參數(shù)資料
型號(hào): AME8838BEIU180Z
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): 10/19頁
文件大?。?/td> 280K
代理商: AME8838BEIU180Z
AME, Inc.
10
High PSRR, 150mA CMOS LDO
AME8838
Rev.E.04
The AME8838 is stable with an output capacitor to
ground of 1
μ
F or larger. Ceramic capacitors have the low-
est ESR, and will offer the best AC performance. Con-
versely, Aluminum Electrolytic capacitors exhibit the high-
est ESR, resulting in the poorest AC response.
A second capacitor is recommended between the in-
put and ground to stabilize V
. The input capacitor should
be at least 1
μ
F to have a beneficial effect.
n
Detailed Description
n
External Capacitors
n
Enable
The Enable Pin is normally pull-high. When activated
pulled low, the PMOS pass transistor shuts off, and all
internal circuits are powered down. In this state, the stand
by current is less than 1
μ
A. This pin can
t be floating.
The AME8838 family of CMOS regulators contain 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 150mA. During thermal shutdown,
the output voltage remains low. Normal operation is re-
stored when the junction temperature drops below 130
o
C.
The AME8838 switches from voltage mode to current
mode when the load exceeds the rated output current.
This prevents over-stress.
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