DATA SHEET
AAT4616: Ultrahigh Precision Adjustable Current Limited
Load Switch with Fault Flag
Applications
Description
The AAT4616 SmartSwitch is a current-limit P-channel MOSFET
power switch designed for high-side load switching applications.
This switch operates with inputs ranging from 2.4 V to 5.5 V,
making it ideal for both 3 V and 5 V systems. An integrated, highly
accurate current-limit circuit protects the input supply against
large currents, which may cause the supply to fall out of
regulation. Reverse current blocking is provided to protect the
load switch from reverse current flows while the device is in
shutdown.
USB ports
Portable products
Hot-swap supplies
Notebook computers
Proprietary peripheral ports
Features
The AAT4616 is also protected from thermal overload, which
limits power dissipation and junction temperature. Current-limit
threshold is programmed with a resistor from SET to ground, and
is adjusted for load levels up to 1.6 A. The ultrafast current limit
response to a sudden short circuit is 2 s, which reduces the
requirements of local supply bypassing. An open-drain FAULT flag
signals an over-current or over-temperature condition. To prevent
false reporting, a 4 ms time interval is used at startup (charging a
capacitive load), where fault conditions are not monitored and
reported. Quiescent current is a low 10 A and the supply current
decreases to less than 1 A in shutdown mode.
Input voltage: 2.4 V to 5.5 V
Programmable over-current limit setting: 300 mA to 1.6 A
5ꢀ current limit precision at 750 mA
Fast transient response: 2 s response to short circuit
Low quiescent current:
10 A typical while enabled
1 A maximum with switch off
130 m typical RDS(ON)
Under-voltage lockout (UVLO)
Reverse blocking during disable
4 ms fault masking at startup (capacitive load)
Fault flag open-drain output
The AAT4616 is offered in small Pb-free, 5-pin SOT23-5 and
TDFN22-8 packages, and is specified for operation over the
–40°C to +85°C ambient temperature range.
A typical application circuit is shown in Figure 1. The pin
configuration is shown in Figure 2. Signal pin assignments and
functional pin descriptions are provided in Table 1.
Active High/Low enable options
Over-temperature protection
Temperature range: 40 °C to +85 °C
5-pin SOT23-5 and 8-pin TDFN package (MSL1, 260 °C per
JEDEC-J-STD-020)
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
V
IN
V
OUT
IN
OUT
FLT
2.4 V ~ 5.5 V
AAT4616
0.47 μF
1 μF
ON/ON
100 kΩ
EN/EN
GND
SET
Fault
Flag
RSET
tc79
Figure 1. AAT4616 Typical Application Circuit
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201940E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • September 11, 2013
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