The LTP33xx family of low-dropout (LDO), low-power linear regulators offers very high power supply rejection ratio (PSRR) while maintaining very low 40μA ground current, suitable for RF applications. The family uses an advanced CMOS process and a P-MOSFET pass device to achieve fast start-up, very low noise, excellent transient response, and excellent PSRR performance. The LTP33xx is stable with a 1.0μF ceramic output capacitor, and uses a precision voltage reference and feedback loop to achieve a worst-case accuracy of 2% over all load, line, process, and temperature variations. It is fully specified from TJ=–40ºC to +125ºC, and is offered in a tiny DFN1×1-4, UTDFN1×1-4 and SOT23-5/SC70-5, and SOT23-3/SOT-89 packages, which are ideal for small form factor portable equipments such as wireless handsets and PDAs. The LTP33xx is available in standard fixed output voltages of 1.1V, 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 3.6V and custom voltage options (50mV step options between 0.8V and 5.0V are available upon request).

Advantages And Characteristics

  • Wide Input Voltage Range: 2.5 to 6.0V
  • Up to 300mA Load Current
  • Standard Fixed Output Voltage Options: 1.1V, 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V and 3.6V
  • More Output Voltage Options Available on Request
  • Ultra Low Dropout: 260mV at 300mA Load
  • Low Noise: 70μVRMS at 2.8V output
  • Ultra-Fast Start-Up Time: 25µs
  • Excellent Load and Line Transient Response
  • Line Regulation: 0.03% Typically
  • With Auto Discharge
  • Shutdown Version Available in DFN1×1-4, UTDFN1×1-4, SOT23-5 and SC70-5 Packages
  • Normal Version Available in SOT23-3 and SOT-89 Packages


  • Smart Phones and Cellular Phones
  • Modems
  • Security and Surveillance
  • Portable Devices
  • Battery-Powered Equipments
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