AMS4123

Description

AMS4123 is a switching regulator capable to deliver up to 2A and one LDO rated for 1A output in a single SO-8 EDP package. The switching regulator is Internally Compensated internal Soft Start to reduce to minimum external components. The regulator has hiccup current limit and thermal protection. The Enable pin has built-in power-up sequencing externally programmable. If 2.0V or higher it is applied to EN pin it turns on the Switching Regulator. By increasing the voltage to 2.5V or more it turns on the LDO section. Since both circuits share one single package the thermal protection turns off both circuits when the die temperature exceeds approximately 135?C. Both regulators are adjustable using a 0.600V reference for low output voltage settings. The LDO has options for fixed output voltages from 0.6V to 5V in 100mV steps. The LDO input can be supplied from the Switching Regulator output increasing the efficiency but can supplied as well from another source that is equal or lower than the device supply voltage. With a Dropout of 400mV @1A makes AMS4123 the perfect solution for low noise 1.8V from a 2.5V source. The AMS4123 combined with AMS4122 (2A Dual Switching Regulator in SO-8) makes complete solution for LCD TV power requirements.