TC1054

Features:

· Zero Ground Current for Longer Battery Life
· Very Low Dropout Voltage
· Guaranteed 50mA Output
· High Output Voltage Accuracy
· Standard or Custom Output Voltages
· Power-Saving Shutdown Mode
· ERROROutput can be Used as a Low Battery
· Detector, or Processor Reset Generator
· Over-Current and Over-Temperature Protection
· Space-Saving SOT-23A-5 Package
· Pin Compatible Upgrades for Bipolar Regulators

Application

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

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)85Typical Output Voltage Accuracy (%)0.5Output Capacitor TypeAluminum/Tantalum

Parameter Name	Value
Max Input Voltage	6
Output Voltage (v)	1.8, 2.5, 2.7, 2.8, 2.85, 3.0, 3.3, 3.6, 4.0, 5.0
Typical Active Current (A)	50
Typical Dropout Voltage @ Max. lout (mV)	85
Typical Output Voltage Accuracy (%)	0.5
Output Capacitor Type	Aluminum/Tantalum

Input Voltage.................................................................7V
Output Voltage ............................. ( 0.3V) to (V_IN + 0.3V)
Power Dissipation ....................Internally Limited (Note 7)
Operating Temperature Range ........... 40 < T_J < 125
Storage Temperature............................... 65 to +150
Maximum Voltage on Any Pin...............V_IN +0.3V to 0.3V
Lead Temperature (Soldering, 10 Sec.)...................+260

*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied.

Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.

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.