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TC1070VCT Datasheet(PDF) 4 Page - TelCom Semiconductor, Inc

No. de pieza TC1070VCT
Descripción Electrónicos  50mA ADJUSTABLE CMOS LDO WITH SHUTDOWN
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Fabricante Electrónico  TELCOM [TelCom Semiconductor, Inc]
Página de inicio  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC1070VCT Datasheet(HTML) 4 Page - TelCom Semiconductor, Inc

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TC1070
4
50mA ADJUSTABLE CMOS
LDO WITH SHUTDOWN
PRELIMINARY INFORMATION
TC1070-01
6/13/97
Output Capacitor
A 1
µF (min) capacitor from VOUT to ground is recom-
mended. The output capacitor should have an effective
series resistance of 5
Ω or less, and a resonant frequency
above 1MHz. A 1
µF 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
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:
PD ≈ (VINMAX – VOUTMIN)ILOADMAX
Where:
PD = Worst case actual power dissipation
VIN
MAX = Maximum voltage on VIN
VOUT
MIN = Minimum regulator output voltage
ILOAD
MAX = Maximum output (load) current
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.
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 0.05
µA
(typical) and VOUT falls to zero volts.
Adjust Input
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 0.01
µF) may be added to the ADJ input to further reduce
output noise.
Figure 1. 2.45 Battery-Operated Supply
C2
1
µF
C3
100pF
0.01
µF
(Optional)
Shutdown Control
(from Power Control Logic)
TC1070
VIN
1
2
3
4
R2
2.2M
R1
2.2M
+2.45V
5
VOUT
ADJ
SHDN
GND
3.0V
BATTERY
C1
1
µF


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