LM3475

LM3475 Hysteretic PFET Buck Controller October 2004 LM3475 Hysteretic PFET Buck Controller General Description The LM3475 is a hysteretic P-FET buck controller designed to support a wide range of high efficiency applications in a very small SOT23-5 package. The hysteretic control scheme has several advantages, including simple system design with no external compensation, stable operation with a wide range of components, and extremely fast transient response. Hysteretic control also provides high efficiency operation, even at light loads. The PFET architecture allows for low component count as well as 100% duty cycle and ultralow dropout operation. Features n n n n n n n n n Easy to use control methodology 0.8V to VIN adjustable output range High Efficiency (90% typical) ± 0.9% ( ± 1.5% over temp) feedback voltage 100% duty cycle capable Maximum operating frequency up to 2MHz Internal Soft-Start Enable pin SOT23-5 package Applications n n n n n n n TFT Monitor Auto PC Vehicle Security Navigation Systems Notebook Standby Supply Battery Powered Portable Applications Distributed Power Systems Typical Application Circuit 20070101 © 2004 National Semiconductor Corporation DS200701 www.national.com LM3475 Connection Diagram Top View 20070102 5 Lead Plastic SOT23-5 NS package Number MF05A Package Marking and Ordering Information Order Number LM3475MF LM3475MFX Package Type SOT23-5 SOT23-5 Package Marking S65B S65B Supplied As: 1000 units on Tape and Reel 3000 units on T...