LMP8481 datasheet(17/29 Pages) TI

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LMP8480, LMP8481

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SNVS829C – MARCH 1999 – REVISED SEPTEMBER 2015

Feature Description (continued)

8.3.10 Maximum Output Voltage

The LMP8481 has an internal precision 14-V low-dropout regulator which limits the maximum amplifier output

swing to about 250 mV below VCC or 13.7 V (whichever is less). This effectively clamps the maximum output to

slightly less than 13.7 V even with a VCC greater than 14 V. See Typical Application With Resistive Divider for

more information.

8.4 Device Functional Modes

8.4.1 Unidirectional vs Bidirectional Operation

Unidirectional operation is where the load current only flows in one direction (VSENSE is always positive).

Application examples would be PA monitoring, non-inductive load monitoring and laser or LED drivers. This

allows the output zero reference to be true zero volts on the output. The LMP8480 is designed for unidirectional

applications where the setting of VREF is not required. See the Unidirectional Application With LMP8480 for

more details.

Bidirectional operation is where the load current can flow in both directions (VSENSE can be positive or negative).

Application examples would be battery-charging or regenerative motor monitoring. The LMP8481 is designed for

bidirectional applications and has a pair of VREF pins to allow the setting of the output zero reference level

(VREF). See the Unidirectional Application With LMP8480 section for more details.

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