AME8806MEHA

更新时间： 2024-01-25 08:00:24

品牌	Logo	应用领域
安茂微 - AME		稳压器电源电路
页数	文件大小	规格书
12页	93K
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600mA CMOS LDO

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AME8806MEHA 技术参数

生命周期：	Contact Manufacturer	包装说明：	,
Reach Compliance Code：	compliant	风险等级：	5.59
Base Number Matches：	1

AME8806MEHA 数据手册

Analog Microelectronics, Inc.

600mA CMOS LDO

AME8806 / 8809 / 8842

n Detailed Description

The AME8806/8809 family of CMOS regulators con-

tain a PMOS pass transistor, voltage reference, error

amplifier, over-current protection, and thermal shut-

down.

A third capacitor can be connected between the BY-

PASS pin and GND. This capacitor can be a low cost

Polyester Film variety between the value of 0.001 ~

0.01µF. A larger capacitor improves the AC ripple re-

jection, but also makes the output come up slowly. This

"Soft" turn-on is desirable in some applications to limit

turn-on surges.

The P-channel pass transistor receives data from the

error amplifier, over-current shutdown, and thermal pro-

tection circuits. During normal operation, the error am-

plifier compares the output voltage to a precision refer-

ence. Over-current and Thermal shutdown circuits be-

come active when the junction temperature exceeds

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.

150 C, or the current exceeds 600mA. During thermal

shutdown, the output voltage remains low. Normal op-

eration is restored when the junction temperature drops

below 120 C.

n Enable

The Enable pin normally floats high. 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 1µA. This pin behaves

much like an electronic switch.

The AME8806/8809 switches from voltage mode to cur-

rent mode when the load exceeds the rated output cur-

rent. This prevents over-stress. The AME8806/8809

also incorporates current foldback to reduce power dis-

sipation 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 External Capacitors

The AME8806/8809 is stable with an output capacitor

to ground of 2.2µF 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.

Unfortunately, large value ceramic capacitors are com-

paratively expensive. One option is to parallel a 0.1µF

ceramic capacitor with a 10µF Aluminum Electrolytic.

The benefit is low ESR, high capacitance, and low over-

all cost.

A second capacitor is recommended between the input

and ground to stabilize Vin. The input capacitor should

be at least 0.1µF to have a beneficial effect.

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