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參數(shù)資料
| 型號： | AAT4280-1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | Slew Rate Controlled Load Switch |
| 中文描述： | 擺率控制的負(fù)荷開關(guān) |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 423K |
| 代理商： | AAT4280-1 |
AAT4280
Slew Rate Controlled Load Switch
10
4280.2002.2.0.92
Applications Information
Input Capacitor
Typically a 1μF or larger capacitor is recommend-
ed for C
IN
in most applications. A C
IN
capacitor is
not required for basic operation. However, C
IN
is
useful in preventing load transients from affecting
upstream circuits. C
IN
should be located as close
to the device V
IN
pin as practically possible.
Ceramic, tantalum or aluminum electrolytic capaci-
tors 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 capabil-
ity over tantalum capacitors to withstand input cur-
rent surges from low impedance sources such as
batteries in portable devices.
Output Capacitor
For proper slew operation, a 0.1μF capacitor or
greater between V
OUT
and GND is recommended.
The output capacitor has no specific capacitor type
or ESR requirement. If desired, C
OUT
may be
increased without limit to accommodate any load
transient condition without adversely affecting the
device turn on slew rate time.
Enable Function
The AAT4280 features an enable / disable function.
This pin (ON/OFF) is compatible with both TTL or
CMOS logic.
Reverse Output to Input Voltage
Conditions and Protection
Under normal operating conditions a parasitic
diode exists between the output and input of the
load switch. The input voltage should always
remain greater than the output load voltage main-
taining a reverse bias on the internal parasitic
diode. Conditions where V
OUT
might exceed V
IN
should be avoided since this would forward bias
the internal parasitic diode and allow excessive
current flow into the V
OUT
pin and possible damage
to the load switch.
In applications where there is a possibility of V
OUT
exceeding V
IN
for brief periods of time during nor-
mal operation, the use of a larger value C
IN
capaci-
tor is highly recommended. A larger value of C
IN
with respect to C
OUT
will effect a slower C
IN
decay
rate during shutdown, thus preventing V
OUT
from
exceeding V
IN
. In applications where there is a
greater danger of V
OUT
exceeding V
IN
for extended
periods of time, it is recommended to place a schot-
tky diode from V
IN
to V
OUT
(connecting the cathode
to V
IN
and anode to V
OUT
). The Schottky diode for-
ward voltage should be less then 0.45 volts.
Thermal Considerations and High
Output Current Applications
The AAT4280 is designed to deliver a continuous
output load current. The limiting characteristic for
maximum safe operating output load current is
package power dissipation. In order to obtain high
operating currents, careful device layout and circuit
operating conditions need to be taken into account.
The following discussions will assume the load
switch is mounted on a printed circuit board utiliz-
ing the minimum recommended footprint as stated
in the layout considerations section.
At any given ambient temperature (T
A
) the maxi-
mum package power dissipation can be deter-
mined by the following equation:
P
D(MAX)
= [T
J(MAX)
- T
A
] /
Θ
JA
Constants for the AAT4280 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.
The maximum continuous output current for the
AAT4280 is a function of the package power dissi-
pation and the R
DS
of the MOSFET at T
J(MAX)
. The
maximum R
DS
of the MOSFET at T
J(MAX)
is calcu-
lated by increasing the maximum room temperature
R
DS
by the R
DS
temperature coefficient. The tem-
perature coefficient (T
C
) is 2800ppm/°C. Therefore,
MAX R
DS
125°C = R
DS
25°C
×
(1 + T
C
×
T)
MAX R
DS
125°C = 120m
×
(1 + 0.0028
×
(125°C - 25°C)) = 154m
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