Half country introduce new step down stabilizator LM3102 and LM3103 synchronously
Posted on: March 30, 2011
National semiconductor (National Semiconductor Corporation) of U.S.A. Announce the intersection of PowerWise and high the intersection of efficiency and product series of company this add, step down stabilizator synchronously by two the intersection of fund and brand-new high-efficiency SIMPLE SWITCHER again. Two type these LM3102 and high integration density of LM3103 chip input voltage high to step down stabilizator synchronously while being up to 42V. LM3103 chip of LM3102 chip and 750mA of 2.5A can offer voltage regulation for digital IC and supply power, most suitable for industry’s system and telecommunication equipment. LM3100 chip of 1.5A cooperating and introducing before this, has further enriched the products battle array of U.S.A. national semi-conductive series SIMPLE SWITCHER.
Similar to high efficiency characteristic of LM3100 chip, LM3102 and LM3103 chip efficiency that these two fund introduces newly is up to 97%. The Built-in: MOSFET switching circuit cooperates with the midget inductor, can further reduce the system element number, and narrow the systematic volume.
These two step down the stabilizator adopts and turns on time (COT) fixedly The design that is controlled, does not need to offer the cycle to compensate. In addition, these two chips have adopted the electric current injection control of the flywheel (FCIC) Patented technology, thus can make use of ceramic capacitor to replace the tantalum capacitor. Like other products of U.S.A. national semi-conductive series SIMPLE SWITHCER, LM3102 and LM3103 chip is easy to use, and the design engineer can obtain support of the online WEBENCH power system design tool of the national semiconductor of U.S.A., system design of more quick completion.
Characteristic of the products
LM3102 and LM3103 step down synchronously the stabilizator of the switch is suitable for the input voltage of 4.5V to 42V, and switching frequency can be presumed by oneself, can reach as high as 1MHz. LM3102 chip can offer the electric current up to 2.5A for load, but the output voltage is low to 0.8V. LM3103 chip can offer the electric current up to 750mA, but the output voltage is low to 0.6V. Two stabilizators can both offer the remarkable voltage regulation result for circuit and load. If it is lower to support, LM3102 and LM3103 can all adopt the disconnected mode to be operated, in order to raise the efficiency. During start, they will not discharge to the bias biased output capacitor in advance, therefore can guarantee the stability of a voltage slope. In addition two chip these have programmable soft turn on, the intersection of valley point current and amplitude limit, output press protection and excessive heating, shut down the intersection of person who protect and multiple characteristic functions also.
Capsulation and price
LM3102 chip is adopted and has not sheltered and welded 20 spherical pins TSSOP to capsulate, LM3103 chip adopts the high sheltering and welding 16 spherical pins TSSOP to capsulate of heat dissipation capacity. Two chips have both already been supplied in batches. Purchase and regard 1,000 as the unit, the single pricing of LM3102 chip is 2.65 dollars, single pricing of LM3103 chip is 2.00 dollars.
Jenna Brookl 
Leave a comment