ACE345E

Adjustable USB Load Current Switch

VER 1.2

1

Description

The ACE345E is a load switch which provides full protection to systems and loads which may

encounter large current conditions. ACE345E

offers a 95mΩ current-limited switch which can operate

over an input voltage range of 2.5-5.5V. The current limit can be externally programmed by a precision

resistor, ranges from 75mA to 1.7A. Switch control is by a logic input (EN) capable of interfacing directly

with low voltage control signals. Current is prevented from flowing when the switch is off and the output

voltage is higher than the input voltage. ACE345E also features thermal shutdown protection which shuts

off the switch to prevent damage to the part when a continuous over-current condition causes excessive

heating. When the switch current reaches the current limit, the parts operate in a constant-current mode

to prohibit excessive currents from causing damage. The ACE345E will not turn off after a current limit

fault, but will rather remain in the constant current mode indefinitely.

Features



Up to 1.5A Max Load current



Accurate Current-limit threshold: +/-5%



Programmable Current-limit : 75mA to 1.7A



Fast Over-Current Response



Reversed Current blocking



Thermal Shutdown, UVLO protection



Tiny SOT23-5 Package

Application



USB ports/Hubs



Hot Swaps



Cellphones



Tablet PC



Set Top Box



PC motherboard



Handheld Devices

Absolute Maximum Ratings

Parameter

Range

IN to GND

–0.3V to 6V

OUT, ILIM, EN to GND

–0.3V to VIN+0.3V

OUT to GND Current

Internally limited

Maximum Power Dissipation

0.67W

Operating Temperature Range

–40°C to 85°C

Storage Temperature Range

–55°C to 150°C

Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability.