50mA CMOS LDO WITH SHUTDOWN
AND ERROR OUTPUT
PRELIMINARY INFORMATION
TC1054
TC1054
50mA CMOS LDO WITH SHUTDOWN AND ERROR OUTPUT
FEATURES
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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
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
GENERAL DESCRIPTION
The TC1054 is a high accuracy (typically
±0.5%)
CMOS
upgrade for older (bipolar) low dropout regulators. De-
signed specifically for battery-operated systems, the
TC1054’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!).
TC1054 key features include ultra low noise operation,
very low dropout voltage (typically 100mV at full load) and
internal feed-forward compensation for fast response to
step changes in load. An error output (ERROR) is asserted
when the TC1054 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
(with the addition of an external RC network). Supply current
is reduced to less than 1µA, and both V
OUT
and ERROR
are disabled when the shutdown input is low. The TC1054
incorporates both over-temperature and over-current pro-
tection.
The TC1054 is stable with an output capacitor of only
1µF and has a maximum output current of 50mA. For higher
output current regulators, please see the TC1055
(I
OUT
= 100mA) regulator and TC1107, TC1108 (I
OUT
=
300mA) data sheets.
TYPICAL APPLICATION
APPLICATIONS
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Battery Operated Systems
Portable Computers
Medical Instruments
Instrumentation
Cellular/GSMS/PHS Phones
Linear Post-Regulators for SMPS
Pagers
ORDERING INFORMATION
Part No.
Output
Voltage **(V) Package
2.5
2.7
3.0
3.3
5.0
Junction
Temp. Range
TC1054-2.5VCT
TC1054-2.7VCT
TC1054-3.0VCT
TC1054-3.3VCT
TC1054-5.0VCT
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
V
IN
1
V
IN
V
OUT
5
1µF
V
OUT
NOTE:
*SOT-23A-5 is equivalent to the EIAJ (SC-74A)
** Other output voltages available. Please contact TelCom
Semiconductor for details
2
GND
TC1054
1M
PIN CONFIGURATION
V
OUT
5
ERROR
3
4
SHDN
ERROR
4
ERROR
TC1054
(SOT-23A-5*)
1
2
3
TOP VIEW
Shutdown Control
(from Power Control Logic)
V
IN
GND SHDN
NOTE:
*SOT-23A-5 is equivalent to the EIAJ (SC-74A)
TC1054-01 6/12/97
TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices
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TELCOM [ TELCOM SEMICONDUCTOR, INC ]
