Datasheet > AAT3218IGV-2.0-T1

AAT3218IGV-2.0-T1

更新时间： 2024-01-03 20:39:01

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ANALOGICTECH		/
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150mA MicroPower⑩ High Performance LDO

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AAT3218IGV-2.0-T1 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	,	Reach Compliance Code：	unknown
风险等级：	5.84	湿度敏感等级：	3
Base Number Matches：	1

AAT3218IGV-2.0-T1 数据手册

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AAT3218

150mA MicroPower™ High Performance LDO

In low output current applications where output

load is less than 10mA, the minimum value for

Applications Information

_OUTcan be as low as 0.47µF.

To assure the maximum possible performance is

obtained from the AAT3218, please refer to the fol-

lowing application recommendations.

Bypass Capacitor and Low Noise

Applications

Input Capacitor

A bypass capacitor pin is provided to enhance the

low noise characteristics of the AAT3218 LDO regu-

lator. The bypass capacitor is not necessary for

operation of the AAT3218. However, for best device

performance, a small ceramic capacitor should be

placed between the bypass pin (BYP) and the device

ground pin (GND). The value of C_BYPmay range

from 470pF to 10nF. For lowest noise and best pos-

sible power supply ripple rejection performance, a

10nF capacitor should be used. To practically realize

the highest power supply ripple rejection and lowest

output noise performance, it is critical that the capac-

itor connection between the BYP pin and GND pin be

direct and PCB traces should be as short as possi-

ble. Refer to the PCB Layout Recommendations

section of this datasheet for examples.

Typically, a 1µF or larger capacitor is recommend-

ed for C_INin most applications. A C_INcapacitor is

not required for basic LDO regulator operation.

However, if the AAT3218 is physically located more

than three centimeters from an input power source,

a C_INcapacitor will be needed for stable operation.

_INshould be located as close to the device V_INpin

as practically possible. C_INvalues greater than

1µF will offer superior input line transient response

and will assist in maximizing the highest possible

power supply ripple rejection.

Ceramic, tantalum, or aluminum electrolytic capac-

itors may be selected for C_IN. There is no specific

capacitor ESR requirement for C_IN. However, for

150mA LDO regulator output operation, ceramic

capacitors are recommended for C_INdue to their

inherent capability over tantalum capacitors to with-

stand input current surges from low impedance

sources, such as batteries in portable devices.

There is a relationship between the bypass capac-

itor value and the LDO regulator turn-on time and

turn-off time. In applications where fast device

turn-on and turn-off time are desired, the value of

C_BYPshould be reduced.

In applications where low noise performance and/

or ripple rejection are less of a concern, the bypass

capacitor may be omitted. The fastest device turn-

on time will be realized when no bypass capacitor

is used.

Output Capacitor

For proper load voltage regulation and operational

stability, a capacitor is required between pins V_OUT

and GND. The C_OUTcapacitor connection to

the LDO regulator ground pin should be made as

direct as practically possible for maximum device

performance.

DC leakage on this pin can affect the LDO regula-

tor output noise and voltage regulation perform-

ance. For this reason, the use of a low leakage,

high quality ceramic (NPO or C0G type) or film

capacitor is highly recommended.

The AAT3218 has been specifically designed to func-

tion with very low ESR ceramic capacitors. For best

performance, ceramic capacitors are recommended.

Typical output capacitor values for maximum output

current conditions range from 1µF to 10µF.

Applications utilizing the exceptionally low output

noise and optimum power supply ripple rejection

characteristics of the AAT3218 should use 2.2µF or

greater for C_OUT. If desired, C_OUTmay be increased

without limit.

Capacitor Characteristics

Ceramic composition capacitors are highly recom-

mended over all other types of capacitors for use

with the AAT3218. Ceramic capacitors offer many

advantages over their tantalum and aluminum elec-

trolytic counterparts. A ceramic capacitor typically

3218.2006.04.1.8

1...6 7 8910 11 12...18

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与AAT3218IGV-2.0-T1相关器件

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