SLVSDA6 October 2016 TPS65266-1


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Timing Requirements
    7. 6.7Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1 Adjusting the Output Voltage
      2. 7.3.2 Enable and Adjusting UVLO
      3. 7.3.3 Soft-Start Time
      4. 7.3.4 Power-Up Sequencing
      5. 7.3.5 Bootstrap Voltage and BST-LX UVLO
      6. 7.3.6 Out of Phase Operation
      7. 7.3.7 Output Overvoltage Protection (OVP)
      8. 7.3.8 Slope Compensation
      9. 7.3.9 Overcurrent Protection
        1. MOSFET Overcurrent Protection
        2. MOSFET Overcurrent Protection
      10. 7.3.10Power Good
      11. 7.3.11Adjustable Switching Frequency
      12. 7.3.12PSM
      13. 7.3.13Thermal Shutdown
    4. 7.4Device Functional Modes
      1. 7.4.1Operation With VIN < 2.6 V (Minimum VIN)
      2. 7.4.2Operation With EN Control
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
        1. Inductor Selection
        2. Capacitor Selection
        3. Capacitor Selection
        4. Compensation
      3. 8.2.3Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Device Support
      1. 11.1.1Related Parts
    2. 11.2Receiving Notification of Documentation Updates
    3. 11.3Community Resources
    4. 11.4Trademarks
    5. 11.5Electrostatic Discharge Caution
    6. 11.6Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Orderable Information

1 Features

  • Operating Input Voltage Range 2.7 to 6 V
  • Feedback Reference Voltage 0.6 V ±1%
  • Maximum Continuous Output Current 3 A/2 A/2 A
  • Dedicated Enable and Soft Start
  • Accurate Start-Up Timing Control With Enable Pins Discharge
  • Pulse Skipping Mode (PSM) at Light Load
  • Cycle-by-Cycle Current Limiting With Hiccup Mode Overcurrent Protection
  • Adjustable Clock Frequency 250 kHz to 2.4 MHz
  • External Clock Synchronization
  • Power-Good Indicator
  • Overtemperature Protection

2 Applications

  • Printer and Scanner
  • Digital TV
  • Set Top Box
  • Home Gateway and Access Point Networks
  • Surveillance

3 Description

The TPS65266-1 incorporates 3 channels of high-efficiency synchronous buck converter for applications operating off the adaptor or battery with input voltage lower than 6 V.

The buck DC/DC converter integrates power MOSFETs for optimized power efficiency and reduces external component counts. The peak current mode control simplifies the compensation and fast transient response. High clock frequency allows smaller and low-value inductors and capacitors. External compensation supports optimized loop compensation and fast transient response. In light load condition, the buck converter operates in PSM mode for a reduction on the input power supplied to the system. Cycle-by-cycle overcurrent limiting with hiccup mode limits MOSFET power dissipation in short circuit or overloading fault conditions.

The TPS65266-1 features a power-good supervisor circuit that monitors all converter outputs. The PGOOD pin is asserted after the output voltages in each channel are in regulation and sequencing is done.

When continuous heavy overload or short circuit increases power dissipation in the buck converter, internal thermal protection circuit shuts off the device to prevent damage. Recovery from a thermal shutdown is automatic after the device has cooled sufficiently.

Device Information(1)

TPS65266-1VQFN (32)5.00 mm × 5.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.


Simplified Application Schematic

TPS65266-1 FAD_typ_app_LVSDA6.gif

Efficiency vs Output Load

TPS65266-1 D001_SLVSDA6.gif