ZHCS990C June   2012  – September 2021 TPS54719

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  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 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 And Output Current
      3. 7.3.3 Bootstrap Voltage (Boot) And Low Dropout Operation
      4. 7.3.4 Error Amplifier
      5. 7.3.5 Voltage Reference
      6. 7.3.6 Adjusting The Output Voltage
      7. 7.3.7 Enable and Adjusting Undervoltage Lockout
      8. 7.3.8 Slow Start/Tracking Pin
      9. 7.3.9 Sequencing
    4. 7.4 Device Functional Modes
      1. 7.4.1  Constant Switching Frequency And Timing Resistor (RT Pin)
      2. 7.4.2  Overcurrent Protection
      3. 7.4.3  Frequency Shift
      4. 7.4.4  Reverse Overcurrent Protection
      5. 7.4.5  Power Good (PWRGD Pin)
      6. 7.4.6  Overvoltage Transient Protection
      7. 7.4.7  Thermal Shutdown
      8. 7.4.8  Small Signal Model For Loop Response
      9. 7.4.9  Simple Small Signal Model For Peak Current Mode Control
      10. 7.4.10 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 High Frequency, 1.8-V Output Power Supply Design With Adjusted UVLO
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 Selecting The Switching Frequency
        2. 8.2.3.2 Output Inductor Selection
        3. 8.2.3.3 Output Capacitor
        4. 8.2.3.4 Input Capacitor
        5. 8.2.3.5 Slow-Start Capacitor
        6. 8.2.3.6 Bootstrap Capacitor Selection
        7. 8.2.3.7 Undervoltage Lockout Set Point
        8. 8.2.3.8 Output Voltage And Feedback Resistors Selection
        9. 8.2.3.9 Compensation
      4. 8.2.4 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
      1. 10.2.1 Power Dissipation Estimate
  11. 11Device and Documentation Support
    1. 11.1 接收文档更新通知
    2. 11.2 支持资源
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 术语表
  12. 12Mechanical, Packaging, and Orderable Information

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6.5 Electrical Characteristics

TJ = –40°C to 140°C, VIN = 2.95 to 6 V (unless otherwise noted)
DESCRIPTIONCONDITIONSMINTYPMAXUNIT
SUPPLY VOLTAGE (VIN PIN)
Operating input voltage2.956V
Internal undervoltage lockout thresholdRising VIN2.42.8V
Internal UVLO hysteresis0.2V
Shutdown supply currentEN = 0 V, 2.95 V ≤ VIN ≤ 6 V15μA
Quiescent current – IqVSENSE = 620 mV, RT = 84 kΩ455550μA
ENABLE AND UVLO (EN PIN)
Enable thresholdRising1.161.251.37V
Falling1.18
Input currentEnable threshold + 50 mV-3.6μA
Enable threshold – 50 mV-0.7
VOLTAGE REFERENCE (VSENSE PIN)
Voltage reference2.95 V ≤ VIN ≤ 6 V, –40°C <TJ < 140°C0.5910.6000.609V
25°C0.5940.6000.606
MOSFET
High-side switch resistanceBOOT-PH = 5 V; TJ = 25°C2660mΩ
BOOT-PH = 2.95 V; TJ = 25°C3570
Low-side switch resistanceVIN = 5 V; TJ = 25°C2660mΩ
VIN = 2.95 V; TJ = 25°C3570
ERROR AMPLIFIER
Input current50nA
Error amplifier transconductance (gm)–2 μA < I(COMP) < 2 μA, V(COMP) = 1 V250μmhos
Error amplifier transconductance (gm) during slow start–2 μA < I(COMP) < 2 μA, V(COMP) = 0.9 V,
Vsense = 0.3 V		85μmhos
Error amplifier source/sinkV(COMP) = 1 V, 100 mV overdrive±20μA
COMP to Iswitch gm25A/V
CURRENT LIMIT
Current limit threshold8.510.5A
Low-side reverse current limit–1.5–2.7A
THERMAL SHUTDOWN
Thermalshutdown150155°C
Hysteresis7.5°C
TIMING RESISTOR (RT PIN)
Switching frequency range using RT mode2002000kHz
Switching frequencyRT = 84 kΩ400490600kHz
BOOT (BOOT PIN)
BOOT charge resistanceVIN = 5 V15Ω
BOOT-PH UVLOVIN = 2.95 V2.12.75V
SLOW START / TRACKING (SS/TR PIN)
Charge currentV(SS) = 0.3 V2.4μA
SS/TR to VSENSE matchingVSSTR = 0.3 V73115mV
SS to reference crossover98% nominal0.87V
SS discharge current (overload)VSENSE = 0 V, VSS = 0.3 V70μA
SS discharge voltage (overload)VSENSE = 0 V80mV
SS discharge current
(UVLO, EN, thermal fault)		VIN = 5 V, V(SS) = 0.5 V1.2mA
POWER GOOD (PWRGD PIN)
VSENSE thresholdVSENSE rising (Good)93% Vref
VSENSE rising (Fault)110% Vref
HysteresisVSENSE falling2% Vref
Output high leakageVSENSE = VREF, V(PWRGD) = 5.5 V100nA
On resistanceVIN = 5 V, TJ = 25°C78Ω
Minimum VIN for valid outputV(PWRGD) < 0.5 V at 100 μA0.8V