SLVSFN6 December   2020 TPS54622-EP

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configurations 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  Continuous Current Mode Operation (CCM)
      3. 7.3.3  VIN and Power VIN Pins (VIN and PVIN)
      4. 7.3.4  Voltage Reference
      5. 7.3.5  Adjusting the Output Voltage
      6. 7.3.6  Safe Start-Up Into Prebiased Outputs
      7. 7.3.7  Error Amplifier
      8. 7.3.8  Slope Compensation
      9. 7.3.9  Enable and Adjusting Undervoltage Lockout
      10. 7.3.10 Adjustable Switching Frequency and Synchronization (RT/CLK)
      11. 7.3.11 Slow Start (SS/TR)
      12. 7.3.12 Power Good (PWRGD)
      13. 7.3.13 Output Overvoltage Protection (OVP)
      14. 7.3.14 Overcurrent Protection
        1. 7.3.14.1 High-Side MOSFET Overcurrent Protection
        2. 7.3.14.2 Low-Side MOSFET Overcurrent Protection
      15. 7.3.15 Thermal Shutdown
      16. 7.3.16 Small Signal Model for Loop Response
      17. 7.3.17 Simple Small Signal Model for Peak Current Mode Control
      18. 7.3.18 Small Signal Model for Frequency Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Adjustable Switching Frequency (RT Mode)
      2. 7.4.2 Synchronization (CLK Mode)
      3. 7.4.3 Bootstrap Voltage (BOOT) and Low Dropout Operation
      4. 7.4.4 Sequencing (SS/TR)
  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 Procedures
        1. 8.2.2.1  Custom Design With WEBENCH® Tools
        2. 8.2.2.2  Operating Frequency
        3. 8.2.2.3  Output Inductor Selection
        4. 8.2.2.4  Output Capacitor Selection
        5. 8.2.2.5  Input Capacitor Selection
        6. 8.2.2.6  Slow-Start Capacitor Selection
        7. 8.2.2.7  Bootstrap Capacitor Selection
        8. 8.2.2.8  Undervoltage Lockout Setpoint
        9. 8.2.2.9  Output Voltage Feedback Resistor Selection
          1. 8.2.2.9.1 Minimum Output Voltage
        10. 8.2.2.10 Compensation Component Selection
        11. 8.2.2.11 Fast Transient Considerations
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Estimated Circuit Area
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
      2. 11.1.2 Custom Design With WEBENCH® Tools
    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

6.5 Electrical Characteristics

TJ = –55°C to 150°C, VIN = 4.5 V to 17 V, PVIN = 1.6 V to 17 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE (VIN AND PVIN PINS)
VIN internal UVLO threshold VIN rising 4 4.5 V
VIN internal UVLO hysteresis 150 mV
VIN shutdown supply Current EN = 0 V 2 5 μA
VIN operating – non switching supply current VSENSE = 810 mV 600 800 μA
ENABLE AND UVLO (EN PIN)
Enable threshold Rising 1.22 1.26 V
Enable threshold Falling 1.1 1.18
Input current EN = 1.1 V 1.08 μA
Hysteresis current EN = 1.3 V 3.2 μA
VOLTAGE REFERENCE
Voltage reference 0 A ≤ IOUT ≤ 6 A 0.594 0.6 0.606 V
MOSFET
High-side switch resistance BOOT-PH = 3 V 32 60 mΩ
High-side switch resistance(1) BOOT-PH = 6 V 26 40 mΩ
Low-side Switch Resistance(1) VIN = 12 V 19 30 mΩ
ERROR AMPLIFIER
Error amplifier Transconductance (gm) –2 μA < ICOMP < 2 μA, V(COMP) = 1 V 1300 μMhos
Error amplifier dc gain VSENSE = 0.6 V 1000 3100 V/V
Error amplifier source/sink V(COMP) = 1 V, 100-mV input overdrive ±125 μA
Start switching threshold 0.25 V
COMP to Iswitch gm 16 A/V
CURRENT LIMIT
High-side switch current limit threshold 8 11 14 A
Low-side switch sourcing current limit 6.5 10 15 A
Low-side switch sinking current limit 2 3 4 A
Hiccup wait time 512 Cycles
Hiccup time before re-start 16384 Cycles
THERMAL SHUTDOWN
Thermal shutdown (2) 160 175 °C
Thermal shutdown hysteresis (2) 10 °C
Thermal shutdown hiccup time (2) 16384 Cycles
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Minimum switching frequency Rrt = 240 kΩ (1%) 160 200 240 kHz
Switching frequency Rrt = 100 kΩ (1%) 400 480 560 kHz
Maximum switching frequency Rrt = 29 kΩ (1%) 1500 1600 1900 kHz
Minimum pulse width 20 ns
RT/CLK high threshold 2 V
RT/CLK low threshold 0.7 V
RT/CLK falling edge to PH rising edge delay Measure at 500 kHz with RT resistor in series 66 ns
Switching frequency range (RT mode set point and CLK mode) 200 1600 kHz
PH (PH PIN)
Minimum on-time Measured at 90% to 90% of VIN, 25°C, IPH = 2A 100 145 ns
BOOT (BOOT PIN)
BOOT-PH UVLO 2.3 3 V
SLOW START AND TRACKING (SS/TR PIN)
SS charge current 2.14 μA
SS/TR to VSENSE matching V(SS/TR) = 0.4 V 16 60 mV
POWER GOOD (PWRGD PIN)
VSENSE threshold VSENSE falling (Fault) 92 % Vref
VSENSE rising (Good) 94 % Vref
VSENSE rising (Fault) 111 % Vref
VSENSE falling (Good) 109 % Vref
Output high leakage VSENSE = Vref, V(PWRGD) = 5.5 V 30 100 nA
Output low sink current V(PWRGD) = 0.3V 2 mA
Minimum VIN for valid output V(PWRGD) < 0.5 V at 100 μA 0.6 1 V
Minimum SS/TR voltage for PWRGD 1.4 V
(1) Measured at pins.
(2) Specified by design. Not production tested.