Seiko Instruments CMOS Voltage Regulator Has High Ripple-Rejection and Low Dropout High Current Output
Seiko Instruments has developed the S-1172 Series positive voltage regulator integrating a super low dropout voltage, a high output voltage accuracy, and a low current consumption. The super low dropout voltage and the high output current can be attributed to the built-in transistor with low on-resistance.
The over-current protector prevents the load current from exceeding the capacitance of the output transistor while the thermal shutdown circuit prevents damage caused by heat. The rush current control circuit limits the excessive rush current during start-up. Various capacitors and small ceramic capacitors can be used for this IC more than for conventional regulator ICs that have CMOS technology. Additionally, the ON/OFF circuit ensures longer battery life.
High-density mounting can be achieved using a small SOT-89-5 package and high-heat radiation HSOP-6.
Typical features of the S-1172 Series include: an output voltage of 1.0 to 5.0V, selectable in 0.05V step; a ceramic capacitor of 4.7µF or more can be used as the I/O capacitor; an input voltage of 1.5 to 5.5V; ±1.0% (1.0 to 1.45 V output product : ±15mV); 70 mV typ. (3.0 V output product, at IOUT = 300mA); low current consumption during operation: 70µA typ., 90µA max.(3.0V output product) / during shutdown : current:typ., 1.0µA max. output product, at VIN ≥ VOUT(S) + 1.0V); output 0.1 µA 1000 mA (3.0V); high ripple rejection: 70 dB typ. (at 1.0 kHz, VOUT = 1.0V); and RoHS compliant.
Typical applications of the S-1172 include power supplies for battery-powered devices, TVs, notebook PCs and electronic home appliances
