LM3488 Datasheet | National Semiconductor

LM3488 High Efficiency Low-Side N-Channel Controller for Switching Regulators May 2003 LM3488 High Efficiency Low-Side N-Channel Controller for Switching Regulators General Description The LM3488 is a versatile Low-Side N-FET high performance controller for switching regulators. It is suitable for use in topologies requiring low side FET, such as boost, flyback, SEPIC, etc. Moreover, the LM3488 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of LM3488 can be adjusted to any value between 100k Hz and 1MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor. The LM3488 has built in Features such as thermal shutdown, short-circuit protection and over voltage protection. Power saving shutdown mode reduces the total supply current to 5µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up. n ± 1.5% (over temperature) internal reference n 5µA shutdown current (over temperature) Features 8-lead Mini-SO8 (MSOP-8) package Internal push-pull driver with 1A peak current capability Current limit and thermal shutdown Frequency pensation optimized with a capacitor and a resistor n Internal softstart n Current Mode Operation n Undervoltage Lockout with hysteresis n n n n Applications n Distributed Power Systems n Notebook, PDA, Digital Camera, and other Portable Applications n Offline Power Supplies n Set-Top Boxes Key Specifications n Wide supply voltage range of 2.97V to 40V n 100k Hz to 1MHz Adjustable and Synchronizable clock frequency Typical Application Circuit Typical SEPIC Converter © 2003 National Semiconductor Corporation DS101388 .national. Connection Diagram 8 Lead Mini SO8 Package (MSOP-8...