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LM3351MM Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM3351MM Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 8 page  LM3351 Switched Capacitor Voltage Converter General Description The LM3351 is a CMOS charge-pump voltage converter which efficiently provides a 3.3V to 5V step-up, or 5V to 3.3V step-down. The LM3351 is pin for pin compatible with the LM3350 but consumes 66% less quiescent current. The LM3351 uses four small, low cost capacitors to provide the voltage conversion. It eliminates the cost, size and radiated EMI related to inductor based circuits, or the power loss of a linear regulator. Operating power conversion efficiency greater than 90% provides ideal performance for battery powered portable systems. The architecture provides a fixed voltage conversion ratio of 3/2 or 2/3. Thus it can be used for other DC-DC conversions as well. Key Specifications n 200 kHz switch frequency allows use of very small, inexpensive capacitors. n 4.2 Ω typical step-up output impedance n 1.8 Ω typical step-down output impedance n 95% typical power conversion efficiency at 50 mA n 250 nA typical shutdown current n Low quiescent current extends battary life Features n Conversion of 3.3V to 5V, or 5V to 3.3V n Small Mini SO-8 package n No inductor required Applications n Any mixed 5V and 3.3V system n Laptop computers and PDAs n Handheld instrumentation n PCMCIA cards Ordering Information Order Number Package Type NSC Package Drawing Package Marking Supplied As LM3351MMX Mini SO-8 MUA08A S05A 3500 Units on Tape and Reel LM3351MM Mini SO-8 MUA08A S05A 1000 Units on Tape and Reel Basic Operating Circuits Connection Diagram Step-Up Converter DS100146-1 Step-Down Converter DS100146-2 Mini SO8 Package DS100146-3 Top View December 1999 © 1999 National Semiconductor Corporation DS100146 www.national.com |
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