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參數(shù)資料
| 型號： | AP139-WA |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 300mA Low-Noise CMOS LDO |
| 中文描述： | 300mA的低噪聲CMOS LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 191K |
| 代理商： | AP139-WA |
AP139
300mA Low-Noise CMOS LDO
Typical Performance Characteristics (Continued)
Anachip Corp.
www.anachip.com.tw Rev.1.1 Jun 02, 2006
5/8
0
3.5
50
100
150
200
250
300
350
400
4
4.5
5
5.5
6
6.5
7
Vcc Vs Short Current
Vcc (V)
S
Top to bottom
Vout=1.5V
Vout=1.8V
Vout=2.5V
Vout=3.3V
Function Description
The AP139 of CMOS regulators contain a PMOS
pass transistor, voltage reference, error amplifier,
over-current protection, thermal shutdown.
The P-channel pass transistor receives data from
the error amplifier, over-current protection, and
thermal protection circuits. During normal operation,
the error amplifier compares the output voltage to a
precision reference. Over-current and thermal
shutdown circuits become active when the junction
temperature exceeds 130
C, or the current exceeds
300mA. During thermal shutdown, the output
voltage remains low. Normal operation is restored
when the junction temperature drops below 110
C.
The AP139 switches from voltage mode to current
mode when the load exceeds the rated output
current. This prevents over-stress.
Enable
The enable pin normally floats high. When actively,
pulled low, the PMOS pass transistor shut off, and
all internal circuits are powered down. In this state,
the quiescent current is less than 2μA. This pin
behaves much like an electronic switch.
External Capacitor
The AP139 is stable with a low ESR output
capacitor to ground of 1.0μF or greater. It can keep
stable even with higher ESR capacitors. A second
capacitor is recommended between the input and
ground to stabilize VIN. The input capacitor should
be larger than 0.1μF to have a beneficial effect. All
capacitors should be placed in close proximity to
the pins. A “quiet” ground termination is desirable.
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