SLVS582I April   2006  – November 2014 LP2950 , LP2951

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 Handling 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 LP2950 Functional Block Diagram
    3. 7.3 LP2951 Functional Block Diagram
    4. 7.4 Feature Description
      1. 7.4.1 ERROR Function (LP2951 Only)
      2. 7.4.2 Programming Output Voltage (LP2951 Only)
    5. 7.5 Device Functional Modes
      1. 7.5.1 Shutdown Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
        1. 8.2.1.1 Input Capacitor (CIN)
        2. 8.2.1.2 Output Capacitor (COUT)
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Capacitance Value
        2. 8.2.2.2 Capacitor Types
        3. 8.2.2.3 CBYPASS: Noise and Stability Improvement
        4. 8.2.2.4 ESR Range
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

1 Features

  • Wide Input Range: Up to 30 V
  • Rated Output Current of 100 mA
  • Low Dropout: 380 mV (Typ) at 100 mA
  • Low Quiescent Current: 75 μA (Typ)
  • Tight Line Regulation: 0.03% (Typ)
  • Tight Load Regulation: 0.04% (Typ)
  • High VO Accuracy
    • 1.4% at 25°C
    • 2% Over Temperature
  • Can Be Used as a Regulator or Reference
  • Stable With Low ESR (>12 mΩ) Capacitors
  • Current- and Thermal-Limiting Features
  • LP2950 Only (3-Pin Package)
    • Fixed-Output Voltages of 5 V, 3.3 V, and 3 V
  • LP2951 Only (8-Pin Package)
    • Fixed- or Adjustable-Output Voltages: 5 V/ADJ, 3.3 V/ADJ, and 3 V/ADJ
    • Low-Voltage Error Signal on Falling Output
    • Shutdown Capability
    • Remote Sense Capability for Optimal Output Regulation and Accuracy

2 Applications

  • Applications with High-Voltage Input
  • Power Supplies

3 Description

The LP2950 and LP2951 devices are bipolar, low-dropout voltage regulators that can accommodate a wide input supply-voltage range of up to 30 V. The easy-to-use, 3-pin LP2950 is available in fixed-output voltages of 5 V, 3.3 V, and 3 V. However, the 8-pin 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 LP2951 outputs a fixed 5 V, 3.3 V, or 3 V (depending on the version). 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 1.235 V to 30 V.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LP2950 TO-92 (3) 4.83 mm x 4.83 mm
LP2951 SOIC (8) 4.90 mm x 3.90 mm
SON (8) 3.00 mm x 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Dropout Voltage vs Temperature

g_vdrop_ta.gif