ZHCSB15B May   2013  – October 2023 TPS54531

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 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
  8. 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  Voltage Reference (Vref)
      3. 7.3.3  Bootstrap Voltage (BOOT)
      4. 7.3.4  Enable and Adjustable Input Undervoltage Lockout (VIN UVLO)
      5. 7.3.5  Programmable Slow Start Using SS Pin
      6. 7.3.6  Error Amplifier
      7. 7.3.7  Slope Compensation
      8. 7.3.8  Current-Mode Compensation Design
      9. 7.3.9  Overcurrent Protection and Frequency Shift
      10. 7.3.10 Overvoltage Transient Protection
      11. 7.3.11 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Eco-mode
      2. 7.4.2 Operation With VIN < 3.5 V
      3. 7.4.3 Operation With EN Control
  9. 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 Procedure
        1. 8.2.2.1  Custom Design With WEBENCH® Tools
        2. 8.2.2.2  Switching Frequency
        3. 8.2.2.3  Output Voltage Set Point
        4. 8.2.2.4  Undervoltage Lockout Set Point
        5. 8.2.2.5  Input Capacitors
        6. 8.2.2.6  Output Filter Components
          1. 8.2.2.6.1 Inductor Selection
          2. 8.2.2.6.2 Capacitor Selection
        7. 8.2.2.7  Compensation Components
        8. 8.2.2.8  Bootstrap Capacitor
        9. 8.2.2.9  Catch Diode
        10. 8.2.2.10 Slow-Start Capacitor
        11. 8.2.2.11 Output Voltage Limitations
        12. 8.2.2.12 Power Dissipation Estimate
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
      3. 8.4.3 Electromagnetic Interference (EMI) Considerations
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 Custom Design With WEBENCH® Tools
    2. 9.2 接收文档更新通知
    3. 9.3 支持资源
    4. 9.4 Trademarks
    5. 9.5 静电放电警告
    6. 9.6 术语表
  11. 10Mechanical, Packaging, and Orderable Information

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订购信息

6.5 Electrical Characteristics

TJ = –40°C to 150°C, VIN = 3.5V to 28V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE (VIN PIN)
Internal undervoltage lockout threshold Rising and falling 3.5 V
Shutdown supply current EN = 0 V, VIN = 12 V, –40°C to 85°C 1 4 μA
Operating – non-switching supply current VSENSE = 0.85 V 110 190 μA
ENABLE AND UVLO (EN PIN)
Enable threshold Rising and falling 1.25 1.35 V
Input current Enable threshold – 50 mV –1 μA
Input current Enable threshold + 50 mV –4 μA
VOLTAGE REFERENCE
Voltage reference 0.772 0.8 0.828 V
HIGH-SIDE MOSFET
On resistance BOOT-PH = 3 V, VIN = 3.5 V 115 200 mΩ
BOOT-PH = 6 V, VIN = 12 V 80 150
ERROR AMPLIFIER
Error amplifier transconductance (gm) –2 μA < I(COMP) < 2 μA, V(COMP) = 1 V 92 μmhos
Error amplifier DC gain(1) VSENSE = 0.8 V 800 V/V
Error amplifier unity gain bandwidth(1) 5 pF capacitance from COMP to GND pins 2.7 MHz
Error amplifier source/sink current V(COMP) = 1 V, 100-mV overdrive ±7 μA
Switch current to COMP transconductance(1) VIN = 12 V 20 A/V
SWITCHING FREQUENCY
Switching Frequency VIN = 12 V, 25°C 456 570 684 kHz
Minimum controllable on time VIN = 12 V, 25°C 105 130 ns
Maximum controllable duty ratio(1) BOOT-PH = 6 V 90% 93%
PULSE SKIPPING Eco-mode
Pulse skipping Eco-mode switch current threshold 160 mA
CURRENT LIMIT
Current-limit threshold VIN = 12 V 6.3 10.5 A
THERMAL SHUTDOWN
Thermal Shutdown 165 °C
SLOW START (SS PIN)
Charge current V(SS) = 0.4 V 2 μA
(1) Specified by design