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SIMPLIFIED SCHEMATIC EFFICIENCY vs LOAD CURRENT

By Boot Recharge Fet

Abstract

The TPS54340 is a 42 V, 3.5 A, step down regulator with an integrated high side MOSFET. The device survives load dump pulses up to 45 V per ISO 7637. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode reduces the no load supply current to 146 μA. Shutdown supply current is reduced to 1 μA when the enable pin is pulled low. Undervoltage lockout is internally set at 4.3 V but can be increased using the enable pin. The output voltage start up ramp is internally controlled to provide a controlled start up and eliminate overshoot. A wide switching frequency range allows either efficiency or external component size to be optimized. Frequency foldback and thermal shutdown protects internal and external components during an overload condition. The TPS54340 is available in an 8-pin thermally enhanced HSOIC PowerPAD ™ package

Topics: fsw = 600 kHz
Year: 2012
OAI identifier: oai:CiteSeerX.psu:10.1.1.370.6477
Provided by: CiteSeerX
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