SNVS539H November   2007  – September 2015 LP38500-ADJ , LP38502-ADJ

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configurations 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 Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Stability And Phase Margin
      2. 7.3.2 Load Transient Response
      3. 7.3.3 Dropout Voltage
      4. 7.3.4 Reverse Current Path
    4. 7.4 Device Functional Modes
      1. 7.4.1 Short-Circuit Protection
      2. 7.4.2 Enable Operation (LP38502-ADJ Only)
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      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 Input Capacitor
        3. 8.2.2.3 Output Capacitor
        4. 8.2.2.4 Setting The Output Voltage
        5. 8.2.2.5 RFI/EMI Susceptibility
        6. 8.2.2.6 Output Noise
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Power Dissipation/Heatsinking
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Printed Circuit Board Layout
    2. 10.2 Layout Examples
      1. 10.2.1 Heatsinking WSON Package
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
      2. 11.1.2 Related Links
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 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: 2.7 V to 5.5 V
  • Adjustable Output Voltage: 0.6 V to 5 V
  • FlexCap: Stable with Ceramic, Tantalum, or Aluminum Capacitors
  • Stable with 10-µF Input and Output Capacitors
  • Low Ground-Pin Current
  • 25-nA Quiescent Current in Shutdown Mode
  • Ensured Output Current of 1.5 A
  • Ensured VADJ Accuracy of ±1.5% at 25°C (A Grade)
  • Ensured Accuracy of ±3.5% at 25°C (STD)
  • Overtemperature and Overcurrent Protection
  • ENABLE Pin (LP38502)

2 Applications

  • ASIC Power Supplies In:
    •  Printers, Graphics Cards, DVD Players
    •  Set Top Boxes, Copiers, Routers
  • DSP and FPGA Power Supplies
  • SMPS Regulator
  • Conversion from 3.3-V or 5-V Rail

3 Description

TI's FlexCap low-dropout (LDO) linear regulators feature unique compensation that allow use of any type of output capacitor with no limits on minimum or maximum equivalent series resistance (ESR). The LP38500 and LP38502 series of LDOs operates from a 2.7-V to 5.5-V input supply. These ultra-low-dropout linear regulators respond very quickly to step changes in load, making them suitable for low-voltage microprocessor applications. Developed on a CMOS process (utilizing a PMOS pass transistor) the LP38500-ADJ and LP38502-ADJ have low quiescent currents that changes little with load current.

  • GND Pin Current: Typically 2 mA at 1.5-A load current.
  • Disable Mode: Typically 25-nA quiescent current when the EN pin is pulled low. (LP38502-ADJ)
  • Simplified Compensation: Stable with any type of output capacitor, regardless of ESR.
  • Precision Output: A grade versions available with 1.5% VADJ tolerance (25°C) and 3% over line, load, and temperature.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LP38500
LP38502		 DDPAK/TO-263 (5) 10.16 mm x 8.42 mm
TO-263 (5) 10.16 mm x 9.85 mm
WSON (8) 3.00 mm x 2.50 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Typical Circuit (LP38500)

LP38500-ADJ LP38502-ADJ 30036119b.png

Typical Circuit (LP38502)

LP38500-ADJ LP38502-ADJ 30036119a.png