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參數(shù)資料
| 型號(hào)： | TPS73728 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 1A Low-Dropout Regulator with Reverse Current Protection |
| 中文描述： | 1A低壓差穩(wěn)壓器的反向電流保護(hù) |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 578K |
| 代理商： | TPS73728 |
www.ti.com
APPLICATION INFORMATION
INPUT AND OUTPUT CAPACITOR
REQUIREMENTS
Although an input capacitor is not required for
stability, it is good analog design practice to connect
a 0.1
μ
F to 1
μ
F low equivalent series resistance
(ESR) capacitor across the input supply near the
regulator. This capacitor counteracts reactive input
sources and improves transient response, noise
rejection,
and
ripple
rejection.
capacitor may be necessary if large, fast rise-time
load transients are anticipated or the device is
located several inches from the power source.
TPS737xx
GND
EN
IN
OUT
V
IN
V
OUT
OUTPUT NOISE
A precision bandgap reference is used to generate
the internal reference voltage, V
. This reference is
the dominant noise source within the TPS737xx and
it
generates
approximately
100kHz) at its output. The regulator control loop
gains up the reference noise with the same gain as
the reference voltage, so that the noise voltage of
the regulator is approximately given by:
TPS737xx
GND
EN
FB
IN
OUT
V
IN
V
OUT
V
=
OUT
′
1.204
(R + R )
R
1
2
R
1
C
FB
R
2
V
N
32 V
RMS
(R
1
R
2
)
R
2
32 V
RMS
V
OUT
V
REF
(1)
V
N
V
RMS
27
V
RMS
V
V
OUT
(V)
(2)
TPS737xx
SBVS067C–JANUARY 2006–REVISED AUGUST 2006
The TPS737xx belongs to a family of new generation
LDO regulators that use an NMOS pass transistor to
achieve
ultra-low-dropout
current blockage, and freedom from output capacitor
constraints. These features combined with an enable
input
make
the
TPS737xx
applications. This regulator family offers a wide
selection of fixed output voltage versions and an
adjustable output version. All versions have thermal
and
over-current
protection,
current limit.
performance,
reverse
ideal
for
portable
including
foldback
A
higher-value
Figure 25
shows the basic circuit connections for the
fixed
voltage
models.
connections
for
the
adjustable
(TPS73701).
Figure
26
output
gives
the
version
The TPS737xx requires a 1.0μF output capacitor for
stability. It is designed to be stable for all available
types and values of capacitors. In applications where
V
– V
< 0.5V and multiple low ESR capacitors
are in parallel, ringing may occur when the product of
C
OUT
and total ESR drops below 50n
F. Total ESR
includes all parasitic resistances, including capacitor
ESR and board, socket, and solder joint resistance.
In most applications, the sum of capacitor ESR and
trace resistance will meet this requirement.
Figure 25. Typical Application Circuit for
Fixed-Voltage Versions
32
μ
V
RMS
(10Hz
to
Figure 26. Typical Application Circuit for
Adjustable-Voltage Versions
Since the value of V
REF
is 1.2V, this relationship
reduces to:
R
1
and R
2
can be calculated for any output voltage
using the formula shown in
Figure 26
. Sample
resistor values for common output voltages are
shown in
Figure 2
.
Connecting a feedback capacitor, C
, from the
output to the FB pin reduces output noise and
improve load transient performance. This capacitor
should be limited to 0.1μF.
For best accuracy, make the parallel combination of
R
1
and R
2
approximately equal to 19k
. This 19k
,
in addition to the internal 8k
resistor, presents the
same impedance to the error amp as the 27k
bandgap reference output. This impedance helps
compensate
for
leakages
terminals.
The TPS737xx uses an internal charge pump to
develop an internal supply voltage sufficient to drive
the gate of the NMOS pass element above V
.
The charge pump generates ~250
μ
V of switching
noise
at
~2MHz;
however,
contribution is negligible at the output of the regulator
for most values of I
OUT
and C
OUT
.
into
the
error
amp
charge-pump
noise
10
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| TPS73730DRBR | 功能描述:低壓差穩(wěn)壓器 - LDO Sgl Out LDO,1A,Fixed Rev Crnt Prot RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS73730DRBT | 功能描述:低壓差穩(wěn)壓器 - LDO Sgl Out LDO,1A,Fixed Rev Crnt Prot RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS73733DCQ | 功能描述:低壓差穩(wěn)壓器 - LDO Cap-Free 1A LDO Reg RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS73733DCQ | 制造商:Texas Instruments 功能描述:Voltage Regulator |
| TPS73733DCQG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Sgl Output LDO 1A Fixed 3.3V RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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