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TC1014 Datasheet(PDF) 3 Page - TelCom Semiconductor, Inc

Part No. TC1014
Description  50mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS
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Maker  TELCOM [TelCom Semiconductor, Inc]
Homepage  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC1014 Datasheet(HTML) 3 Page - TelCom Semiconductor, Inc

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TC1014
3
PRELIMINARY INFORMATION
TC1014-01-6/5/97
50mA CMOS LDO WITH SHUTDOWN
AND REFERENCE BYPASS
Pin No.
1VIN
Unregulated supply input.
2
GND
Ground terminal.
3
SHDN
Shutdown control input. The regulator is fully enabled when a logic high is applied to this
input. The regulator enters shutdown when a logic low is applied to this input. During
shutdown, output voltage falls to zero, and supply current is reduced to under 1 microamp
(typical).
4
Bypass
Reference bypass input. Connecting a 470pF to this input further reduces output noise.
5VOUT
Regulated voltage output.
PIN DESCRIPTION
(SOT-23A-5)
Symbol
Description
DETAILED DESCRIPTION
The TC1014 is a precision fixed output voltage regula-
tor. (If an adjustable version is desired, please see the
TC1070 or TC1071 data sheets.) Unlike the bipolar regula-
tors, the TC1014 supply current does not increase with load
current. In addition, VOUT remains stable and within regula-
tion 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.
Bypass Input
A 470pF capacitor connected from the Bypass input to
ground reduces noise present on the internal reference,
which in turn significantly reduces output noise. If output
noise is not a concern, this input may be left unconnected.
Larger capacitor values may be used, but results in a longer
time period to rated output voltage when power is initially
applied.
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:
Figure 1. Typical Application Circuit
1
µF
470pF
Reference
Bypass Cap
(Optional)
Shutdown Control
(to CMOS Logic or Tie to V
IN if Unused)
TC1014
VIN
BATTERY
VOUT
Bypass
SHDN
GND
VOUT
1
µF


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