參數(shù)資料
型號(hào)： TPS736XX_08
廠商： Texas Instruments, Inc.
英文描述： Cap-Free, NMOS, 400mA Low-Dropout Regulator with Reverse Current Protection
中文描述： 無(wú)電容，NMOS管，400mA的低壓差穩(wěn)壓器的反向電流保護(hù)
文件頁(yè)數(shù)： 12/26頁(yè)
文件大?。?/td> 873K
代理商： TPS736XX_08
www.ti.com
Shutdown
The Enable pin is active high and is compatible with
standard TTL-CMOS levels. V
EN
below 0.5V (max)
turns the regulator off and drops the ground pin
current to approximately 10nA. When shutdown
capability is not required, the Enable pin can be
connected to V
IN
. When a pull-up resistor is used,
and operation down to 1.8V is required, use pull-up
resistor values below 50k
. To ensure all charge is
removed from the gate of the pass element, the
Enable pin must be driven low before the input
voltage is removed. If the Enable pin is not driven
low, the pass element may be left on because of
stored charge on the gate.
V
N
( V
RMS
)
8.5
V
RMS
V
V
OUT
(V)
(3)
Dropout Voltage
The TPS736xx uses an NMOS pass transistor to
achieve extremely low dropout. When (V
IN
– V
OUT
) is
less than the dropout voltage (V
DO
), the NMOS pass
device is in its linear region of operation and the
input-to-output resistance is the R
DS-ON
of the NMOS
pass element.
Board Layout Recommendation to Improve
PSRR and Noise Performance
To improve ac performance such as PSRR, output
noise, and transient response, it is recommended that
the board be designed with separate ground planes
for V
IN
and V
OUT
, with each ground plane connected
only at the GND pin of the device. In addition, the
ground connection for the bypass capacitor should
connect directly to the GND pin of the device.
Internal Current Limit
The TPS736xx internal current limit helps protect the
regulator during fault conditions. Foldback current
limit helps to protect the regulator from damage
during output short-circuit conditions by reducing
current limit when V
OUT
drops below 0.5V. See
Figure 12
in the
Typical Characteristics
section.
Transient Response
The low open-loop output impedance provided by the
NMOS
pass
element
configuration allows operation without an output
capacitor
for
many
applications.
regulator, the addition of a capacitor (nominal value
1
μ
F) from the output pin to ground will reduce
undershoot magnitude but increase its duration. In
the adjustable version, the addition of a capacitor,
C
FB
, from the output to the adjust pin will also
improve the transient response.
TPS736xx
SBVS038Q–SEPTEMBER 2003–REVISED AUGUST 2007
An internal 27k
resistor in series with the noise
reduction pin (NR) forms a low-pass filter for the
voltage reference when an external noise reduction
capacitor, C
NR
, is connected from NR to ground. For
C
NR
= 10nF, the total noise in the 10Hz to 100kHz
bandwidth is reduced by a factor of ~3.2, giving the
approximate relationship:
for C
NR
= 10nF.
This noise reduction effect is shown as RMS Noise
Voltage vs C
NR
in the
Typical Characteristics
section.
The TPS73601 adjustable version does not have the
noise-reduction pin available. However, connecting a
feedback capacitor, C
FB
, from the output to the FB pin
reduces output noise and improves load transient
performance.
The TPS736xx uses an internal charge pump to
develop an internal supply voltage sufficient to drive
the gate of the NMOS pass element above V
OUT
. The
charge pump generates ~250
μ
V of switching noise at
~4MHz; however, charge-pump noise contribution is
negligible at the output of the regulator for most
values of I
OUT
and C
OUT
.
For large step changes in load current, the TPS736xx
requires a larger voltage drop from V
IN
to V
OUT
to
avoid degraded transient response. The boundary of
this transient dropout region is approximately twice
the dc dropout. Values of V
IN
– V
OUT
above this line
ensure normal transient response.
Operating in the transient dropout region can cause
an increase in recovery time. The time required to
recover from a load transient is a function of the
magnitude of the change in load current rate, the rate
of
change
in
load
current,
headroom
(V
IN
to
V
OUT
worst-case conditions [full-scale instantaneous load
change with (V
IN
– V
OUT
) close to dc dropout levels],
the
TPS736xx
can
take
microseconds to return to the specified regulation
accuracy.
and
the
drop).
available
Under
voltage
a
couple
of
hundred
in
a
voltage
follower
As
with
any
12
Submit Documentation Feedback
Copyright 2003–2007, Texas Instruments Incorporated
Product Folder Link(s):
TPS736xx
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