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参数资料
| 型号： | AME8847AEGT330Z |
| 厂商： | AME, Inc. |
| 英文描述： | 800mA CMOS LDO |
| 中文描述： | 800mA的CMOS低压 |
| 文件页数： | 6/12页 |
| 文件大小： | 174K |
| 代理商： | AME8847AEGT330Z |
AME, Inc.
6 Rev.A.01
800mA CMOS LDO
AME8847
The AME8847 of CMOS regulators contains a PMOS
pass transistor, voltage reference, error amplifier, 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 900mA. During thermal shutdown,
the output voltage remains low. Normal operation is re-
stored when the junction temperature drops below 120
o
C.
The AME8847 switches from voltage mode to current
mode when the load exceeds the rated output current.
This prevents over-stress. The AME8847 also incorpo-
rates current foldback to reduce power dissipation when
the output is short circuited. This feature becomes active
when the output drops below 0.8 volts, and reduces the
current flow by 65%. Full current is restored when the
voltage exceeds 0.8 volts.
n
Detailed Description
n
External Capacitors
The AME8847 is stable with an output capacitor to
ground of 2.2
μ
F or greater. Ceramic capacitors have the
lowest ESR, and will offer the best AC performance. Con-
versely, Aluminum Electrolytic capacitors exhibit the high-
est ESR, resulting in the poorest AC response. Unfortu-
nately, large value ceramic capacitors are comparatively
expensive. One option is to parallel a 0.1
μ
F ceramic ca-
pacitor with a 10
μ
F Aluminum Electrolytic. The benefit is
low ESR, high capacitance, and low overall cost.
A second capacitor is recommended between the in-
put and ground to stabilize Vin. The input capacitor should
be at least 0.1
μ
F to have a beneficial effect.
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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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