MCP1755 Low Dropout Regulator (LDO)

The MCP1755/S is a 16 V, high PSRR Low Dropout (LDO) voltage regulator with short-circuit current fold-back. This regulator provides up to 300 mA of output current and accepts a continuous input voltage from 3.6 V to 16 V, making it ideal for automotive and commercial 12 V DC systems. Delivering 80 dB of ripple rejection at 1 kHz, this device is for AC-sensitive applications such as GFCI and AFCI circuit breakers. The current fold-back feature gradually reduces the device current down to 30 mA under short-circuit conditions to protect against damage. When the short is removed, the device will recover and continue operating.

Microchip Direct
Buy here >

Dropout voltage is defined as the input-to-output voltage differential at which the output voltage drops 2% below the nominal value that was measured with a VR + 1.0 V differential applied, where VR is the nominal output voltage

MCP1755/S LDO Features

  • Maximum Input Voltage: 16 V
  • Output Voltage Range 1.8 V – 5 V
  • Output Current: 300 mA for all output voltages
  • Typical Quiescent Current: 68 μA
  • Typical Dropout Voltage at Maximum Iout: 300 mV
  • Packages: 3-pin SOT-23A, 3-pin SOT-89, 5-pin SOT-89, 8-pin 2 × 3 DFN
  •  High noise rejection, typical PSRR 80 dB at 1 kHz
  • High output accuracy, 0.85% typical output range
  • Standard output voltage options: 1.8 V, 2.5 V, 2.8 V, 3.0 V, 3.3 V, 4.0 V, 5.0 V
  • Tight output tolerance of ±2.0 % over entire operating temperature range
  • Stable with minimum 1.0 μF output capacitance
  • Power good output
  • Shutdown input
  • Short-circuit protection with true output current fold-back
  • Over-temperature protection

Package Options

MCP1755 MCP1755S
SOT-23-5 SOT-223-3
SOT-223-5 8-lead 2 x 3 DFN
8-lead 2 x 3 DFN

MCP1755 Applications

Voltage Regulator

MCP1755/S is most commonly used as a voltage regulator for battery-powered applications. In this application example, the input voltage (VIN) ranges from 3.6 V to 4.8 V (Maximum VIN). Typical output voltage (VOUT) is 1.8 V and it can supply maximum 50 mA.


MCP1755S LDO is available as a fixed voltage device.

Current Voltage Reference

The MCP1755/S can be used as a low quiescent current voltage reference. For example, in PIC® Microcontroller applications, the initial accuracy of the reference can be calibrated using production test equipment or by using a ratio measurement. In the application example, a bridge sensor is used for calibration. When the initial accuracy is calibrated, the thermal stability and line regulation tolerance are the only errors introduced by the MCP1755/S. The low-cost, low quiescent current and small ceramic output capacitor are all advantages when using the MCP1755/S as a voltage reference.


Microchip LDO Products Excel Spreadsheet

© 2024 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.