SLVS029H January   1984  – November  2015 TL499A

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
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
  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 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • P|8
  • PS|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7 Detailed Description

7.1 Overview

The TL499A provides an adjustable output voltage between 2.9 V and 30 V. The primary power source uses the internal linear regulator to provide the output voltage. When the primary power source is removed, the secondary power source is stepped up using the internal switching regulator to provide the output voltage.

7.2 Functional Block Diagram

TL499A fbd_slvs029.gif

7.3 Feature Description

The TL499A has an adjustable output voltage set by feedback provided to REF pin abs an adjustable switching current is set by value of resistor on SW CURRENT CONTROL pin. The lower resistance provides increased switching current.

Dual power supply inputs also provide protection against power faults on the main supply of the TL499A.

7.4 Device Functional Modes

The TL499A has two functional modes:

  • Linear voltage regulation when SERIES IN1 supply is present.
  • Step-up voltage regulation when SERIES IN1 supply is absent.