4-Channel Current Limited Load Switch
General Description
The AAT4644 is a four-channel resettable fuse. It
utilizes independent current-limited and thermally-
protected P-channel MOSFETs to protect against
short circuits. Current limit is factory programmed
at 1A. Additional protection is provided with under-
voltage lockout. The switches are turned off when
the input voltage drops below a preset level. The
quiescent supply current is typically 20µA. The
AAT4644 is a flexible solution, allowing system
designers to gang outputs together for lower
R
DS(ON)
and higher current limit.
The AAT4644 is available in a Pb-free, 8-pin
TSSOP or SOP package and is specified over the
-40°C to +85°C temperature range.
AAT4644
Features
•
•
•
•
•
•
•
•
SmartSwitch
™
500mA per Channel Steady State
4 x 1A Current Limit Trip Point
Over-Temperature Protection
Fast Transient Response:
— 1µs (Typ) Response to Short Circuit
100mΩ Typical R
DS(ON)
Under-Voltage Lockout
Temperature Range: -40°C to +85°C
8-Pin TSSOP or SOP Package
Applications
•
•
•
Desktop PCs
Peripheral Ports
USB Ports
Typical Application
INPUT
3.3V - 5V
2, 7
IN
OUT1
1
3
8
6
OUTPUT1
OUTPUT2
OUTPUT3
OUTPUT4
AAT4644
GND
4
OUT2
OUT3
OUT4
4644.2006.05.1.2
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
