PRODUCT DESCRIPTION

The AMS2027 is a power distribution switch intended for application where heavy capacitive loads and short-circuits are likely to be encountered. The high-side switch is a 110mΩ N-channel MOSFET. The switch is controlled by a logic enable input compatible with 3V and 5V logic and is available in active-high or active-low enable. The internal charge pump, designed to control the power switch rise and fall time to minimize current surges during switching, also provides the gate drive. Requiring no external components the charge pump allows operation from supplies as low as 3.3V. When an overload or a short circuit is encountered the AMS2027 limits the output current to a safe level by switching into a constant-current mode and the overcurrent logic output error flag is set to a low. The power dissipation in the switch will be increased by continuous heavy overloads and short circuits; this will cause the junction temperature to rise. The thermal protection circuit shuts the power switch off to prevent damage. Once the device has cooled sufficiently, it will turn on automatic. An under voltage lock-out is provided to insure that the power switch is in the Off state at start-up.

The AMS2027 is offered in the 8 lead SOIC package and the 8 lead PDIP package and is rated operational over a -40°C to 85°C temperature range.

FEATURES

• 110mΩ Typical (5V Input) High Side MOSFET Switch

• Short Circuit Protection

• Logic Overcurrent Output Error Flag

• Logic Undervoltage Output Error Flag

• Logic Overheat Output Error Flag

• Enable Input Compatible With 3V and 5V Logic

• Controlled Rise and Fall Times Limit Current Surges and Minimize EMI

• Undervoltage Lock-Out Guarantees the Switch is Off At Start-up

• 100µA Maximum On-State Supply Current

• Available Active-High or Active-Low Enable

• Available in Space Saving 8 lead SOIC and 8 Lead PDIP

APPLICATIONS

• USB Power Management

• Hot Plug-In Power Supplies

• Battery-Charger Circuits