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TPS71913-28DRVT データシート(PDF) 11 Page - Texas Instruments

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部品番号 TPS71913-28DRVT
部品情報  Dual, 200mA Output, Low Noise, High PSRR Low-Dropout Linear Regulators
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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

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Transient Response
Undervoltage Lock-Out (UVLO)
Power Dissipation
Minimum Load
THERMAL INFORMATION
Thermal Protection
P =(V
V
)xI
-
D
IN
OUT
OUT
(1)
Package Mounting
TPS718xx
TPS719xx
www.ti.com..................................................................................................................................................... SBVS088C – FEBRUARY 2007 – REVISED MAY 2008
As with any linear regulator, PSRR and transient
Any tendency to activate the thermal protection circuit
response are degraded as (VIN – VOUT) approaches
indicates
excessive
power
dissipation
or
an
dropout. This effect is shown in Figure 13 and
inadequate heatsink. For reliable operation, junction
Figure 14 in the Typical Characteristics section.
temperature should be limited to +125
°C maximum.
To estimate the margin of safety in a complete design
(including
heatsink),
increase
the
ambient
temperature until the thermal protection is triggered;
As with any regulator, increasing the size of the
use worst-case loads and signal conditions. For good
output
capacitor
will
reduce
over/undershoot
reliability, thermal protection should trigger at least
magnitude but increase duration of the transient
+35
°C above the maximum expected ambient
response.
condition
of
your
particular
application.
This
configuration
produces
a
worst-case
junction
temperature of +125
°C at the highest expected
ambient temperature and worst-case load.
The TPS718xx/TPS719xx utilize an undervoltage
lock-out circuit to keep the output shut off until
The
internal
protection
circuitry
of
the
internal circuitry is operating properly. The UVLO
TPS718xx/TPS719xx has been designed to protect
circuit has a de-glitch feature so that it typically
against overload conditions. It was not intended to
ignores undershoot transients on the input if they are
replace proper heatsinking. Continuously running the
less than 50
µs duration. On the TPS719xx, the active
TPS718xx/TPS719xx
into
thermal
shutdown
pulldown discharges VOUT when the device is in
degrades device reliability.
UVLO off condition. However, the input voltage needs
to be greater than 0.8V for active pulldown to work.
The ability to remove heat from the die is different for
each
package
type,
presenting
different
The TPS718xx/TPS719xx are stable with no output
considerations in the printed circuit board (PCB)
load. Traditional PMOS LDO regulators suffer from
layout. The PCB area around the device that is free
lower loop gain at very light output loads. The
of other components moves the heat from the device
TPS718xx/TPS719xx
employ
an
innovative,
to the ambient air. Performance data for JEDEC low-
low-current mode circuit under very light or no-load
and high-K boards are given in the Dissipation
conditions, resulting in improved output voltage
Ratings table. Using heavier copper increases the
regulation performance down to zero output current.
effectiveness in removing heat from the device. The
addition of plated through-holes to heat-dissipating
layers also improves the heatsink effectiveness.
Power dissipation depends on input voltage and load
conditions. Power dissipation (PD) is equal to the
Thermal protection disables the output when the
product of the output current times the voltage drop
junction temperature rises to approximately +160
°C,
across the output pass element (VIN to VOUT), as
allowing the device to cool. When the junction
shown in Equation 1:
temperature cools to approximately +140
°C the
output circuitry is again enabled. Depending on power
dissipation,
thermal
resistance,
and
ambient
temperature, the thermal protection circuit may cycle
on and off. This cycling limits the dissipation of the
Solder
pad
footprint
recommendations
for
the
regulator,
protecting
it
from
damage
due
to
TPS718xx/TPS719xxx are available from the Texas
overheating.
Instruments web site at www.ti.com.
Copyright © 2007–2008, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Link(s): TPS718xx TPS719xx


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