TPS5450DDA

TPS5450DDA Description

A low-resistance, high-side N-channel MOSFET is included into the TPS5450, a high-output-current PWM converter. A high-performance voltage error amplifier, an undervoltage lockout circuit, an internally set slow-start circuit to limit inrush currents, and a voltage feedforward circuit to enhance the transient response are all included on the substrate along with the aforementioned features. They also provide tight voltage regulation accuracy under transient conditions.

Shutdown supply current is normally decreased to 18 A using the ENA pin. An active-high enable, overcurrent limiting, overvoltage protection, and thermal shutdown are further features. The TPS5450 feedback loop is internally adjusted to lower design complexity and external component count.

TPS5450DDA Features

• 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-m? 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

TPS5450DDA Applications

• High density point-of-load regulators

• LCD displays, plasma displays

• Battery chargers

• 12-V and 24-V distributed power systems