Texas Instruments DMOS 400mA Low-Dropout Regulator

The REG113 is a low noise, low difference linear voltage regulator series with low pin current. Its new DMOS topology features significant improvements over the previous design, including a low voltage drop (only 250mV at full load) and better transient performance. The REG113 is available in SOT23-5 and SOP-8 packages.

Block Diagram

In addition, no output capacitance is required for stability, unlike traditional low voltage drop regulators, which are difficult to compensate for and require expensive low ESR capacitors greater than 1 μF. Typical ground pin current is only 850 μA (at IOUT = 400mA) and drops to 10nA when disabled. Unlike regulators with PNP-pass devices, the static current remains relatively constant under overload changes and power-off conditions.

The REG113 has a very low output noise (typically 28 μVrms at VOUT = 3.3V, CNR = 0.01μF), making it ideal for portable communication devices. Maintain accuracy under temperature, line and load changes. Key parameters are tested in the specified temperature range (-40°C to +85°C). The REG113's internal circuitry provides a current limit that protects the load from damage, and in addition, the thermal protection circuit prevents the chip from being damaged by excessive temperature.