SLVS839H July   2008  – October 2023 TPS54331

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  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 Switching Characteristics
    7. 6.7 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  Fixed-Frequency PWM Control
      2. 7.3.2  Voltage Reference (VREF)
      3. 7.3.3  Bootstrap Voltage (BOOT)
      4. 7.3.4  Enable and Adjustable Input Undervoltage Lockout (VIN UVLO)
      5. 7.3.5  Programmable Slow Start Using SS Pin
      6. 7.3.6  Error Amplifier
      7. 7.3.7  Slope Compensation
      8. 7.3.8  Current-Mode Compensation Design
      9. 7.3.9  Overcurrent Protection and Frequency Shift
      10. 7.3.10 Overvoltage Transient Protection
      11. 7.3.11 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Eco-mode
      2. 7.4.2 Operation With VIN < 3.5 V
      3. 7.4.3 Operation With EN Control
  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  Switching Frequency
        3. 8.2.2.3  Output Voltage Set-Point
        4. 8.2.2.4  Input Capacitors
        5. 8.2.2.5  Output Filter Components
          1. 8.2.2.5.1 Inductor Selection
        6. 8.2.2.6  Capacitor Selection
        7. 8.2.2.7  Compensation Components
        8. 8.2.2.8  Bootstrap Capacitor
        9. 8.2.2.9  Catch Diode
        10. 8.2.2.10 Output Voltage Limitations
        11. 8.2.2.11 Power Dissipation Estimate
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
      3. 8.4.3 Electromagnetic Interference (EMI) Considerations
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 Custom Design with WEBENCH® Tools
    2. 9.2 Support Resources
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Mechanical, Packaging, and Orderable Information

6.5 Electrical Characteristics

TJ = –40°C to 150°C, VIN = 3.5 to 28 V (unless otherwise noted)
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
SUPPLY VOLTAGE (VIN PIN)
Internal undervoltage lockout thresholdRising and falling3.5V
Shutdown supply currentEN = 0 V, VIN = 12 V, –40°C to 85°C14μA
Operating – non-switching supply currentVSENSE = 0.85 V110190μA
ENABLE AND UVLO (EN PIN)
Enable thresholdRising and falling1.251.35V
Input currentEnable threshold – 50 mV–1μA
Input currentEnable threshold + 50 mV–4μA
VOLTAGE REFERENCE
Voltage reference0.7720.80.828V
HIGH-SIDE MOSFET
On resistanceBOOT-PH = 3 V, VIN = 3.5 V115200mΩ
BOOT-PH = 6 V, VIN = 12 V80150
ERROR AMPLIFIER
Error amplifier transconductance (gm)–2 μA < I(COMP) < 2 μA, V(COMP) = 1 V92μmhos
Error amplifier DC gain(1)VSENSE = 0.8 V800V/V
Error amplifier unity gain bandwidth(1)5-pF capacitance from COMP to GND pins2.7MHz
Error amplifier source and sink currentV(COMP) = 1 V, 100-mV overdrive±7μA
Switch current to COMP transconductanceVIN = 12 V12A/V
PULSE SKIPPING ECO-MODE
Pulse skipping Eco-mode switch current threshold160mA
CURRENT LIMIT
Current-limit thresholdVIN = 12 V3.55.8A
THERMAL SHUTDOWN
Thermal shutdown165°C
SLOW START (SS PIN)
Charge currentV(SS) = 0.4 V2μA
SS to VSENSE matchingV(SS) = 0.4 V10mV
(1) Specified by design