资 源 简 介
The LM2831 regulator is a monolithic, high frequency, PWMstep-down DC/DC converter in a 5 pin SOT23 and a 6 PinLLP package. It provides all the acTIve funcTIons to providelocal DC/DC conversion with fast transient response andaccurate regulaTIon in the smallest possible PCB area. Witha minimum of external components, the LM2831 is easy touse. The ability to drive 1.5A loads with an internal 130 mΩPMOS switch using state-of-the-art 0.5 μm BiCMOS technologyresults in the best power density available. The worldclasscontrol circuitry allows on-TImes as low as 30ns, thussupporting exceptionally high frequency conversion over theentire 3V to 5.5V input operating range down to the minimumoutput voltage of 0.6V. Switching frequency is internally setto 550 kHz, 1.6 MHz, or 3.0 MHz, allowing the use ofextremely small surface mount inductors and chip capacitors.Even though the operating frequency is high, efficienciesup to 93% are easy to achieve. External shutdown isincluded, featuring an ultra-low stand-by current of 30 nA.The LM2831 utilizes current-mode control and internal compensationto provide high-performance regulation over awide range of operating conditions. Additional features includeinternal soft-start circuitry to reduce inrush current,pulse-by-pulse current limit, thermal shutdown, and outputover-voltage protection.
