LM1578AH

The LM1578AH is a product of The LM1578A subseries.The LM1578AH is a switching regulator which can easily be set up for such DC-to-DC voltage conversion circuits as the buck, boost, and inverting configurations. The LM1578A features a unique comparator input stage which not only has separate pins for both the inverting and non-inverting inputs,but also provides an internal 1.0V reference to each input,thereby simplifying circuit design and p.c. board layout. The output can switch up to 750 mA and has output pins for its collector and emitter to promote design flexibility. An external current limit terminal may be referenced to either the ground or the Vin terminal, depending upon the application. In addition,the LM1578AH has an on board oscillator, which sets the switching frequency with a single external capacitor from <1Hz to 100 kHz (typical).The LM1578A is an improved version of the LM1578AH, offering higher maximum ratings for the total supply voltage and output transistor emitter and collector voltages.

Features of the The LM1578AH are:(1)Inverting and non-inverting feedback inputs;(2)1.0V reference at inputs;(3)Operates from supply voltages of 2V to 40V;(4)Output current up to 750 mA, saturation less than 0.9V;(5)Current limit and thermal shut down;(6)Duty cycle up to 90%.

The absolute maximum ratings of The LM1578AH can be summarized as:(1)Total Supply Voltage:50V;(2)Collector Output to Ground:-0.3V to +50V;(3)Emitter Output to Ground:-1V to +50V;(4)Power Dissipation:Internally limited;(5)Output Current:750 mA;(6)Storage Temperature:-65°C to +150°C;(7)Lead Temperature,(soldering, 10 seconds):260°C;Lead Temperature,Maximum Junction Temperature:150°C.