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TPS799L57YZYR Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce TPS799L57YZYR
Description  200-mA, Low-Dropout Linear Regulator
Download  14 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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TPS799L
www.ti.com
SBVS191 – APRIL 2012
DROPOUT VOLTAGE
TRANSIENT RESPONSE
The TPS799Lxx uses a PMOS pass transistor to
As with any regulator, increasing the size of the
achieve a low dropout voltage. When (VIN – VOUT) is
output capacitor reduces over/undershoot magnitude,
less than the dropout voltage (VDO), the PMOS pass
but increases the duration of the transient response.
device is in its linear region of operation and rDS(on) of
The
transient
response
of
the
TPS799Lxx
is
the PMOS pass element is the input-to-output
enhanced by an active pull-down device that engages
resistance. Because the PMOS device behaves like a
when the output overshoots by approximately 5% or
resistor in dropout, VDO approximately scales with the
more when the device is enabled. When enabled, the
output current.
pull-down device behaves like a 350-
Ω resistor to
ground.
As with any linear regulator, PSRR degrades as
(VIN – VOUT) approaches dropout. This effect is shown
UNDERVOLTAGE LOCKOUT (UVLO)
in Figure 9 through Figure 14 in the Typical
Characteristics section.
The TPS799Lxx uses an undervoltage lockout circuit
to keep the output shut off until internal circuitry is
START-UP
operating properly. The UVLO circuit has a deglitch
feature
so
that
it
typically
ignores
undershoot
The TPS799Lxx uses a start-up circuit to quickly
transients on the input if they are less than 50
μs in
charge the noise reduction capacitor, CNR, if present
duration.
(see Functional Block Diagrams, Figure 1). This
circuit allows for the combination of very low output
MINIMUM LOAD
noise and fast start-up times. The NR pin is high
impedance so a low leakage CNR capacitor must be
The TPS799Lxx is stable with no output load. To
used; most ceramic capacitors are appropriate for this
meet the specified accuracy, a minimum load of 500
configuration.
μA is required. With loads less than 500 μA at
junction temperatures near +125°C, the output can
Note that for fastest start-up, apply VIN first, and then
drift up enough to cause the output pull-down device
drive the enable pin (EN) high. If EN is tied to IN,
to turn on. The output pull-down device limits voltage
start-up is somewhat slower. The start-up switch is
drift to 5% typically; however, ground current can
closed for approximately 135
μs. To ensure that CNR
increase
by
approximately
50
μA.
In
typical
is fully charged during start-up, use a 0.01-
μF or
applications,
the
junction
cannot
reach
high
smaller capacitor.
temperatures at light loads because there is no
noticeable dissipated power. The specified ground
current is then valid at no load in most applications.
Copyright © 2012, Texas Instruments Incorporated
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