MAX4172
Low-Cost, Precision, High-Side Current-Sense Amplifier
Low-cost, Precision Current Monitoring For Portable Battery-Powered Applications
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Key Features
Applications/Uses
| 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 |
Simplified Block Diagram
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Parameters
| 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.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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