TPS54140-Q1

TPS54140-Q1 www.ti.com SLVSA24C – OCTOBER 2009 – REVISED AUGUST 2012 1.5-A 42-V STEP-DOWN SWIFT™ DC/DC CONVERTER WITH Eco-mode™ CONTROL Check for Samples: TPS54140-Q1 FEATURES 1 2 Qualified for Automotive Applications 3.5-V to 42-V Input Voltage Range 200-mΩ High-Side MOSFET High Efficiency at Light Loads With Pulse- Skipping Eco-mode™ Control Scheme 116-μA Operating Quiescent Current 1.3-μA Shutdown Current 100-kHz to 2.5-MHz Switching Frequency Synchronizes to External Clock Adjustable Slow Start/Sequencing Undervoltage and Overvoltage Power-good Output Adjustable Undervoltage Lockout Voltage and Hysteresis 0.8-V Internal Voltage Reference Supported by SwitcherPro™ Software Tool (http://focus.ti.com/docs/toolsw/folders/print/s witcherpro.html) For SWIFT™ Documentation, See the TI Website at http://www.ti.com/swift APPLICATIONS 12-V and 24-V Industrial and Commercial Low Power Systems Aftermarket Automotive Accessories: Video, GPS, Entertainment DESCRIPTION The TPS54140-Q1 device is a 42-V 1.5-A step-down regulator with an integrated high-side MOSFET. Currentmode control provides simple external compensation and flexible component selection. A low-ripple pulse-skip mode reduces the no load, input supply current to 116 μA. Using the enable pin, shutdown supply current is reduced to 1.3 μA. Undervoltage lockout is internally set at 2.5 V, but can be increased using the enable pin. The output voltage startup ramp is controlled by the slow s...