1.5A High Side Switch

OBSOLETE: For Information Purposes Only. Contact Analog Devices for Potential Replacement.

The LT1188 is a monolithic high side switch employing bipolar technology. The device is designed to operate in harsh environments such as those encountered in the automotive industry. The device incorporates an internal clamp diode to clamp the negative voltage spikes generated by inductive loads such as solenoids and is capable of withstanding load dumps of 60V on the supply pin while clamping such spikes. Standby current is only 500µA and ground pin current, when driving a 1A load, is only 5mA.

The device's input logic levels are designed to be compatible with standard TTL levels while drawing only 20µA in the on state. A status output is provided to inform the user of the condition of the output load as well as the switch. The status pin will change state for shorted as well as open loads and will also indicate when the device is above normal operating temperature. The device protects itself against short circuited loads by limiting output current and then shutting itself off after a specified time if the short remains. The device protects itself against over temperature by shutting itself off. Over temperature shutoff occurs at a temperature above where the status pin overtemp indication occurs, allowing the user time to recognize and possibly correct the problem before drive to the load is removed.

Applications

* Solenoid Driver

* Relay Driver

* Motor Driver

* 1.5A Bipolar Switch

* Controlled Output Slew Rate (2V/µs) to Limit R.F.I. Generation

* 60V Load Dump Capability with Inductive Kickback

* Internal Negative Voltage Clamp for Inductive Loads

* 500µA Standby Current

* Logic Input - TTL Levels