SLUSCV2A June   2017  – April 2021 TPS54308

PRODUCTION DATA  

  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 Timing Requirements
  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  Force Continuous Conduction Mode (FCCM)
      3. 7.3.3  Error Amplifier
      4. 7.3.4  Slope Compensation and Output Current
      5. 7.3.5  Enable and Adjusting Undervoltage Lockout
      6. 7.3.6  Safe Start-Up into Pre-Biased Outputs
      7. 7.3.7  Voltage Reference
      8. 7.3.8  Adjusting Output Voltage
      9. 7.3.9  Internal Soft Start
      10. 7.3.10 Bootstrap Voltage (BOOT)
      11. 7.3.11 Overcurrent Protection
        1. 7.3.11.1 High-Side MOSFET Overcurrent Protection
        2. 7.3.11.2 Low-Side MOSFET Overcurrent Protection
      12. 7.3.12 Output Overvoltage Protection (OVP)
      13. 7.3.13 Thermal Shutdown
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 TPS54308 8-V to 28-V Input, 5-V Output Converter
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 Custom Design With WEBENCH® Tools
        2. 8.2.3.2 Input Capacitor Selection
        3. 8.2.3.3 Bootstrap Capacitor Selection
        4. 8.2.3.4 Output Voltage Set Point
        5. 8.2.3.5 Undervoltage Lockout Set Point
        6. 8.2.3.6 Output Filter Components
          1. 8.2.3.6.1 Inductor Selection
          2. 8.2.3.6.2 Output Capacitor Selection
          3. 8.2.3.6.3 Feedforward Capacitor
      4. 8.2.4 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
        1. 11.1.2.1 Custom Design With WEBENCH® Tools
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.5 Electrical Characteristics

The electrical ratings specified in this section apply to all specifications in this document, unless otherwise noted. These specifications are interpreted as conditions that do not degrade the device parametric or functional specifications for the life of the product containing it. TJ = –40°C to +125°C, VIN = 4.5 V to 28 V, (unless otherwise noted).
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
INPUT SUPPLY
VINInput voltage range4.528V
IQNon switching quiescent currentEN =5 V, VFB = 1 V300µA
IOFFShut down currentEN = GND2µA
VIN(UVLO)VIN under voltage lockoutRising VIN3.84.14.45V
Falling VIN3.33.63.9V
Hysteresis400480600mV
ENABLE (EN PIN)
V(EN_RISING)Enable thresholdRising1.211.28V
V(EN_FALLING)Falling1.11.19V
I(EN_INPUT)Input currentVEN = 1 V0.7μA
I(EN_HYS)Hysteresis currentVEN = 1.5 V1.55μA
FEEDBACK AND ERROR AMPLIFIER
VFBFeedback VoltageVIN = 12 V0.5810.5960.611V
POWER STAGE
R(HSD)High-side FET on resistanceTA = 25°C, VBST – SW = 6 V85mΩ
R(LSD)Low-side FET on resistanceTA = 25°C, VIN = 1240mΩ
CURRENT LIMIT
I(LIM_HS)High side current limitMaximum inductor peak current455.9A
I(LIM_LS)Low side source current limitMaximum inductor valley current3.145.5A
I(LIM_LSSOC)Low side sink current limit1.752.83.85A
OSCILLATOR
FswCentre switching frequency255350445kHz
OVER TEMPERATURE PROTECTION
Thermal Shutdown(1)Rising temperature165°C
Hysteresis10°C
Hiccup time32768Cycles
(1) Not production tested