SLVSC56B September   2013  – November 2015 TPS54540-Q1

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. 6.7 Switching Characteristics
    8. 6.8 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  Slope Compensation Output Current
      3. 7.3.3  Pulse-Skip Eco-mode
      4. 7.3.4  Low Dropout Operation and Bootstrap Voltage (BOOT)
      5. 7.3.5  Error Amplifier
      6. 7.3.6  Adjusting the Output Voltage
      7. 7.3.7  Enable and Adjusting Undervoltage Lockout
      8. 7.3.8  Internal Soft Start
      9. 7.3.9  Constant Switching Frequency and Timing Resistor (RT/CLK) Pin)
      10. 7.3.10 Synchronization to RT/CLK Pin
      11. 7.3.11 Maximum Switching Frequency
      12. 7.3.12 Accurate Current Limit
      13. 7.3.13 Overvoltage Protection
      14. 7.3.14 Thermal Shutdown
      15. 7.3.15 Small Signal Model for Loop Response
      16. 7.3.16 Simple Small Signal Model for Peak Current Mode Control
      17. 7.3.17 Small Signal Model for Frequency Compensation
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Buck Converter With 6-V to 42-V Input and 3.3-V at 5-A Output
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1  Selecting the Switching Frequency
          2. 8.2.1.2.2  Output Inductor Selection (LO)
          3. 8.2.1.2.3  Output Capacitor
          4. 8.2.1.2.4  Catch Diode
          5. 8.2.1.2.5  Input Capacitor
          6. 8.2.1.2.6  Bootstrap Capacitor Selection
          7. 8.2.1.2.7  Undervoltage Lockout Set Point
          8. 8.2.1.2.8  Output Voltage and Feedback Resistors Selection
          9. 8.2.1.2.9  Compensation
          10. 8.2.1.2.10 Power Dissipation Estimate
          11. 8.2.1.2.11 Safe Operating Area
          12. 8.2.1.2.12 Discontinuous Conduction Mode and Eco-mode Boundary
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Inverting Buck-Boost Topology for Positive Input to Negative Output
      3. 8.2.3 Split-Rail Power Supply
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Estimated Circuit Area
  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 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
Voltage VIN –0.3 65 V
EN –0.3 8.4
FB –0.3 3
COMP –0.3 3
RT/CLK –0.3 3.6
BOOT-SW –0.3 8
SW –0.6 65
SW, 10-ns Transient –2 65
Operating junction temperature –40 150 °C
Storage temperature, Tstg –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±750
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
VIN Input supply voltage 4.5 60 V
VO Output voltage 0.8 58.8 V
IO Output current 0 5 A
TJ Junction Temperature –40 150 °C

6.4 Thermal Information

THERMAL METRIC(1) TPS54540-Q1 UNIT
DDA (HSOP)
8 PINS
RθJA Junction-to-ambient thermal resistance 41.7 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 52.7 °C/W
RθJB Junction-to-board thermal resistance 22.6 °C/W
ψJT Junction-to-top characterization parameter 7.9 °C/W
ψJB Junction-to-board characterization parameter 22.5 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 2.6 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

TJ = –40°C to 150°C, VIN = 4.5 V to 42 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE (VIN PIN)
Operating input voltage 4.5 42 V
Internal undervoltage lockout threshold Rising 4.1 4.3 4.48 V
Internal undervoltage lockout threshold hysteresis 325 mV
Shutdown supply current EN = 0 V, 25°C, 4.5 V ≤ VIN ≤ 42 V 2.25 4.5 μA
Operating: nonswitching supply current FB = 0.9 V, TA = 25°C 146 175
ENABLE AND UVLO (EN PIN)
Enable threshold voltage No voltage hysteresis, rising and falling 1.1 1.2 1.3 V
Input current Enable threshold 50 mV –4.6 μA
Enable threshold –50 mV –0.58 –1.2 –1.8
Hysteresis current –2.2 –3.4 –4.5 μA
INTERNAL SOFT-START TIME
Soft-start time fSW = 500 kHz, 10% to 90% 2.1 ms
Soft-start time fSW = 2.5 MHz, 10% to 90% 0.42 ms
VOLTAGE REFERENCE
Voltage reference 0.792 0.8 0.808 V
HIGH-SIDE MOSFET
On-resistance VIN = 12 V, BOOT-SW = 6 V 92 190 mΩ
ERROR AMPLIFIER
Input current 50 nA
Error amplifier transconductance (gM) –2 μA < ICOMP < 2 μA, VCOMP = 1 V 350 μS
Error amplifier transconductance (gM) during soft-start –2 μA < ICOMP < 2 μA, VCOMP = 1 V, VFB = 0.4 V 77 μS
Error amplifier DC gain VFB = 0.8 V 10000 V/V
Minimum unity gain bandwidth 2500 kHz
Error amplifier source and sink V(COMP) = 1 V, 100-mV overdrive ±30 μA
COMP to SW current transconductance 17 A/V
CURRENT LIMIT
Current limit threshold All VIN and temperatures, Open Loop(1) 6.3 7.5 8.8 A
All temperatures, VIN = 12 V, Open Loop(1) 6.3 7.5 8.3
VIN = 12 V, TA = 25°C, Open Loop(1) 7.1 7.5 7.9
THERMAL SHUTDOWN
Thermal shutdown 176 °C
Thermal shutdown hysteresis 12 °C
ERROR AMPLIFIER
Enable to COMP active VIN = 12 V, TA = 25°C 540 µs
(1) Open-loop current limit measured directly at the SW pin and is independent of the inductor value and slope compensation.

6.6 Timing Requirements

TJ = –40°C to 150°C, VIN = 4.5 V to 42 V (unless otherwise noted)
MIN NOM MAX UNIT
RT/CLK
Minimum CLK input pulse width 15 ns

6.7 Switching Characteristics

TJ = –40°C to 150°C, VIN = 4.5 V to 42 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
CURRENT LIMIT
Current limit threshold delay 60 ns
RT/CLK
Switching frequency range using RT mode 100 2500 kHz
fSW Switching frequency RT = 200 kΩ 450 500 550 kHz
Switching frequency range using CLK mode 160 2300 kHz
RT/CLK high threshold 1.55 2 V
RT/CLK low threshold 0.5 1.2 V
RT/CLK falling edge to SW rising edge delay Measured at 500 kHz with RT resistor in series 55 ns
PLL lock in time Measured at 500 kHz 78 μs

6.8 Typical Characteristics

TPS54540-Q1 C025_SLVSBN0.png
Figure 1. ON-Resistance vs Junction Temperature
TPS54540-Q1 C027_SLVSBN0.png
Figure 3. Switch Current Limit vs Junction Temperature
TPS54540-Q1 C029_SLVSBN0.png
Figure 5. Switching Frequency vs Junction Temperature
TPS54540-Q1 C031_SLVSBN0.png
Figure 7. Switching Frequency vs RT/CLK Resistance
High-Frequency Range
TPS54540-Q1 C033_SLVSBN0.png
Figure 9. EA Transconductance During Soft-Start vs Junction Temperature
TPS54540-Q1 C035_SLVSBN0.png
Figure 11. EN Pin Current vs Junction Temperature
TPS54540-Q1 C037_SLVSBN0.png
Figure 13. EN Pin Current Hysteresis vs Junction Temperature
TPS54540-Q1 C039_SLVSBN0.png
Figure 15. Shutdown Supply Current vs Junction Temperature
TPS54540-Q1 C041_SLVSBN0.png
Figure 17. VIN Supply Current vs Junction Temperature
TPS54540-Q1 C043_SLVSBN0.png
Figure 19. BOOT-SW UVLO vs Junction Temperature
TPS54540-Q1 C045_SLVSBN0.png
Figure 21. Soft-Start Time vs Switching Frequency
TPS54540-Q1 C026_SLVSBN0.png
Figure 2. Voltage Reference vs Junction Temperature
TPS54540-Q1 C028_SLVSC56.png
Figure 4. Switch Current Limit vs Input Voltage
TPS54540-Q1 C030_SLVSBN0.png
Figure 6. Switching Frequency vs RT/CLK Resistance Low-Frequency Range
TPS54540-Q1 C032_SLVSBN0.png
Figure 8. EA Transconductance vs Junction Temperature
TPS54540-Q1 C034_SLVSBN0.png
Figure 10. EN Pin Voltage vs Junction Temperature
TPS54540-Q1 C036_SLVSBN0.png
Figure 12. EN Pin Current vs Junction Temperature
TPS54540-Q1 C038_SLVSBN0.png
Figure 14. Switching Frequency vs VSENSE
TPS54540-Q1 C040_SLVSC56.png
Figure 16. Shutdown Supply Current vs Input Voltage (VIN)
TPS54540-Q1 C042_SLVSC56.png
Figure 18. VIN Supply Current vs Input Voltage
TPS54540-Q1 C044_SLVSBN0.png
Figure 20. Input Voltage UVLO vs Junction Temperature
TPS54540-Q1 C046_SLVSBN0.png
Figure 22. 5-V Start and Stop Voltage
(See Low Dropout Operation and Bootstrap Voltage (BOOT))