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TPS74901RGWT Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce TPS74901RGWT
Description  3.0A Low Dropout Linear Regulator with Programmable Soft-Start
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

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DROPOUT VOLTAGE
Reference
SimplifiedBlock Diagram
V
OUT
OUT
BIAS
FB
IN
V
IN
V
=3.3V 5%
BIAS
±
V
=3.3V
5V
V
=1.5V
I
=1.5A
Efficiency=45%
IN
OUT
OUT
±
C
OUT
PROGRAMMABLE SOFT-START
Reference
SimplifiedBlock Diagram
V
OUT
OUT
BIAS
FB
IN
V
=5V 5%
BIAS
±
V
=1.8V
V
=1.5V
I
=1.5A
Efficiency=83%
IN
OUT
OUT
C
OUT
t
=
SS
(V
xC
)
REF
SS
I
SS
(1)
t
=
SSCL
(V
xC
)
OUT(NOM)
OUT
I
CL(MIN)
(2)
TPS749xx
SBVS082A – JUNE 2007 – REVISED JULY 2007
The TPS749xx offers very low dropout performance,
making it well-suited for high-current low VIN/low
VOUT applications. The low dropout of the TPS749xx
allows the device to be used in place of a DC/DC
converter and still achieve good efficiencies. This
provides designers with the power architecture for
their applications to achieve the smallest, simplest,
and lowest cost solution.
There are two different specifications for dropout
voltage with the TPS749xx. The first specification
(see Figure 26) is referred to as VIN Dropout and is
used when an external bias voltage is applied to
achieve low dropout. This specification assumes that
VBIAS is at least 3.25V
(1) above V
OUT, which is the
Figure 27. Typical Application of the TPS749xx
case for VBIAS when powered by a 5.0V rail with 5%
Without an Auxiliary Bias
tolerance
and
with
VOUT = 1.5V. If VBIAS is
higher than VOUT + 3.25V, VIN dropout is less than
specified(1).
The TPS749xx features a programmable, monotonic,
voltage-controlled soft-start that is set with an
external capacitor (CSS). This feature is important for
many applications because it eliminates power-up
initialization problems when powering FPGAs, DSPs,
or other processors. The controlled voltage ramp of
the output also reduces peak inrush current during
start-up, minimizing start-up transient events to the
input power bus.
To achieve a linear and monotonic soft-start, the
TPS749xx error amplifier tracks the voltage ramp of
the external soft-start capacitor until the voltage
exceeds the internal reference. The soft-start ramp
time is dependent on the soft-start charging current
Figure 26. Typical Application of the TPS749xx
(ISS), soft-start capacitance (CSS), and the internal
Using an Auxiliary Bias Rail
reference voltage (VREF), and can be calculated
using Equation 1:
The second specification (shown in Figure 27) is
referred
to
as
VBIAS Dropout and applied to
applications where IN and BIAS are tied together.
This option allows the device to be used in
If large output capacitors are used, the device
applications where an auxiliary bias voltage is not
current limit (ICL) and the output capacitor may set
available or low dropout is not required. Dropout is
the start-up time. In this case, the start-up time is
limited by BIAS in these applications because VBIAS
given by Equation 2:
provides the gate drive to the pass FET; therefore,
VBIAS must be 3.25V
(1) above V
OUT.
where:
VOUT(NOM) is the nominal set output voltage,
COUT is the output capacitance, and
ICL(MIN) is the minimum current limit for the
device.
In applications where monotonic startup is required,
the soft-start time given by Equation 1 should be set
(1)
3.25V is a test condition of this device and can be adjusted by
to be greater than Equation 2.
referring to Figure 8.
11
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