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부품번호 | TC1070 기능 |
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기능 | 50mA ADJUSTABLE CMOS LDO WITH SHUTDOWN | ||
제조업체 | TelCom Semiconductor | ||
로고 | |||
전체 12 페이지수
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.
PRELIMINARY INFORMATION
50mA ADJUSTABLE CMOS
LDO WITH SHUTDOWN
TC1070
DETAILED DESCRIPTION
The TC1070 is a precision fixed output voltage regula-
tor. (If a fixed version is desired, please see the TC1014 or
TC1015 data sheets.) Unlike the bipolar regulators, the
TC1070 supply current does not increase with load current.
In addition, VOUT remains stable and within regulation at
very low load currents (an important consideration in RTC
and CMOS RAM battery back-up applications).
Figure 1 shows a typical application circuit. The regula-
tor is enabled any time the shutdown input (SHDN) is at or
above VIH, and shutdown (disabled) when SHDN is at or
below VIL. SHDN may be controlled by a CMOS logic gate,
or I/O port of a microcontroller. If the SHDN input is not
required, it should be connected directly to the input supply.
While in shutdown, supply current decreases to 0.05µA
(typical) and VOUT falls to zero volts.
Output Capacitor
A 1µF (min) capacitor from VOUT to ground is recom-
mended. The output capacitor should have an effective
series resistance of 5Ω or less, and a resonant frequency
above 1MHz. A 1µF capacitor should be connected from VIN
to GND if there is more than 10 inches of wire between the
regulator and the AC filter capacitor, or if a battery is used as
the power source. Aluminum electrolytic or tantalum capaci-
tor types can be used. (Since many aluminum electrolytic
capacitors freeze at approximately – 30°C, solid tantalums
are recommended for applications operating below – 25°C.)
When operating from sources other than batteries, supply-
noise rejection and transient response can be improved by
increasing the value of the input and output capacitors and
employing passive filtering techniques.
Thermal Considerations
3.0V
BATTERY
1 VIN
C1
1µF
VOUT 5
C2
1µF
2
GND TC1070
+2.45V
R1
2.2M
3
SHDN
ADJ 4
Thermal Shutdown
Integrated thermal protection circuitry shuts the regula-
tor off when die temperature exceeds 160°C. The regulator
remains off until the die temperature drops to approximately
150°C.
Power Dissipation
The amount of power the regulator dissipates is prima-
rily a function of input and output voltage, and output current.
The following equation is used to calculate worst case
actual power dissipation:
Shutdown Control
(from Power Control Logic)
C3
100pF
0.01µF
(Optional)
R2
2.2M
Figure 1. 2.45 Battery-Operated Supply
Adjust Input
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
The output voltage setting is determined by the values
of R1 and R2 (Figure 1). The ohmic values of these resistors
should be between 470K and 3M to minimize bleeder
current.
The output voltage setting is calculated using the follow-
ing equation.
[ ]VOUT = VREF x
R1 + 1
R2
Equation 1.
The voltage adjustment range of the TC1070 is from
VREF to (VIN – 0.05V). If so desired, a small capacitor (100pF
to 0.01µF) may be added to the ADJ input to further reduce
output noise.
Equation 2.
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
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 3.
TC1070-01 6/13/97
4
4페이지 100mA ADJUSTABLE CMOS
LDO WITH SHUTDOWN
PRELIMINARY INFORMATION
TTCC1100771
100mA 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 100mA 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 TC1071 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!).
TC1071 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. Supply current is reduced to less than
1µA when the shutdown input is low. The TC1071 incorpo-
rates both over-temperature and over-current protection.
Output voltage is programmed with a simple resistor divider
from VOUT to ADJ.
The TC1071 is stable with an output capacitor of only
1µF and has a maximum output current of 100mA. For
higher output versions, please see the TC1174
(IOUT = 300mA) data sheet.
TYPICAL APPLICATION
VIN 1 VIN
VOUT 5
C1
1µF
ORDERING INFORMATION
Part No.
Output
Voltage **(V) Package
Junction
Temp. Range
VOUT
TC1071VCT 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
2 TC1071
GND
3
SHDN
ADJ 4
R1
R2
Shutdown Control
(from Power Control Logic)
[ ]VOUT = VREF x R2 + 1
R1
PIN CONFIGURATION
VOUT
5
ADJ
4
TC1071
(SOT-23A-5*)
12 3
TOP VIEW
VIN GND SHDN
NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A)
TC1071-01 6/13/97 TelCom Semiconductor reserves the right to make changes in the circuitry1and specifications ot its devices.
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부품번호 | 상세설명 및 기능 | 제조사 |
TC1070 | CMOS LDOs | Microchip Technology |
TC1070 | 50mA ADJUSTABLE CMOS LDO WITH SHUTDOWN | TelCom Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |