SLVS889C October   2008  – November 2014 TPS54140

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Fixed Frequency PWM Control
      2. 8.3.2  Slope Compensation Output Current
      3. 8.3.3  Bootstrap Voltage (BOOT)
      4. 8.3.4  Low Dropout Operation
      5. 8.3.5  Error Amplifier
      6. 8.3.6  Voltage Reference
      7. 8.3.7  Adjusting the Output Voltage
      8. 8.3.8  Enable and Adjusting Undervoltage Lockout
      9. 8.3.9  Slow Start and Tracking Pin (SS/TR)
      10. 8.3.10 Overload-Recovery Circuit
      11. 8.3.11 Sequencing
      12. 8.3.12 Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
      13. 8.3.13 Overcurrent Protection and Frequency Shift
      14. 8.3.14 Selecting the Switching Frequency
      15. 8.3.15 How to Interface to RT/CLK Pin
      16. 8.3.16 Power Good (PWRGD Pin)
      17. 8.3.17 Overvoltage Transient Protection
      18. 8.3.18 Thermal Shutdown
      19. 8.3.19 Small-Signal Model for Loop Response
      20. 8.3.20 Simple Small-Signal Model for Peak-Current Mode Control
      21. 8.3.21 Small-Signal Model for Frequency Compensation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Pulse Skip Eco-mode
      2. 8.4.2 Operation With VIN < 3.5 V
      3. 8.4.3 Operation With EN Control
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1  Selecting the Switching Frequency
        2. 9.2.2.2  Output Inductor Selection (LO)
        3. 9.2.2.3  Output Capacitor
        4. 9.2.2.4  Catch Diode
        5. 9.2.2.5  Input Capacitor
        6. 9.2.2.6  Slow-Start Capacitor
        7. 9.2.2.7  Bootstrap Capacitor Selection
        8. 9.2.2.8  Undervoltage-Lockout Set Point
        9. 9.2.2.9  Output Voltage and Feedback Resistors Selection
        10. 9.2.2.10 Compensation
        11. 9.2.2.11 Power Dissipation Estimate
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
      2. 12.1.2 Development Support
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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7 Specifications

7.1 Absolute Maximum Ratings(1)

Over operating temperature range (unless otherwise noted).
MIN MAX UNIT
Input voltage VIN –0.3 47 V
EN –0.3 5
BOOT 55
VSENSE –0.3 3
COMP –0.3 3
PWRGD –0.3 6
SS/TR –0.3 3
RT/CLK –0.3 3.6
Output voltage PH–BOOT 8 V
PH –0.6 47
PH, 10-ns Transient –2 47
Voltage Difference PAD to GND ±200 mV
Source current EN 100 μA
BOOT 100 mA
VSENSE 10 μA
PH Current Limit A
RT/CLK 100 μA
Sink current VIN Current Limit A
COMP 100 μA
PWRGD 10 mA
SS/TR 200 μA
Operating junction temperature –40 150 °C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

7.2 Handling Ratings

MIN MAX UNIT
Tstg Storage temperature range –65 150 °C
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) –1 1 kV
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) –500 500 V
(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.

7.3 Recommended Operating Conditions

Over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
Operating input voltage on the VIN pin 3.5 42 V
Output voltage 0.8 39 V
Output current 0 1.5 A
TJ Operating junction temperature –40 150 °C

7.4 Thermal Information

THERMAL METRIC(1) DGQ UNIT
10 PINS
RθJA Junction-to-ambient thermal resistance 67.4 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 46.7
RθJB Junction-to-board thermal resistance 38.4
ψJT Junction-to-top characterization parameter 1.9
ψJB Junction-to-board characterization parameter 38.4
RθJC(bot) Junction-to-case (bottom) thermal resistance 46.7
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

7.5 Electrical Characteristics

TJ = –40°C to 150°C, VIN = 3.5 to 42V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE (VIN PIN)
Operating input voltage 3.5 42 V
Internal undervoltage lockout threshold No voltage hysteresis, rising and falling 2.5 V
Shutdown supply current EN = 0 V, 25°C, 3.5 V ≤ VIN ≤ 42 V 1.3 4 μA
Operating : nonswitching supply current VSENSE = 0.83 V, VIN = 12 V, 25°C 116 136
ENABLE AND UVLO (EN PIN)
Enable threshold voltage No voltage hysteresis, rising and falling, 25°C 0.9 1.25 1.55 V
Input current Enable threshold 50 mV –3.8 μA
Enable threshold ±50 mV –0.9
Hysteresis current –2.9 μA
VOLTAGE REFERENCE
Voltage reference TJ = 25°C 0.792 0.8 0.808 V
0.784 0.8 0.816
HIGH-SIDE MOSFET
On-resistance VIN = 3.5 V, BOOT-PH = 3 V 300 mΩ
VIN = 12 V, BOOT-PH = 6 V 200 410
ERROR AMPLIFIER
Input current 50 nA
Error amplifier transconductance (gM) –2 μA < ICOMP < 2 μA, VCOMP = 1 V 97 μMhos
Error amplifier transconductance (gM) during slow start –2 μA < ICOMP < 2 μA, VCOMP = 1 V,
VVSENSE = 0.4 V		 26 μMhos
Error amplifier dc gain VVSENSE = 0.8 V 10 000 V/V
Error amplifier bandwidth 2700 kHz
Error amplifier source/sink V(COMP) = 1 V, 100 mV overdrive ±7 μA
COMP to switch current transconductance 6 A/V
CURRENT LIMIT
Current limit threshold VIN = 12 V, TJ = 25°C 1.8 2.7 A
THERMAL SHUTDOWN
Thermal shutdown 182 °C
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Switching Frequency Range using RT mode 100 2500 kHz
fSW Switching frequency RT = 200 kΩ 450 581 720 kHz
Switching Frequency Range using CLK mode 300 2200 kHz
Minimum CLK pulse width 40 ns
RT/CLK high threshold 1.9 2.2 V
RT/CLK low threshold 0.5 0.7 V
RT/CLK falling edge to PH rising edge delay Measured at 500 kHz with RT resistor in series 60 ns
PLL lock in time Measured at 500 kHz 100 μs
SLOW START AND TRACKING (SS/TR)
Charge current VSS/TR = 0.4 V 2 μA
SS/TR-to-VSENSE matching VSS/TR = 0.4 V 45 mV
SS/TR-to-reference crossover 98% nominal 1.0 V
SS/TR discharge current (overload) VSENSE = 0 V, V(SS/TR) = 0.4 V 112 μA
SS/TR discharge voltage VSENSE = 0 V 54 mV
POWER GOOD (PWRGD PIN)
VVSENSE VSENSE threshold VSENSE falling 92%
VSENSE rising 94%
VSENSE rising 109%
VSENSE falling 107%
Hysteresis VSENSE falling 2%
Output high leakage VSENSE = VREF, V(PWRGD) = 5.5 V, 25°C 10 nA
On resistance I(PWRGD) = 3 mA, VSENSE < 0.79 V 50 Ω
Minimum VIN for defined output V(PWRGD) < 0.5 V, II(PWRGD) = 100 μA 0.95 1.5 V

7.6 Typical Characteristics

rdson_tj_lvs795.gif
Figure 1. On Resistance vs Junction Temperature
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Figure 2. Voltage Reference vs Junction Temperature
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Figure 3. Switch Current Limit vs Junction Temperature
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Figure 5. Switching Frequency vs RT/CLK Resistance, High Frequency Range
ea_tj_lvs795.gif
Figure 7. EA Transconductance During Slow Start vs Junction Temperature
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Figure 9. EN Pin Voltage vs Junction Temperature
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Figure 11. EN Pin Current vs Junction Temperature
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Figure 13. SS/TR Discharge Current vs Junction Temperature
icc_tj_lvs795.gif
Figure 15. Shutdown Supply Current vs Junction Temperature
icc2_tj_lvs795.gif
Figure 17. VIN Supply Current vs Junction Temperature
rdson2_tj_lvs795.gif
Figure 19. PWRGD On Resistance vs Junction Temperature
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Figure 21. BOOT-PH UVLO vs Junction temperature
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Figure 23. SS/TR to VSENSE Offset vs VSENSE
fs_tj_lvs795.gif
Figure 4. Switching Frequency vs Junction Temperature
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Figure 6. Switching Frequency vs RT/CLK Resistance, Low Frequency Range
ea2_tj_lvs795.gif
Figure 8. EA Transconductance vs Junction Temperature
ic_tj_lvs795.gif
Figure 10. EN Pin Current vs Junction Temperature
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Figure 12. SS/TR Charge Current vs Junction Temperature
fs_vsense_lvs795.gif
Figure 14. Switching Frequency vs VSENSE
icc_vi_lvs795.gif
Figure 16. Shutdown Supply Current vs Input Voltage (VIN)
icc_vi2_lvs795.gif
Figure 18. VIN Supply Current vs Input Voltage
pwrgd_tj_lvs795.gif
Figure 20. PWRGD Threshold vs Junction Temperature
uvlo_tj_lvs795.gif
Figure 22. Input Voltage (UVLO) vs Junction Temperature
offset_tj_lvs795.gif
Figure 24. SS/TR to VSENSE Offset vs Temperature