LT1970CFE

FeaTures

±500mA Minimum Output Current

Independent Adjustment of Source and Sink Current Limits

2% Current Limit Accuracy

Operates with Single or Split Supplies

Shutdown/Enable Control Input

Open Collector Status Flags: Sink Current Limit Source Current Limit Thermal Shutdown

Fail Safe Current Limit and Thermal Shutdown

1.6V/µs Slew Rate

3.6MHz Gain Bandwidth Product

Fast Current Limit Response: 2MHz Bandwidth

Specified Temperature Range: –40°C to 85°C

Available in a 20-Lead TSSOP Package

applicaTions

Automatic Test Equipment

Laboratory Power Supplies

Motor Drivers

Thermoelectric Cooler Driver

DescripTion

The LT®1970 is a ±500mA power op amp with precise externally controlled current limiting. Separate control voltages program the sourcing and sinking current limit sense thresholds with 2% accuracy. Output current may be boosted by adding external power transistors.

The circuit operates with single or split power supplies from 5V to 36V total supply voltage. In normal operation, the input stage supplies and the output stage supplies are connected (VCC to V+ and VEE to V–). To reduce power dissipation it is possible to power the output stage (V+, V–) from independent, lower voltage rails. The amplifier is unity-gain stable with a 3.6MHz gain bandwidth product and slews at 1.6V/µs. The current limit circuits operate with a 2MHz response between the VCSRC or VCSNK control inputs and the amplifier output.

Open collector status flags signal current limit circuit activation, as well as thermal shutdown of the amplifier. An enable logic input puts the amplifier into a low power, high impedance output state when pulled low. Thermal shutdown and a ±800mA fixed current limit protect the chip under fault conditions.

The LT1970 is packaged in a 20-lead TSSOP package with a thermally conductive copper bottom plate to facilitate heat sinking.

Information

Drawing

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