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  • TPS54560-Q1 4.5-V to 60-V Input, 5-A, Step-Down DC-DC Converter With Eco-Mode™

    • SLVSBZ0A September   2013  – December 2014 TPS54560-Q1

      PRODUCTION DATA.  

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  • TPS54560-Q1 4.5-V to 60-V Input, 5-A, Step-Down DC-DC Converter With Eco-Mode™
  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
      1. 7.3.1  Fixed Frequency PWM Control
      2. 7.3.2  Slope Compensation Output Current
      3. 7.3.3  Pulse Skip Eco-Mode
      4. 7.3.4  Low Dropout Operation and Bootstrap Voltage (BOOT)
      5. 7.3.5  Error Amplifier
      6. 7.3.6  Adjusting the Output Voltage
      7. 7.3.7  Enable and Adjusting Undervoltage Lockout
      8. 7.3.8  Internal Soft-Start
      9. 7.3.9  Constant Switching Frequency and Timing Resistor (RT/CLK) Pin)
      10. 7.3.10 Accurate Current Limit Operation and Maximum Switching Frequency
      11. 7.3.11 Synchronization to RT/CLK Pin
      12. 7.3.12 Overvoltage Protection
      13. 7.3.13 Thermal Shutdown
      14. 7.3.14 Small Signal Model for Loop Response
      15. 7.3.15 Simple Small Signal Model for Peak Current Mode Control
      16. 7.3.16 Small Signal Model for Frequency Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation With VI = 4.5 V (Minimum VDD)
      2. 7.4.2 Operation With EN Control
      3. 7.4.3 Alternative Power-Supply Topologies
        1. 7.4.3.1 Inverting Power Supply
        2. 7.4.3.2 Split-Rail Power Supply
  8. 8 Applications 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  Selecting the Switching Frequency
        2. 8.2.2.2  Output Inductor Selection (LO)
        3. 8.2.2.3  Output Capacitor
        4. 8.2.2.4  Catch Diode
        5. 8.2.2.5  Input Capacitor
        6. 8.2.2.6  Bootstrap Capacitor Selection
        7. 8.2.2.7  Undervoltage Lockout Set Point
        8. 8.2.2.8  Output Voltage and Feedback Resistors Selection
        9. 8.2.2.9  Compensation
        10. 8.2.2.10 Discontinuous Conduction Mode and Eco-Mode Boundary
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Power Dissipation
    4. 10.4 Safe Operating Area
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
  13. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • DDA|8
    • MPDS092F
Thermal pad, mechanical data (Package|Pins)
  • DDA|8
    • PPTD178C
Orderable Information
  • slvsbz0a_oa
  • slvsbz0a_pm
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DATA SHEET

TPS54560-Q1 4.5-V to 60-V Input, 5-A, Step-Down DC-DC Converter With Eco-Mode™

1 Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H1C
    • Device CDM ESD Classification Level C3B
  • High Efficiency at Light Loads With Pulse-Skipping Eco-Mode™
  • 92-mΩ High-Side MOSFET
  • 146-μA Operating Quiescent Current and 2-µA Shutdown Current
  • 100-kHz to 2.5-MHz Adjustable Switching Frequency
  • Synchronizes to External Clock
  • Low Dropout at Light Loads with Integrated BOOT Recharge FET
  • Adjustable UVLO Voltage and Hysteresis
  • 0.8-V 1% Internal Voltage Reference
  • 8-Pin HSOIC with PowerPAD™ Package
  • –40°C to 150°C TJOperating Range
  • Supported by WEBENCH® Software Tool

2 Applications

  • Vehicle Accessories: GPS (See SLVA412), Entertainment, ADAS, eCall
  • USB Dedicated Charging Ports and Battery Chargers (See SLVA464)
  • Industrial Automation and Motor Control
  • 12-V, 24-V and 48-V Industrial, Automotive and Communications Power Systems

3 Description

The TPS54560-Q1 is a 60-V, 5-A, step-down regulator with an integrated high side MOSFET. The device survives load dump pulses up to 65 V per ISO 7637. Current mode control provides simple external compensation and flexible component selection. A low-ripple, pulse-skip mode reduces the no load supply current to 146 μA. Shutdown supply current is reduced to 2 μA when the enable pin is pulled low.

Undervoltage lockout is internally set at 4.3 V but can be increased using an external resistor divider at the enable pin. The output voltage start-up ramp is internally controlled to provide a controlled start-up and eliminate overshoot.

A wide adjustable frequency range allows either efficiency or external component size to be optimized. Output current is limited cycle-by-cycle. Frequency foldback and thermal shutdown protects internal and external components during an overload condition.

The TPS54560-Q1 is available in an 8-pin thermally enhanced HSOIC PowerPAD package.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS54560-Q1 SO PowerPAD (8) 3.90 mm x 4.89 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

simple_sch_slvsbz0.gif

Efficiency vs Load Current

C024_SLVSBN0.png

4 Revision History

Changes from * Revision (September 2013) to A Revision

  • Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section.Go

5 Pin Configuration and Functions

DDA Package
8-Pin HSOIC
Top View
po_lvsBB4.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
BOOT 1 O A bootstrap capacitor is required between BOOT and SW. If the voltage on this capacitor is below the minimum required to operate the high-side MOSFET, the output is switched off until the capacitor is refreshed.
VIN 2 I Input supply voltage with 4.5 V to 60 V operating range.
EN 3 I Enable pin, with internal pull-up current source. Pull below 1.2 V to disable. Float to enable. Adjust the input undervoltage lockout with two resistors. See the Enable and Adjusting Undervoltage Lockout section.
RT/CLK 4 I Resistor Timing and External Clock. An internal amplifier holds this pin at a fixed voltage when using an external resistor to ground to set the switching frequency. If the pin is pulled above the PLL upper threshold, a mode change occurs and the pin becomes a synchronization input. The internal amplifier is disabled and the pin is a high impedance clock input to the internal PLL. If clocking edges stop, the internal amplifier is re-enabled and the operating mode returns to resistor frequency programming.
FB 5 I Inverting input of the transconductance (gm) error amplifier.
COMP 6 O Error amplifier output and input to the output switch current (PWM) comparator. Connect frequency compensation components to this pin.
GND 7 – Ground
SW 8 I The source of the internal high-side power MOSFET and switching node of the converter.
Thermal Pad 9 – GND pin must be electrically connected to the exposed pad on the printed circuit board for proper operation.

 
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