Datasheet MAX4172 (Maxim)

MAX4172 Low-Cost, Precision, High-Side Current-Sense Amplifier General Description Benefits and Features
The MAX4172 is a low-cost, precision, high-side current- ● Ideal for High-Side Monitoring sense amplifier for portable PCs, telephones, and other • 3V to 32V Supply Operation systems where battery/DC power-line monitoring is critical. • ±0.5% Typical Full-Scale Accuracy Over Temperature High-side power-line monitoring is especially useful in • High Accuracy +2V to +32V Common-Mode battery-powered systems, since it does not interfere with Range, Functional Down to 0V, Independent of the battery charger’s ground path. Wide bandwidth and Supply Voltage ground-sensing capability make the device suitable for • 800kHz Bandwidth [VSENSE = 100mV (1C)] closed-loop battery-charger and general-purpose current- • 200kHz Bandwidth [VSENSE = 6.25mV (C/16)] source applications. The 0 to 32V input common-mode ● Minimizes Board Space Requirements range is independent of the supply voltage, which ensures • μMAX and SO Packages 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
Ordering Information
with an external sense resistor to set the range of load current to be monitored. It has a current output that can
PART TEMP RANGE PIN-PACKAGE
be converted to a ground-referred voltage with a single MAX4172ESA+ -40°C to +85°C 8 SO resistor, accommodating a wide range of battery voltages MAX4172EUA+ -40°C to +85°C 8 μMAX and currents. MAX4172GUA+ -40°C to +105°C 8 µMAX An open-collector power-good output (PG) indicates +Denotes a lead(Pb)-free/RoHS-compliant package. 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
Typical Operating Circuit
supply voltage, and is available in a space-saving, 8-pin μMAX® or SO package. UNREGULATED
Applications
RSENSE DC SUPPLY 50mΩ 3V TO 32V LOW-COST 0 TO 32V 2A ● Portable PCs: Notebooks/Subnotebooks/Palmtops SWITCHING REGULATOR VSENSE ANALOG OR ● Battery-Powered/Portable Equipment LOGIC SUPPLY ● Closed-Loop Battery Chargers/Current Sources ● Smart-Battery Packs 100kΩ RS+ RS- ● Portable/Cellular Phones V+ ● Portable Test/Measurement Systems PG ● Energy Management Systems
MAX4172
POWER GOOD LOAD/ BATTERY
Pin Configuration
OUT IOUT = VSENSE / 100Ω GND TOP VIEW FEEDBACK LOOP
+
VOUT = 500mV/A RS+ 1 8 V+ ROUT RS- 2 7 PG 1kΩ
MAX4172
N.C. 3 6 OUT N.C. 4 5 GND
LOW-COST BATTERY CHARGER/CURRENT SOURCE µMAX/SO
μMAX is a registered trademark of Maxim Integrated Products, Inc. 19-1184; Rev 4; 6/16