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TL1963A-Q1 データシート(PDF) 14 Page - Texas Instruments

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部品番号 TL1963A-Q1
部品情報  1.5-A Low-Noise Fast-Transient-Response Low-Dropout Regulator
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

TL1963A-Q1 データシート(HTML) 14 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
Feature Description (continued)
The problem occurs with a heavy output load when the input voltage is high and the output voltage is low.
Common situations occur immediately after the removal of a short circuit or when the shutdown pin is pulled high
after the input voltage has already been turned on. The load line for such a load may intersect the output current
curve at two points. If this happens, there are two stable output operating points for the regulator. With this
double intersection, the input power supply may need to be cycled down to zero and brought up again to make
the output recover.
9.3.2 Output Voltage Noise
The TL1963A-xx regulators have been designed to provide low output voltage noise over the 10-Hz to 100-kHz
bandwidth while operating at full load. Output voltage noise is typically 35 nV/
√Hz over this frequency bandwidth
for the TL1963A (adjustable version). For higher output voltages (generated by using a resistor divider), the
output voltage noise is gained up accordingly. This results in RMS noise over the 10-Hz to 100-kHz bandwidth of
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μVRMS for the TL1963A, increasing to 38 μVRMS for the TL1963A-33.
Higher values of output voltage noise may be measured when care is not exercised with regard to circuit layout
and testing. Crosstalk from nearby traces can induce unwanted noise onto the output of the TL1963A-xx. Power-
supply ripple rejection must also be considered; the TL1963A-xx regulators do not have unlimited power-supply
rejection and pass a small portion of the input noise through to the output.
9.3.3 Protection Features
The TL1963A-xx regulators incorporate several protection features which make them ideal for use in battery-
powered circuits. In addition to the normal protection features associated with monolithic regulators, such as
current limiting and thermal limiting, the devices are protected against reverse input voltages, reverse output
voltages and reverse voltages from output to input.
Current limit protection and thermal overload protection are intended to protect the device against current
overload conditions at the output of the device. For normal operation, the junction temperature should not exceed
125°C.
The input of the device withstands reverse voltages of 20 V. Current flow into the device is limited to less than
1 mA (typically less than 100
μA), and no negative voltage appears at the output. The device protects both itself
and the load. This provides protection against batteries that can be plugged in backward.
The output of the TL1963A-xx can be pulled below ground without damaging the device. If the input is left open
circuit or grounded, the output can be pulled below ground by 20 V. For fixed voltage versions, the output acts
like a large resistor, typically 5 k
Ω or higher, limiting current flow to typically less than 600 μA. For adjustable
versions, the output acts like an open circuit; no current flows out of the pin. If the input is powered by a voltage
source, the output sources the short-circuit current of the device and protects itself by thermal limiting. In this
case, grounding the SHDN pin turns off the device and stops the output from sourcing the short-circuit current.
The ADJ pin of the adjustable device can be pulled above or below ground by as much as 7 V without damaging
the device. If the input is left open circuit or grounded, the ADJ pin acts like an open circuit when pulled below
ground and like a large resistor (typically 5 k
Ω) in series with a diode when pulled above ground.
In situations where the ADJ pin is connected to a resistor divider that would pull the ADJ pin above its 7-V clamp
voltage if the output is pulled high, the ADJ pin input current must be limited to less than 5 mA. For example, a
resistor divider is used to provide a regulated 1.5-V output from the 1.21-V reference when the output is forced to
20 V. The top resistor of the resistor divider must be chosen to limit the current into the ADJ pin to less than
5 mA when the ADJ pin is at 7 V. The 13-V difference between OUT and ADJ divided by the 5-mA maximum
current into the ADJ pin yields a minimum top resistor value of 2.6 k
Ω.
In circuits where a backup battery is required, several different input/output conditions can occur. The output
voltage may be held up while the input is either pulled to ground, pulled to some intermediate voltage, or is left
open circuit.
When the IN pin of the TL1963A-xx is forced below the OUT pin or the OUT pin is pulled above the IN pin, input
current typically drops to less than 2
μA. This can happen if the input of the device is connected to a discharged
(low voltage) battery and the output is held up by either a backup battery or a second regulator circuit. The state
of the SHDN pin has no effect on the reverse output current when the output is pulled above the input.
14
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Product Folder Links: TL1963A TL1963A-15 TL1963A-18 TL1963A-25 TL1963A-33


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