Specifications

Motor Control
Monitoring and measuring current for optimal motor control
98 Maxim Industrial Solutions
Benefits
• Provide reliable operation in harsh
motor-control environments
– 400µV (max) input offset voltage (V
OS
)
– -20V to +75V common-mode voltage
range provides reliability for 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-supply operation (4.5V to 5.5V)
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 are current-sense amplifiers with
a -20V to +75V input range. The devices provide unidirectional/
bidirectional current sensing in very harsh environments where the
input common-mode range can become negative. Uni-/bidirectional
current sensing measures charge and discharge current in a
system. The single-supply operation shortens the design time and
reduces the cost of the overall system.
Precise current measurements ensure better motor control
The MAX9918/MAX9920 current-sense amplifiers provide precise uni-/bidirectional current sensing in very harsh 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