SLVSFQ6A November   2020  – June 2021 TPS2640

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Undervoltage Lockout (UVLO)
      2. 9.3.2 Overvoltage Protection (OVP)
      3. 9.3.3 Reverse Input Supply Protection
      4. 9.3.4 Hot Plug-In and In-Rush Current Control
      5. 9.3.5 Overload and Short Circuit Protection
        1. 9.3.5.1 Overload Protection
          1. 9.3.5.1.1 Active Current Limiting
          2. 9.3.5.1.2 Electronic Circuit Breaker with Overload Timeout, MODE = OPEN
        2. 9.3.5.2 Short Circuit Protection
          1. 9.3.5.2.1 Start-Up With Short-Circuit On Output
        3. 9.3.5.3 FAULT Response
          1. 9.3.5.3.1 Look Ahead Overload Current Fault Indicator
        4. 9.3.5.4 Current Monitoring
        5. 9.3.5.5 IN, OUT, RTN, and GND Pins
        6. 9.3.5.6 Thermal Shutdown
        7. 9.3.5.7 Low Current Shutdown Control (SHDN)
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Step by Step Design Procedure
        2. 10.2.2.2 Undervoltage Lockout and Overvoltage Set Point
        3. 10.2.2.3 Programming Current Monitoring Resistor—RIMON
        4. 10.2.2.4 Setting Output Voltage Ramp Time—(tdVdT)
          1. 10.2.2.4.1 Case 1: Start-Up Without Load—Only Output Capacitance C(OUT) Draws Current During Start-Up
          2. 10.2.2.4.2 Case 2: Start-Up With Load—Output Capacitance C(OUT) and Load Draws Current During Start-Up
          3. 10.2.2.4.3 Support Component Selections—RFLTb and C(IN)
      3. 10.2.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 Acive ORing Operation
      2. 10.3.2 Field Supply Protection in PLC, DCS I/O Modules
      3. 10.3.3 Simple 24-V Power Supply Path Protection
    4. 10.4 Do's and Dont's
  11. 11Power Supply Recommendations
    1. 11.1 Transient Protection
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Support Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

7.5 Electrical Characteristics

–40°C ≤ TA = TJ ≤ +125°C, V(IN) = 24 V, V(SHDN) = 2 V, R(ILIM) = 120 kΩ, IMON = FLT = OPEN, C(OUT) = 1 μF, C(dVdT) = OPEN. (All voltages referenced to GND, (unless otherwise noted))
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE
V(IN) Operating input voltage 4.2 42 V
V(PORR) Internal POR threshold, rising 3.9 4 4.1 V
V(PORHys) Internal POR hysteresis 250 275 300 mV
IQ(ON) Supply current Enabled: V(SHDN) = 2 V 190 300 390 µA
IQ(OFF) V(SHDN) = 0 V 11 20 33 µA
I(VINR) Reverse input supply current V(IN) = –42 V, V(OUT) = 0 V 66 µA
UNDERVOLTAGE LOCKOUT (UVLO) INPUT
V(IN_UVLO) Factory set V(IN) undervoltage trip level V(IN) rising, V(UVLO) = 0 V 14.25 14.9 15.75 V
V(IN) falling, V(UVLO) = 0 V 13.25 13.8 14.75
V(SEL_UVLO) Internal UVLO select threshold 180 200 240 mV
V(UVLOR) UVLO threshold voltage, rising 1.175 1.19 1.225 V
V(UVLOF) UVLO threshold voltage, falling 1.08 1.1 1.125 V
I(UVLO) UVLO input leakage current 0 V ≤ V(UVLO) ≤ 42 V –100 0 100 nA
LOW IQ SHUTDOWN (SHDN) INPUT
V(SHDN) Output voltage I(SHDN) = 0.1 µA 2 2.7 3.4 V
V(SHUTF) SHDN threshold voltage for low IQ shutdown, falling 0.55 0.76 0.94 V
I(SHDN) Leakage current V(SHDN) = 0.4 V –10 µA
OVERVOLTAGE PROTECTION (OVP) INPUT
V(IN_OVP) Factory set V(IN) overvoltage trip level V(IN) rising, V(OVP) = 0 V 31 32.6 34 V
V(IN) falling, V(OVP) = 0 V 28.5 30.3 31.5
V(SEL_OVP) Internal OVP select threshold 180 200 240 mV
V(OVPR) Overvoltage threshold voltage, rising 1.17 1.19 1.225 V
V(OVPF) Overvoltage threshold, falling 1.085 1.1 1.125 V
I(OVP) OVP input leakage current 0 V ≤ V(OVP) ≤ 4 V –100 0 100 nA
OUTPUT RAMP CONTROL (dVdT)
I(dVdT) dVdT charging current V(dVdT) = 0 V 4 4.7 5.5 µA
R(dVdT) dVdT discharging resistance V(SHDN) = 0 V, with I(dVdT) = 10 mA sinking 14 Ω
GAIN(dVdT) dVdT to OUT gain V(OUT)/V(dVdT) 23.75 24.6 25.5 V/V
CURRENT LIMIT PROGRAMMING (ILIM)
V(ILIM) ILIM bias voltage 1 V
I(OL) Overload current limit R(ILIM) = 120 kΩ, V(IN) – V(OUT) = 1 V 0.085 0.1 0.115 A
R(ILIM) = 12 kΩ, V(IN) – V(OUT) = 1 V 0.95 1 1.05
R(ILIM) = 8 kΩ, V(IN) – V(OUT) = 1 V 1.425 1.5 1.575
R(ILIM) = 5.36 kΩ, V(IN) – V(OUT) = 1 V 2.11 2.23 2.35
I(OL_R-OPEN) R(ILIM) = OPEN, open resistor current limit (single point failure test: UL60950) 0.055
I(OL_R-SHORT) R(ILIM) = SHORT, shorted resistor current limit (single point failure test: UL60950) 0.095
I(CB) Circuit breaker detection threshold R(ILIM) = 120 kΩ, MODE = open 0.045 0.073 0.11 A
R(ILIM) = 5.36 kΩ, MODE = open 2 2.21 2.4
–40°C ≤ TA = TJ ≤ +125°C, V(IN) = 24 V, V(SHDN) = 2 V, R(ILIM) = 120 kΩ, IMON = FLT = OPEN, C(OUT) = 1 μF, C(dVdT) = OPEN. (All voltages referenced to GND, (unless otherwise noted))
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I(SCL)

Short-circuit current limit

 R(ILIM) = 120 kΩ, V(IN) – V(OUT) = 5 V 0.08 0.1 0.12 A
R(ILIM) = 8 kΩ, V(IN) – V(OUT) = 5 V 1.425 1.5 1.575
R(ILIM) = 5.36 kΩ, V(IN) – V(OUT) = 5 V 2.11 2.23 2.35
I(FASTRIP) Fast-trip comparator threshold 1.87 × I(OL) + 0.015 A
CURRENT MONITOR OUTPUT (IMON)
GAIN(IMON) Gain factor I(IMON): I(OUT) 0.1 A ≤ I(OUT) ≤ 2 A 72 78.28 85 µA/A
PASS FET OUTPUT (OUT)
RON IN to OUT total ON resistance 0.1 A ≤ I(OUT) ≤ 2 A, TJ = 25°C 140 150 160 mΩ
0.1 A ≤ I(OUT) ≤ 2 A, TJ = 85°C 210
0.1 A ≤ I(OUT) ≤ 2 A, –40°C ≤ TJ ≤

+125°C

 80 150 250
Ilkg(OUT) OUT leakage current in Off state V(IN) = 42 V, V(SHDN)= 0 V, V(OUT) = 0 V, sourcing 12 µA
V(IN) = 0 V, V(SHDN)= 0 V, V(OUT) = 24 V, sinking 11
V(IN) = –42 V, V(SHDN)= 0 V, V(OUT) = 0 V, sinking 50
V(REVTH) V(IN) – V(OUT) threshold for reverse protection comparator, falling –15 –10 –5 mV
V(FWDTH) V(IN) – V(OUT) threshold for reverse protection comparator, rising 85 96 110 mV
FAULT FLAG (FLT): ACTIVE LOW
R(FLT) FLT pull-down resistance V(OVP) = 2 V, I(FLT) = 5 mA sinking 40 85 160 Ω
I(FLT) FLT input leakage current 0 V ≤ V(FLT) ≤ 42 V –200 200 nA
THERMAL SHUT DOWN (TSD)
T(TSD) TSD threshold, rising 157 ºC
T(TSDhyst) TSD hysteresis 10 ºC
MODE
MODE_SEL Thermal fault mode selection MODE = 402 kΩ to RTN Current limiting with latch
MODE = Open Circuit breaker mode with auto-retry
MODE = Short to RTN Current limiting with auto-retry