LM2675N-12

The LM2675N-12 series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down switching regulator, capable of driving a 1A load current with excellent line and load regulation. These devices are avail-able in fixed output voltages of 12V, and an adjustable output version. Requiring a minimum number of external components. these regulators are simple to use and include patented internal frequency compensation (Patent Nos. 5,382,918 and and a fixed frequency oscillator. The LM2675 series operates at a switching frequency of 260 thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency the copper traces on the printed circuit board are the only heat sinking needed. A family of standard inductors for use with the LM2675 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the datasheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies. Other features include a guaranteed tolerance on output voltage within specified input voltages and output load conditions, and i10% on the oscillator frequency. ternal shutdown is included, featuring typically 50 A stand-by current. The output switch includes current limiting. as well as thermal shutdown for full protection under fault conditions.

The features of LM2675N-12 can be summarized as (1)efficiency up to 96%; (2)available in 8-pln DIP and packages; (3)computer design software LM257X made simple (version); (4)simple and easy to design with; (5)requires only 5 ettemal components; (6)uses readily available standard inducturs; (7)12V, and adiuslable outpul versions; (8)Adjustable version output voltage range: 1.21V to 37V; (9)max output voltage tolerance over line and load conditions; (10)guaranteed 1A output load current; (11)DMOS output switch; (12)wide input voltage range: 8V to 40V; (13)260 kHz fixed frequency internal oscillator; (14)shutdown capability, low power standby mode; (15)thermal shutdown and current limit protection.

The absolute maximum ratings of LM2675N-12 are (1)supply voltage: 45V; (2)ONIF pin voltage VSH: 6V; (3)switch voltage to ground: -1V; (4)boost pin voltage: Vsw + 8V; (5)feedback pin voltage: -0.3V VFB14V; (6)ESD susceptibility human body model (Note): 2 kV; (7)power dissipation: internally limited; (8)storage temperature range: -65°C to +150°C; (9)lead temperature package vapor phase: +215°C, infrared: +220°C; (10)N package (soldering, 10s): +260°C; (11)LLP package (see AN-1187); (12)maximum junction temperature: +150°C; (13)junction temperature range: -40°CTJ+125°C.