The REG113 is a family of low-noise, low-dropout linearregulators with low ground pin current. Its new DMOS topologyprovides significant improvement over previous designs,including low-dropout voltage (only 250mV typ at full load),and better transient performance. In addition, no outputcapacitor is required for stability, unlike conventional lowdropoutregulators that are difficult to compensate and requireexpensive low ESR capacitors greater than 1µF.
Typical ground pin current is only 850µA (at IOUT = 400mA)and drops to 10nA when not enabled. Unlike regulators withPNP pass devices, quiescent current remains relatively constantover load variations and under dropout conditions.
The REG113 has very low output noise (typically 28µVrmsfor VOUT = 3.3V with CNR = 0.01µF), making it ideal for usein portable communications equipment. Accuracy is maintainedover temperature, line, and load variations. Keyparameters are tested over the specified temperature range(–40°C to +85°C).
The REG113 is well protected—internal circuitry provides acurrent limit which protects the load from damage, furthermore,thermal protection circuitry keeps the chip from beingdamaged by excessive temperature. The REG113 is availablein SOT23-5 and MSOP-8 packages.
CAP-FREE DMOS TOPOLOGY: Ultra Low Dropout Voltage: 250mV typ at 400mA Output Capacitor not Required for Stability
UP TO 500mA PEAK, TYPICAL
FAST TRANSIENT RESPONSE
VERY LOW NOISE: 28µVrms
HIGH ACCURACY: ±1.5% max
HIGH EFFICIENCY: IGND = 850µA at IOUT = 400mA Not Enabled: IGND = 0.01µA