Features

• RS31211 - 3.3V eFuse

• RS31212 - 5V eFuse

• RS31309 – 2.97V to 18V input

• RS31311 - 12V eFuse

• Integrated 34mΩ Pass MOSFET

• Adjustable 0.5A to 4A current limit

• Adjustable output slew rate

• Enable with adjustable input UVLO threshold

• Fixed over-voltage camp: 3.8V for RS31211,

5.7V for RS31212 and 13.7V for RS31311

• Built-on over temperature protection

• Small 2x2mm WSON package

• RoHS compliant and Green

Applications

• Hot-swap, hot-plug

• PCI and PCIe cards

• Adapter powered devices

• HDD and SSD drivers

Description

The RS31211/212/309/311 devices are active

circuit protection devices with an integrated

MOSFET used to limit current and voltage to safe

levels during fault conditions.

The current limit level can be set with a resistor

between ILM and ground, and the typical current

limit accuracy is ±7.5%.

The device has over voltage protection feature

which limits the output voltage to a fixed level when

over voltage fault occurs.

To limit the inrush current during device turn-on, the

rising slew rate of output voltage can be set by a

capacitor between dVdt and ground.

The device also offers EN on/off control and input

UVLO features.

The device is available in WSON 8 pins, 2x2 mm

package.