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PDF TC1054 Data sheet ( Hoja de datos )
| Número de pieza | TC1054 | |
| Descripción | 50mA CMOS LDO WITH SHUTDOWN AND ERROR OUTPUT | |
| Fabricantes | TelCom Semiconductor | |
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50mA CMOS LDO WITH SHUTDOWN
AND ERROR OUTPUT
PRELIMINARY INFORMATION
50mA CMOS LDO WITH SHUTDOWN AND ERROR OUTPUT
TTCC1100554
FEATURES
s Zero Ground Current for Longer Battery Life
s Very Low Dropout Voltage
s Guaranteed 50mA Output
s High Output Voltage Accuracy
s Standard or Custom Output Voltages
s Power-Saving Shutdown Mode
s ERROR Output can be Used as a Low Battery
Detector, or Processor Reset Generator
s Over-Current and Over-Temperature Protection
s Space-Saving SOT-23A-5 Package
s Pin Compatible Upgrades for Bipolar Regulators
APPLICATIONS
s Battery Operated Systems
s Portable Computers
s Medical Instruments
s Instrumentation
s Cellular/GSMS/PHS Phones
s Linear Post-Regulators for SMPS
s Pagers
ORDERING INFORMATION
Part No.
Output
Voltage **(V) Package
Junction
Temp. Range
TC1054-2.5VCT 2.5
SOT-23A-5* – 40°C to +125°C
TC1054-2.7VCT 2.7
SOT-23A-5* – 40°C to +125°C
TC1054-3.0VCT 3.0
SOT-23A-5* – 40°C to +125°C
TC1054-3.3VCT 3.3
SOT-23A-5* – 40°C to +125°C
TC1054-5.0VCT 5.0
SOT-23A-5* – 40°C to +125°C
NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A)
** Other output voltages available. Please contact TelCom
Semiconductor for details
PIN CONFIGURATION
VOUT
5
ERROR
4
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 VOUT 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
(IOUT = 100mA) regulator and TC1107, TC1108 (IOUT =
300mA) data sheets.
TYPICAL APPLICATION
VIN 1 VIN
VOUT 5
VOUT
1µF
2
GND
TC1054
1M
3
SHDN
4
ERROR
ERROR
TC1054
(SOT-23A-5*)
12 3
TOP VIEW
VIN GND SHDN
NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A)
Shutdown Control
(from Power Control Logic)
TC1054-01 6/12/97 TelCom Semiconductor reserves the right to make changes in the circuitry1and specifications of its devices
1 page  
50mA CMOS LDO WITH SHUTDOWN
AND ERROR OUTPUT
PRELIMINARY INFORMATION
TC1054
PD ≈ (VINMAX – VOUTMIN)ILOADMAX
Where:
PD = Worst case actual power dissipation
VINMAX = Maximum voltage on VIN
VOUTMIN = Minimum regulator output voltage
ILOADMAX = Maximum output (load) current
Equation 1.
The maximum allowable power dissipation (Equation 2)
is a function of the maximum ambient temperature (TAMAX),
the maximum allowable die temperature (125°C) and the
thermal resistance from junction-to-air (θJA). SOT-23A-5
package has a θJA of approximately 220°C/Watt when
mounted on a single layer FR4 dielectric copper clad PC
board.
PD MAX = (TJMAX – TJMAX)
θJA
Where all terms are previously defined.
Equation 2.
Equation 1 can be used in conjunction with Equation 2
to ensure regulator thermal operation is within limits. For
example:
Given:
VINMAX = 3.0V ±5%
VOUTMIN = 2.7V ±0.5V
ILOAD = 40mA
TAMAX = 55°C
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
PD ≈ (VINMAX – VOUTMIN)ILOADMAX
= [(3.0 x 1.05) – (2.7 x .995)]40 x 10–3
= 18.5mW
Maximum allowable power dissipation:
PDMAX = (TJMAX – TAMAX)
θJA
= (125 – 55)
220
= 318mW
In this example, the TC1054 dissipates a maximum of
only 18.5mW; far below the allowable limit of 318mW. In a
similar manner, Equation 1 and Equation 2 can be used to
calculate maximum current and/or input voltage limits.
Layout Considerations
The primary path of heat conduction out of the package
is via the package leads. Therefore, layouts having a
ground plane, wide traces at the pads, and wide power
supply bus lines combine to lower θJA and therefore in-
crease the maximum allowable power dissipation limit.
TC1054-01 6/12/97
5
5 Page 
100mA CMOS LDO WITH SHUTDOWN
AND ERROR OUTPUT
PRELIMINARY INFORMATION
TC1055
PD ≈ (VINMAX – VOUTMIN)ILOADMAX
Where:
PD = Worst case actual power dissipation
VINMAX = Maximum voltage on VIN
VOUTMIN = Minimum regulator output voltage
ILOADMAX = Maximum output (load) current
Equation 1.
The maximum allowable power dissipation (Equation 2)
is a function of the maximum ambient temperature (TAMAX),
the maximum allowable die temperature (125°C) and the
thermal resistance from junction-to-air (θJA). SOT-23A-5
package has a θJA of approximately 220°C/Watt when
mounted on a single layer FR4 dielectric copper clad PC
board.
PD MAX = (TJMAX – TJMAX)
θJA
Where all terms are previously defined.
Equation 2.
Equation 1 can be used in conjunction with Equation 2
to ensure regulator thermal operation is within limits. For
example:
Given:
VINMAX = 3.0V ±5%
VOUTMIN = 2.7V ±0.5V
ILOAD = 40mA
TAMAX = 55°C
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
PD ≈ (VINMAX – VOUTMIN)ILOADMAX
= [(3.0 x 1.05) – (2.7 x .995)]40 x 10–3
= 18.5mW
Maximum allowable power dissipation:
PDMAX = (TJMAX – TAMAX)
θJA
= (125 – 55)
220
= 318mW
In this example, the TC1055 dissipates a maximum of
only 60mW; far below the allowable limit of 318mW. In a
similar manner, Equation 1 and Equation 2 can be used to
calculate maximum current and/or input voltage limits. For
example, the maximum allowable VIN is found by substitut-
ing the maximum allowable power dissipation of 318mW
into Equation 1, from which VINMAX = 5.9V.
Layout Considerations
The primary path of heat conduction out of the package
is via the package leads. Therefore, layouts having a
ground plane, wide traces at the pads, and wide power
supply bus lines combine to lower θJA and therefore in-
crease the maximum allowable power dissipation limit.
TC1055-01 6/5/97
5
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TC1054.PDF ] | |
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