Datasheet > AAT4282A

AAT4282A

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		开关
页数	文件大小	规格书
14页	547K
描述
Dual Slew Rate Controlled Load Switch

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AAT4282A 数据手册

AAT4282A

Dual Slew Rate Controlled Load Switch

proprietary turn-on current control method works

by careful control and monitoring of the MOSFET

gate voltage. When the device is switched ON,

the gate voltage is quickly increased to the thresh-

old level of the MOSFET. Once at this level, the

current begins to slew as the gate voltage is slow-

ly increased until the MOSFET becomes fully

enhanced. Once it has reached this point the gate

is quickly increased to the full input voltage and

the R_DS(ON)is minimized.

Applications Information

Input Capacitor

A 1μF or larger capacitor is typically recommended

for C_INin most applications. A C_INcapacitor is not

required for basic operation; however, it is useful in

preventing load transients from affecting upstream

circuits. C_INshould be located as close to the

device VIN pin as practically possible. Ceramic,

tantalum, or aluminum electrolytic capacitors may

be selected for C_IN. There is no specific capacitor

equivalent series resistance (ESR) requirement for

C_IN. However, for higher current operation, ceram-

ic 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.

The second version, the AAT4282A-2, is a very

fast switch intended for high-speed switching

applications.

This version has no turn-on slew rate control and

no special output discharge features. The final

switch version, the AAT4282A-3, has the addition

of a minimized slew rate limited turn-on function

and a shutdown output discharge circuit to rapidly

turn off a load when the load switch is disabled

through the ON/OFF pin. Using the FAST input pin

on the AAT4282A-3, the device can be manually

switched to a slower slew rate.

Output Capacitor

For proper slew operation, a 0.1μF capacitor or

greater is required between VOUT and GND.

Likewise, with the output capacitor, there is no spe-

cific capacitor ESR requirement. If desired, C_OUT

may be increased without limit to accommodate

any load transient condition without adversely

affecting the slew rate.

All versions of the AAT4282A operate with input

voltages ranging from 1.5V to 6.5V. All versions of

this device have extremely low operating current,

making them ideal for battery-powered applications.

The ON/OFF control pin is TTL compatible and will

also function with 2.5V to 5V logic systems, making

the AAT4282A an ideal level-shifting load switch.

Enable Function

The AAT4282A features an enable / disable func-

tion. This pin (ON) is active high and is compatible

with TTL or CMOS logic. To assure the load switch

will turn on, the ON control level must be greater

than 1.4V. The load switch will go into shutdown

mode when the voltage on the ON pin falls below

0.4V. When the load switch is in shutdown mode,

the OUT pin is tri-stated, and quiescent current

drops to leakage levels below 1μA.

Reverse Output-to-Input Voltage

Conditions and Protection

Under normal operating conditions, a parasitic

diode exists between the output and input of the

load switch. The input voltage should always

remain greater than the output load voltage, main-

taining a reverse bias on the internal parasitic

diode. Conditions where V_OUTmight exceed V_IN

should be avoided since this would forward bias

4282A.2007.09.1.1

1...6 7 8910 11 12...14

中文翻译

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与AAT4282A相关器件

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AAT4282A_08	ANALOGICTECH	获取价格	Slew Rate Controlled Load Switch
AAT4282A-1	ANALOGICTECH	获取价格	Slew Rate Controlled Load Switch
AAT4282A-2	ANALOGICTECH	获取价格	Slew Rate Controlled Load Switch
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AAT4282AIFS-3-T1	ANALOGICTECH	获取价格	Power Management Circuit,
AAT4282AIPS-3-T1	ANALOGICTECH	获取价格	Dual Slew Rate Controlled Load Switch
AAT4282B	SKYWORKS	获取价格	Slew Rate Controlled Load Switch
AAT4282BIPS-3-T1	SKYWORKS	获取价格	Slew Rate Controlled Load Switch
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