AAT4644 Datasheet, PDF (1/8 Pages) Advanced Analogic Technologies – 4-Channel Current Limited Load Switch

AAT4644
4-Channel Current Limited Load Switch
General Description
Features
SmartSwitch^™
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.
• 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
AAT4644 ^{OUT2 3}
OUT3 ⁸
GND
OUT4 ⁶
4
OUTPUT1
OUTPUT2
OUTPUT3
OUTPUT4
4644.2006.05.1.2
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