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TL1963A-25KTTR Scheda tecnica(PDF) 4 Page - Texas Instruments

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Il numero della parte TL1963A-25KTTR
Spiegazioni elettronici  1.5-A Low-Noise Fast-Transient-Response Low-Dropout Regulator
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TL1963A-25KTTR Scheda tecnica(HTML) 4 Page - Texas Instruments

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TL1963A, TL1963A-15, TL1963A-18, TL1963A-25, TL1963A-33
SLVS719G – JUNE 2008 – REVISED JANUARY 2015
www.ti.com
Pin Functions
PIN
I/O
DESCRIPTION
NAME
DCQ
DCY
KTT
Adjust. For the adjustable TL1963A, this is the input to the error amplifier. This pin is clamped
ADJ
5
5
I
internally to ±7 V. It has a bias current of 3
μA that flows into the pin. The ADJ pin voltage is
1.21 V referenced to ground, and the output voltage range is 1.21 V to 20 V.
GND
3, 6
2, 4
3
Ground
Input. Power is supplied to the device through the IN pin. A bypass capacitor is required on
this pin if the device is more than six inches away from the main input filter capacitor. In
general, the output impedance of a battery rises with frequency, so it is advisable to include a
bypass capacitor in battery-powered circuits. A bypass capacitor (ceramic) in the range of
IN
2
1
2
I
1
μF to 10 μF is sufficient. The TL1963A-xx regulators are designed to withstand reverse
voltages on the IN pin with respect to ground and the OUT pin. In the case of a reverse input,
which can happen if a battery is plugged in backwards, the device acts as if there is a diode in
series with its input. There is no reverse-current flow into the regulator, and no reverse
voltage appears at the load. The device protects both itself and the load.
Output. The output supplies power to the load. A minimum output capacitor (ceramic) of
OUT
4
3
4
O
10
μF is required to prevent oscillations. Larger output capacitors are required for applications
with large transient loads to limit peak voltage transients.
Sense. For fixed voltage versions of the TL1963A-xx (TL1963A-1.5, TL1963A-1.8, TL1963A-
2.5, and TL1963A-3.3), the SENSE pin is the input to the error amplifier. Optimum regulation
is obtained at the point where the SENSE pin is connected to the OUT pin of the regulator. In
critical applications, small voltage drops are caused by the resistance (RP) of PC traces
between the regulator and the load. These may be eliminated by connecting the SENSE pin
SENSE
5
5
I
to the output at the load as shown in Figure 32. Note that the voltage drop across the external
PCB traces adds to the dropout voltage of the regulator. The SENSE pin bias current is 600
μA at the rated output voltage. The SENSE pin can be pulled below ground (as in a dual
supply system in which the regulator load is returned to a negative supply) and still allow the
device to start and operate.
Shutdown. The SHDN pin is used to put the TL1963A-xx regulators into a low-power
shutdown state. The output is off when the SHDN pin is pulled low. The SHDN pin can be
driven either by 5-V logic or open-collector logic with a pullup resistor. The pullup resistor is
SHDN
1
1
I
required to supply the pullup current of the open-collector gate, normally several
microamperes, and the SHDN pin current, typically 3
μA. If unused, the SHDN pin must be
connected to VIN. The device is in the low-power shutdown state if the SHDN pin is not
connected.
Thermal
For the KTT package, the exposed thermal pad is connected to ground and must be soldered
Pad
to the PCB for rated thermal performance.
4
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Product Folder Links: TL1963A TL1963A-15 TL1963A-18 TL1963A-25 TL1963A-33


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