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.
|Part Number||Output Format||CMVR |
|Bi-Dir. Curr. Sense||VSENSE_FS |
|VOS @25°C |
|Gain||Gain Accuracy @25°C |
|Oper. Temp. |
|min||max||min||max||typ||recomm.||max||max||@ -3dB||See Notes|
|MAX4172||Current||0||32||3||32||800||No||150||750||10 µA/mV||2||800||0||-40 to +85||$2.21 @1k|
|See All Current Sense Amplifiers (42)|
| Pricing Notes: |
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
|App Note||5095||DC Error Budget Calculator Simplifies Selection of Optimal Current-Sense Amplifiers|
|App Note||4485||Derive Simple High-Current Source from Lab Supply|
|App Note||3906||Creating a Bidirectional Current-Sense Amplifier from Two Unidirectional Current-Sense Amplifiers|
|App Note||3888||Performance of Current-Sense Amplifiers with Input Series Resistors|
|App Note||3536||Moving-Coil Meter Measures Low-Level Currents|
|App Note||3331||High-Side Current-Sense Amplifier Operates at High Voltage|
|App Note||2011||High-Side Positive Current Sensor Monitors Negative Supply|
|Reference Schematic||1867||Optocoupler Extends High-Side Current Sensor to 1kV|
|Tutorial||746||High-Side Current-Sense Measurement: Circuits and Principles|
|App Note||731||Overload Circuitry Protects Batteries and Power Supplies|
|App Note||268||Wireless-Modem Power for Hand-Held Devices|
|App Note||265||Circuit Breaker Handles Voltages to 76V|
|Reference Schematic||240||Overcurrent Monitor Operates up to 26V|