SmartSwitch
™
AAT4601A
1.8A Current Limited P-Channel Switch
4601A.2006.05.1.5 1
General Description
The AAT4601A SmartSwitch is a member of
AnalogicTech's Application Specific Power
MOSFET™ (ASPM™) product family. It is a 1.8A
current limited P-channel MOSFET power switch
designed for high-side load switching applications.
This switch operates with inputs ranging from 2.7V
to 5.5V, making it ideal for both 3V and 5V systems.
An integrated current-limiting circuit protects the
input supply against large changes in load current
which could cause the supply to fall out of regula-
tion. The AAT4601A has protection from thermal
overload which limits power dissipation and junction
temperatures. The maximum current limit level will
guarantee that 1.8A can be delivered to the load;
the actual threshold is programmed with a resistor
from the SET pin to ground. The quiescent supply
current is typically 12µA. In shutdown mode, the
supply current decreases to less than 1µA.
The AAT4601A is available in a Pb-free, 8-pin SOP,
TSSOP, or MSOP package and is specified over
the -40°C to +85°C temperature range.
Features
• Input Voltage: 2.7V to 5.5V
• Programmable Over-Current Threshold
• Low Quiescent Current
— 12µA Typical
— Less Than 1µA with Switch Off
• Only 2.5V Needed for ON Control
• Thermal Shutdown
• Fault Flag
• 2ms Fault Blanking
• Under-Voltage Lockout
• Temperature Range: -40°C to +85°C
• 4kV ESD rating
• UL Approved—File No. E217765
• 8-Pin SOP, TSSOP, or MSOP Package
Applications
• Hot Swap Supplies
• Notebook Computers
• Peripheral Ports
• USB Ports
UL Recognized Component
Typical Application

AAT4601A
ON
IN
OUT
SET
GND
ON
1µF
100k Ω
R
SET 1µF
INPUT OUTPUT
IN OUT
FAULT
1
2
8
3
6
7
5
4