- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375223 > AAT4650IHS-T1 (Advanced Analogic Technologies, Inc.) 5V/3V PC Card Power Switch PDF資料下載
參數(shù)資料
| 型號(hào)： | AAT4650IHS-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 5V/3V PC Card Power Switch |
| 中文描述： | 5V/3V PC卡電源開關(guān) |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 428K |
| 代理商： | AAT4650IHS-T1 |
through slew rate control, current limiting, and ther-
mal limiting. The AAT4650 current limit and thermal
limit serve as an immediate and reliable electronic
fuse without any increase in R
DS
for this function.
Other solutions such as a poly fuse do not protect
the host power supply and system from mishandling,
or short circuited peripherals, they will only prevent a
fire. The AAT4650 high speed current limit and
thermal limit not only prevent fires, they also isolate
the power supply and entire system from any activi-
ty at the external port, and report a mishap by means
of a FAULT signal.
Overcurrent and overtemperature go hand in hand.
Once an overcurrent condition exists, the current
supplied to the load by the AAT4650 is limited to the
overcurrent threshold. This results in a voltage drop
across the AAT4650 which causes excess power
dissipation and a package temperature increase. As
the die begins to heat up, the overtemperature circuit
is activated. If the temperature reaches the maxi-
mum level, the AAT4650 automatically switches off
the P-channel MOSFETs. While they are off, the
overtemperature circuit remains active. Once the
temperature has cooled by approximately 10°C, the
P-channel MOSFETs are switched back on. In this
manner, the AAT4650 is thermally cycled on and off
until the short circuit is removed. Once the short is
removed, normal operation automatically resumes.
To save power, the full high speed overcurrent cir-
cuit is not activated until a lower threshold of cur-
rent (approximately 700mA) is exceeded in the
power device. When the load current exceeds this
crude threshold, the AAT4650 quiescent current
increases from 15μA to 150μA. The high speed
overcurrent circuit works by linearly limiting the cur-
rent when the current limit is reached. As the volt-
age begins to drop on Vcc due to current limiting,
the current limit magnitude varies, and generally
decreases as the Vcc voltage drops to 0 volts.
Switching Vcc Voltage
The AAT4650 meets PC card standards for switch-
ing the Vcc output by providing a ground path for
Vcc as well as a hi impedance state. The PC card
protocol for determining low voltage operations is
to first power the peripheral with 5 volts and poll for
3.3 volt operation. When transitioning from 5 volts
to 3.3 volts, Vcc must be discharged to less than
0.8 volts to provide a hard reset. The resistive
ground state (CTL1=0, CTL0=0) will accommodate
this. The ground state will also guarantee the Vcc
voltage to be discharged within the specified
100ms amount of time.
Printed Circuit Board Layout
Recommendations
For proper thermal management, to minimize PCB
trace resistance, and to take advantage of the low
R
DS(ON)
of the AAT4650, a few circuit board layout
rules should be followed: Vcc3, Vcc5, and Vcc
should be routed using wider than normal traces, the
two Vcc pins (6 and 7) should be connected to the
same wide PCB trace, and GND should be connect-
ed to a ground plane. For best performance, C
IN
and
C
OUT
should be placed close to the package pins.
AAT4650
5V/3V PC Card Power Switch
4650.2001.
10
.0.9
3
9
Typical PC Card Application Circuit
V
CC
5
V
CC
3
CTL1
CTL0
FAULT
GND
V
CC
AAT4650
8
5
3
2
4
1
6,7
V
CC
Power
Supply
5V
3.3V
PC Card
Controller
PC Card
Slot
CTL1
CTL0
FAULT
100K
V
CC
C
IN3
1
μ
F
C
IN5
1
μ
F
C
OUT
0.1
μ
F
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| AAT4670 | Dual-Input, Dual-Output Load Switches |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| AAT4670 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual-Input, Dual-Output Load Switches |
| AAT4670_06 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual-Input, Dual-Output Load Switch |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。