SLVSDU5A April   2018  – November 2019 TPS57112C-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
      2.      Efficiency vs Output Current
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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. 6.7 Switching Characteristics
    8. 6.8 Typical Characteristics Curves
  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 and Output Current
      3. 7.3.3 Bootstrap Voltage (BOOT) and Low-Dropout Operation
        1. 7.3.3.1 Error Amplifier
      4. 7.3.4 Voltage Reference
    4. 7.4 Device Functional Modes
      1. 7.4.1  Adjusting the Output Voltage
      2. 7.4.2  Enable Functionality and Adjusting Undervoltage Lockout
      3. 7.4.3  Slow-Start or Tracking Pin
      4. 7.4.4  Sequencing
      5. 7.4.5  Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
      6. 7.4.6  Overcurrent Protection
      7. 7.4.7  Frequency Shift
      8. 7.4.8  Reverse Overcurrent Protection
      9. 7.4.9  Synchronize Using the RT/CLK Pin
      10. 7.4.10 Power Good (PWRGD Pin)
      11. 7.4.11 Overvoltage Transient Protection
      12. 7.4.12 Thermal Shutdown
      13. 7.4.13 Small-Signal Model for Loop Response
      14. 7.4.14 Simple Small-Signal Model for Peak-Current-Mode Control
      15. 7.4.15 Small-Signal Model for Frequency Compensation
  8. 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 Selecting the Switching Frequency
        2. 8.2.2.2 Output Inductor Selection
        3. 8.2.2.3 Output Capacitor
        4. 8.2.2.4 Input Capacitor
        5. 8.2.2.5 Slow-Start Capacitor
        6. 8.2.2.6 Bootstrap Capacitor Selection
        7. 8.2.2.7 Output Voltage and Feedback Resistor Selection
        8. 8.2.2.8 Compensation
        9. 8.2.2.9 Power-Dissipation Estimate
      3. 8.2.3 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
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

6.8 Typical Characteristics Curves

TPS57112C-Q1 radson_tj_slvsah5c.gif
Figure 1. High-Side and Low-Side rDS(on) versus Temperature
TPS57112C-Q1 hi_cur_tj_SLVSAL8.gif
Figure 3. High-Side Current-Limit versus Temperature
TPS57112C-Q1 fs_RT_slvsah5c.gif
Figure 5. Switching Frequency versus Rt Resistance, Low-Frequency Range
TPS57112C-Q1 AE_tj_slvsah5c.gif
V(VIN) = 3.3 V
Figure 7. Transconductance versus Temperature
TPS57112C-Q1 thresh_tj_SLVSAH5.gif
Figure 9. EN Pin Voltage versus Temperature
TPS57112C-Q1 EN2_pin_tj_slvsah5c.gif
V(VIN) = 5 V V(EN) = Threshold – 50 mV
Figure 11. EN Pin Current versus Temperature
TPS57112C-Q1 vi_tj_slvsah5c.gif
Figure 13. Input Voltage versus Temperature
TPS57112C-Q1 shutdwn_vi_slvsah5c.gif
TJ = 25ºC
Figure 15. Shutdown Supply Current versus Input Voltage
TPS57112C-Q1 Ivin_vi_slvsah5c.gif
TJ = 25ºC
Figure 17. VIN Supply Current versus Input Voltage
TPS57112C-Q1 RDSON_tj_slvsah5c.gif
V(VIN) = 5 V
Figure 19. PWRGD On-Resistance versus Temperature
TPS57112C-Q1 fs_tj_slvsah5c.gif
Rt = 400 kΩ V(VIN) = 5 V
Figure 2. Frequency versus Temperature
TPS57112C-Q1 vref_tj_slvsah5c.gif
V(VIN) = 3.3 V
Figure 4. Voltage Reference versus Temperature
TPS57112C-Q1 fs_vsense_slvsah5c.gif
Figure 6. Switching Frequency versus VSENSE
TPS57112C-Q1 SS_tj_slvsah5c.gif
V(VIN) = 3.3 V
Figure 8. Transconductance (Slow Start) versus Junction Temperature
TPS57112C-Q1 EN_pin_tj_slvsah5c.gif
V(VIN) = 5 V V(EN) = Threshold + 50 mV
Figure 10. EN Pin Current versus Temperature
TPS57112C-Q1 Iss_tj_slvsah5c.gif
V(VIN) = 5 V
Figure 12. Charge Current versus Temperature
TPS57112C-Q1 shutdwn_tj_slvsah5c.gif
V(VIN) = 3.3 V
Figure 14. Shutdown Supply Current versus Temperature
TPS57112C-Q1 Ivin_tj_slvsah5c.gif
V(VIN) = 3.3 V
Figure 16. VIN Supply Current versus Junction Temperature
TPS57112C-Q1 PWRGD_tj_slvsah5c.gif
V(VIN) = 5 V
Figure 18. PWRGD Threshold versus Temperature
TPS57112C-Q1 SSTR_tj_slvsah5c.gif
V(VIN) = 5 V V(SS/TR) = 0.4 V
Figure 20. SS/TR-to-VSENSE Offset versus Temperature