100mA CMOS LDO WITH SHUTDOWN
AND ERROR OUTPUT
PRELIMINARY INFORMATION
TC1055
TC1055
100mA CMOS LDO WITH SHUTDOWN AND ERROR OUTPUT
GENERAL DESCRIPTION
FEATURES
TheTC1055isahighaccuracy(typically±0.5%)CMOS
upgrade for older (bipolar) low dropout regulators. De-
signed specifically for battery-operated systems, the
TC1055’s CMOS construction eliminates wasted ground
current, significantly extending battery life. Total supply
current is typically 50µA at full load (20 to 60 times lower
than in bipolar regulators!).
TC1055 key features include ultra low noise operation,
very low dropout voltage (typically 200mV at full load) and
internal feed-forward compensation for fast response to
step changes in load. An error output (ERROR) is asserted
when the TC1055 is 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
(withtheadditionofanexternalRCnetwork).Supplycurrent
is reduced to less than 1µA, and both VOUT and ERROR
are disabled when the shutdown input is low. The TC1055
incorporates both over-temperature and over-current pro-
tection.
■ Zero Ground Current for Longer Battery Life
■ Very Low Dropout Voltage
■ Guaranteed 100mA 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 SOT-23A-5 Package
■ Pin Compatible Upgrades for Bipolar Regulators
APPLICATIONS
■ Battery Operated Systems
■ Portable Computers
■ Medical Instruments
■ Instrumentation
■ Cellular/GSMS/PHS Phones
■ Linear Post-Regulators for SMPS
■ Pagers
The TC1055 is stable with an output capacitor of only
1µF and has a maximum output current of 100mA. For
higher output current regulators, please see the TC1107,
TC1108 (IOUT = 300mA) data sheets.
ORDERING INFORMATION
Output
Junction
Part No.
Voltage **(V) Package
Temp. Range
TYPICAL APPLICATION
TC1055-2.5VCT
TC1055-2.7VCT
TC1055-3.0VCT
TC1055-3.3VCT
TC1055-5.0VCT
2.5
2.7
3.0
3.3
5.0
SOT-23A-5* – 40°C to +125°C
SOT-23A-5* – 40°C to +125°C
SOT-23A-5* – 40°C to +125°C
SOT-23A-5* – 40°C to +125°C
SOT-23A-5* – 40°C to +125°C
1
5
V
V
V
OUT
V
IN
IN
OUT
1µF
NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A)
** Other output voltages available. Please contact TelCom
Semiconductor for details
2
3
GND
TC1055
1M
PIN CONFIGURATION
VOUT
5
ERROR
4
4
ERROR
SHDN
ERROR
TC1055
(SOT-23A-5*)
2
3
1
TOP VIEW
VIN
GND
SHDN
Shutdown Control
(from Power Control Logic)
NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A)
TC1055-01 6/5/97
TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices
1
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
