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參數(shù)資料
| 型號(hào)： | AAT3236IJS-35-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 300mA CMOS High Performance LDO |
| 中文描述： | 300mA的LDO穩(wěn)壓器的CMOS高性能 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大小： | 448K |
| 代理商： | AAT3236IJS-35-T1 |
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ciated with a capacitor, which includes lead resist-
ance, internal connections, size and area, material
composition and ambient temperature. Typically
capacitor ESR is measured in milliohms for ceramic
capacitors and can range to more than several ohms
for tantalum or aluminum electrolytic capacitors.
Ceramic Capacitor Materials:
tors less than 0.1μF are typically made from NPO
or COG materials. NPO and COG materials are
typically tight tolerance very stable over tempera-
ture. Larger capacitor values are typically com-
posed of X7R, X5R, Z5U and Y5V dielectric mate-
rials. Large ceramic capacitors, typically greater
then 2.2μF are often available in the low cost Y5V
and Z5U dielectrics. These two material types are
not recommended for use with LDO regulators
since the capacitor tolerance can vary more than
±50% over the operating temperature range of the
device. A2.2μF Y5V capacitor could be reduced to
1μF over temperature, this could cause problems
for circuit operation. X7R and X5R dielectrics are
much more desirable. The temperature tolerance
of X7R dielectric is better than ±15%.
Ceramic capaci-
Capacitor area is another contributor to ESR.
Capacitors which are physically large in size will
have a lower ESR when compared to a smaller sized
capacitor of equivalent material and capacitance
value. These larger devices can improve circuit
transient response when compared to an equal
value capacitor in a smaller package size.
Consult capacitor vendor data sheets carefully
when selecting capacitors for LDO regulators.
Enable Function
The AAT3236 features an LDO regulator enable /
disable function. This pin (EN) is active high and is
compatible with CMOS logic. To assure the LDO
regulator will switch on, the EN turn on control level
must be greater than 2.0 volts. The LDO regulator
will go into the disable shutdown mode when the
voltage on the EN pin falls below 0.6 volts. If the
enable function is not needed in a specific applica-
tion, it may be tied to V
IN
to keep the LDO regula-
tor in a continuously on state.
When the LDO regulator is in the shutdown mode,
an internal 1.5k
resistor is connected between
V
OUT
and GND. This is intended to discharge C
OUT
when the LDO regulator is disabled. The internal
1.5k
has no adverse effect on device turn on time.
Short Circuit Protection
The AAT3236 contains an internal short circuit pro-
tection circuit that will trigger when the output load
current exceeds 750mA. Under short circuit condi-
tions the output will be limited to 750mA until the
LDO regulator package power dissipation exceeds
the device thermal limit or the until the short circuit
condition is removed.
Thermal Protection
The AAT3236 has an internal thermal protection cir-
cuit which will turn on when the device die temper-
ature exceeds 150°C. The internal thermal protec-
tion circuit will actively turn off the LDO regulator
output pass device to prevent the possibility of over
temperature damage. The LDO regulator output
will remain in a shutdown state until the internal die
temperature falls back below the 150°C trip point.
The combination and interaction between the short
circuit and thermal protection systems allow the
LDO regulator to withstand indefinite short circuit
conditions without sustaining permanent damage.
No-Load Stability
The AAT3236 is designed to maintain output volt-
age regulation and stability under operational no-
load conditions. This is an important characteristic
for applications where the output current may drop
to zero.
Reverse Output to Input Voltage
Conditions and Protection
Under normal operating conditions a parasitic
diode exists between the output and input of the
LDO regulator. The input voltage should always
remain greater than the output load voltage main-
taining a reverse bias on the internal parasitic
diode. Conditions where V
OUT
might exceed V
IN
should be avoided since this would forward bias
the internal parasitic diode and allow excessive
current flow into the V
OUT
pin possibly damaging
the LDO regulator.
In applications where there is a possibility of V
OUT
exceeding V
IN
for brief amounts of time during nor-
mal operation, the use of a larger value C
IN
capaci-
tor is highly recommended. A larger value of C
IN
with respect to C
OUT
will effect a slower C
IN
decay
rate during shutdown, thus preventing V
OUT
from
exceeding V
IN
. In applications where there is a
greater danger of V
OUT
exceeding V
IN
for extended
AAT3236
300mA CMOS High Performance LDO
3236.2001.11.0.9
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3237 | 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:300mA MicroPower⑩ LDO with PowerOK |
| AAT3237BIGU-2.6-T1 | 制造商:Skyworks Solutions Inc 功能描述:300mA MicroPower LDO-Linear Regulator |
| AAT3237BIGU-2.85-T1 | 制造商:Skyworks Solutions Inc 功能描述:300mA MicroPower LDO-Linear Regulator |
| AAT3237BIGU-2.8-T1 | 制造商:Skyworks Solutions Inc 功能描述:300mA MicroPower LDO-Linear Regulator |
| AAT3237BIGU-2.9-T1 | 制造商:Skyworks Solutions Inc 功能描述:300mA MicroPower LDO-Linear Regulator |
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