TPS5420 Step-Down Converters

TPS5420 Step-Down Converters

Texas Instruments' TPS5420 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 is 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 TPS5420 feedback loop is internally compensated.

The TPS5420 device is available in an easy to use 8-pin SOIC package. TI provides evaluation modules and the Designer software tool to aid in quickly achieving high-performance power supply designs to meet aggressive equipment development cycles.

Features
  • Wide input voltage range: 5.5 V to 36 V
  • Up to 2 A continuous (3 A peak) output current
  • High efficiency up to 95% 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 parts count
  • Fixed 500 kHz switching frequency for small filter size
  • Improved line regulation and transient response by input voltage feed forward
  • System protected by over current limiting, overvoltage protection, and thermal shutdown
  • -40°C to ±125°C operating junction temperature range
  • Available in small 8-pin SOIC package
Applications
  • Consumer: set-top box, DVD, LCD displays
  • Industrial and car audio power supplies
  • Battery chargers, high power LED supplies
  • 12 V/24 V distributed power systems
Manufacturer