SC1454 Datasheet | SEMTECH

Description The SC1454 contains two ultra low dropout voltage regulators (ULDOs). It operates from an input voltage range of 2.25V to 6.5V, and a wide variety of output voltage options are available. One ULDO has a fixed output, and the other is either fixed (SETA pin grounded) or adjustable using external resistors. Each ULDO has an independent enable pin. Dual 150m A Ultra Low Dropout, Low Noise Regulator Features Up to 150m A per regulator output Low quiescent current Low dropout voltage Stable operation with ceramic caps Very low 50µVRMS output noise Wide selection of output voltages Tight load and line regulation Current and thermal limiting Reverse input polarity protection <1.5u A off-mode current Logic controlled enable Designed specifically for battery operated systems, the devices utilize CMOS technology to require very low operating currents (typically 130µA with both outputs supplying 150m A). In addition, the dropout voltage is typically 155m V at 150m A, helping to prolong battery life further. The devices are designed to provide 400m A of peak current for applications which require high initial inrush current. They have been designed to be used with low ESR ceramic capacitors to save cost and PCB area. The SC1454 is available with a wide variety of voltage options as standard. It es in the tiny 8 lead MSOP surface mount package. u u u u u u u The SC1454 has a bypass pin to enable the user to u capacitively decouple the bandgap reference for very low u u output noise (50µVRMS typically). u u u u u u u Applications Cellular telephones Palmtop/Laptop puters Battery-powered equipment Bar code scanners SMPS post regulator/dc to dc modules High efficiency linear power supplies Typical Application Circuit U1 SC1454DIMS OUTPUT A: 3.0V OUTPUT B: 3.0V 1 2 3 4 C1 1u F C2 1u F OUTA OUTB GND SETA IN ENA BYP ENB 8 7 6 5 C3 10n F ENABLE OUTPUT B C4 1u F VIN ENABLE OUTPUT A U1 OUTPUT A: 2.5V OUTPUT B: 2.8V R1 100k 1 2 3 4 SC1454CIMS IN ENA BYP ENB 8 7 6 5 ENABLE...