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TC1185-2.7VCT713 Datasheet(PDF) 11 Page - Microchip Technology

No. de pieza TC1185-2.7VCT713
Descripción Electrónicos  50 mA, 100 mA and 150 mA CMOS LDOs with Shutdown and Reference Bypass
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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© 2007 Microchip Technology Inc.
DS21335E-page 11
TC1014/TC1015/TC1185
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
3.1
Input Voltage (VIN)
Connect the VIN pin to the unregulated source
voltage. Like all low dropout linear regulators, low
source impedance is necessary for the stable
operation of the LDO. The amount of capacitance
required to ensure low source impedance will
depend on the proximity of the input source
capacitors or battery type. For most applications,
1.0 µF of capacitance will ensure stable operation
of the LDO circuit. The type of capacitor used can
be ceramic, tantalum or aluminum electrolytic.
The low Effective Series Resistance (ESR) char-
acteristics of the ceramic will yield better noise
and Power Supply Ripple Rejection (PSRR)
performance at high frequency.
3.2
Ground Terminal (GND)
Connect the ground pin to the input voltage
return. For the optimal noise and PSRR
performance, the GND pin of the LDO should be
tied to a quiet circuit ground. For applications
have switching or noisy inputs tie the GND pin to
the return of the output capacitor. Ground planes
help lower inductance and voltage spikes caused
by fast transient load currents and are
recommended for applications that are subjected
to fast load transients.
3.3
Shutdown (SHDN)
The Shutdown input is used to turn the LDO on
and off. When the SHDN pin is at a logic high
level, the LDO output is enabled. When the
SHDN pin is pulled to a logic low, the LDO output
is disabled. When disabled, the quiescent current
used by the LDO is less than 0.5 µA max.
3.4
Bypass
Connecting a low-value ceramic capacitor to the
Bypass pin will further reduce output voltage
noise and improve the PSRR performance of the
LDO. While smaller and larger values can be
used, these affect the speed at which the LDO
output voltage rises when the input power is
applied. The larger the bypass capacitor, the
slower the output voltage will rise.
3.5
Output Voltage (VOUT)
Connect the output load to VOUT of the LDO. Also
connect one side of the LDO output capacitor as
close as possible to the VOUT pin.
Pin No.
(5-Pin SOT-23)
Symbol
Description
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
0.5 µA (maximum).
4
Bypass
Reference bypass input. Connecting a 470 pF to this input further reduces output
noise.
5VOUT
Regulated voltage output.


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