low quiescent LDO extends battery life for sensors and portable designs

With ultra-low quiescent current of 250 nA, the MCP1811 enables battery life which is four-times longer than conventional ultra-low Iq LDO regulators. Compact packages down to 1 x 1 mm also help the MCP1811 to minimise board space.

The MCP1811/12 devices are 150 mA (MCP1811) and 300 mA (MCP1812) low dropout (LDO) linear regulators that provide high-current and low-output voltages while maintaining an ultra-low 250 nA of quiescent current during device operation. In addition, the MCP1811B/12B can be shut down for 5 nA (typical) supply current draw.

The MCP1811/12 family comes in nine standard fixed output-voltage versions: 1V, 1.2V, 1.8V, 2.0V, 2.5V, 2.8V, 3.0V, 3.3V, and 4.0V. The 150/300 mA output current capability, combined with the low output-voltage capability, make the MCP1811/12 device family a good choice for new ultra-long-life LDO applications that have high-current demands, but require ultra-low power consumption during sleep periods.

The MCP1811/12 is stable with ceramic output capacitors that inherently provide lower output noise and reduce the size and cost of the entire regulator solution. Only 1 μF (2.2 μF for MCP1812) of output capacitance is needed to assure the stability of the system with a low noise output.

Block Diagram


Additional Features

  • Ultra-Low Quiescent Current: 250 nA (typical)
  • Ultra-Low Shutdown Supply Current: 10 nA typ (MCP1811A) and 5 nA typ (MCP1811B)
  • Input Voltage Range: 1.8V to 5.5V
  • Standard Output Voltages: 1.0V, 1.2V, 1.8V, 2.0V, 2.5V, 2.8V, 3.0V, 3.3V and 4.0V
  • Low Dropout Voltage: 400 mV (typical) w/ Small Variation Over Load Range
  • Stable with Ceramic Output Capacitor: 1.0 uF
  • Overcurrent Protection w/ Foldback
  • Output Discharge (MCP1811A)
  • Available in 3 and 5 lead SOT-23, 3 and 5 lead SC70, 4 lead 1x1mm UDFN

The MCP1811/12 can be paired with other ultra-low current devices, such as Microchip’s nanoWatt eXtreme Low Power (XLP) technology devices, for a complete ultra-low-power solution.

more info: www.microchip.com

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Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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