LDO Regulators Limit Current Internally

Internal current limit, thermal protection, and logic-controlled shutdown circuits are features of the LD2979 and LD2980 low-dropout (LDO) regulators for low-noise, low-power portable system applications. The 50-mA regulators offer dropout voltages of 0.2V (LD2979) and 0.12V (LD2980). For the LD2979, quiescent current is 500 µA typical at 50-mA load, while the LD2980 is specified at 375 µA at the same load and no more than 1 µA maximum in its off mode. For both families, supply voltage rejection is typically 63 dB and the only external component required is a 1-µF capacitor. Fixed outputs are 2.85V, 3V, 3.2V, 3.3V, 3.8V and 5V.