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LM2831ZSD Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM2831ZSD Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 27 page  LM2831 High Frequency 1.5A Load - Step-Down DC-DC Regulator General Description The LM2831 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 5 pin SOT23 anda6Pin LLP package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM2831 is easy to use. The ability to drive 1.5A loads with an internal 130 m Ω PMOS switch using state-of-the-art 0.5 µm BiCMOS technol- ogy results in the best power density available. The world- class control circuitry allows on-times as low as 30ns, thus supporting exceptionally high frequency conversion over the entire 3V to 5.5V input operating range down to the minimum output voltage of 0.6V. Switching frequency is internally set to 550 kHz, 1.6 MHz, or 3.0 MHz, allowing the use of extremely small surface mount inductors and chip capaci- tors. Even though the operating frequency is high, efficien- cies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30 nA. The LM2831 utilizes current-mode control and internal com- pensation to provide high-performance regulation over a wide range of operating conditions. Additional features in- clude internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection. Features n Space Saving SOT23-5 Package n Input voltage range of 3.0V to 5.5V n Output voltage range of 0.6V to 4.5V n 1.5A output current n High Switching Frequencies 1.6MHz (LM2831X) 0.55MHz (LM2831Y) 3.0MHz (LM2831Z) n 130m Ω PMOS switch n 0.6V, 2% Internal Voltage Reference n Internal soft-start n Current mode, PWM operation n Thermal Shutdown n Over voltage protection Applications n Local 5V to Vcore Step-Down Converters n Core Power in HDDs n Set-Top Boxes n USB Powered Devices n DSL Modems Typical Application Circuit 20174864 20174881 August 2006 © 2006 National Semiconductor Corporation DS201748 www.national.com |
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