EVALUATION KIT AVAILABLE MAX9938 nanoPower, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier General Description Features The MAX9938 high-side current-sense amplifier offers Ultra-Low Supply Current of 1A (max) precision accuracy specifications of V less than 500V OS Low 500V (max) Input Offset Voltage (max) and gain error less than 0.5% (max). Quiescent Low < 0.5% (max) Gain Error supply current is an ultra-low 1A. The MAX9938 fits in a tiny, 1mm x 1mm UCSP package size or a 5-pin Input Common Mode: +1.6V to +28V SOT23 package, making the part ideal for applications in Voltage Output notebook computers, cell phones, PDAs, and all battery- Four Gain Versions Available operated portable devices where accuracy, low quiescent +25V/V (MAX9938T) current, and small size are critical. 50V/V (MAX9938F) The MAX9938 features an input common-mode voltage 100V/V (MAX9938H) range from 1.6V to 28V. These current-sense ampli- 200V/V (MAX9938W) fiers have a voltage output and are offered in four gain Tiny 1mm x 1mm x 0.6mm, 4-Bump UCSP, 5-Pin versions: 25V/V (MAX9938T), 50V/V (MAX9938F), SOT23, or 2mm x 2mm x 0.8mm, 6-Pin DFN 100V/V (MAX9938H), and 200V/V (MAX9938W). Packages The four gain selections offer flexibility in the choice of Ordering Information the external current-sense resistor. The very low 500V (max) input offset voltage allows small 25mV to 50mV PIN- GAIN TOP PART full-scale V voltage for very low voltage drop at SENSE PACKAGE (V/V) MARK full-current measurement. MAX9938TEBS+G45 4 UCSP 25 +AGD The MAX9938 is offered in tiny 4-bump, UCSP (1mm x MAX9938FEBS+G45 4 UCSP 50 +AGE 1mm x 0.6mm footprint), 5-pin SOT23, and 6-pin DFN MAX9938HEBS+G45 4 UCSP 100 +AGF (2mm x 2mm x 0.8mm) packages specified for operation MAX9938WEBS+G45 4 UCSP 200 +AGI over the -40C to +85C extended temperature range. MAX9938TEUK+ 5 SOT23 25 +AFFB Applications MAX9938FEUK+ 5 SOT23 50 +AFFC Cell Phones MAX9938HEUK+ 5 SOT23 100 +AFFD PDAs MAX9938WEUK+ 5 SOT23 200 +AFGZ Power Management Systems MAX9938FELT+ 6 DFN 50 +ACM Portable/Battery-Powered Systems Notebook Computers +Denotes a lead(Pb)-free/RoHS-compliant package. G45 indicates protective die coating. Note: All devices are specified over the -40C to +85C extended temperature range. UCSP is a trademark of Maxim Integrated Products, Inc. Pin Configurations TOP VIEW TOP VIEW RS+ RS- (BUMPS ON BOTTOM) (PADS ON BOTTOM) 5 4 RS+ A1 A2 RS- 6 RS- 1 OUT MAX9938T MAX9938T MAX9938F MAX9938F MAX9938H MAX9938H N.C. MAX9938FELT 5 N.C. 2 MAX9938W MAX9938W GND B1 B2 OUT RS+ 3 4 GND 1 2 3 UCSP GND GND OUT DFN SOT23 DRAWINGS NOT TO SCALE 19-4110 Rev 7 4/17MAX9938 nanoPower, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier Absolute Maximum Ratings RS+, RS- to GND ..................................................-0.3V to +30V Operating Temperature Range ........................... -40C to +85C OUT to GND ............................................................-0.3V to +6V Junction Temperature ......................................................+150C RS+ to RS- ..........................................................................30V Storage Temperature Range ............................ -65C to +150C Short-Circuit Duration: OUT to GND .........................Continuous Lead Temperature (excluding UCSP, soldering, 10s) .....+300C Continuous Input Current (Any Pin) .................................20mA Soldering Temperature (reflow) .......................................+260C Continuous Power Dissipation (T = +70C) A 4-Bump UCSP (derate 3.0mW/C above +70C) ........238mW 5-Pin SOT23 (derate 3.9mW/C above +70C) ..........312mW 6-Pin DFN (derate 4.5mW/C above +70C) ............358mW 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 = V = 3.6V, V = (V - V ) = 0V, T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) RS+ RS- SENSE RS+ RS- A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V = 5V, T = +25C 0.5 0.85 RS+ A V = 5V, -40C < T < +85C 1.1 RS+ A Supply Current (Note 2) I A CC V = 28V, T = +25C 1.1 1.8 RS+ A V = 28V, -40C < T < +85C 2.5 RS+ A Common-Mode Input Range V Guaranteed by CMRR , -40C < T < +85C 1.6 28 V CM A Common-Mode Rejection Ratio CMRR 1.6V < V < 28V, -40C < T < +85C 94 130 dB RS+ A T = +25C 100 500 A Input Offset Voltage (Note 3) V V OS -40C < T < +85C 600 A MAX9938T 25 MAX9938F 50 Gain G V/V MAX9938H 100 MAX9938W 200 T = +25C 0.1 0.5 MAX9938T/MAX9938F/ A MAX9938H -40C < T < +85C 0.6 A Gain Error (Note 4) GE % T = +25C 0.1 0.7 A MAX9938W -40C < T < +85C 0.8 A MAX9938T/F/H 7.0 10 13.2 Output Resistance R (Note 5) k OUT MAX9938W 14.0 20 26.4 Gain = 25 1.5 15 Gain = 50 3 30 OUT Low Voltage V mV OL Gain = 100 6 60 Gain = 200 12 120 OUT High Voltage V V = V - V (Note 6) 0.1 0.2 V OH OH RS- OUT V = 50mV, gain = 25 125 V SENSE Small-Signal Bandwidth V = 50mV, gain = 50 60 SENSE BW V = 50mV, gain = 100 30 kHz SENSE (Note 5) V = 50mV, gain = 200 15 SENSE Output Settling Time t 1% final value, V = 50mV 100 s S SENSE Maxim Integrated 2 www.maximintegrated.com