AMS4123 Datasheet PDF | Advanced Monolithic Systems

Advanced Monolithic Systems AMS4123

The AMS4123 combines a 3A Step-Down converter with a 1A LDO in a single SO-8 exposed paddle package. Both the LDO and Step-Down converter are low ESR, ceramic capacitor output, stable. The Step-Down converter is internally compensated with internal soft-start to minimize the number of external components.

Part No.	AMS4123
Datasheet	AMS4123 Download
Manufacturer	Advanced Monolithic Systems
Description	3A 20V Step-Down Converter + 1A LDO
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GENERAL DESCRIPTION

An Enable pin provides built-in externally programmable power-up sequencing. The Step-Down converter enable threshold is 2.0V and the LDO enable threshold is 2.5V. It also has hiccup current limit and thermal protection. Thermal protection shuts down both the Step-Down converter and LDO when the die temperature exceeds 135°C. Both regulators are adjustable using a 0.6V reference for low output voltage settings. The LDO has options for fixed output voltages from 0.6V to 5V in 100mV steps. The LDO external input can be powered from the Step-Down converter output, for improved efficiency, or from any voltage source that is less than or equal to the device supply voltage (Vin). With a dropout voltage of less than 350mV at 1A, the AMS4123 LDO makes the perfect solution for a low noise 1.8V power source developed from 2.5V Step-Down converter output. The AMS4123 is a complete solution for LCD TV power requirements when combined with the AMS4122 (2A Dual Switching Regulator in SO-8).