Rev.1.1_00

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR


S-1155 Series

The S-1155 Series, developed based on CMOS technology, is a positive voltage regulator with a super low dropout voltage, high output voltage accuracy, and low current consumption. The S-1155 Series provides the very small dropout voltage and the large output current due to the built-in transistor with low on-resistance. The overcurrent protector prevents the load current from exceeding the capacitance of output transistor. The thermal shutdown circuit prevents damage caused by heat, the rush current control circuit limits the excessive rush current during start-up. The ON/OFF circuit ensures longer battery life. Various capacitors, also small ceramic capacitors, can be used for this IC more than for the conventional regulator ICs which have CMOS technology. The small package SOT-89-5 enables high-density mounting.

„ Features
• Output voltage : • Low equivalent series resistance capacitor : • Input voltage : • High-accuracy output voltage : • Low dropout voltage : • Low current consumption : 1.0 to 5.0 V, selectable in 0.05 V step. Ceramic capacitor of 4.7 µF or more can be used as the I/O capacitor. 1.5 to 5.5 V ±1.0% (1.0 to 1.45 V output product : ±15 mV) 70 mV typ. (3.0 V output product, at IOUT = 200 mA) During operation : 70 µA typ., 90 µA max. (3.0 V output product) During shutdown : 0.1 µA typ., 1.0 µA max. 500 mA (3.0 V output product, at VIN ≥ VOUT(S) + 1.0 V)*1 70 dB typ. (at 1.0 kHz, VOUT = 1.0 V) limits overcurrent of output transistor prevents damage caused by heat limits excessive rush current during start-up Longer battery life SOT-89-5

• Output current : • High ripple rejection : • Built-in overcurrent protection circuit : • Built-in thermal shutdown circuit : • Built-in rush current control circuit : • Built-in power on/off circuit : • Small package : • Lead-free product

*1. Attention should be paid to the power dissipation of the package when the output current is large.

„ Applications
• Power supply for battery-powered devices • Power supply for TV, notebook PCs and home electric appliances • Constant-voltage power supply for portable equipment

„ Packages
Package Name SOT-89-5 Package UP005-A Drawing Code Tape UP005-A Reel UP005-A

Seiko Instruments Inc.

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HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series ■ Block Diagram



























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