SBVS087M June   2008  – June 2018 TPS735

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Typical Application
  4. 4 Revision History
    1.     Pin Configuration and Functions
      1.      Pin Functions
  5. 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
    6. 5.6 Typical Characteristics
  6. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagrams
    3. 6.3 Feature Description
      1. 6.3.1 Internal Current Limit
      2. 6.3.2 Shutdown
      3. 6.3.3 Dropout Voltage
      4. 6.3.4 Start-Up and Noise Reduction Capacitor
      5. 6.3.5 Transient Response
      6. 6.3.6 Undervoltage Lockout
      7. 6.3.7 Minimum Load
      8. 6.3.8 Thermal Protection
    4. 6.4 Device Functional Modes
      1. 6.4.1 Normal Operation
      2. 6.4.2 Dropout Operation
      3. 6.4.3 Disabled
  7. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Design Requirements
        1. 7.2.1.1 Input and Output Capacitor Requirements
        2. 7.2.1.2 Feed-Forward Capacitor Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Output Noise
      3. 7.2.3 Application Curves
  8. 8 Power Supply Recommendations
  9. 9 Layout
    1. 9.1 Layout Guidelines
      1. 9.1.1 Board Layout Recommendations to Improve PSRR and Noise Performance
    2. 9.2 Layout Example
    3. 9.3 Power Dissipation
    4. 9.4 Estimating Junction Temperature
    5. 9.5 Package Mounting
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
        1. 10.1.1.1 Evaluation Modules
      2. 10.1.2 Device Nomenclature
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.3.4 Start-Up and Noise Reduction Capacitor

Fixed voltage versions of the TPS735 use a quick-start circuit to charge the noise reduction (NR) capacitor (CNR) if present (see Functional Block Diagrams). This architecture allows the combination of low output noise and fast start-up times. The NR pin is high impedance so a low-leakage CNR capacitor must be used. Most ceramic capacitors are appropriate in this configuration. A high-quality, COG-type (NPO) dielectric ceramic capacitor is recommended for CNR when used in environments where abrupt changes in temperature can occur.

For the fastest start-up, first apply VIN , then drive the enable (EN) pin high. If EN is tied to IN, start-up is slower. See Typical Applications. The quick-start switch closes for approximately 135 μs. To ensure that CNR is charged during the quick-start time, use a capacitor with a value of no more than 0.01 μF.