JAJS474F November   2010  – May 2019 TPS54618

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      概略回路図
      2.      効率と出力電流との関係
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin 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 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 and Output Current
      3. 8.3.3  Bootstrap Voltage (Boot) and Low Dropout Operation
      4. 8.3.4  Error Amplifier
      5. 8.3.5  Voltage Reference
      6. 8.3.6  Adjusting the Output Voltage
      7. 8.3.7  Enable and Adjusting Undervoltage Lockout
      8. 8.3.8  Soft-Start Pin
      9. 8.3.9  Sequencing
      10. 8.3.10 Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
      11. 8.3.11 Overcurrent Protection
      12. 8.3.12 Frequency Shift
      13. 8.3.13 Reverse Overcurrent Protection
      14. 8.3.14 Synchronize Using the RT/CLK Pin
      15. 8.3.15 Power Good (PWRGD Pin)
      16. 8.3.16 Overvoltage Transient Protection
      17. 8.3.17 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Simple Small Signal Model for Peak Current Mode Control
      2. 8.4.2 Small Signal Model for Frequency Compensation
  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 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Step One: Select the Switching Frequency
        3. 9.2.2.3 Step Two: Select the Output Inductor
        4. 9.2.2.4 Step Three: Choose the Output Capacitor
        5. 9.2.2.5 Step Four: Select the Input Capacitor
        6. 9.2.2.6 Step Five: Choose the Soft-Start Capacitor
        7. 9.2.2.7 Step Six: Select the Bootstrap Capacitor
        8. 9.2.2.8 Step Eight: Select Output Voltage and Feedback Resistors
          1. 9.2.2.8.1 Output Voltage Limitations
        9. 9.2.2.9 Step Nine: Select Loop Compensation Components
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Power Dissipation Estimate
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 デバイス・サポート
      1. 12.1.1 開発サポート
      2. 12.1.2 WEBENCH®ツールによるカスタム設計
    2. 12.2 ドキュメントの更新通知を受け取る方法
    3. 12.3 コミュニティ・リソース
    4. 12.4 商標
    5. 12.5 静電気放電に関する注意事項
    6. 12.6 Glossary
  13. 13メカニカル、パッケージ、および注文情報

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

7.5 Electrical Characteristics

at TJ = –40°C to 150°C, VIN = 2.95 to 6 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE (VIN PIN)
Operating input voltage 2.95 6 V
Internal undervoltage lockout threshold VIN UVLO STOP 2.28 2.5 V
VIN UVLO START 2.45 2.6
Shutdown supply current EN = 0 V, 25°C, 2.95 V ≤ VIN ≤ 6 V 5.5 15 μA
Quiescent current, Iq VSENSE = 0.9 V, VIN = 5 V, 25°C, RT = 400 kΩ 515 650 μA
ENABLE AND UVLO (EN PIN)
Enable threshold Rising 1.25 V
Falling 1.18
Input current Enable threshold + 50 mV –3.5 μA
Enable threshold – 50 mV –1.9
VOLTAGE REFERENCE (VSENSE PIN)
Voltage reference 2.95 V ≤ VIN ≤ 6 V, –40°C <TJ < 150°C 0.791 0.799 0.807 V
MOSFET
High-side switch resistance BOOT-PH = 5 V 12 25 mΩ
BOOT-PH = 2.95 V 16 33
Low-side switch resistance VIN = 5 V 13 25 mΩ
VIN = 2.95 V 17 33
ERROR AMPLIFIER
Input current 2 nA
Error amplifier transconductance (gm) –2 μA < I(COMP) < 2 μA, V(COMP) = 1 V 245 μmhos
Error amplifier transconductance (gm)
during slow-start		 –2 μA < I(COMP) < 2 μA, V(COMP) = 1 V,
Vsense = 0.4 V		 79 μmhos
Error amplifier source/sink V(COMP) = 1 V, 100-mV overdrive ±20 μA
COMP to Iswitch gm 25 A/V
CURRENT LIMIT
Current limit threshold VIN = 6 V, 25°C < TJ < 150°C 7.46 10.6 15.3 A
VIN = 2.95 V, 25°C < TJ < 150°C 7.68 10.2 13.5
THERMAL SHUTDOWN
Thermal shutdown 168 °C
Hysteresis 20 °C
BOOT (BOOT PIN)
BOOT charge resistance VIN = 5 V 16 Ω
BOOT-PH UVLO VIN = 2.95 V 2.1 V
SLOW-START AND TRACKING (SS/TR PIN)
Charge current V(SS/TR) = 0.4 V 2 μA
SS/TR to VSENSE matching V(SS/TR) = 0.4 V 54 mV
SS/TR to reference crossover 98% normal 1.1 V
SS/TR discharge voltage (Overload) VSENSE = 0 V 61 mV
SS/TR discharge current (Overload) VSENSE = 0 V, V(SS/TR) = 0.4 V 350 µA
SS discharge current (UVLO, EN, Thermal fault) VIN = 5 V, V(SS) = 0.5 V 1.9 mA
POWER GOOD (PWRGD PIN)
VSENSE threshold VSENSE falling (Fault) 91% Vre
VSENSE rising (Good) 93%
VSENSE rising (Fault) 109%
VSENSE falling (Good) 107%
Hysteresis VSENSE falling 2% Vref
Output high leakage VSENSE = VREF, V(PWRGD) = 5.5 V 7 nA
ON-resistance 56 100 Ω
Output low I(PWRGD) = 3 mA 0.2 0.3 V
Minimum VIN for valid output V(PWRGD) < 0.5 V at 100 μA 0.65 1.5 V