ap2171dfm Diodes, Inc., ap2171dfm Datasheet - Page 12

• Manufacturer Part Number: ap2171dfm
• Description: 1a Single Channel Current-limited Power Switch With Output Discharge
• Manufacturer: Diodes, Inc.

Application Note
Power Dissipation and Junction Temperature
The low on-resistance of the internal MOSFET allows the small surface-mount packages to pass large current.
Using the maximum operating ambient temperature (T
Finally, calculate the junction temperature:
Where:
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 AP2161D/AP2171D, 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
AP2161D/AP2171D 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 AP2161D/AP2171D between the V
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
AP2161D/2171D
Document number: DS32250 Rev. 1 - 2
Notes:
AP21X1DSG-13
AP21X1DMPG-13
AP21X1DWG-7
AP21X1DFMG-7
P
T
T
R
P
D
J
A
D
θJA
= Ambient temperature °C
= P
6. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
Device
= R
= Total power dissipation
http://www.diodes.com/datasheets/ap02001.pdf.
= Thermal resistance
7 : Active High
6 : Active Low
D
DS(ON)
x R
Enable
θJA
× I
+ T
2
(Continued)
A
Package
Code
MP
FM
W
S
1 : 1 Channel
Channel
MSOP-8-EP
DFN2018-6
Packaging
AP 21 X 1 D XX G - X
(Note 6)
SOT25
SO-8
FM : DFN2018-6
MP : MSOP-8-EP
1A SINGLE CHANNEL CURRENT-LIMITED POWER
W : SOT25
www.diodes.com
S : SO-8
CC
Package
input and the rest of the circuitry, the input power reaches
A
12 of 18
) and R
2500/Tape & Reel
2500/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
DS(ON)
Quantity
SWITCH WITH OUTPUT DISCHARGE
, the power dissipation can be calculated by:
7”/13” Tape and Reel
G : Green
Green
AP2161D/AP2171D
Part Number Suffix
7/13 : Tape & Reel
-13
-13
Packing
-7
-7
© Diodes Incorporated
June 2010