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PDF TC1072 Data sheet ( Hoja de datos )
| Número de pieza | TC1072 | |
| Descripción | 50mA CMOS LDO WITH SHUTDOWN / ERROR OUTPUT AND VREF BYPASS | |
| Fabricantes | TelCom Semiconductor | |
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50mA CMOS LDO WITH SHUTDOWN,
ERROR OUTPUT AND VREF BYPASS
PRELIMINARY INFORMATION
TTCC1100772
50mA CMOS LDO WITH SHUTDOWN, ERROR OUTPUT AND VREF BYPASS
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 Ouput can be Used as a Low Battery
Detector, or Processor Reset Generator
s Bypass Input for Ultra-quiet Operation
s Over-Current and Over-Temperature Protection
s Space-Saving SOT-23A-6 Package
s Pin Compatible Upgrades for Bipolar Regulators
APPLICATIONS
s Battery Operated Systems
s Portable Computers
s Medical Instruments
s Instrumentation
s Cellular / GSM / PHS Phones
s Linear Post-Regulator for SMPS
s Pagers
GENERAL DESCRIPTION
The TC1072 is a high accuracy (typically ±0.5%) CMOS
upgrade for older (bipolar) low dropout regulators. Designed
specifically for battery-operated systems, the TC1072’s
TYPICAL APPLICATION
1M
VIN 1 VIN
VOUT 6
VOUT
1µF
CMOS construction eliminates wasted ground current, sig-
nificantly extending battery life. Total supply current is
typically 50µA at full load (20 to 60 times lower than in bipolar
regulators!).
TC1072 key features include ultra low noise operation
(plus optional Bypass input); very low dropout voltage (typi-
cally 100mV at full load) and internal feed-forward compen-
sation for fast response to step changes in load. An error
output (ERROR) is asserted when the TC1072 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 TC1072 incorporates both over-tempera-
ture and over-current protection.
The TC1072 is stable with an output capacitor of only
1µF and has a maximum output current of 50mA. For higher
output current versions, please see the TC1107, TC1108
and TC1073 (IOUT = 300mA) data sheets.
ORDERING INFORMATION
Part No.
Output
Voltage **(V) Package
Junction
Temp. Range
TC1072-2.5VCH 2.5
SOT-23A-6* – 40°C to +125°C
TC1072-2.7VCH 2.7
SOT-23A-6* – 40°C to +125°C
TC1072-3.0VCH 3.0
SOT-23A-6* – 40°C to +125°C
TC1072-3.3VCH 3.3
SOT-23A-6* – 40°C to +125°C
TC1072-5.0VCH 5.0
SOT-23A-6* – 40°C to +125°C
NOTE: *SOT-23A-6 is equivalent to the EIAJ (SC-74A)
** Other output voltages available. Please contact TelCom
Semiconductor for details
PIN CONFIGURATION
2 TC1072
5
GND
Bypass
3
SHDN
4
ERROR
CBYPASS
470pF
ERROR
VOUT Bypass ERROR
654
TC1072
(SOT-23A-6*)
Shutdown Control
(from Power Control Logic)
12 3
VIN GND SHDN
TOP VIEW
NOTE: *SOT-23A-6 is equivalent to the EIAJ (SC-74A)
TC1072-01 6/16/97
TelCom Semiconductor reserves the right to make changes in the circuit1ry and specifications ot its devices.
1 page  
50mA CMOS LDO WITH SHUTDOWN,
ERROR OUTPUT AND VREF BYPASS
PRELIMINARY INFORMATION
TC1072
The following equation is used to calculate worst case
actual power dissipation:
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-6
packag has a θJA of approximately 220°C/Watt when
mounted on a single layer FR4 dielectric copper clad PC
board.
PD MAX = (TJMAX – TAMAX)
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 ±10%
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 TC1072 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.
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.
TC1072-01 6/16/97
5
5 Page 
100mA CMOS LDO WITH SHUTDOWN,
ERROR OUTPUT AND VREF BYPASS
PRELIMINARY INFORMATION
TC1073
The following equation is used to calculate worst case
actual power dissipation:
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-6
packag 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 ±10%
VOUTMIN = 2.7V ±0.5V
ILOAD = 98mA
TAMAX = 55°C
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
PD ≈ (VINMAX – VOUTMIN)ILOADMAX
= [(3.0 x 1.1) – (2.7 x .995)]40 x 10–3
= 60mW
Maximum allowable power dissipation:
PDMAX = (TJMAX – TAMAX)
θJA
= (125 – 55)
220
= 318mW
In this example, the TC1073 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 sustituting
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.
TC1073-01 6/5/97
5
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TC1072.PDF ] | |
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