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

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

Product Details

Key Features

Applications/Uses

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 150
VOS @25°C (µV) (max) 750
Output Format Current
CMVR (V) (min) 0
CMVR (V) (max) 32
VCC (V) (min) 3
VCC (V) (max) 32
ICC (µA) (typ) 800
Bi-Dir. Curr. Sense No
Gain 10 µA/mV
Gain Accuracy @25°C (%) (max) 2
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
2.32
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Simplified Block Diagram

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Parameters

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 150
VOS @25°C (µV) (max) 750
Output Format Current
CMVR (V) (min) 0
CMVR (V) (max) 32
VCC (V) (min) 3
VCC (V) (max) 32
ICC (µA) (typ) 800
Bi-Dir. Curr. Sense No
Gain 10 µA/mV
Gain Accuracy @25°C (%) (max) 2
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
2.32

Key Features

  • Ideal for High-Side Monitoring
    • 3V to 32V Supply Operation
    • ±0.5% Typical Full-Scale Accuracy Over Temperature
    • High Accuracy +2V to +32V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage
    • 800kHz Bandwidth [VSENSE = 100mV (1C)]
    • 200kHz Bandwidth [VSENSE = 6.25mV (C/16)]
  • Minimizes Board Space Requirements
    • µMAX and SO Packages

Applications/Uses

  • 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

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 0 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.

Simplified Block Diagram

MAX4172: Functional Diagram MAX4172: Functional Diagram Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .