SNVS095F May 2004  – March 2015 LP2952-N , LP2953


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics: 3.3-V Versions
    6. 6.6Electrical Characteristics: 5-V Versions
    7. 6.7Electrical Characteristics: All Voltage Options
    8. 6.8Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagrams
    3. 7.3Feature Description
      1. 7.3.1Fixed Voltage Options and Programmable Voltage Version
      2. 7.3.2High-Accuracy Output Voltage
      3. 7.3.3Error Detection Comparator Output
      4. 7.3.4Auxiliary Comparator
      5. 7.3.5 Short-Circuit Protection (Current Limit)
      6. 7.3.6Thermal Protection
      7. 7.3.7Automatic Output Discharge
    4. 7.4Device Functional Mode
      1. 7.4.1Shutdown Mode
  8. Application and Implementation
    1. 8.1Application Information
      1. 8.1.1External Capacitors
      2. 8.1.2Minimum Load
      3. 8.1.3Programming the Output Voltage
      4. 8.1.4Dropout Voltage
      5. 8.1.5Dropout Detection Comparator
      6. 8.1.6Output Isolation
      7. 8.1.7Reducing Output Noise
      8. 8.1.8Auxiliary Comparator (LP2953 Only)
      9. 8.1.9SHUTDOWN Input
    2. 8.2Typical Applications
      1. 8.2.1Basic 5-V Regulator
        1. Requirements
        2. Design Procedure
        3. Curves
      2. 8.2.25-V Current Limiter with Load Fault Indicator
      3. 8.2.3Low Temperature Coefficient Current Sink
      4. 8.2.45-V Regulator With Error Flags for Low Battery and Out of Regulation
      5. 8.2.55-V Battery Powered Supply With Backup and Low Battery Flag
      6. 8.2.65-V Regulator With Timed Power-On Reset
      7. 8.2.75-V Regulator With Snap-ON and Snap-OFF Features and Hysteresis
      8. 8.2.85-V Regulator With Error Flags for Low Battery and Out of Regulation With Snap-ON or Snap-OFF Output
      9. 8.2.95-V Regulator With Timed Power-On Reset, Snap-ON and Snap-OFF Features, and Hysteresis
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
    3. 10.3Power Dissipation: Heatsink Requirements (Industrial Temperature Range Devices)
  11. 11Device and Documentation Support
    1. 11.1Related Links
    2. 11.2Trademarks
    3. 11.3Electrostatic Discharge Caution
    4. 11.4Glossary
  12. 12Mechanical, Packaging, and Orderable Information


机械数据 (封装 | 引脚)

1 Features

  • 2.3-V to 30-V Input Voltage Range
  • Output Voltage Adjusts from 1.23 V to 29 V
  • 250-mA Output Current
  • Extremely Low Quiescent Current
  • Low Dropout Voltage
  • Extremely Tight Line and Load Regulation
  • Very Low Temperature Coefficient
  • Current and Thermal Limiting
  • Reverse Battery-Input Protection
  • 50-mA (Typical) Automatic Output Discharge
  • LP2953 Versions Only
    • Auxiliary Comparator Included With CMOS- and TTL-Compatible Output Levels. Can Be Used for Fault Detection, Low-Input Line Detection, and so on.

2 Applications

  • High-Efficiency Linear Regulator
  • Regulator With Undervoltage Shutdown
  • Low-Dropout Battery-Powered Regulator
  • Snap-ON/Snap-OFF Regulator

3 Description

The LP2952 and LP2953 are micropower voltage regulators with very low quiescent current (130 μA typical at 1-mA load) and very low dropout voltage (typically 60 mV at light load and 470 mV at 250-mA load current). They are ideally suited for battery-powered systems. Furthermore, the quiescent current increases only slightly at dropout, which prolongs battery life.

The LP2952 and LP2953 retain all the desirable characteristics of the LP2951, but offer increased output current, additional features, and an improved shutdown function.

The automatic output discharge pulls the output down quickly when the shutdown is activated.

The error flag goes low if the output voltage drops out of regulation.

Reverse battery-input protection is provided.

The internal voltage reference is made available for external use, providing a low temperature coefficient (20 ppm/°C) reference with very good line (0.03%) and load (0.04%) regulation.

Device Information(1)

LP2952x SOIC (16)9.90 mm × 3.91 mm
LP2953x SOIC (16)9.90 mm × 3.91 mm
PDIP (16)21.755 mm × 6.35 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Schematic

LP2952-N LP2952A LP2953 LP2953A 01112709.png