4 to 76V, bi-directional current sense amplifier

The LMP8480 and LMP8481 are precision

high-side current sense amplifiers that amplify a small differential voltage

developed across a current sense resistor in the presence of high input common-mode

voltages. These amplifiers are designed for bidirectional (LMP8481) or

unidirectional (LMP8480) current applications and accept input signals with

common-mode voltage range from 4V to 76V with a bandwidth of 270kHz. Because the

operating power supply range overlaps the input common-mode voltage range, the

LMP848x can be powered by the same voltage that is being monitored. This benefit

eliminates the need for an intermediate supply voltage to be routed to the point of

load where the current is being monitored, resulting in reduced component count and

board space.

The LMP848x family consists of fixed

gains of 20, 60, and 100 for applications that demand high accuracy over

temperature. The low-input offset voltage allows the use of smaller sense resistors

without sacrificing system error. The wide operating temperature range of –40°C to

125°C makes the LMP848x an ideal choice for automotive, telecommunications,

industrial, and consumer applications. The LMP8480 and LMP8481 are pin-for-pin

replacements for the MAX4080 and MAX4081, offering improved offset voltage, wider

reference adjust range and higher output drive capabilities. The LMP8480 and LMP8481

are available in a 8-pin VSSOP package.