ZHCSHG7C January 2018 – July 2018 TPSM84209
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Adjusting the Output Voltage
- 7.3.2 Input Capacitor Selection
- 7.3.3 Undervoltage Lockout (UVLO)
- 7.3.4 Output Capacitor Selection
- 7.3.5 Feed-Forward Capacitor
- 7.3.6 Operating Range
- 7.3.7 Output Current Rating
- 7.3.8 Enable (EN)
- 7.3.9 Internal Soft Start
- 7.3.10 Safe Start-Up Into Prebiased Outputs
- 7.3.11 Light Load Efficiency / Eco-Mode
- 7.3.12 Voltage Dropout
- 7.3.13 Overcurrent Protection
- 7.3.14 Output Overvoltage Protection (OVP)
- 7.3.15 Thermal Performance
- 7.3.16 Thermal Shutdown
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
7.3.12 Voltage Dropout
Voltage dropout is the difference between the input voltage and output voltage that is required to maintain output voltage regulation while providing the rated output current.
To ensure the TPSM84209 maintains output voltage regulation over the recommended operating range, the minimum recommended input voltage is 4.5 V or (VOUT × 1.3), whichever is greater. However, the TPSM84209 does produce an output voltage when operated below the recommended input voltage range. Figure 27 shows the typical dropout voltage curves for 5-V output at TA = 25°C. (Note: As ambient temperature increases, dropout voltage and frequency foldback occur at higher input voltage.)
Figure 27. Voltage Dropout