SNVS247E September   2003  – August 2016 LP3875-ADJ

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Shutdown (SD)
      2. 7.3.2 Short-Circuit Protection
      3. 7.3.3 Dropout Voltage
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Active Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Reverse Current Path
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  External Capacitors
        2. 8.2.2.2  CFF (Feed Forward Capacitor)
        3. 8.2.2.3  Selecting a Capacitor
        4. 8.2.2.4  Capacitor Characteristics
          1. 8.2.2.4.1 Ceramic
          2. 8.2.2.4.2 Tantalum
          3. 8.2.2.4.3 Aluminum
        5. 8.2.2.5  Setting The Output Voltage
        6. 8.2.2.6  Turnon Characteristics for Output Voltages Programmed to 2 V or Less
        7. 8.2.2.7  RFI/EMI Susceptibility
        8. 8.2.2.8  Output Noise
        9. 8.2.2.9  Power Dissipation
        10. 8.2.2.10 Estimating Junction Temperature
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
  11. 11Device and Documentation Support
    1. 11.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Input Voltage Range: 2.5 V to 7 V
  • Ultra Low Dropout Voltage
  • Low Ground Pin Current
  • Load Regulation of 0.06%
  • 10-nA Quiescent Current in Shutdown Mode
  • Specified Output Current of 1.5-A DC
  • Minimum Output Capacitor Requirements
  • Overtemperature/Overcurrent Protection
  • −40°C to +125°C Junction Temperature Range
  • Available in DDPAK/TO-263 and SOT-223 Packages

2 Applications

  • Microprocessor Power Supplies
  • GTL, GTL+, BTL, and SSTL Bus Terminators
  • Power Supplies for DSPs
  • SCSI Terminator
  • Post Regulators
  • High Efficiency Linear Regulators
  • Battery Chargers
  • Other Battery-Powered Applications

3 Description

The LP3875-ADJ fast ultra-low-dropout LDO operates from a 2.5-V to 7-V input supply. This ultra-low-dropout LDO responds very quickly to step changes in load, which makes it suitable for low-voltage microprocessor applications. The LP3875-ADJ is developed on a CMOS process, which allows low quiescent-current operation independent of output load current. This CMOS process also allows the LP3875-ADJ to operate under extremely low dropout conditions.

  • Dropout Voltage: Ultra-low-dropout voltage; typically 38 mV at 150-mA load current and 380 mV at 1.5-A load current.
  • Ground Pin Current: Typically 6 mA at 1.5-A load current.
  • Shutdown Mode: Typically 10-nA quiescent current when the SD pin is pulled low.
  • Adjustable Output Voltage: The output voltage may be programmed via two external resistors.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LP3875-ADJ SOT-223 (5) 6.50 mm × 3.56 mm
TO-263 (5) 10.16 mm × 8.42 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

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Simplified Schematic

LP3875-ADJ simp_schem_nvs247.gif