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參數(shù)資料
| 型號： | AAT4280AIJS-2-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 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> | 204K |
| 代理商： | AAT4280AIJS-2-T1 |
AAT4280A
Slew Rate Controlled Load Switch
10
4280A.2005.11.1.3
Applications Information
Input Capacitor
A 1μF or larger capacitor is typically recommended
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 capac-
itors 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 AAT4280A features an enable / disable func-
tion. 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 possibly damage
the load switch.
In applications where there is a possibility of V
OUT
exceeding V
IN
for brief periods of time during normal
operation, the use of a larger value C
IN
capacitor 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
Schottky diode from V
IN
to V
OUT
(connecting the
cathode to V
IN
and anode to V
OUT
). The Schottky
diode forward voltage should be less than 0.45V.
Thermal Considerations and
High Output Current Applications
The AAT4280A 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 of this
datasheet.
At any given ambient temperature (T
A
), the maxi-
mum package power dissipation can be deter-
mined by the following equation:
Constants for the AAT4280A 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
AAT4280A is a function of the package power dis-
P
D(MAX)
[T
J(MAX)
- T
A
]
θ
JA
=
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