Specifications

Sensors
Current, light, and proximity sensing
www.digikey.com/maxim-industrial 79
Benefits
• Industrial-grade products withstand
very harsh operating environments
– -20V to +75V input common-mode
operating range provides reliability
while measuring the current of inductive
loads
– -40°C to +125°C automotive temperature
range
• Integrated functionality reduces system
cost and shortens design cycle
– Uni-/bidirectional current sensing
– Single 4.5V to 5.5V supply operation
eliminates the need for a second supply
– 400µV (max) input offset voltage (V
OS
)
– 0.6% (max) gain accuracy error
MAX9918/MAX9919/MAX9920
The MAX9918/MAX9919/MAX9920 current-sense amplifiers provide
uni-/bidirectional current sensing for very harsh environments where
the input common-mode range can become negative. The amplifiers
have a -20V to +75V common-mode operating range for measuring
the current of inductive loads. The combination of uni-/bidirectional
current measurement measures charge and discharge current into a
system. The 4.5V to 5.5V single-supply operation reduces cost of the
overall system.
Get precise measurements in very harsh operating environments
Typical operating circuit for the MAX9918/MAX9920 current-sense amplifiers for harsh operating environments.
M
φ2B
φ1B
ADC
REF
A
INPUT-STAGE
LEVEL SHIFTER
R
SENSE
V
BATT
ADJUSTABLE GAIN
V
CC
V
CC
RS+
RS-
FB
OUT
REFIN
R2
R1
GND
GND
SHDN
φ2B
φ1A
μC
MAX9918
MAX9920