EVALUATION KIT AVAILABLE MAX9934 High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing General Description Features The MAX9934 high-precision, low-voltage, high-side Input Offset Voltage: 10V (max) current-sense amplifier is ideal for both bidirectional Gain Error Less than 0.25% (charge/discharge) and unidirectional current measure- -0.1V to +5.5V Input Common-Mode Voltage ments in battery-powered portable and laptop devices. Range Input offset voltage (V ) is a low 10V (max) at +25C OS across the -0.1V to 5.5V input common-mode voltage Chip Select Allows Multiplexing Several MAX9934 range, and is independent of V . Its precision input CC Current Monitors to One ADC specification allows the use of very small sense volt- Current Output Allows R Selection OUT ages (typically 10mV full-scale) for minimally invasive for Gain Flexibility current sensing. Single Supply Operation: 2.5V to 3.6V The output of the MAX9934 is a current proportional to input V and is available in either 25A/mV or Two Gain Options: G of 25A/mV (MAX9934T) SENSE M 5A/mV gain options (G ) with gain accuracy better and 5A/mV (MAX9934F) M than 0.25% (max) at +25C. A chip select (CS) allows Bidirectional or Unidirectional Operation multiplexing of several MAX9934 current outputs to a Small, 6-Bump UCSP (1mm x 1.5mm x 0.6mm) single microcontroller ADC channel (see the Typical and 8-Pin MAX Packages Operating Circuit). CS is compatible with 1.8V and 3.3V logic systems. The MAX9934 is designed to operate from a 2.5V to Ordering Information 3.6V V supply, and draws just 120A (typ) quiescent CC current. When powered down (V = 0), RS+ and RS- PIN- TOP CC PART GAIN draw less than 0.1nA (typ) leakage current to reduce PACKAGE MARK battery load. The MAX9934 is robust and protected MAX9934FART+T 5A/mV 6 UCSP AAG from input faults of up to 6V input differential voltage MAX9934FAUA+T 5A/mV 8 MAX between RS+ and RS-. MAX9934FAUA/V+T 5A/mV 8 MAX AAG The MAX9934 is specified for operation over the -40C MAX9934TART+T 25A/mV 6 UCSP AAF to +125C temperature range and is available in an 8-pin MAX or a 6-bump UCSP (1mm x 1.5mm x MAX9934TAUA+T 25A/mV 8 MAX 0.6mm), making it ideal for space-sensitive applications. MAX9934TAUA/V+T 25A/mV 8 MAX AAF Note: All devices are specified over the -40C to +125C Applications extended temperature range. PDAs and Smartphones +Denotes a lead(Pb)-free/RoHS-compliant package. MP3 Players T = Tape and reel. Sensor Instrumentation Amplifiers Notebook PCs and Ultra-Mobile PCs Typical Operating Circuit Portable Current Monitoring V = 3.3V CC 0.1F I LOAD -0.1V V 5.5V CM V CC R SENSE MAX9934 RS- V TO ADC OUT OUT RS+ ROUT 1000pF 10k GND CS MAX is a registered trademark and UCSP is a trademark of FROM C CHIP SELECT Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-5011 Rev 3 11/12MAX9934 High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing ABSOLUTE MAXIMUM RATINGS RS+, RS- to GND......................................................-0.3V to +6V Junction-to-Case Thermal Resistance ( ) JC V to GND..............................................................-0.3V to +4V (Note 1) ......................................................................42C/W CC CS, OUT to GND (V = 0, or CS < V )..................-0.3V to +4V 6-Bump UCSP (derate multilayer 3.9mW/C CC IL OUT to GND (CS > V )................................-0.3V to V + 0.3V above +70C).............................................................308mW IH CC Differential Input Voltage (RS+ - RS-) ....................................6V Junction-to-Ambient Thermal Resistance ( ) JA Output Short-Circuit Current Duration (Note 1) ....................................................................260C/W OUT to GND or V ...............................................Continuous Operating Temperature Range .........................-40C to +125C CC Continuous Input Current into Any Terminal.....................20mA Junction Temperature......................................................+150C Continuous Power Dissipation (T = +70C) Storage Temperature Range .............................-65C to +160C A 8-Pin MAX (derate multilayer 4.8mW/C Lead Temperature (MAX only, soldering, 10s)..............+300C above +70C).............................................................388mW Soldering Temperature (reflow) .......................................+260C Junction-to-Ambient Thermal Resistance ( ) JA (Note 1) ....................................................................206C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. 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 = 3.3V, V = V = 3.0V, V = 0V, V = (V + V )/2, V = 3.3V, R = 10k to GND for unidirectional opera- CC RS+ RS- SENSE CM RS+ RS- CS OUT tion, R = 10k to V /2 for bidirectional operation. T = -40C to +125C, unless otherwise noted. Typical values are at T = OUT CC A A +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS T = +25C 10 A MAX9934T -40C T +125C 14 A Input Offset Voltage (Note 3) V V OS T = +25C 10 A MAX9934F -40C T +125C 20 A MAX9934T 60 Input Offset Voltage Drift (Note 3) V /dT nV/C OS MAX9934F 90 Common-Mode Input Voltage Range (Average of V and CMVR Guaranteed by CMRR2 -0.1 +5.5 V RS+ V ) (Note 3) RS- T = +25C 128 134 0 V V - A CM CC 0.2V (MAX9934F) -40C T +125C 112 A CMRR1 T = +25C 128 135 A 0 V V - CM CC 0.2V (MAX9934T) -40C T +125C 109 Common-Mode Rejection Ratio A dB (Note 3) T = +25C 119 125 -0.1 V 5.5V A CM (MAX9934F) -40C T +125C 104 A CMRR2 T = +25C 98 113 -0.1 V 5.5V A CM (MAX9934T) -40C T +125C 98 A 2 Maxim Integrated