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PDF TC1070 Data sheet ( Hoja de datos )
| Número de pieza | TC1070 | |
| Descripción | 50mA ADJUSTABLE CMOS LDO WITH SHUTDOWN | |
| Fabricantes | TelCom Semiconductor | |
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50mA ADJUSTABLE CMOS
LDO WITH SHUTDOWN
PRELIMINARY INFORMATION
TTCC1100770
50mA ADJUSTABLE CMOS LDO WITH SHUTDOWN
FEATURES
s Zero Ground Current for Longer Battery Life!
s Adjustable Output Voltage
s Very Low Dropout Voltage
s Guaranteed 50mA Output
s Power-Saving Shutdown Mode
s Over-Current and Over-Temperature Protection
s Space-Saving SOT-23A-5 Package
s Pin Compatible with LP2980 and MIC5205 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 TC1070 is an adjustable LDO designed to super-
cede a variety of older (bipolar) voltage regulators. De-
signed specifically for battery-operated systems, the
TC1070’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!).
TC1070 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. Supply current is reduced to less than
1µA when the shutdown input is low. The TC1070 incorpo-
rates both over-temperature and over-current protection.
Output voltage is programmed with a simple resistor divider
from VOUT to ADJ.
The TC1070 is stable with an output capacitor of only
1µF and has a maximum output current of 50mA. For higher
output versions, please see the TC1107, TC1108
(IOUT = 300mA) data sheets.
TYPICAL APPLICATION
VIN 1 VIN
VOUT 5
C1
1µF
VOUT
2 TC1070
GND
R1
3
SHDN
ADJ 4
R2
Shutdown Control
(from Power Control Logic)
[ ]VOUT = VREF x R2 + 1
R1
ORDERING INFORMATION
Part No.
Output
Voltage **(V) Package
Junction
Temp. Range
TC1070VCT Adjustable 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
ADJ
4
TC1070
(SOT-23A-5*)
12 3
VIN GND SHDN
TOP VIEW
NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A)
TC1070-01 6/13/97 TelCom Semiconductor reserves the right to make changes in the circuitry1and specifications ot its devices.
1 page  
50mA ADJUSTABLE CMOS
LDO WITH SHUTDOWN
Equation 2 can be used in conjunction with Equation 3
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 TC1070 dissipates a maximum of
only 60mW; far below the allowable limit of 318mW. In a
similar manner, Equation 2 and Equation 3 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 increase the
maximum allowable power dissipation limit.
PRELIMINARY INFORMATION
TC1070
TC1070-01 6/13/97
5
5 Page 
100mA ADJUSTABLE CMOS
LDO WITH SHUTDOWN
Equation 2 can be used in conjunction with Equation 3
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 TC1071 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 increase the
maximum allowable power dissipation limit.
PRELIMINARY INFORMATION
TC1071
TC1071-01 6/13/97
5
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TC1070.PDF ] | |
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