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AP2146 Datasheet(PDF) 15 Page - Diodes Incorporated

Part No. AP2146
Description  0.5A DUAL CHANNEL CURRENT-LIMITED POWER SWITCH
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Maker  DIODES [Diodes Incorporated]
Homepage  http://www.diodes.com
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AP2146 Datasheet(HTML) 15 Page - Diodes Incorporated

 
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AP2146/AP2156
0.5A DUAL CHANNEL CURRENT-LIMITED POWER
SWITCH
AP2146/AP2156 Rev 1
15 of 17
APRIL 2009
www.diodes.com
© Diodes Incorporated
Application Note
(Continued)
Generic Hot-Plug Applications
In many applications it may be necessary to remove modules or pc boards while the main unit is still
operating. These are considered hot-plug applications. Such implementations require the control of current
surges seen by the main power supply and the card being inserted. The most effective way to control these
surges is to limit and slowly ramp the current and voltage being applied to the card, similar to the way in
which a power supply normally turns on. Due to the controlled rise times and fall times of the
AP2146/AP2156, these devices can be used to provide a softer start-up to devices being hot-plugged into a
powered system. The UVLO feature of the AP2146/AP2156 also ensures that the switch is off after the card
has been removed, and that the switch is off during the next insertion.
By placing the AP2146/AP2156 between the VCC input and the rest of the circuitry, the input power reaches
these devices first after insertion. The typical rise time of the switch is approximately 1ms, providing a slow
voltage ramp at the output of the device. This implementation controls system surge current and provides a
hot-plugging mechanism for any device.
Marking Information
(1) SOP-8L
AP21X X
( Top view )
YY WW X X
Part Number
Logo
WW : Week : 01~52; 52
YY : Year : 08, 09,10~
G : Green
X : Internal Code
87
65
1
2
34
4 : Active Low
5 : Active High
6 : 2 Channel
represents 52 and 53 week
(2) MSOP-8L-EP
AP21X X
( Top view )
Y W X E
Part Number
Logo
Y : Year : 0~9
A~Z : Green
87
6
5
1
23
4
4 : Active Low
5 : Active High
6 : 2 Channel
A~Z : 27~52 week; Z represents
W : Week : a~z : 1~26 week;
52 and 53 week
MSOP-8L-EP


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