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201946A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 20, 2012
AAT4626
USB Dual-Channel Power Switch
DATA SHEET
8
Applications Information
Operation in Current Limit
If an excessive load is applied to either output of an
AAT4626, the load current will be limited by the device’s
current limit circuitry. Refer to the “Current Limit” curve
in the Typical Characteristics section of this datasheet. If
a short circuit were to occur on the load applied to either
the A or B output, there would be a demand for more cur-
rent than what is allowed by the internal current limiting
circuit and the voltage at the device output will drop. This
causes the AAT4626 to dissipate more power than in nor-
mal operation, causing the die temperature to increase.
When die temperature exceeds the internal over-temper-
ature threshold, the AAT4626 will shut down both the A
and B output channels. After shutting down, the AAT4626
cools to a level below the over-temperature threshold, at
which point it will start up again. The AAT4626 will con-
tinue to cycle off and on until one of the following events
occurs: the load current is reduced to a level below the
AAT4626’s current limit setting; the input power is
removed; or the output is turned off by a logic high level
applied to the EN pin.
Thermal Considerations
Since the AAT4626 has internal current limit and over-
temperature protection, junction temperature is rarely a
concern. If an application requires a large load current in
a high temperature operating environment, there is the
possibility that the over-temperature protection circuit
rather than the current limit circuit from one of the two
outputs will regulate the current available to the load. In
these applications, the maximum current available with-
out risk of activation of the over-temperature circuit can
be calculated. The maximum internal temperature while
current limit is not active can be calculated using
Equation 1:
TJ(MAX) = IMAX
2 ∙ RDS(ON)(MAX) ∙ RθJA + TA(MAX)
In Equation 1, IMAX is the maximum current required by
the load. RDS(ON)(MAX) is the maximum rated RDS(ON) of the
AAT4626 at high temperature. RqJA is the thermal resis-
tance between the device die and the board onto which it
is mounted. TA(MAX) is the maximum ambient temperature
for the printed circuit board assembly under the AAT4626
when the load switch is not dissipating power. Equation 1
can be transformed to provide IMAX; Refer to Equation 2.
=
IMAX
TSD(MIN) - TA(MAX)
RDS(ON)(MAX) ∙ RθJA
TSD(MIN) is the minimum temperature required to activate
the device over-temperature protection. The typical
thermal limit temperature specification is 125°C for the
AAT4626; for calculations, 115°C is a safe minimum
value to use.
For example, a portable device is specified to operate in
a 50°C environment. The printed circuit board assembly
will operate at temperatures as high as 85°C. This por-
table device has a sealed case and the area of the
printed board assembly is relatively small, causing RqJA to
be approximately 100°C/W. RDS(ON)(MAX) = 130mΩ. Using
Equation 2,
=
IMAX = 1.52A
115°C - 85°C
0.13Ω · 100°C/W
If this system requires less than 1.52A, the thermal limit
will not activate during normal operation.
Input Capacitor
The input capacitor serves two purposes. First, it pro-
tects the source power supply from transient current
effects generated by the application load circuit. If a
short circuit is suddenly applied to the output of an
AAT4626, there is a microsecond long period during
which a large current can flow before the current limit
circuit becomes active. Refer to the characteristic curve
“Short Circuit Through 0.3W." A properly sized input
capacitor can dramatically reduce the load switch input
transient response effects seen by the power supply and
other circuitry upstream from the AAT4626.
The second purpose of the input capacitor is to prevent
transient events generated by the load circuits from
effecting the operation of the AAT4626. For example, if
an AAT4626 is used in a circuit that operates from a 5V
power supply with poor step load response, it is possible
that turning on the load switch could cause the input
power supply to droop below the AAT4626's under-volt-
age lockout threshold. This drop in voltage would cause
the AAT4626 to turn off until the input power supply
voltage levels recover. Since this cycle would be self-
perpetuating, the entire circuit could be seen to be
unstable. In the very rare case where capacitor cost is
prohibitive and the input capacitor is omitted, the output
load circuit should be slew rate limited when turned on.