Specifications

126 Control and Automation Solutions Guide
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
Precise Current Measurements Ensure Better
Motor Control
MAX9918/MAX9919/MAX9920
The MAX9918/MAX9919/MAX9920 are current-sense ampliers 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.
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
The MAX9918/MAX9920 current-sense amplifiers provide precise uni/bidirectional current sensing in very harsh environments.