Datasheet > AAT4612IJS-T1

AAT4612IJS-T1

更新时间： 2024-02-18 20:46:16

品牌	Logo	应用领域
AAT		开关
页数	文件大小	规格书
11页	237K
描述
Current Limited Load Switch

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AAT4612IJS-T1 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	TSOJ, TSSOJ8,.09,20	Reach Compliance Code：	unknown
风险等级：	5.44	驱动器位数：	1
JESD-30 代码：	R-PDSO-J8	端子数量：	8
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSOJ
封装等效代码：	TSSOJ8,.09,20	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE	电源：	5 V
认证状态：	Not Qualified	子类别：	Peripheral Drivers
标称供电电压：	5 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子形式：	J BEND
端子节距：	0.5 mm	端子位置：	DUAL
Base Number Matches：	1

AAT4612IJS-T1 数据手册

AAT4612

Current Limited Load Switch

that accommodate this condition. The threshold

voltages are compatible with 5V TTL and 2.5V to

5V CMOS systems.

Applications Information

Input Capacitor

The input capacitor, C_IN, protects the power supply

from current transients generated by the load

attached to the AAT4612. When a short circuit is

suddenly applied to the output of the AAT4612, a

large current, limited only by the R_DS(ON)of the

MOSFET, will flow for less than 1µs before the cur-

rent limit circuitry activates. (See characteristic

curve "Short Circuit Through 0.3Ω.") In this event,

a moderately sized C_INwill dramatically reduce the

voltage transient seen by the power supply and by

other circuitry upstream from the AAT4612. The

extremely fast short-circuit response time of the

AAT4612 reduces the size requirement of C_IN.

When switching the AAT4612 on into a capacitive

load, the AAT4612 will charge the output capacitive

load at a rate no greater than the current limit setting.

Attaching Loads

Capacitive loads attached to an enabled AAT4612

will charge at a rate no greater than the current limit

setting.

Thermal Considerations

Since the AAT4612 has internal current limit and

over-temperature protection, junction temperature

is rarely a concern. However, if the application

requires large currents in a hot environment, it is

possible that temperature, rather than current limit,

will be the dominant regulating condition. In these

applications, the maximum current available with-

out risk of an over-temperature condition must be

calculated. The maximum internal temperature

while current limit is not active can be calculated

using Equation 1.

C_INshould be located as close to the device IN pin

as practically possible. Ceramic, tantalum, or alu-

minum electrolytic capacitors are appropriate for

C_IN. There is no specific capacitor ESR requirement

for C_IN. However, for higher current operation,

ceramic capacitors are recommended for C_INdue to

their inherent capability over tantalum capacitors to

withstand input current surges from low impedance

sources, such as batteries in portable devices.

Output Capacitor

T_J(MAX)= I_MAX²· R_DS(ON)(MAX)· R_ΘJA+ T_A(MAX)

Eq. 1:

In order to insure stability while current limit is

active, a small capacitance of approximately

0.47µF is required. No matter how large the output

capacitor, however, output current is limited to the

value set by the AAT4612 current limiting circuitry,

so very large output capacitors can be used.

In Equation 1, I_MAXis the maximum current

required by the load. R_DS(ON)(MAX)is the maximum

rated R_DS(ON)of the AAT4612 at high temperature.

R_θJAis the thermal resistance between the

AAT4612 die and the board onto which it is mount-

ed. T_A(MAX)is the maximum temperature that the

PCB under the AAT4612 would be if the AAT4612

were not dissipating power. Equation 1 can be

For example, USB ports are specified to have at

least 120µF of capacitance downstream from their

controlling power switch. The current limiting circuit

will allow an output capacitance of 1000µF or more

without disturbing the upstream power supply.

rearranged to solve for I_MAX

T_SD(MIN)- T_A(MAX)

_DS(ON)(MAX)· R_ΘJA

Eq. 2:

I_MAX

In many systems, power planes are controlled by

integrated circuits which run at lower voltages than

the power plane itself. The enable input (ON) of

the AAT4612 has low and high threshold voltages

T_SD(MIN)is the minimum temperature required to

activate the AAT4612 over-temperature protection.

4612.2006.09.1.3

1...5 6 789 10 11

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AAT4614IJS-1-T1	SKYWORKS	Buffer/Inverter Based Peripheral Driver, 1 Driver, 1A, PDSO8, ROHS COMPLIANT, SC70JW-8	获取价格
AAT4614IJS-2-T1	ANALOGICTECH	Peripheral Driver, 1 Driver, PDSO8,	获取价格

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