GENERAL DESCRIPTION

The SGM40642 is a smart low voltage load switch with

a full suite of protective features that can protect the

source, device, and the load against a variety of fault

conditions. This eFuse device is suitable for 2.5V to 5V

loads and provides accurate and adjustable current

limiting (700mA to 2.9A) and over-voltage clamping

(5.4V TYP). It can deliver 2.5A continuous current to

the load and its input tolerates up to 20V over-voltage.

In over-voltage conditions, the internal switch is turned

off to keep the load disconnected with the SGM40642.

If the source voltage is higher than 5.4V but lower than

7.6V, the output will be clamped to 5.4V to protect the

load. If the VIN voltage exceeds 7.6V, the load will be

disconnected to prevent damage.

The SGM40642 has an internal 54mΩ (TYP) power

switch with current limit capability. This limit is

programmable with a single external resistor (RILIM). A

persistent overload condition usually results in thermal

shutdown and may cause cyclic ON and OFF periods

to protect the device.

The SGM40642 is available in a Green TDFN-2×2-6AL

package and can operate over the -40℃ to +125℃

ambient temperature range.

FEATURES

● 2.5V to 6.5V Operation

● 54mΩ (TYP) Internal Switch (High-side MOSFET)

● Up to 2.5A Continuous Load Current

● Up to 20V Input Over-Voltage Tolerance

● Output Shutoff at 7.6V (TYP) Input Over-Voltage

● 100ns Over-Voltage Lockout (OVLO) Response

● 3.5μs Short-Circuit Response

● Reverse Current Blocking while Disabled

● Built-In Soft-Start

● Pin-to-Pin Compatible with SGM2553

● -40℃ to +125℃ Operating Temperature Range

● Available in a Green TDFN-2×2-6AL Package

APPLICATIONS

USB Power Switches

USB Slave Devices

Smart Phones/Cell Phones

3G, 4G Wireless Data-Cards

Solid State Drives (SSD)

3V or 5V Adapter Powered Devices