MAX9919:-20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers

Current-Sense Amplifiers with Input Common Range that Extends Well Below Ground (-20V)

The MAX9918/MAX9919/MAX9920 are single-supply, high-accuracy current-sense amplifiers with a high input common-mode range that extends from -20V to +75V. These amplifiers are 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 MAX9918/MAX9920 feature adjustable gain set by an external resistive-divider network. The MAX9919 features fixed gains of 45V/V (MAX9919F) and 90V/V (MAX9919N). The MAX9918/MAX9919/MAX9920 operate as unidirectional amplifiers when VREFIN = GND and as bidirectional amplifiers when VREFIN = VCC/2. The MAX9920 attenuates the input signal by a factor of 4 at the input level-shifting stage allowing the device to sense voltages up to 200mV (unidirectional operation) or ±100mV (bidirectional operation). The MAX9918/MAX9919/MAX9920 operate with a single 5V supply voltage, are fully specified over the -40°C to +125°C automotive temperature range, and are available in an 8-pin SOIC package.

Key Features
  • Reduce Protective Clamping for High Inductive Kickback Voltage
    • -20V to +75V Input Common-Mode Voltage Range
  • Supports Wide Range of Precision AC and DC Current Sensing Applications
    • Uni- or Bidirectional Current Sensing
    • 0.6% (max) Gain Accuracy Error
    • 400µV (max) Input Offset Voltage
    • 120kHz, -3dB Bandwidth (MAX9919N)
    • Reference Input for Bidirectional OUT
    • Rail-to-Rail Output
  • Saves Board Space
    • 8-Pin SOIC Package
    • Single-Supply Operation (4.5V to 5.5V)
MAX9918, MAX9919, MAX9920: Typical Operating Circuit
MAX9918, MAX9919, MAX9920: Typical Operating Circuit
Applications/Uses
  • 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
DataSheet
titleDownload file
MAX9918-MAX9920 Data SheetMAX9918-MAX9920.pdf
Parametrics
Part NumberOutput FormatCMVR
(V)
CMVR
(V)
VCC
(V)
VCC
(V)
ICC
(µA)
Bi-Dir. Curr. SenseVSENSE_FS
(mV)
VOS @25°C
(µV)
GainGain Accuracy @25°C
(%)
BW
(kHz)
Comp-
arators
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxminmaxtyprecomm.maxmax@ -3dBSee Notes
MAX9918Voltage-20754.55.51000Yes50400Adj.0.6750-40 to +125SOIC(N)-EP/8$1.15 @1k
MAX99195040045 V/V
90 V/V
0.45120
250
SOIC(N)-EP/8$1.10 @1k
MAX99202001200Adj.1230SOIC(N)-EP/8$1.11 @1k
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • MAX4080:76V, High-Side, Current-Sense Amplifiers with Voltage Output
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX9919FASA+ActiveSOIC(N)-EP,;8 pin;30.9 mm²-40°C to +125°CLead Free
MAX9919FASA+TActiveSOIC(N)-EP,;8 pin;30.9 mm²-40°C to +125°CLead Free
MAX9919FASA/V+ActiveSOIC(N)-EP,;8 pin;30.9 mm²-40°C to +125°CLead Free
MAX9919FASA/V+TActiveSOIC(N)-EP,;8 pin;30.9 mm²-40°C to +125°CLead Free
MAX9919NASA+ActiveSOIC(N)-EP,;8 pin;30.9 mm²-40°C to +125°CLead Free
MAX9919NASA+TActiveSOIC(N)-EP,;8 pin;30.9 mm²-40°C to +125°CLead Free
MAX9919NASA/V+ActiveSOIC(N)-EP,;8 pin;30.9 mm²-40°C to +125°CLead Free
MAX9919NASA/V+TActiveSOIC(N)-EP,;8 pin;30.9 mm²-20°C to +85°CLead Free
MAX9918-MAX9920.pdf MAX9920
MAX9919.pdf MAX9919
MAX9918-MAX9920.pdf MAX9920