High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator MAX9611/MAX96120 pages

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High-Side, Current-Sense Amplifiers with
12-Bit ADC and Op Amp/Comparator
MAX9611/MAX9612
General Description
The MAX9611/MAX9612 are high-side current-sense
amplifiers with an integrated 12-bit ADC and a gain
block that can be configured either as an op amp or
comparator, making these devices ideal for a number of
industrial and automotive applications.
The high-side, current-sense amplifiers operate over a
wide 0V to 60V input common-mode voltage range. The
programmable full-scale voltage (440mV, 110mV, and
55mV) of these amplifiers offers wide dynamic range,
accurate current measurement, and application flexibility
in choosing sense resistor values. A choice of either an
internal op amp or a comparator is provided to the user.
The internal amplifier can be used to limit the inrush current
or to create a current source in a closed-loop system.
The comparator can be used to monitor fault events
for fast response.
An I2C controlled 12-bit, 500sps analog-to-digital converter
(ADC) can be used to read the voltage across the
sense resistor (VSENSE), the input common-mode voltage
(VRSCM), op-amp/comparator output (VOUT), op-amp/
comparator reference voltage (VSET), and internal die
temperature. The I2C bus is compatible with 1.8V and
3.3V logic, allowing modern microcontrollers to interface
to it.
The MAX9611 features a noninverting input-to-output
configuration while the MAX9612 features an inverting
input-to-output configuration.
The MAX9611/MAX9612 operate with a 2.7V to 5.5V
supply voltage range, are fully specified over the -40NC
to +125NC automotive temperature range, and are available
in a 3mm x 5mm, 10-pin FMAXM package.
Applications
Hybrid Automotive Power Supplies
Server Backplanes
Base-Station PA Control
Base-Station Feeder Cable Bias-T
Telecom Cards
Battery-Operated Equipment
Features
S 0V to +60V Input Common-Mode Voltage Range
S 2.7V to 5.5V Power-Supply Range, Compatible
with 1.8V and 3.3V Logic
S 5ìA Software Shutdown Current
S Integrated 12-Bit ADC
S 13ìV Current-Sense ADC Resolution
S 500ìV (max) Current-Sense ADC Input Offset
Voltage
S 0.5% (max) Current-Sense ADC Gain Error
S I2C Bus with 16 Addresses
S Small, 3mm x 5mm 10-Pin ìMAX Package
S -40NC to +125NC Operating Temperature Range
19-5543; Rev 2; 1/11
Note: All devices operate over the -40NC to +125NC temperature
range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Functional Diagrams appear at end of data sheet.
Ordering Information/
Selector Guide
FMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Application Circuit
EVALUATION KIT
AVAILABLE
PART OUTPUT PIN-PACKAGE
MAX9611AUB+ Noninverting 10 FMAX
MAX9612AUB+ Inverting 10 FMAX
MAX9611
MAX9612
VCC
ìC
1.8V LOGIC
SCL
SDA
RS+ RSA0
A1
SCL
SDA
OUT
SET
GND
0.1ìF
VIN
0V TO 60V
LOAD
RSENSE