LMP8480 - 76V, High-Side, High-Speed, Voltage Output Current Sensing Amplifier

The LMP8480 and LMP8481 are precision high-side current sense amplifiers that amplify asmall differential voltage developed across a current sense resistor in the presence of high inputcommon-mode voltages. These amplifiers are designed for bidirectional (LMP8481) or unidirectional(LMP8480) current applications and accept input signals with common-mode voltage range from 4 V to76 V with a bandwidth of 270 kHz. Because the operating power supply range overlaps the inputcommon-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 ofload where the current is being monitored, resulting in reduced component count and boardspace.

The LMP848x family consists of fixed gains of 20, 60, and 100 for applications thatdemand high accuracy over temperature. The low-input offset voltage allows the use of smaller senseresistors without sacrificing system error. The wide operating temperature range of –40°C to 125°Cmakes the LMP848x an ideal choice for automotive, telecommunications, industrial, and consumerapplications. 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 drivecapabilities. The LMP8480 and LMP8481 are available in a 8-pin VSSOP package.

• Typical Values: T_A = 25°C
• Bidirectional or Unidirectional Sensing
• Common Mode Voltage Range: 4.0 V to 76 V
• Supply Voltage Range: 4.5 V to 76 V
• Fixed Gains: 20, 60, and 100 V/V
• Gain Accuracy: ±0.1%
• Offset: ±80 µV
• Bandwidth (–3 dB): 270 kHz
• Quiescent Current: < 100 µA
• Buffered High-Current Output: > 5 mA
• Input Bias Current: 7 µA
• PSRR (DC): 122 dB
• CMRR (DC): 124 dB
• Temperature Range: –40°C to 125°C

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