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參數(shù)資料
| 型號： | AME8833AEEV250Z |
| 廠商： | AME, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | High PSRR, 150mA CMOS LDO |
| 中文描述： | 高PSRR，150mA的CMOS LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 292K |
| 代理商： | AME8833AEEV250Z |
AME, Inc.
8
High PSRR, 150mA CMOS LDO
AME8833/8834
The AME8833/8834 is stable with an output capacitor
to ground of 0.22
μ
F or greater. Ceramic capacitors have
the lowest ESR, and will offer the best AC performance.
Conversely, Aluminum Electrolytic capacitors exhibit the
highest ESR, resulting in the poorest AC response.
A second capacitor is recommended between the in-
put and ground to stabilize Vin. The input capacitor should
be at least 1
μ
F to have a beneficial effect.
A larger capacitor improves the AC ripple rejection, but
also makes the output come up slowly. This "Soft" turn-
on is desirable in some applications to limit turn-on surges.
All capacitors should be placed in close proximity to
the pins. A "Quiet" ground termination is desirable. This
can be achieved with a "Star" connection.
n
Detailed Description
n
External Capacitors
n
Shutdown
When actively, pulled low, the PMOS pass transistor
shuts off, and all internal circuits are powered down. In
this state, the quiescent current is less than 1
μ
A. This
pin behaves much like an electronic switch.
The AME8833/8834 family of CMOS regulators con-
tain a PMOS pass transistor, voltage reference, error am-
plifier, over-current protection, and thermal shutdown.
The P-channel pass transistor receives data from the
error amplifier, over-current shutdown, and thermal pro-
tection circuits. During normal operation, the error ampli-
fier compares the output voltage to a precision reference.
Over-current and Thermal shutdown circuits become ac-
tive when the junction temperature exceeds 150
o
C, or
the current exceeds 150mA. During thermal shutdown,
the output voltage remains low. Normal operation is re-
stored when the junction temperature drops below 120
o
C.
The AME8833/8834 switches from voltage mode to cur-
rent mode when the load exceeds the rated output cur-
rent. This prevents over-stress. The AME8833/8834 also
incorporates current foldback to reduce power dissipa-
tion when the output is short circuited. This feature be-
comes active when the output drops below 0.8volts, and
reduces the current flow by 65%. Full current is restored
when the voltage exceeds 0.8 volts.
n
Adjustable Version
AME8834 features a user-adjustable output through an
external feedback resister divider. To set the output of
AME8834 use the following equation:
V
OUT
=V
ADJ
(1+R1/R2)
V
ADJ
=1.225V, use 1% or better resistors
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相關(guān)代理商/技術(shù)參數(shù) |
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| AME8853-AET330 | 制造商:AME 功能描述:High PSRR 60dB LDO,IQ 60 uA,300mA ,FIX 3.3V,SOT23,3K/REEL |
| AME8855-AET330 | 制造商:AME 功能描述:600mA,FIX 3.3V,SOT23,60dB,IN G O,3K/REEL |
| AME8855-AGT250 | 制造商:AME 功能描述:PSRR 60dB LDO,IQ 60 uA,600mA ,FIX 2.5V,SOT223,IGO,2.5K/Reel |
| AME8855-BET330 | 制造商:AME 功能描述:600mA,FIX 3.3V,SOT23,60dB,G O IN ,3K/REEL |
| AME8855-BGT250 | 制造商:AME 功能描述:PSRR 60dB LDO,IQ 60 uA,600mA ,FIX 2.5V,SOT223,GOI,2.5K/Reel |
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