EVALUATION KIT AVAILABLE -20V to +75V Input Range, MAX9918/MAX9919/MAX9920 Precision Uni-/Bidirectional, Current-Sense Amplifiers General Description Benefits and Features The MAX9918/MAX9919/MAX9920 are single-supply, Reduce Protective Clamping for High Inductive high-accuracy current-sense amplifiers with a high Kickback Voltage input common-mode range that extends from -20V to -20V to +75V Input Common-Mode Voltage Range +75V. These amplifiers are well suited for current Supports Wide Range of Precision AC and DC monitoring of inductive loads such as motors and Current Sensing Applications solenoids, where common-mode voltages can become Uni- or Bidirectional Current Sensing negative due to inductive kickback, reverse-battery 0.6% (max) Gain Accuracy Error conditions, or transient events. 400V (max) Input Offset Voltage The MAX9918/MAX9920 feature adjustable gain set by 120kHz, -3dB Bandwidth (MAX9919N) an external resistive-divider network. The MAX9919 Reference Input for Bidirectional OUT features fixed gains of 45V/V (MAX9919F) and 90V/V Rail-to-Rail Output (MAX9919N). The MAX9918/MAX9919/MAX9920 Saves Board Space operate as unidirectional amplifiers when V = GND REFIN 8-Pin SOIC Package and as bidirectional amplifiers when V = V /2. REFIN CC Single-Supply Operation (4.5V to 5.5V) The MAX9920 attenuates the input signal by a factor of 4 at the input level-shifting stage allowing the device to Ordering Information/ sense voltages up to 200mV (unidirectional operation) or 100mV (bidirectional operation). Selector Guide The MAX9918/MAX9919/MAX9920 operate with a V GAIN PIN- SENSE PART single 5V supply voltage, are fully specified over the (mV) (V/V) PACKAGE -40C to +125C automotive temperature range, and MAX9918ASA+ 50 Adjustable 8 SO-EP* are available in an 8-pin SOIC package. MAX9918ASA/V+ 50 Adjustable 8 SO-EP* Applications MAX9919FASA+ 50 45 8 SO-EP* H-Bridge Motor Current Sensing MAX9919FASA/V+ 50 45 8 SO-EP* Solenoid Current Sensing MAX9919NASA+ 50 90 8 SO-EP* Current Monitoring of Inductive Loads MAX9919NASA/V+ 50 90 8 SO-EP* High- and Low-Side Precision Current Sensing MAX9920ASA+ 200 Adjustable 8 SO-EP* Super-Capacitor Charge/Discharge Monitoring MAX9920ASA/V+ 200 Adjustable 8 SO-EP* Note: All devices operate over the -40C to +125C temperature Precision High-Voltage Current Monitoring range. +Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part. *EP = Exposed pad. Typical Operating Circuit V V CC CC V BATT MAX9918 OUT 2B 1A A ADC MAX9920 R SENSE R2 M FB RS+ INPUT STAGE R1 LEVEL SHIFTER RS- REFIN REF ADJUSTABLE GAIN C 2B 1B SHDN GND GND 19-5015 Rev 6 1/15-20V to +75V Input Range, MAX9918/MAX9919/MAX9920 Precision Uni-/Bidirectional, Current-Sense Amplifiers ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Output Short Circuit to V or GND...........................Continuous CC CC RS+, RS- to GND (V = 5V) ..................................-30V to +80V Continuous Current into Any Pin CC RS+, RS- to GND (V = 0V) .............-15V to +80V (15 minutes) (Not to exceed package power dissipation) ................20mA CC Differential Input Voltage (V - V ) Continuous Power Dissipation (T = +70C) RS+ RS- A (MAX9918/MAX9919).................................15V (Continuous) 8-Pin SO-EP (derate 24.4mW/C above +70C).....1951.2mW** Differential Input Voltage Junction Temperature......................................................+150C (V - V ) (MAX9920) .............................5V (Continuous) Storage Temperature Range .............................-65C to +150C RS+ RS- REFIN, FB, OUT to GND.............................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C CC SHDN to GND.........................................................-0.3V to +20V Soldering Temperature (reflow) .......................................+260C **As per JEDEC51 Standard (multilayer board). PACKAGE THERMAL CHARACTERISTICS (Note 1) SO-EP Junction-to-Ambient Thermal Resistance ( ) ...........41C/W JA 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 = 5V, V = V = +14V, V = (V - V ) = 0V, V = V = 0V, V = V /2, R = 100k for MAX9918, A = CC RS+ RS- SENSE RS+ RS- SHDN GND REFIN CC L V 90V/V, R2/R1 = 89k/1k for MAX9920, A = 20V/V, R2/R1 = 79k/1k T = -40C to +125C, unless otherwise noted. Typical val- V A ues are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS T = +25C 0.14 0.4 A V = V = RS+ RS- +14V, V REFIN T = -40C A 0.7 = 0V to +125C MAX9918 T = +25C 0.08 0.4 A V = V = RS+ RS- -2V, V = REFIN T = -40C A 1.3 0V to +125C T = +25C 0.18 0.4 A V = V = RS+ RS- +14V, V REFIN T = -40C A 0.9 = 0V to +125C Input Offset Voltage (Note 2) V MAX9919 mV OS T = +25C 0.11 0.4 A V = V = RS+ RS- -2V, V = REFIN T = -40C A 1.0 0V to +125C T = +25C 0.48 1.2 A V = V = RS+ RS- +14V, V REFIN T = -40C A 3.0 = 0V to +125C MAX9920 T = +25C 0.10 0.9 A V = V = RS+ RS- -2V, V = REFIN T = -40C A 3.5 0V to +125C www.maximintegrated.com Maxim Integrated 2