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MAX4172
Low-Cost, Precision, High-Side Current-Sense Amplifier

Low-cost, Precision Current Monitoring For Portable Battery-Powered Applications


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 96kB)
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Description
The MAX4172 is a low-cost, precision, high-side current-sense amplifier for portable PCs, telephones, and other systems where battery/DC power-line monitoring is critical. High-side power-line monitoring is especially useful in battery-powered systems, since it does not interfere with the battery charger's ground path. Wide bandwidth and ground-sensing capability make the MAX4172 suitable for closed-loop battery-charger and general-purpose current-source applications. The 0V to 32V input common-mode range is independent of the supply voltage, which ensures that current-sense feedback remains viable, even when connected to a battery in deep discharge.

To provide a high level of flexibility, the MAX4172 functions with an external sense resistor to set the range of load current to be monitored. It has a current output that can be converted to a ground-referred voltage with a single resistor, accommodating a wide range of battery voltages and currents.

An open-collector power-good output (active-low PG) indicates when the supply voltage reaches an adequate level to guarantee proper operation of the current-sense amplifier. The MAX4172 operates with a 3.0V to 32V supply voltage, and is available in a space-saving, 8-pin µMAX® or SO package.

Key Features   Applications/Uses
  • Low-Cost, Precision, High-Side Current-Sense Amplifier
  • ±0.5% Typical Full-Scale Accuracy Over Temperature
  • 3V to 32V Supply Operation
  • 0V to 32V Input RangeµIndependent of Supply Voltage
  • 800kHz Bandwidth [VSENSE = 100mV (1C)]
    200kHz Bandwidth [VSENSE = 6.25mV (C/16)]
  • Available in Space-Saving µMAX and SO Packages

 
  		• Battery-Powered Applications
  		• Closed-Loop Battery Chargers/Current Sources
  		• Energy Management
  		• Portable PCs: Notebooks, Subnotebooks, Palmtops
  		• Portable Test/Measurement Systems
  		• Portable/Cellular Phones
  		• Smart Battery Packs/Chargers

    Key Specifications:  Current Sense Amplifiers
    Part Number CMVR
    (V)    		 CMVR
    (V)    		 VCC
    (V)    		 VCC
    (V)    		 ICC
    (µA)    		 Bi-Dir. Curr. Sense VSENSE_FS
    (mV)    		 VOS @25°C
    (µV)    		 Gain Gain Accuracy @25°C
    (%)    		 BW
    (kHz)    		 Comp-
    arators    		 Package/Pins Oper. Temp.
    (°C)    		 Price
    min max min max typ recomm. max max @ -3dB See Notes
    MAX4172  0 32 3 32 800 No 150 750 10 µA/mV 2 800 0
    µMAX/8
    SOIC(N)/8
    		 -40 to +85 $1.45 @1k
    See All Current Sense Amplifiers (26)

    Diagram
    MAX4172: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 240: Overcurrent Monitor Operates up to 26V - MAX4172
  		• Application Note 265: Circuit Breaker Handles Voltages to 76V - MAX4172
  		• Application Note 268: Wireless-Modem Power for Hand-Held Devices - MAX4172
  		• Application Note 731: Overload Circuitry Protects Batteries and Power Supplies - MAX4172
  		• Application Note 746: High-Side Current-Sense Measurement: Circuits and Principles - MAX4172
  		• Application Note 1867: Optocoupler Extends High-Side Current Sensor to 1kV - MAX4172
  		• Application Note 2011: High-Side Positive Current Sensor Monitors Negative Supply - MAX4172
  		• Application Note 3331: High-Side Current-Sense Amplifier Operates at High Voltage - MAX4172
  		• Application Note 3536: Moving-Coil Meter Measures Low-Level Currents - MAX4172
  		• Application Note 3888: Performance of Current-Sense Amplifiers with Input Series Resistors - MAX4172
  		• Application Note 3906: Creating a Bidirectional Current-Sense Amplifier from Two Unidirectional Current-Sense Amplifiers - MAX4172

    Design Guides
  		• Amplifiers and Sensors (PDF)
  		• Video (PDF)

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-8 of 8

    MAX4172 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4172ESA  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4172ESA-T    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4172ESA+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4172ESA+T    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4172EUA  
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4172EUA-T    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4172EUA+  
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4172EUA+T    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    Related Products
    MAX4373, MAX4374, MAX4375 Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs
    MAX4372F, MAX4372H, MAX4372T Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output
    MAX4069, MAX4070, MAX4071, MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference
    MAX4173, MAX4173F, MAX4173H, MAX4173T Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier

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    Document Ref.: 19-1184; Rev 0; 1996-12-01
    This page last modified: 2007-05-31


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