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TPS74201KTWR Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS74201KTWR
Description  1.5A Ultra-LDO with Programmable Soft-Start
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS74201KTWR Datasheet(HTML) 11 Page - 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
±
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
t
SS
+
V
REF
C
SS
I
SS
(1)
t
SSCL
+
V
OUT(NOM)
C
OUT
I
CL(MIN)
(2)
TPS74201
SBVS064F – DECEMBER 2005 – REVISED OCTOBER 2007
The
TPS74201
offers
industry-leading
dropout
performance, making it well-suited for high-current
low VIN/low VOUT applications. The extremely low
dropout of the TPS74201 allows the device to be
used in place of a DC/DC converter and still achieve
good efficiencies. This efficiency allows the user to
rethink 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 TPS74201. The first specification
(see Figure 27) is referred to as VIN Dropout and is
for users who wish to apply an external bias voltage
to achieve low dropout. This specification assumes
Figure 28. Typical Application of the TPS74201
that VBIAS is at least 1.62V above VOUT, which is the
Without an Auxiliary Bias
case for VBIAS when powered by a 3.3V rail with 5%
tolerance and with VOUT = 1.5V. If VBIAS is higher than
3.3V
× 0.95 or V
OUT is less than 1.5V, VIN dropout is
less than specified.
The TPS74201 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 transients to the input
power bus.
To achieve a linear and monotonic soft-start, the
TPS74201 error amplifier tracks the voltage ramp of
the external soft-start capacitor until the voltage
exceeds the internal reference. The soft-start ramp
time depends on the soft-start charging current (ISS),
soft-start
capacitance
(CSS),
and
the
internal
Figure 27. Typical Application of the TPS74201
reference voltage (VREF), and can be calculated using
Using an Auxiliary Bias Rail
Equation 1:
The second specification (see Figure 28) is referred
to as VBIAS Dropout and is for users who wish to tie
IN and BIAS together. This option allows the device
If large output capacitors are used, the device current
to be used in applications where an auxiliary bias
limit (ICL) and the output capacitor may set the
voltage is not available or low dropout is not required.
start-up time. In this case, the start-up time is given
Dropout is limited by BIAS in these applications
by Equation 2:
because VBIAS provides the gate drive to the pass
FET and therefore must be 1.4V above VOUT.
Because of this usage, IN and BIAS tied together
easily consume huge power. Pay attention not to
exceed the power rating of the IC package.
VOUT(NOM) is the nominal set output voltage as set by
the user, 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 to
be greater than Equation 2.
Copyright © 2005–2007, Texas Instruments Incorporated
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