SmartSwitch
™
AAT4612
Current Limited Load Switch
Preliminary
Information
4612.2002.1.0.9 1
General Description
The AAT4612 SmartSwitch™ is a member of
AnalogicTech's Application Specific Power MOS-
FET™ (ASPM™) product family. It is a Current
Limited P-channel MOSFET power switch designed
for high-side load-switching applications operating
with inputs ranging from 2.4V to 5.5V which makes it
ideal for both 3V and 5V systems. An integrated cur-
rent-limiting circuit protects the input supply from large
currents which potentially cause the supply to fall out
of regulation. In addition, the AAT4612 thermal over-
load protection limits power dissipation and junction
temperatures associated with prolonged periods of
operation in current limit. Due to its low R
DS(ON)
, the
AAT4612 can be used to control loads that require up
to 1Aeven while operating at high ambient tempera-
tures. The ultra fast current-limit response to a sud-
den short circuit is a mere 500ns which reduces the
requirements of local supply bypassing. Quiescent
current is a low 10µAand in shutdown mode, the
supply current decreases to less than 1µA.
The AAT4612 is available in a 5-pin SOT23, and an
8-pin SC70JW specified over a -40 to 85°C temper-
ature range.
The AAT4600 Series is a family of adjustable and
fixed SmartSwitch™ products with a range of current
handling capabilities. Available are single versions
with adjustable current limit (AAT4610, AAT4601) as
well as fixed current limit (AAT4625), and dual ver-
sions with fixed current limit (AAT4626, AAT4670).
Features
•2.4V to 5.5V Input voltage range
• 1Acurrent limit trip threshold
• Fast transient response:
• <1µs response to short circuit
• Low quiescent current
•10µAtyp
• 1µAmax with Switch off
• 100mΩ typical R
DS(ON)
• Undervoltage Lockout
• Thermal Shutdown
• Temp range -40 to 85°C
• 4kV ESD Rating
• 5-pin SOT23 package
• 8-pin SC70JW package
Applications
• Peripheral ports
• Notebook computers
• Personal communication devices
• Hot swap supplies
Typical Application
AAT4612
SOT23
ON
IN OUT
GND
ON
INPUT
GND GND
C
IN
1µF
C
OUT
0.47µF
V
CC
1
2
5
4