AAT4644

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...