Datasheet > AAT4672

AAT4672

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
24页	1259K
描述
Power Supply Selector Switch

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中文翻译

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数据手册

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AAT4672 数据手册

PRODUCT DATASHEET

AAT4672

SmartSwitch

Power Supply Selector Switch

input current surges from low impedance sources such

as batteries in portable devices.

For MAIN (power supply 1 input):

⎛ V_IMAIN

I_CLMAIN

⎞

⎠

R_IMAIN

· 200k

⎝

Output Capacitor

A 1µF or greater capacitor is required between OUT and

GND (C_OUT). As with the input capacitor, there is no spe-

cific capacitor ESR requirement. If desired, C_OUTmay be

increased to accommodate any load transient condition.

⎛0.5V⎞

· 200k

⎝

⎠

= 50kΩ (49.9kΩ standard value)

For AUX (power supply 2 input):

EN Input

The AAT4672 is enabled when V_ENis ≤ 0.4V (logic ‘0’);

conversely, the AAT4672 is disabled when V_ENis ≥ 1.6V

(logic ‘1’).

⎛ V_IAUX

I_CLAUX

⎞

⎠

R_IAUX

· 200k

⎝

⎛0.5V⎞

· 200k

⎝

⎠

0.2A

PWRSEL Input

= 500kΩ (499.9kΩ standard value)

When V_PWRSELis ≤ 0.4V (logic ‘0’) the AUX-OUT current

limit is 20% of the current limit value programmed by

_IAUX; when V_PWRSELis ≥ 1.6V (logic ‘1’), the AUX-OUT

current limit is 100% of the current limit value pro-

grammed by R_IAUX

Thermal Considerations

Since the AAT4672 has an internal current limit and over-

temperature protection(thermal shutdown), junction tem-

perature is rarely a concern. However, if the application

requires large currents in a high temperature environ-

ment, it is possible that temperature rather than current

limit will be the dominant regulating condition. In these

applications, the maximum current available without 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 (Eq. 1).

Current Limit Resistor Selection

The current limits for power supply 1 and power supply

2 inputs are set by resistors between I_MAIN/I_AUXand GND.

The following equation can be used to select the appro-

priate resistor for a particular current limit:

⎛V_IMAIN/IAUX

R_IMAIN/IAUX

⎞

⎠

I_CLMAIN/AUX

· 200k

⎝

Eq. 1: T_J(MAX)= I_MAX2 · R_DS(ON)(MAX)· R_θJA+ T_A(MAX)

I_CLIMAIN/AUXCurrent limit for MAIN and/or AUX pins

respectively

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

AAT4672 at high temperatures (consult the “R_DSONvs.

Temperature” performance graph in the “Typical

Characteristics” section of this datasheet). For estimat-

ing the R_DS(ON)(MAX)use the data on the “R_DSONvs

Temperature” performance graph and increase the value

from the performance graph by 50%. R_θJAis the thermal

resistance between the AAT4672 die and the printed

circuit board (PCB) onto which it is mounted; R_θJAis the

thermal resistance of the TSOPJW-12 package. T_A(MAX)is

the maximum ambient temperature that the PCB under

the AAT4672 would be if the AAT4672 were not dissipat-

V_IMAIN/IAUXInternally Regulated Voltage [0.5V ± 20%]

on the IMAIN and IAUX pins respectively

R_IMAIN/IAUXIMAIN and/or IAUX Resistor

200k

Internal Gain Factor

Design Example

A particular application requires that the current limit for

MAIN be set to 2A and the current limit for AUX be set

to 0.2A. What value of resistor is required for the IMAIN

and IAUX pins respectively?

ing power. Equation 1 can be rearranged to solve for I_MAX

into Equation 2 (Eq. 2).

w w w . a n a l o g i c t e c h . c o m

4672.2008.04.1.0

1...6 7 8910 11 12...24

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