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 chargers ground path. Wide bandwidth and Supply Voltage 800kHz Bandwidth V = 100mV (1C) ground-sensing capability make the device suitable for SENSE closed-loop battery-charger and general-purpose current- 200kHz Bandwidth V = 6.25mV (C/16) SENSE source applications. The 0 to 32V input common-mode Minimizes Board Space Requirements range is independent of the supply voltage, which ensures MAX 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 PART TEMP RANGE PIN-PACKAGE current to be monitored. It has a current output that can MAX4172ESA+ -40C to +85C 8 SO be converted to a ground-referred voltage with a single MAX4172EUA+ -40C to +85C 8 MAX resistor, accommodating a wide range of battery voltages and currents. MAX4172GUA+ -40C to +105C 8 MAX 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 Typical Operating Circuit amplifier. The MAX4172 operates with a 3.0V to 32V supply voltage, and is available in a space-saving, 8-pin MAX or SO package. UNREGULATED R SENSE DC SUPPLY 50m Applications 3V TO 32V LOW-COST 0 TO 32V 2A SWITCHING Portable PCs: Notebooks/Subnotebooks/Palmtops V ANALOG OR REGULATOR SENSE Battery-Powered/Portable Equipment LOGIC SUPPLY Closed-Loop Battery Chargers/Current Sources 100k Smart-Battery Packs RS+ RS- Portable/Cellular Phones V+ PG Portable Test/Measurement Systems POWER GOOD LOAD/ MAX4172 Energy Management Systems BATTERY I = Pin Configuration OUT OUT V / 100 SENSE GND TOP VIEW FEEDBACK LOOP + V = 500mV/A OUT 8 RS+ 1 V+ R OUT 2 7 PG 1k RS- MAX4172 3 OUT N.C. 6 N.C. 4 5 GND LOW-COST BATTERY CHARGER/CURRENT SOURCE MAX/SO MAX is a registered trademark of Maxim Integrated Products, Inc. 19-1184 Rev 4 6/16MAX4172 Low-Cost, Precision, High-Side Current-Sense Amplifier Absolute Maximum Ratings V+, RS+, RS-, PG .................................................-0.3V to +36V Operating Temperature Range OUT .............................................................-0.3V to (V+ + 0.3V) MAX4172E A ................................................. -40C to +85C Differential Input Voltage, V - V ..........................700mV MAX4172G A ............................................... -40C to +105C RS+ RS- Current into Any Pin .........................................................50mA Storage Temperature Range ............................ -65C to +150C Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A SO (derate 5.88mW/C above +70C) ........................471mW Soldering Temperature (reflow) .......................................+260C MAX (derate 4.10mW/C above +70C) ...................330mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (V+ = +3V to +32V V , V = 0 to 32V T = T to T unless otherwise noted. Typical values are at V+ = +12V, RS+ RS- A MIN MAX V = 12V, T = +25C.) RS+ A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range V+ 3 32 V Input Voltage Range V 0 0 32 V RS- Supply Current I I = 0mA 0.8 1.6 mA V+ OUT MAX4172ESA 0.1 0.75 V+ = 12V, V = 12V RS+ Input Offset Voltage V MAX4172EUA 0.2 1.6 mV OS V 2.0V 4 RS+ V > 2.0V, I = 0mA 0 27 42.5 RS+ OUT Positive Input Bias Current I A RS+ V 2.0V, I = 0mA -325 +42.5 RS+ OUT V > 2.0V 0 50 85 Negative Input Bias RS+ I A RS- Current V 2.0V -650 85 RS+ Maximum V Voltage 150 175 mV SENSE MAX4172ESA 8.0 V = 6.25mV, V+ = 12V, SENSE Low-Level Current Error A V = 12V (Note 1) MAX4172EUA 15 RS+ MAX4172ESA, 20 T = -40C to 0C A MAX4172EUA, 50 T = -40C to 0C V = 100mV, V+ = 12V, A SENSE Output Current Error A V = 12V RS+ MAX4172ESA, 10 T = 0C to +105C A MAX4172EUA, 15 T = 0C to +105C A OUT Power-Supply I /V+ 3V V+ 32V, V > 2.0V 0.2 A/V OUT RS+ Rejection Ratio OUT Common-Mode I /V 2.0V < V < 32V 0.03 A/V OUT RS+ RS+ Rejection Ratio Maxim Integrated 2 www.maximintegrated.com