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Part: MAX4069
Category:
Analog & Mixed-Signal Processing
Description: MAX4069, MAX4070, MAX4071, MAX4072 Bidirectional, High-Side, Current-sense Amplifiers With Reference
Company: Maxim Integrated Products
Datasheet: Download MAX4069 datasheet File size : 595 kB
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Datasheet text preview:
19-2423; Rev 2; 1/03
Bidirectional, High-Side, Current-Sense Amplifiers with Reference
General Description
The MAX4069MAX4072 low-cost, bidirectional, highside, current-sense amplifiers are ideal for monitoring battery charge and discharge currents in notebooks, cell phones, and other portable equipment. They feature up to 24V input common-mode voltage range, low 1 0 0 µ A supply current (which drops to only 10µA in shutdown), and a total output error of less than 1.5%. The wide 1.35V to 24V input common-mode range is independent of the supply voltage, ensuring that the current-sense feedback remains accurate even when connected to a battery pack in deep discharge. To achieve maximum flexibility, an external current-sense resistor is used along with a Gain Select pin to choose either 50V/V or 100V/V. A single output pin continuously monitors the transition from charge to discharge and a v o i d s the need for a separate polarity output. The M A X 4 0 7 0 contains an internal 2.5V reference. The charging current is represented by an output voltage from 2.5V to VCC, while discharge current is given from 2.5V to GND. The MAX4071 is similar, but with a reference voltage of 1.5V. The MAX4069 has an adjustable reference voltage, set by two external resistors. The MAX4072 has an input for an external reference. The MAX4069/MAX4071/MAX4072 operate from a 2.7V to 24V single supply. The MAX4070 operates from a 3.6V to 24V single supply. All devices are specified over the a u t o m o t i v e operating temperature range, -40°C to +125°C. The MAX4070/MAX4071/MAX4072 are available i n 8-pin µMAX and 8-pin thin QFN packages. The MAX4069 is available in a 10-pin µMAX package. o Total Output Error Less than 1.5% o Selectable Gain of 50V/V or 100V/V o Wide 1.35V to 24V Common-Mode Range Independent of Supply Voltage o 2.7V to 24V Single-Supply Operation o Internal Precision Reference Adjustable (MAX4069) 2.50V (MAX4070) 1.50V (MAX4071) o Low 100µA Supply Current o 10µA Supply Current in Shutdown o Available in Space-Saving Packages 8-Pin Thin QFN (MAX4070/MAX4071/MAX4072) 8-Pin µMAX (MAX4070/MAX4071MAX4072) 10-Pin µMAX (MAX4069)
Features
o Bidirectional, Compact, Current-Sense Solution
MAX4069MAX4072
Ordering Information
PART MAX4069AUB MAX4070AUA MAX4070ATA MAX4071AUA MAX4071ATA MAX4072AUA MAX4072ATA TEMP RANGE PIN-PACKAGE TOP MARK -- -- ABN -- ABO -- ABP
-40°C to +125°C 10 µMAX -40°C to +125°C 8 µMAX -40°C to +125°C 8 Thin QFN-EP* -40°C to +125°C 8 µMAX -40°C to +125°C 8 Thin QFN-EP* -40°C to +125°C 8 µMAX -40°C to +125°C 8 Thin QFN-EP*
Applications
Notebook Fuel Gauging Smart-Battery Packs/Chargers Motor Control Power-Management Systems Cell-Phone Battery-Current Monitoring
*EP = Exposed paddle.
Typical Operating Circuit
FROM BATTERY CHARGER RSENSE VBATT = 1.35V TO 24V RSRS+
Selector Guide
PART MAX4069 MAX4070 MAX4071 MAX4072 REFERENCE ADJUSTABLE 2.5V 1.5V EXTERNAL SUPPLY VOLTAGE RANGE (V) 2.7 to 24 3.6 to 24 2.7 to 24 2.7 to 24 COMMONMODE RANGE (V) 1.35 to 24 1.35 to 24 1.35 to 24 1.35 to 24
VCC = 3.6V TO 24V VCC
LOAD
MAX4070
GSEL OUT TO ADC
SHDN GND
REFOUT
2.5V
Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Bidirectional, High-Side, Current-Sense Amplifiers with Reference MAX4069MAX4072
ABSOLUTE MAXIMUM RATINGS
VCC, RS+, RS- to GND ..........-0.3V to +26V OUT to GND ...........-0.3V to Lesser of (VCC + 0.3V) or 15V Differential Input Voltage (VRS+ - VRS-) ......±0.3V GSEL, SHDN, REFOUT, REFIN and ADJ to GND....-0.3V to (VCC + 0.3V) OUT Short-Circuit Duration to GND or to Lesser of (VCC or 15V) ..Continuous REFOUT Short Circuit to VCC or GND......Continuous Current into Any Pin ..........±20mA Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 4.5 mW/°C above +70°C) ...362mW 8-Pin Thin QFN (derate 24.4mW/°C above +70°C) ...1951mW 10-Pin µMAX (derate 5.6 mW/°C above +70°C) .......444.4mW Operating Temperature Range .......-40°C to +125°C Junction Temperature ......+150°C Storage Temperature Range .....-65°C to +150°C Lead Temperature (soldering, 10s) .........+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VRS+ = VRS- = VCC = 2.7V to 24V, VSENSE = VRS+ - VRS- = 0V, IREFOUT = 0, V SHDN = VCC, VGSEL = GND, VREFIN = 2.5V (MAX4072), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and at VCC = VRS+ = 12V.) (Notes 1, 2)
PARAMETER Operating Voltage Range (Note 3) Input-Referred Offset Voltage (Note 5) Common-Mode Input Range Common-Mode Rejection Ratio Supply Current SYMBOL VCC MAX4070 V CC = V RS+ = VRS- = 12V TA = +25°C TA = -40°C to +85°C TA = TMIN to TMAX 1.35 100 120 100 9 µA 10 0.1 0 2.4 75 50 30 0.5 5 µA µA mV 250 CONDITIONS MAX4069/MAX4071/MAX4072 (Note 4) MIN 2.7 3.6 0.08 TYP MAX 24 24 0.25 0.8 1 24 V dB µA mV UNITS V
VOS CMVR CMRR ICC
Guaranteed by CMRR test 1.35V VRS+ = VRS- 24V, VCC = 12V VCC = VRS+ = VRS- = 24V, RL = open, TA = TMIN to TMAX VCC = VRS+ = VRS- = 5.5V, SHDN = GND, TA = +25°C VCC = VRS+ = VRS- = 24V, SHDN = GND VRS+ = VRS- = 24V, VCC = 0V VCC = VRS+ = VRS- = 24V Gain = 50V/V Gain = 100V/V
Shutdown Supply Current
ICC SHDN
Leakage Current Input Bias Current Recommended Full-Scale Sense Voltage (Note 6) IRS+, IRSV SENSE
2
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Bidirectional, High-Side, Current-Sense Amplifiers with Reference
ELECTRICAL CHARACTERISTICS (continued)
(VRS+ = VRS- = VCC = 2.7V to 24V, VSENSE = VRS+ - VRS- = 0V, IREFOUT = 0, V SHDN = VCC, VGSEL = GND, VREFIN = 2.5V (MAX4072), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and at VCC = VRS+ = 12V.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS VSENSE = 75mV, VCC = VRS+ = 12V, gain = 50 VSENSE = 50mV, VCC = VRS+ = 12V, gain = 100 MAX4069/MAX4070/ MAX4072: VSENSE = -35mV, VCC = VRS+ = 12V, gain = 50 MAX4069/MAX4070/ MAX4072: VSENSE = -17.5mV, VCC = VRS+ = 12V, gain = 100 MAX4071: VSENSE = -15mV, VCC = VRS+ = 12V, gain = 50 MAX4071: VSENSE = -7.5mV, VCC = VRS+ = 12V, gain = 100 VSENSE = 3mV, VCC = 12V, VRS+ = 12V TA = +25°C TA = -40°C to +85°C TA = TMIN to TMAX TA = +25°C TA = -40°C to +85°C TA = TMIN to TMAX TA = +25°C TA = -40°C to +85°C TA = TMIN to TMAX TA = +25°C TA = -40°C to +85°C TA = TMIN to TMAX TA = +25°C TA = -40°C to +85°C TA = TMIN to TMAX TA = +25°C TA = -40°C to +85°C TA = TMIN to TMAX TA = +25°C ±3 ±2.0 ±1.0 ±0.8 ±0.4 ±0.25 MIN TYP ±0.25 MAX ±1.0 ±1.5 ±2.0 ±1.0 ±1.5 ±2.5 ±1.0 ±2.0 ±3.0 ±2.0 ±4.0 ±6 ±2.5 ±4.0 ±6.0 ±5 ±10 ±15 % UNITS
MAX4069MAX4072
Total OUT Voltage Error (Note 7)
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3
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