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參數(shù)資料
| 型號： | TPS73612DCQG4 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Cap-Free, NMOS, 400mA Low-Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，400mA的低壓差穩(wěn)壓器的反向電流保護(hù) |
| 文件頁數(shù)： | 11/23頁 |
| 文件大?。?/td> | 710K |
| 代理商： | TPS73612DCQG4 |
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 ESR capacitor across the input
supply near the regulator. This will counteract
reactive
input
sources
response, noise rejection, and ripple rejection. A
higher-value capacitor may be necessary if large,
fast rise-time load transients are anticipated or the
device is located several inches from the power
source.
Optional input capacitor
May improve source
impedance, noise, or PSRR.
Optional output capacitor.
May improve load transient,
noise, or PSRR.
Optional bypass
capacitor to reduce
output noise.
V
IN
V
OUT
IN
EN
GND
NR
OUT
TPS736xx
Output Noise
A precision band-gap reference is used to generate
the internal reference voltage, V
REF
. This reference is
the dominant noise source within the TPS736xx and
it
generates
approximately
100kHz) at the reference output (NR). 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:
V
N
32 V
RMS
(R
1
R
2
)
R
2
32 V
RMS
V
OUT
V
REF
(1)
TPS73601
GND
EN
FB
IN
OUT
V
IN
V
OUT
V
OUT
=
x 1.204
(R
1
+ R
2
)
R
2
R
1
C
FB
R
2
Optional input capacitor.
May improve source
impedance, noise, or PSRR.
Optional output capacitor.
May improve load transient,
noise, or PSRR.
Optional capacitor
reduces output noise
and improves
transient response.
V
N
( V
RMS
)
27
V
RMS
V
V
OUT
(V)
(2)
TPS736xx
SBVS038N–SEPTEMBER 2003–REVISED JANUARY 2007
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 TPS736xx 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 low noise
and an enable input, make the TPS736xx ideal for
portable 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
foldback current limit.
performance,
reverse
into
the
error
amp
protection,
including
and
improves
transient
Figure 31
shows the basic circuit connections for the
fixed
voltage
models.
connections
for
the
adjustable
(TPS73601).
Figure
32
output
gives
the
version
The TPS736xx does not require an output capacitor
for stability and has maximum phase margin with no
capacitor. It is designed to be stable for all available
types and values of capacitors. In applications where
V
IN
– V
OUT
< 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 31. Typical Application Circuit for
Fixed-Voltage Versions
32
μ
V
RMS
(10Hz
to
Since the value of V
REF
is 1.2V, this relationship
reduces to:
Figure 32. Typical Application Circuit for
Adjustable-Voltage Version
for the case of no C
NR
.
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:
R
1
and R
2
can be calculated for any output voltage
using the formula shown in
Figure 32
. Sample
resistor values for common output voltages are
shown in
Figure 2
.
For best accuracy, make the parallel combination of
R
1
and R
2
approximately euqal to 19k
. This 19k
,
11
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參數(shù)描述 |
|---|---|
| TPS73615DBVR | 功能描述:低壓差穩(wěn)壓器 - LDO Cap-Free NMOS 400mA 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 |
| TPS73615DBVRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Cap-Free NMOS 400mA 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 |
| TPS73615DBVT | 功能描述:低壓差穩(wěn)壓器 - LDO Cap-Free NMOS 400mA 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 |
| TPS73615DBVTG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Cap-Free NMOS 400mA 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 |
| TPS73615DCQ | 功能描述:低壓差穩(wěn)壓器 - LDO Cap-Free NMOS 400mA 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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