High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator MAX9611/MAX9612
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High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator  MAX9611/MAX9612 - 1

________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 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

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High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator  MAX9611/MAX9612 - 3

High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator MAX9611/MAX9612 _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VCC = 3.3V, VRS+ = VRS- = +12V, VSENSE = (VRS+ - VRS-) = 0V, TA = -40NC to +125NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Common-Mode Rejection Ratio CMRR VRS- = 0V to 60V, TA = +25NC Gain = 8x, VSENSE = 50mV 106 120 dB Gain = 4x, VSENSE = 100mV 106 120 Gain = 1x, VSENSE =400mV 100 120 VRS- = 0V to...

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High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator  MAX9611/MAX9612 - 4

High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator MAX9611/MAX9612 4 _______________________________________________________________________________________ ELECTRICAL CHARACTERISTICS (continued) (VCC = 3.3V, VRS+ = VRS- = +12V, VSENSE = (VRS+ - VRS-) = 0V, TA = -40NC to +125NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS OUT VOLTAGE MEASUREMENT (VOUT) Full-Scale Input Voltage 57.3 V LSB Step Size LSB 14 mV Gain Error GE VRSCM =(VRS+ - VRS-)/2 TA = +25NC 0.8 6 % TA = -40NC to +125°C 7 Input Offset...

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High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator  MAX9611/MAX9612 - 5

High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator MAX9611/MAX9612 _______________________________________________________________________________________ 5 ELECTRICAL CHARACTERISTICS (continued) (VCC = 3.3V, VRS+ = VRS- = +12V, VSENSE = (VRS+ - VRS-) = 0V, TA = -40NC to +125NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2) Note 2: All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design. Note 3: VOS and gain error of current-sense amplifier extrapolated from from a two-point measurement made at VSENSE =...

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High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator  MAX9611/MAX9612 - 8

High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator MAX9611/MAX9612 8 _______________________________________________________________________________________ Typical Operating Characteristics (continued) (VCC = 3.3V, VCM = 12V, TA = +25NC, unless otherwise noted.) CMRR vs. FREQUENCY CSA ADC PATHMAX9611 toc15FREQUENCY (kHz)CMRR (dB)10010-120-100-80-60-40-200-14011000VCM = 12VVAC = 10VP-PCMRR vs. FREQUENCYANALOG OP-AMP PATHMAX9611 toc16FREQUENCY (kHz)CMRR (dB)1001010.1-115-110-105-100-95-90-85-80-75-70-1200.011000P-P NOISE (RS+/RS- TO OUT)MAX9611 toc17NOISE (...

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High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator  MAX9611/MAX9612 - 9

High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator MAX9611/MAX9612 _______________________________________________________________________________________ 9 Typical Operating Characteristics (continued) (VCC = 3.3V, VCM = 12V, TA = +25NC, unless otherwise noted.) HOT-SWAP OPERATION WITH p-CHANNEL FET MODE 000MAX9611 toc22VOLTAGE ( 5V/div)TIME (100ìs/div)VPULLUPVOUT (UNREGULATED)VOUT (REGULATED)ROUT = 8IWATCHDOG LATCH RETRY MODE 111MAX9611 toc23VOLTAGE ( 5V/div)TIME (400ìs/div)DTIM = 0, RTIM = 0 VSET = 600mVPULSE WIDTH < 1ms200mV/div5V/divVOUTVCSAINWATCHDOG LATCH RETRY...

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