SLVS582J April   2006  – August 2024 LP2950 , LP2951

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics (Both Legacy and New Chip)
    6. 5.6 Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagrams
    3. 6.3 Feature Description
      1. 6.3.1 Output Enable
      2. 6.3.2 Dropout Voltage
      3. 6.3.3 Current Limit
      4. 6.3.4 Undervoltage Lockout (UVLO)
      5. 6.3.5 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Shutdown Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Reverse Current
      2. 7.1.2 Input and Output Capacitor Requirements
      3. 7.1.3 Estimating Junction Temperature
      4. 7.1.4 Power Dissipation (PD)
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
        1. 7.2.1.1 Recommended Capacitor Types
          1. 7.2.1.1.1 Recommended Capacitors for the Legacy Chip
          2. 7.2.1.1.2 Recommended Capacitors for the New Chip
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Feedback Resistor Selection
        2. 7.2.2.2 Feedforward Capacitor
      3. 7.2.3 Application Curve
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Device Nomenclature
    4. 8.4 Documentation Support
      1. 8.4.1 Related Documentation
    5. 8.5 Support Resources
    6. 8.6 Trademarks
    7. 8.7 Electrostatic Discharge Caution
    8. 8.8 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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3 Description

The LP2951 is a wide input low-dropout regulator (LDO) supporting an input voltage range from 2V to 30V and up to 100mA of load current. LP2951 is able to output either a fixed or adjustable output from the same device. By tying the OUTPUT and SENSE pins together, and the FEEDBACK and VTAP pins together, the LP2950/LP2951 can give 5V or 3.3V fixed output voltages. Alternatively, by leaving the SENSE and VTAP pins open and connecting FEEDBACK to an external resistor divider, the output can be set to any value between 1.2V to 29V.

The LP2951 has a ERROR output that monitors the voltage at the feedback pin to indicate the status of the output voltage. The SHUTDOWN input and ERROR output can be used for sequencing multiple power supplies in the system.

The LP2951 is available in a 3-pin 4.83mm x 4.83mm TO-92(LP), an 8-pin 4.9mm x 6.0mm SOIC(D), and 8-pin 3mm x 3mm SON(DRG) package.

Package Information
PART NUMBER PACKAGE(1) PACKAGE SIZE(2)
LP2950 LP (TO-92, 3) 4.83mm × 4.83mm
LP2951 D (SOIC, 8) 4.90mm x 6.00mm
DRG (SON, 8) 3.00mm x 3.00mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
LP2950 LP2951 Dropout Voltage vs Temperature (New Chip)
VIN = 4.9V
Figure 3-1 Dropout Voltage vs Temperature (New Chip)
LP2950 LP2951 Typical Application CircuitTypical Application Circuit
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