4-Channel Current Limited Load Switch
AAT4644
4-Channel Current Limited Load Switch General Description
The AAT4644 is a four-channel resettable fuse. It util...
Description
AAT4644
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. Each switch's current limit is factory programmed at 1A. Additional protection is provided with undervoltage 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 RDS(ON) and higher current limit. The AAT4644 is available in 8 pin TSSOP or SOP packages, specified over -40 to 85°C.
Features
SmartSwitch™
500mA per channel steady state 4 X 1A current limit trip point Over-temp protection Fast transient response: 1µs (typ) response to short circuit 100mΩ typical RDS(ON) Undervoltage Lockout Temp range -40 to 85°C 8 pin TSSOP or SOP packages
Preliminary Information
Applications
USB ports Peripheral ports Desktop PCs
Typical Application
INPUT 3.3V - 5V
2,7
IN
OUT1
1 3 8 6
OUTPUT1 OUTPUT2 OUTPUT3 OUTPUT4
AAT4644
GND
4
OUT2 OUT3 OUT4
4644.2002.01.0.92
1
AAT4644
4-Channel Current Limited Load Switch Pin Descriptions
Pin #
1 2, 7 3 4 5 6 8
Symbol
OUT1 IN OUT2 GND NC OUT4 OUT3
Function
Channel 1 output These pins are the input supply to the circuit Channel 2 output Ground connection Not internally connected Channel 4 output Channel 3 output
Pi...
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