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參數(shù)資料
| 型號： | AAT4650IAS-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | Mechanism, ultra high soeed, rear paper feed with platen open switch |
| 中文描述： | 5V/3V PC卡電源開關(guān) |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 428K |
| 代理商： | AAT4650IAS-T1 |
Applications Information
Input Capacitor
Typically a 1μF or larger capacitor is recommended
for C
IN
. A C
IN
capacitor is not required for basic
operation, however, it is useful in preventing load
transients from affecting up stream circuits. C
IN
should be located as close to the device V
IN
pin as
practically possible. Ceramic, tantalum or aluminum
electrolytic capacitors may be selected for C
IN
.
There is no specific capacitor ESR requirement for
C
IN
. However, for higher current operation, ceramic
capacitors are recommended for C
IN
due to their
inherent capability over tantalum capacitors to with-
stand input current surges from low impedance
sources such as batteries in portable devices.
Output Capacitor
A 0.1μF or greater capacitor is generally required
between Vcc and GND. Likewise, with the output
capacitor, there is no specific capacitor ESR
requirement. If desired, C
OUT
may be increased to
accommodate any load transient condition.
Parallel Interface / Break Before Make
A two bit parallel interface determines the state of
the Vcc output. The logic levels are compatible with
CMOS or TTL logic. A logic low value must be less
than 0.8 volts, and a logic high value must be greater
than 2.4 volts. In cases where the interface pins rap-
idly change state directly from 3v to 5v (or vice
versa), internal break before make circuitry prevents
any back flow of current from one input power sup-
ply to the other. In addition, the body connections of
the internal P-channel MOSFET switches are
always set to the highest potential of Vcc3, Vcc5, or
Vcc, which prevents any body diode conduction,
power supply backflow, or possible device damage.
FAULT Output
The FAULT output is pulled to ground by an open
drain N-channel MOSFET during an over current or
output slew condition. It should be pulled up to the
reference power supply of the controller IC via a
nominal 100K
resistor.
Voltage Regulation
The PC Card Specification calls for a regulated 5
volt supply tolerance of +/-5%. Of this, a typical
power supply will drop less than 2%, and the PCB
traces will drop another 1%. This leaves 2% for the
AAT4650 as the PC card switch. In the PC card
application, the maximum allowable current for the
AAT4650 is dominated by voltage regulation rather
than by thermal considerations, and is set by either
the current limit or the maximum R
DS
of the P-chan-
nel MOSFET. The maximum R
DS
at 85°C is calcu-
lated by applying the R
DS
Tempco to the maximum
room temperature R
DS
:
R
DS(MAX)
= R
DS25
x (1 + TC x
T), or
R
DS(MAX)
= 105m
x (1 + 0.0028 x 60) = 122m
The maximum current is equal to the 2% tolerance
of the 5 volt supply (100mV) across the AAT4650
divided by R
DS(MAX)
. Or
I
MAX5
= 100mV / 122m
= 820mA
For the 3.3 volt supply in the PC card application,
the conditions are a bit relaxed, with the allowable
voltage regulation drop equal to 300mV. With a 2%
supply, and 1% PCB trace regulation, the PC card
switch can have a 200mV drop. So
I
MAX3
= 200mV / 134m
= 1.5A
Since 1.5A is the nominal current limit value, the
AAT4650 will current limit before I
MAX3
is reached.
Thermal issues are not a problem in the SO-8 pack-
age since
Θ
JA
, the package thermal resistance, is
only 120°C/W. At any given ambient temperature
(T
A
) the maximum package power dissipation can
be determined by the following equation:
P
D(MAX)
= [T
J(MAX)
- T
A
] /
Θ
JA
Constants for the AAT4650 are maximum junction
temperature, T
J(MAX)
= 125°C, and package thermal
resistance,
Θ
JA
= 120°C/W. Worst case conditions
are calculated at the maximum operating tempera-
ture where T
A
= 85°C. Typical conditions are cal-
culated under normal ambient conditions where T
A
= 25°C. At T
A
= 85°C, P
D(MAX)
= 333mW. At T
A
=
25°C, P
D(MAX)
= 833mW.
Maximum current is given by the following equation:
I
OUT(MAX)
= (P
D(MAX)
/ R
DS
)
1/2
For the AAT4650 at 85°C, I
OUT(MAX)
= 1.65A, a
value greater than the internal minimum
current
limit specification.
Overcurrent and Overtemperature
Protection
Because many AAT4650 applications provide power
to external devices, it is designed to protect its host
device from malfunctions in those peripherals
AAT4650
5V/3V PC Card Power Switch
8
4650.2001.
10.0.93
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT4650IHS-T1 | 5V/3V PC Card Power Switch |
| AAT4650 | 5V/3V PC Card Power Switch |
| AAT4650IHS-B1 | 5V/3V PC Card Power Switch |
| AAT4670IAS-T1 | Dual-Input, Dual-Output Load Switches |
| AAT4670IHS-T1 | Dual-Input, Dual-Output Load Switches |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT4650IHS-B1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:5V/3V PC Card Power Switch |
| AAT4650IHS-T1 | 制造商:Skyworks Solutions Inc 功能描述:AAT4650 Series 100 mOhm 2.5 A SMT Single Channel PC Card Power Switch - TSSOP-8 制造商:Skyworks Solutions Inc 功能描述:Power Switch ICs - Power Distribution 5V/3V PC Card Power Switch |
| AAT4651 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:5V/3V PC Card Power Switch |
| AAT4651IAS-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:5V/3V PC Card Power Switch |
| AAT4651IHS-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:5V/3V PC Card Power Switch |
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