TC1055

Features:

· Extremely Low Ground Current for Longer Battery Life
· Very Low Dropout Voltage
· Choice of 50mA (TC1054), 100mA (TC1055) and 150mA (TC1186) Output
· High Output Voltage Accuracy
· Standard or Custom Output Voltages
· Power-Saving Shutdown Mode
· ERROR Output Can Be Used as a Low Battery Detector, or Processor Reset Generator
· Over Current and Over Temperature Protection
· Space-Saving 5-Pin SOT-23A Package
· Pin Compatible Upgrades for Bipolar Regulators

Application

· Battery Operated Systems
· Portable Computers
· Medical Instruments
· Instrumentation
· Cellular/GSM/PHS Phones
· Linear Post-Regulators for SMPS
· Pagers

Pinout






Specifications

Parameter NameValueMax Input Voltage6Output Voltage (v)1.8, 2.5, 2.7, 2.8, 2.85, 3.0, 3.3, 3.6, 4.0, 5.0Typical Active Current (A)50Typical Dropout Voltage @ Max. lout (mV)180Typical Output Voltage Accuracy (%)0.5Output Capacitor TypeAluminum/Tantalum




Description

The TC1054, TC1055, and TC1186 are high accuracy (typically ±0.5%) CMOS upgrades for older (bipolar) low dropout regulators. Designed specifically for battery-operated systems, the devices' CMOS construction eliminates wasted ground current, significantly extending battery life. Total supply current is typically 50A at full load (20 to 60 times lower than in bipolar regulators!). The devices' key features include ultra low noise operation, very low dropout voltage - typically 85mV (TC1054); 180mV (TC1055); and 270mV (TC1186) at full load - and fast response to step changes in load. An error output (ERROR) is asserted when the devices are out-of-regulation (due to a low input voltage 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). Supply current is reduced to 0.5A (max) and both VOUT and ERROR are disabled when the shut-down input is low. The devices incorporate both over-temperature and over-current protection. The TC1054, TC1055, and TC1186 are stable with an output capacitor of only 1F and have a maximum output current of 50mA, 100mA, and 150mA, respectively. For higher output current regulators, please see the TC1173 (IOUT = 300mA) data sheet.