LM26400Y Datasheet | National Semiconductor

Description The LM26400Y is a monolithic, two-output fixed frequency PWM step-down DC/DC regulator in a 16-pin LLP or thermally enhanced ETSSOP package. With a minimum number of external ponents and internal loop pensation, the LM26400Y is easy to use. The ability to drive 2A loads with an internal 175mΩ NMOS switch using state-of-the-art 0.5µm Bi CMOS technology results in a high-power density design. The world class control circuitry allows for an ON-time as low as 40 ns, thus supporting high-frequency conversion over the entire input range of 3V to 20V and down to an output voltage of only 0.6V. The LM26400Y utilizes peak current-mode control and internal pensation to provide high-performance regulation over a wide range of line and load conditions. Switching frequency is internally set to 500k Hz, optimal for a broad range of applications in terms of size versus thermal tradeoffs. Given a non-synchronous architecture, efficiencies above 90% are easy to achieve. External shutdown is included, enabling separate turn-on and turn-off of the two channels. Additional features include programmable soft-start circuitry to reduce inrush current, pulse-by-pulse current limit and frequency foldback, integrated bootstrap structure and thermal shutdown. Features - - - - - - - - - - - - - Input voltage range of 3-20V Dual 2A output Output voltage down to 0.6V Internal pensation 500k Hz PWM frequency Separate enable pins Separate soft start pins Frequency foldback protection 175mΩ NMOS switch Integrated bootstrap diodes Over-current protection ETSSOP and LLP packages Thermal shutdown Applications - - - - - - - DTV-LCD Set-Top Box XDSL Automotive puting Peripherals Industrial Controls Point of Load Typical Application © 2007 National Semiconductor Corporation .national. Connection Diagrams 16-Lead ETSSOP (top view) 16-Lead LLP (top view) NS Package Drawing MXA16A NS Package Drawing SDA16A Ordering Information Order Number...