Features for the TPS5450
- Wide input voltage range: 5.5 V to 36 V
- Up to 5-A continuous (6-A peak) output current
- High efficiency greater than 90% enabled by 110-mΩ integrated MOSFET switch
- Wide output voltage range: adjustable down to 1.22 V with 1.5% initial accuracy
- Internal compensation minimizes external part count
- Fixed 500-kHz switching frequency for small filter size
- 18-µA shutdown supply current
- Improved line regulation and transient response by input voltage feedforward
- System protected by overcurrent limiting, overvoltage protection, and thermal shutdown
- –40°C to 125°C operating junction temperature range
- Available in small thermally enhanced 8-pin SOIC PowerPAD™ package
Description for the TPS5450
The TPS5450 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. TI provides evaluation modules and software tool to aid in achieving high-performance power supply designs to meet aggressive equipment development cycles.