MAX9919FASA+T

产品概述

The MAX9919FASA+T from Maxim Integrated Products is a precision unidirectional/bidirectional current sense amplifier in 8 pin HSOIC package. This single supply, high accuracy current sense amplifier has high input common mode range that extends from -20V to +75V. It is well suited for current monitoring of inductive loads such as motors and solenoids where common mode voltages can become negative due to inductive kickback, reverse battery conditions or transient events. The MAX9919 has fixed gain of 45V/V. The device operates as unidirectional amplifier when VREFIN = GND and as bidirectional amplifier when VREFIN = VCC/2. It is used in high and low side precision current sensing, super capacitor charge/discharge monitoring, solenoid current sensing, H-bridge motor current sensing and precision high voltage current monitoring applications.

• Supply voltage range from 4.5V to 5.5V
• Automotive temperature range from -40°C to +125°C
• Small signal -3dB bandwidth of 250KHz (VSENSE = 50mV) and slew rate of 0.9V/µs
• Supports wide range of precision AC and DC current sensing applications
• Gain error of ±0.13% at TA = +25°C (VRS+ = VRS- =+14V, VREFIN = 0V)
• Input offset voltage of ±0.18mV at TA = +25°C (VRS+ = VRS- = +14V, VREFIN = 0V)
• Rail to rail output, reference input for bidirectional OUT
• CMRR of 96dB (20V <= VCM <= +75V) and PSRR of 103dB (4.5V <= VCC <= 5.5V)
• Input offset current of ±8µA and input bias current of ±175µA at TA = +25°C
• Automotive; Current Monitoring of Inductive Loads; H-Bridge Motor Current Sensing; High- and Low-Side Precision Current Sensing;

• Precision High-Voltage Current Monitoring; Solenoid Current Sensing; Super-Capacitor Charge/Discharge Monitoring

应用

传感与仪器, 电机驱动与控制