Diodes AP2552/ AP2553/ AP2552A/ AP2553A - Manual (Page 12)

AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 8 - 2
12 of 16
www.diodes.com
February 2014
© Diodes Incorporated
AP2552/ AP2553/ AP2552A/ AP2553A
Application Note
(cont.)
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 AP2552/53 AND AP2552A/53A, 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 AP2552/53 AND AP2552A/53A also
ensures that the switch is off after the card has been removed, and that the switch is off during the next insertion.
Generic Hot-Plug Applications
By placing the AP2552/53 AND AP2552A/53A between the V
CC
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.
Ordering Information
Part Number
Enable
Active
Output Fault
Condition
Package
Code
Packaging
7” Tape and Reel
Quantity Part Number Suffix
AP2552W6-7
Low
Output Current
Limits
W6 SOT26 3000/Tape & Reel -7
AP2552FDC-7 FDC U-DFN2020-6 3000/Tape & Reel -7
AP2553W6-7
High
W6 SOT26 3000/Tape & Reel -7
AP2553FDC-7 FDC U-DFN2020-6 3000/Tape & Reel -7
AP2552AW6-7
Low
Output Latches
Off
W6 SOT26 3000/Tape & Reel -7
AP2552AFDC-7 FDC U-DFN2020-6 3000/Tape & Reel -7
AP2553AW6-7
High
W6 SOT26 3000/Tape & Reel -7
AP2553AFDC-7 FDC U-DFN2020-6 3000/Tape & Reel -7
Marking Information
(1) SOT26
1 2 3
6 7 4
XX Y W X
XX : Identification Code
Y : Year 0~9
X : Internal Code
( Top View )
5
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
Device Package Identification Code
AP2552W6 SOT26 BJ
AP2553W6 SOT26 BK
AP2552AW6 SOT26 BM
AP2553AW6 SOT26 BN
Package
AP 255X X XXX - 7
Packing
7 : Tape & Reel
Latch - off
Blank : Non Latch-off W6 : SOT26
FDC : U-DFN2020-6 A : Latch-off
Enable
2 : Active Low
3 : Active High