I have dissected an old device and found a lot of “ancient” chips. One of them is BA6418N - a H-bridge. I want to use it for something because I love the SIP package (for no particular reason - it simply looks cool). But there is a thing in the datasheet I don’t understand. They claim maximum output current it 0.7A:
But they also say maximum power dissipation is 800mW only (at 25°C).
But from the electrical characteristics the saturation voltage is 1.2V at 200mA. 700mA*1.2V > 800mW, and I did not consider the saturation voltage will be surely higher at 700mA.
What is worse is the supply current. Typical value for Icc_1 (the logic section) is 34mA and the Icc_2 is 54mA at no load conditions. This mean the total current consumption at no load conditions is more than 80mA - the quiescent current of the device alone exceeds the abs. max power dissipation when supply voltage is more than 10V! It can provide no current to the motor despite recommended voltage range is up to 15V. Do you have an idea how is this device supposed to be used? Did I miss something in the datasheet?
BA6418N Motor driver.pdf (61.6 KB)