NEATSwitch™: ST2042 & ST2052
Current limiting power distribution switches

Product Pages: ST2042 ST2052 ST’s ST2042 and ST2052 power switches provide Current Limiting protection in USB applications where heavy capacitive loads and short circuits are a major concern. These devices integrate 80mOhm N-Channel MOSFET high-side power switches for Power-Distribution systems which require multiple power switches in a single package.

The ST2042 and ST2052 belong to ST’s current expanding family of NEATSwitches (Nano-speed, Efficient Power, Application Specific and Tiny Package) and are especially suitable for USB ports, USB powered hubs and individual port protection in a dual-port topology. Application areas include:
USB Peripherals
Notebook PCs
USB powered hubs
General purpose power switching

80m Ohm N-channel high side MOSFET switch
500mA continuous current per channel
Independent thermal and short circuit protection
Overcurrent logic output flag
Operating voltage range of 2.7V to 5.5V
CMOS and TTL compatible enable inputs
2.5ms typical rise time
Undervoltage lockout
10µA maximum standby supply current
ESD protection

ST2042 and ST2052 incorporate two low resistance switches in a single package. Each switch is controlled by an individual logic enable signal and is capable of continuous current intake of up to 500mA. Should a short circuit occur, or should the output load exceed the current-limit threshold, the output current is limited to a safe level by switching to a constant current mode and switching the overcurrent logic output pin to a low state.
In situations where continuous heavy overloads and
short circuits increase power dissipation in the switch, thus increasing junction temperatures, a thermal protection circuit shuts down the switch, preventing any damage. Automatic recovery from a thermal shutdown condition occurs after the device has cooled sufficiently. Internal circuitry ensures the switch remains off until a valid input voltage is present.

ST2042 and ST2052 power distribution switches integrate a dual threshold thermal trip function to provide continuous switch operation in single fault conditions. When die temperature reaches 140°C, internal thermal sense circuitry identifies the power switch in overcurrent condition and switches it off, thus isolating the fault without interrupting operation of the adjacent power switch. An open-drain output is asserted (active low) when overheating or overcurrent occurs.

ST2042 and ST2052 are available in 8 pin small-outline SO-8 packages, capable of operating under harsh ambient conditions of -40°C to 85°C. The SO-8 packages are available in tube or tape and reel packaging.

P / N	Package
ST2042BD/BDR	SO-8 (Tube/Tape & Reel)
ST2052BD/BDR	SO-8 (Tube/Tape & Reel)