SLVSAX7E August   2011  – August 2016

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Adjustable Switching Frequency
      2. 8.3.2  Out-of-Phase Operation
      3. 8.3.3  Delayed Start-Up
      4. 8.3.4  Soft-Start Time
      5. 8.3.5  Adjusting the Output Voltage
      6. 8.3.6  Error Amplifier
      7. 8.3.7  Slope Compensation
      8. 8.3.8  Overcurrent Protection
      9. 8.3.9  Thermal Shutdown
      10. 8.3.10 Low Power Mode Operation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation With Minimum VIN (VIN < 4.45 V)
      2. 8.4.2 Operation With EN Control
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Output Inductor Selection
        2. 9.2.2.2 Output Capacitor Selection
        3. 9.2.2.3 Input Capacitor Selection
        4. 9.2.2.4 Bootstrap Capacitor Selection
        5. 9.2.2.5 Loop Compensation
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Power Dissipation
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

1 Features

  • Wide Input Supply Voltage Range: 4.5 V to 18 V
  • 0.8 V, ±1% Accuracy Reference
  • Up to 2-A (Buck 1) and 3-A (Buck 2) Maximum Continuous Output Loading Current
  • Low-Power Pulse Skipping Mode to Achieve High Light Load Efficiency
  • Adjustable Switching Frequency
    300 kHz to 1.4 MHz Set by External Resistor
  • Startup With a Prebiased Output Voltage
  • Dedicated Enable and Soft Start for Each Buck
  • Peak Current-Mode Control With Simple Compensation Circuit
  • Cycle-by-Cycle Overcurrent Protection
  • 180° Out-of-Phase Operation to Reduce Input Capacitance and Power Supply Induced Noise
  • Available in 24-Lead Thermally Enhanced HTSSOP (PWP) and VQFN 4-mm × 4-mm (RGE) Packages

2 Applications

  • DTV
  • DSL Modems
  • Cable Modems
  • Set-Top Boxes
  • Car DVD Players
  • Home Gateway and Access Point Networks
  • Wireless Routers

3 Description

The TPS65270 is a monolithic, dual synchronous buck regulator with a wide operating input voltage that can operate in 5-V, 9-V, 12-V, or 15-V bus voltages and battery chemistries. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application.

The TPS65270 features a precision 0.8-V reference and can produce output voltages up to 15 V. Each converter features an enable pin that allows dedicated control of each channel that provides flexibility for power sequencing. Soft-start time in each channel can be adjusted by choosing different external capacitors. TPS65270 is also able to start up with a prebiased output. The converter begins switching when output voltage reaches the prebiased voltage.

Constant frequency peak current-mode control simplifies the compensation and provides fast transient response. Cycle-by-cycle overcurrent protection and hiccup mode operation limits MOSFET power dissipation in short-circuit or overloading fault conditions. Low-side reverse current protection also prevents excessive sinking current from damaging the converter.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS65270 HTSSOP (24) 7.80 mm × 4.40 mm
VQFN (24) 4.00 mm × 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application

TPS65270 typ_app1_lvsax7.gif

Efficiency vs Output Load

TPS65270 p1_effvslr_lvsax7.gif
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