SLVSDD1G December   2017  – June 2024 TPS62800 , TPS62801 , TPS62802 , TPS62806 , TPS62807 , TPS62808

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Smart Enable and Shutdown (EN)
      2. 7.3.2 Soft Start
      3. 7.3.3 VSEL/MODE Pin
        1. 7.3.3.1 Output Voltage Selection (R2D Converter)
        2. 7.3.3.2 Mode Selection — Power Save Mode and Forced PWM Operation
      4. 7.3.4 Undervoltage Lockout (UVLO)
      5. 7.3.5 Switch Current Limit and Short Circuit Protection
      6. 7.3.6 Thermal Shutdown
      7. 7.3.7 Output Voltage Discharge
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power Save Mode Operation
      2. 7.4.2 Forced PWM Mode Operation
      3. 7.4.3 100% Mode Operation
      4. 7.4.4 Optimized Transient Performance from PWM-to-PFM Mode Operation
  9. 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
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Inductor Selection
        3. 8.2.2.3 Output Capacitor Selection
        4. 8.2.2.4 Input Capacitor Selection
      3. 8.2.3 Application Curves
    3. 8.3 System Examples
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Mechanical Data

8.2.2.4 Input Capacitor Selection

Because the buck converter has a pulsating input current, a low-ESR ceramic input capacitor is required for best input voltage filtering to minimize input voltage spikes. For most applications, a 4.7-µF input capacitor is sufficient. When operating from a high impedance source, like a coin cell, a larger input buffer capacitor ≥ 10 μF is recommended to avoid voltage drops during start-up and load transients. The input capacitor can be increased without any limit for better input voltage filtering. The leakage current of the input capacitor adds to the overall current consumption.

Table 8-4 shows a selection of input and output capacitors.

Table 8-4 List of Possible Capacitors
Capacitance [μF] Capacitor Part Number Size Imperial (Metric) Dimensions L × W × T Supplier(1)
4.7 GRM155R60J475ME47D 0402 (1005) 1.0 mm × 0.5 mm × 0.6 mm maximum Murata
4.7 GRM035R60J475ME15 0201 (0603) 0.6 mm × 0.3 mm × 0.55 mm maximum Murata
10 GRM155R60J106ME15D 0402 (1005) 1.0 mm × 0.5 mm × 0.65 mm maximum Murata
(1) See the Third-party Products Disclaimer.