AME8806DEHAZ

更新时间： 2024-01-19 10:51:14

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
18页	181K
描述
600mA CMOS LDO

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AME8806DEHAZ 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

AME8806DEHAZ 数据手册

AME, Inc.

AME8806 / 8809 / 8842

n Detailed Description

600mA CMOS LDO

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.

The AME8806/8809/8842 family of CMOS regulators

contain a PMOS pass transistor, voltage reference, error

amplifier, over-current protection, and thermal shutdown.

n Enable

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^oC, or

the current exceeds 600mA. During thermal shutdown,

the output voltage remains low. Normal operation is re-

stored when the junction temperature drops below 120^oC.

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 qui-

escent current is less than 1mA. This pin behaves much

like an electronic switch.

The AME8806/8809/8842 switches from voltage mode

to current mode when the load exceeds the rated output

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

8842 also incorporates current foldback to reduce power

dissipation when the output is short circuited. This fea-

ture 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 AME8806/8809/8842 is stable with an output ca-

pacitor to ground of 2.2mF or greater. Ceramic capacitors

have the lowest ESR, and will offer the best AC perfor-

mance. Conversely, Aluminum Electrolytic capacitors

exhibit the highest ESR, resulting in the poorest AC re-

sponse. Unfortunately, large value ceramic capacitors are

comparatively expensive. One option is to parallel a 0.1mF

ceramic capacitor with a 10mF 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 0.1mF to have a beneficial effect.

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 ~

0.01mF. A larger capacitor improves the AC ripple rejec-

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

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

turn-on surges.

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