ACT2103

Rev 2, 23-May-12

®

- 6 -

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Copyright © 2012 Active-Semi, Inc.

Secondary Over Current Protection

(SOCP)

In normal operation, ACT2103 high-side FET

current is protected by cycle-by-cycle current limit.

In some fault conditions, the input current may run

away. SOCP current limit is set 30% higher than

cycle-by-cycle current limit, and once SOCP is

triggered, ACT2103 goes into hiccup mode and

reduce the power dissipation significantly.

Enable Pin

The ACT2103 has an enable input EN for turning

the IC on or off. The EN pin contains a precision

2.5V comparator with 75mV hysteresis and a 1.3μA

pull-up current source. The comparator can be used

voltage higher than the normal UVLO value. If left

floating, the EN pin will be pulled up to roughly 5V

by the internal 1.3μA current source. It can be

driven from standard logic signals greater than

2.5V, or driven with open-drain logic to provide

digital on/off control.

Thermal Shutdown

The ACT2103 disables switching when its junction

temperature exceeds 160°C and resumes when the

temperature has dropped by 30°C.