REG103

® REG 103 REG 103 REG103 REG 103 For most current data sheet and other product information, visit www.burr-brown.com DMOS 500mA Low Dropout Regulator FEATURES q NEW DMOS TOPOLOGY: Ultra Low Dropout Voltage: 115mV typ at 500mA and 3.3V Output Output capacitor NOT required for stability q FAST TRANSIENT RESPONSE q VERY LOW NOISE: 33µVrms q HIGH ACCURACY: ±2% max q HIGH EFFICIENCY: IGND = 1mA at IOUT = 500mA Not Enabled: IGND = 0.5µA q 2.5V, 2.7V, 3.0V, 3.3V, 5.0V AND ADJUSTABLE OUTPUT VERSIONS q FOLDBACK CURRENT LIMIT q THERMAL PROTECTION q OUTPUT VOLTAGE ERROR INDICATOR(1) q SMALL SURFACE-MOUNT PACKAGES: SOT223-5, DDPAK-5, SO-8 DESCRIPTION The REG103 is a family of low noise, low dropout linear regulators with low ground pin current. Its new DMOS topology provides significant improvement over previous designs, including low dropout voltage (only 115mV typ at full load), and better transient performance. In addition, no output capacitor is required for stability, unlike conventional low dropout regulators that are difficult to compensate and require expensive low ESR capacitors greater than 1µF. Typical ground pin current is only 1mA (at IOUT = 500mA) and drops to 0.5µA in “not enabled” mode. Unlike regulators with PNP pass devices, quiescent current remains relatively constant over load variations and under dropout conditions. The REG103 has very low output noise (typically 33µVrms for VOUT = 3.3V with CNR = 0.01µF), making it ideal for use in portable communications equ...