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1. Description
The TPS5450DDAR is a high-output-current PWM converter that integrates a low-resistance, high-side N-channel MOSFET. Included on the substrate with the listed features are a high-performance voltage error amplifier that provides tight voltage regulation accuracy under transient conditions; an undervoltage-lockout circuit to prevent start-up until the input voltage reaches 5.5 V; an internally set slow-start circuit to limit inrush currents; and a voltage feed forward circuit to improve the transient response. Using the ENA pin, shutdown supply current is reduced to 18 μA typically. Other features include an active-high enable, overcurrent limiting, overvoltage protection and thermal shutdown. To reduce design complexity and external component count, the TPS5450 feedback loop is internally compensated. The TPS5450 device is available in a thermally- enhanced, 8-pin SOIC PowerPAD package.
2. Features
1. Wide Input Voltage Range: 5.5 V to 36 V
2. Up to 5-A Continuous (6-A Peak) Output Current
3. High Efficiency Greater Than 90% Enabled by 110-mΩ Integrated MOSFET Switch
4. Wide Output Voltage Range: Adjustable Down to 1.22 V With 1.5% Initial Accuracy
5. Internal Compensation Minimizes External Part Count
6. Fixed 500-kHz Switching Frequency for Small Filter Size
7. 18-μA Shutdown Supply Current
8. Improved Line Regulation and Transient Response by Input Voltage Feed Forward
9. System Protected by Overcurrent Limiting, Overvoltage Protection and Thermal Shutdown
10. –40°C to 125°C Operating Junction Temperature Range
11. Available in Small Thermally Enhanced 8-Pin SOIC PowerPAD™ Package
3. Applications
1. High Density Point-of-Load Regulators
2. LCD Displays, Plasma Displays
3. Battery Chargers
4. 12-V and 24-V Distributed Power Systems
4. Pin Configuration
5. Pin Functions
