參數(shù)資料
型號(hào)： TPS74812DRCR
廠商： Texas Instruments, Inc.
英文描述： 1.5A LDO Linear Regulator with Programmable Soft-Start
中文描述： 1.5A的LDO線性穩(wěn)壓器，具有可編程軟啟動(dòng)
文件頁(yè)數(shù)： 11/19頁(yè)
文件大?。?/td> 351K
代理商： TPS74812DRCR
www.ti.com
DROPOUT VOLTAGE
The TPS74801 offers very low dropout performance,
making it well-suited for high-current, low V
IN
/low
V
OUT
applications. The low dropout of the TPS74801
allows the device to be used in place of a DC/DC
converter and still achieve good efficiency. This
provides designers with the power architecture for
their application to achieve the smallest, simplest,
and lowest cost solution.
Reference
Simplified Block Diagram
V
OUT
OUT
BIAS
FB
IN
V
IN
V
V
V
I
Efficiency = 45%
= 3.3V 5%
= 3.3V
= 1.5V
= 1.5A
OUT
BIAS
±
5V
IN
OUT
±
C
OUT
PROGRAMMABLE SOFT-START
The TPS74801 features a programmable, monotonic,
voltage-controlled soft-start that is set with an
external capacitor (C
SS
). 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.
Reference
Simplified Block Diagram
V
OUT
OUT
BIAS
FB
IN
V
V
V
I
Efficiency = 83%
= 5V 5%
= 1.8V
= 1.5V
= 1.5A
OUT
BIAS
±
IN
OUT
C
OUT
t
=
SS
(V
C
)
′
REF
SS
I
SS
(1)
t
=
SSCL
(V
C
)
′
OUT(NOM)
OUT
I
CL(MIN)
(2)
TPS74801
SBVS074–JANUARY 2007
There are two different specifications for dropout
voltage with the TPS74801. The first specification
(shown in
Figure 26
) is referred to as
V
IN
Dropout
and is used when an external bias voltage is applied
to achieve low dropout. This specification assumes
that V
BIAS
is at least 1.56V above V
OUT
, which is the
case for V
BIAS
when powered by a 3.3V rail with 5%
tolerance and with V
= 1.5V. If V
is less than
V
OUT
+1.56V, V
IN
dropout is less than specified.
Figure 27. Typical Application of the TPS74801
Without an Auxiliary Bias Rail
To achieve a linear and monotonic soft-start, the
TPS74801 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 dependant on the soft-start charging current
(I
SS
), soft-start capacitance (C
SS
), and the internal
reference voltage (V
REF
), and can be calculated
using
Equation 1
:
Figure 26. Typical Application of the TPS74801
Using an Auxiliary Bias Rail
The second specification (shown in
Figure 27
) is
referred
to
as
V
BIAS
Dropout
applications where IN and BIAS are tied together.
This option allows the
applications where an auxiliary bias voltage is not
available or low dropout is not required. Dropout is
limited by BIAS in these applications because V
BIAS
provides the gate drive to the pass FET; therefore,
V
BIAS
must be 1.56V above V
OUT
.
and
applies
to
device
to
be
used
in
If large output capacitors are used, the device
current limit (I
CL
) and the output capacitor may set
the start-up time. In this case, the start-up time is
given by
Equation 2
:
where:
V
OUT(NOM)
is the nominal output voltage,
C
OUT
is the output capacitance, and
I
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
greater than
Equation 2
.
11
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