Datasheet

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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 cur-

rent or to create a current source in a closed-loop system.

The comparator can be used to monitor fault events for

fast response.

An I

C-controlled 12-bit, 500sps analog-to-digital con-

verter (ADC) can be used to read the voltage across the

sense resistor (V

SENSE

), the input common-mode voltage

RSCM

), op-amp/comparator output (V

OUT

), op-amp/

comparator reference voltage (V

SET

), and internal die

temperature. The I

C 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 -40°C to

+125°C automotive temperature range, and are available

in a 3mm x 5mm, 10-pin µMAX

package.

Applications

● Hybrid Automotive Power Supplies

● Server Backplanes

● Base-Station PA Control

● Base-Station Feeder Cable Bias-T

● Telecom Cards

● Battery-Operated Equipment

Features

● 0V to +60V Input Common-Mode Voltage Range

● 2.7V to 5.5V Power-Supply Range, Compatible with

1.8V and 3.3V Logic

● 5μA Software Shutdown Current

● Integrated 12-Bit ADC

● 13μV Current-Sense ADC Resolution

● 500μV (max) Current-Sense ADC Input Offset

Voltage

● 0.5% (max) Current-Sense ADC Gain Error

● I

C Bus with 16 Addresses

● Small, 3mm x 5mm 10-Pin μMAX Package

● -40°C to +125°C Operating Temperature Range

Functional Diagrams appear at end of data sheet.

19-5543; Rev 4; 6/14

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Note: All devices operate over the -40°C to +125°C tempera-

ture range.

+Denotes a lead(Pb)-free/RoHS-compliant package.

PART OUTPUT PIN-PACKAGE

MAX9611AUB+ Noninverting 10 µMAX

MAX9612AUB+ Inverting 10 µMAX

MAX9611

MAX9612

µC

1.8V LOGIC

SCL

SDA

RS+ RS-

SCL

SDA

OUT

SET

GND

0.1

µF

0V TO 60V

LOAD

SENSE

MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with

12-Bit ADC and Op Amp/Comparator

Ordering Information/Selector Guide

Typical Application Circuit

EVALUATION KIT AVAILABLE

Summary of content (20 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator 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.
PAGE 2
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Absolute Maximum Ratings VCC to GND.............................................................-0.3V to +6V RS+, RS-, OUT to GND.........................................-0.3V to +65V Differential Input Voltage, RS+ - RS-...................................±65V All Other Pins to GND..............................................-0.3V to +6V OUT Short-Circuit to GND..........................................
PAGE 3
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Electrical Characteristics (continued) (VCC = 3.3V, VRS+ = VRS- = +12V, VSENSE = (VRS+ - VRS-) = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS VRS- = 0V to 60V, TA = +25°C Common-Mode Rejection Ratio CMRR VRS- = 0V to 60V, TA = -40°C to +125°C Power-Supply Rejection Ratio Full-Scale Sense Voltage PSRR FS VCC = 2.7V to 5.
PAGE 4
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Electrical Characteristics (continued) (VCC = 3.3V, VRS+ = VRS- = +12V, VSENSE = (VRS+ - VRS-) = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Electrical Characteristics (continued) (VCC = 3.3V, VRS+ = VRS- = +12V, VSENSE = (VRS+ - VRS-) = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER-SUPPLY CHARACTERISTICS Power-Supply Input Range VCC Quiescent Current Guaranteed by PSRR 2.
PAGE 6
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Typical Operating Characteristics (VCC = 3.3V, VCM = 12V, TA = +25°C, unless otherwise noted.) 500 TA = +85°C 300 VOS (µV) 200 100 10 TA = -40°C -100 5 300 240 180 10 20 30 40 ADC PATH GAIN = 8x 10 20 30 40 50 60 TOTAL OFFSET VOLTAGE vs. SUPPLY VOLTAGE 800 OP-AMP PATH 700 600 VOS (µV) 0 -50 -100 500 400 -150 300 -200 5 3.0 3.5 4.0 4.5 5.0 200 5.5 2.5 3.0 3.5 4.0 4.5 5.
PAGE 7
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Typical Operating Characteristics (continued) (VCC = 3.3V, VCM = 12V, TA = +25°C, unless otherwise noted.) 0.40 0.2 GAIN ERROR (%) GAIN ERROR (%) TA = +25°C 0.20 0 -0.20 TA = +85°C -0.40 TA = +125°C -0.60 0 10 20 30 40 -0.2 -0.4 50 -1.0 60 0.02 0.01 0 10 20 30 40 0 60 50 0 0.5 VCM (V) MAX9611 toc11 2.0 ICC (mA) 2.0 1.5 2.0 2.5 3.0 SUPPLY CURRENT vs. SUPPLY VOLTAGE 1.7 3.0 2.
PAGE 8
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Typical Operating Characteristics (continued) (VCC = 3.3V, VCM = 12V, TA = +25°C, unless otherwise noted.) CMRR vs. FREQUENCY CSA ADC PATH -20 -80 -60 -80 NOISE (5µV/div) -85 CMRR (dB) -90 -95 -100 -105 -100 -110 -120 -115 100 1000 -120 0.01 0.1 1 10 100 INTEGRAL NONLINEARITY vs. DIGITAL OUTPUT CODE (SET INPUT) 0.3 0.1 1.0 0.8 0.6 0.4 -0.3 0.2 DNL (LSB) -0.1 -0.5 -0.7 0 -0.2 -0.4 -0.9 -0.
PAGE 9
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Typical Operating Characteristics (continued) (VCC = 3.3V, VCM = 12V, TA = +25°C, unless otherwise noted.
PAGE 10
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Pin Configuration TOP VIEW OUT 1 + 10 VCC 9 A0 8 A1 4 7 SDA 5 6 SCL RS+ 2 RS- 3 SET GND MAX9611 MAX9612 µMAX Pin Description PIN NAME 1 OUT Internal Amplifier/Comparator Output 2 RS+ Positive Current-Sensing Input. Power side connects to external sense resistor. 3 RS- Negative Current-Sensing Input. Load side connects to external sense resistor.
PAGE 11
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Functional Diagrams RS+ VCC RS- CSA MAX9611 2.5x OUT OP AMP/ COMP 1x, 4x, 8x A0 DECODER MUX TEMP RS+ SET GND RS- VCC 12-BIT ADC I 2C REGISTERS A1 SCL SDA CSA MAX9612 2.5x OUT OP AMP/ COMP 1x, 4x, 8x A0 DECODER MUX TEMP SET 12-BIT ADC I 2C REGISTERS A1 SCL SDA GND NOTE: ANALOG PATH IN BOLD. www.maximintegrated.
PAGE 12
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Detailed Description nates input stage crossover distortion, typical in most rail-to-rail input current-sense amplifiers. Low input bias currents and low input offset currents allow a wide selection of input filters to be designed without degrading the accuracy of the current-sense amplifier. The MAX9611/MAX9612’s high-side, current-sense amplifiers operate over a wide 0V to 60V input commonmode voltage range.
PAGE 13
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator SET Voltage Measurement Watchdog/Latch/Retry Functionality The SET voltage serves as a reference voltage for the internal op amp or comparator around which a control loop can be designed. The low bias current for SET allows high-impedance resistor-dividers and current output DACs to be used, making it easy to interface without introducing additional errors.
PAGE 14
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator I2C Read Operation Slave Address A bus master initiates communication with a slave device by issuing a START (S) condition followed by a slave address. When idle, the MAX9611/MAX9612 continuously wait for a START condition followed by their slave address. When the MAX9611/MAX9612 recognize a slave address, it is ready to accept or send data.
PAGE 15
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Registers The two control registers are read/write registers used to configure the ADC for different modes of operation. The MAX9611/MAX9612 include five 12-bit data register banks and two 8-bit control registers. Table 3 lists all the registers, their corresponding POR values and their addresses. Table 3.
PAGE 16
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Table 5.
PAGE 17
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Power-On Reset The MAX9611/MAX9612 include power-on reset circuitry that ensures all registers reset to a known state on powerup. Once VCC goes above 2.4V, the POR circuit releases the registers for normal operation. Applications Information Inrush Current Limiter The MAX9611 can be used as an inrush current limiter for a number of applications as shown in Figure 3.
PAGE 18
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Base-Station PA Gain Control When the OUT open-dran transistor is off, the gate voltage of the PA FET is: While the MAX9611 is designed to control high-side pFETs, the MAX9612 can be similarly used to control low-side nFETs. For example, the MAX9612 can be used to control the DC bias point of power amplifier LDMOS or GaN nFETs in base-station applications.
PAGE 19
MAX9611/MAX9612 Chip Information PROCESS: BiCMOS www.maximintegrated.com High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 20
MAX9611/MAX9612 High-Side, Current-Sense Amplifiers with 12-Bit ADC and Op Amp/Comparator Revision History REVISION NUMBER REVISION DATE PAGES CHANGED DESCRIPTION 0 9/10 Initial release — 1 11/10 Updated text in Table 5 to add “comparator” to mode 000 for bits 7, 6, 5 16 2 1/11 Relaxed room temperature limits for 4x and 8x gains from 0.3mV to 0.