SLUS859C October   2008  – January 2015 TPS54233

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  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 Switching Characteristics
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Feature Description
      1. 8.2.1  Fixed Frequency PWM Control
      2. 8.2.2  Voltage Reference (Vref)
      3. 8.2.3  Bootstrap Voltage (BOOT)
      4. 8.2.4  Enable and Adjustable Input Under-Voltage Lockout (VIN UVLO)
      5. 8.2.5  Programmable Slow Start Using SS PIN
      6. 8.2.6  Error Amplifier
      7. 8.2.7  Slope Compensation
      8. 8.2.8  Current Mode Compensation Design
      9. 8.2.9  Overcurrent Protection and Frequency Shift
      10. 8.2.10 Overvoltage Transient Protection
      11. 8.2.11 Thermal Shutdown
    3. 8.3 Device Functional Modes
      1. 8.3.1 Eco-modeTM
  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 Switching Frequency
        2. 9.2.2.2 Output Voltage Set Point
        3. 9.2.2.3 Input Capacitors
        4. 9.2.2.4 Output Filter Components
          1. 9.2.2.4.1 Inductor Selection
          2. 9.2.2.4.2 Capacitor Selection
        5. 9.2.2.5 Compensation Components
        6. 9.2.2.6 Bootstrap Capacitor
        7. 9.2.2.7 Catch Diode
        8. 9.2.2.8 Output Voltage Limitations
        9. 9.2.2.9 Power Dissipation Estimate
      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 Estimated Circuit Area
    4. 11.4 Electromagnetic Interference (EMI) Considerations
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

6 Pin Configuration and Functions

D Package
Top View
po2_lvs839.gif

Pin Functions

PIN DESCRIPTION
NAME NO.
BOOT 1 A 0.1 μF bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor falls below the minimum requirement, the high-side MOSFET is forced to switch off until the capacitor is refreshed.
VIN 2 Input supply voltage, 3.5 V to 28 V.
EN 3 Enable pin. Pull below 1.25V to disable. Float to enable. Programming the input undervoltage lockout with two resistors is recommended.
SS 4 Slow start pin. An external capacitor connected to this pin sets the output rise time.
VSENSE 5 Inverting node of the gm error amplifier.
COMP 6 Error amplifier output, and input to the PWM comparator. Connect frequency compensation components to this pin.
GND 7 Ground.
PH 8 The source of the internal high-side power MOSFET.
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