Mountain View, Calif.-- Dec. 22, 1997--Telcom Semiconductor, Inc. announceda family of CMOS low-voltage dropout regulators aimed at battery-operated systems.
There are eight members in the family: TC1014, TC1015,TC1054, TC1055, TC1070, TC1071, TC1072, and TC1073. Designed in submicron CMOS processes, these devices are high-accuracy (typically +/-0.5 percent) CMOS upgrades for bipolar lo-dropout regulators, such as the National LP2980 and Micrel MIC5205. Unlike bipolar regulators, the devices' CMOS construction eliminates wasted ground current, thus significantly extending battery life.
All eight devices feature very low dropout voltage and ultralow noise operation. An optional bypass input on the TC1014/1015/1072/1073 further reduces noise. These devices are specifically designed to respond to step changes in load faster than most other CMOS LDOs and most bipolar regulators. They are stable with an output capacitor of only 1 uF. The TC1014/1054/1070/1072 have a maximum output current of 50 mA, and the TC1015/1055/1071/1073have a maximum output of 100 mA. All devices enter a low-power shutdown state (supply current less than 1 uA) when the shutdown input is brought low.
The error output (/ERROR) is asserted when the TC1054/1055/1072/1073 are out of regulation (usually because of low inputvoltage or excessive output current). /Error can be used as a low-battery warning or as a processor/RESET signal (with the addition of an external RC network). During shutdown, both VOUT and /ERROR are disabled.
The CMOS LDOs are ideal for battery-operated applications such asportable computers, medical instruments, cellular/GSM/PCS phones, andpagers. They are available in the space-saving SOT-23A-5 package, and are pin-compatible upgrades for the Micrel MIC5205 and National LP2980. All parts operate over a temperature range of -40 degrees C to +125 degrees C. Ten thousand piece pricing starts at $0.43.
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