Precision High Side Current Sense Amplifiers LT1999: High Voltage Bidirectional Current Sense Amplifier Buffered Output with 3 Gain Options: 10V/V, 20V/V, 50V/V AC CMRR > 80dB at 100kHz Gain Accuracy: 0.5% Max Input Common Mode Voltage Range: –5V to 80V Smooth Continuous Operation Over Entire Common Mode Range Low Power Shutdown <10µA –55°C to 150°C Operating Temperature Range 8-Lead MSOP and 8-Lead SO (Narrow) Packages n n n n n n n n The LT1999 accurately measures fast switching currents in H-bridge motor controls, switching power supplies, solenoids and battery chargers. It features a –5V to 80V input common mode voltage range, 2MHz bandwidth, less than 1.5mV offset voltage and 0.5% gain error over temperature. With more than 80dB common mode rejection at 100kHz, the LT1999 maintains outstanding accuracy even in the presence of large square wave input voltages. 0.0005 Up to 105V Input <10µV Offset IN+ ILOAD LTC6102 24.9 IN– LTC6102: Zero-Drift High Side Current Sense Amplifier Supply Range: 4V to 60V, 70V Maximum (LTC6102) 5V to 100V, 105V Maximum (LTC6102HV) ±10µV Input Offset Maximum ±50nV/°C Input Offset Drift Maximum Fast Response: 1µs Step Response PSRR 130dB Minimum Operating Temperature Range: –40°C to 125°C 8-Lead MSOP and 3mm x 3mm DFN Package n V– OUT VOUT = ILOAD / 10 (10-Bit Precision at 25A) 4.99K n n n n n Resolve µAmps from Amps Reduce RSENSE by 99% n The LTC®6102 zero-drift high side current sense amplifier has the precision to resolve microamps from amps of load current. Its outstanding accuracy can be used to attain high precision with a lower value sense resistor, resulting in less power loss and heat dissipation in the sense element. Part LT1999 LTC6102 LTC6101 LTC6102HV LTC6101HV LT6106 LT6107 LT6105 –55°C to 150°C VCM Incl. GND LTC6103 LTC6104 Key Features High Speed AC Current Direction Bidirectional Unidirectional Unidirectional Unidirectional Unidirectional Unidirectional Unidirectional Bidirectional Common Mode Voltage –5V to 80V 4V to 70V 5V to 105V 4V to 70V 5V to 105V 2.7V to 44V Response Time 1µs 1µs 1µs 3.5µs 3.5µs VOS Maximum 750µV 10µV 300µV 250µV VOS Drift 5µV/°C 25nV/°C 1µV/°C IBIAS Maximum 175µA 3nA 10, 20, 50V/V 80dB @ 100kHz Gain PSRR Minimum Zero-Drift VCM to 105V Lowest Cost Dual LT1787 LT1787HV LT6100 Gain Set Each Bidirectional Pin-Set Gain Direction Bidirectional Unidirectional 4V to 70V 4V to 70V 2.5V to 40V 2.5V to 65V 4.1V to 48V 3µs 1µs 1µs 10µs 40µs 250µV 300µV 450µV 450µV 100µV 300µV 1µV/°C 1µV/°C 0.5µV/°C 1.5µV/°C 1.5µV/°C 0.5µV/°C 0.5µV/°C 170nA 40nA 40nA 25µA 170nA 170nA 20nA 10µA R-Set R-Set R-Set R-Set R-Set R-Set R-Set 8V/V Pin-Set 120dB 118dB 106dB 106dB 100dB 110dB 110dB 120dB 105dB 2.7V to 44V –0.3V to 44V L, LT, LTC, LTM, Linear Technology, the Linear logo and Over-The-Top are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. I2C Temperature, Voltage and Current Monitor The LTC®2990, a temperature, voltage and current monitor for 3V to 5.5V systems, integrates a 14-bit ADC, 10ppm/°C reference and I2C interface to provide submillivolt voltage resolution, as well as accuracy of ±1°C internally and ±0.5°C remotely when making temperature measurements. Power Supply V1 I 2C V2 LTC2990 V3 V4 FPGA Temp. Diode I2C Current and Voltage Monitor The LTC4151 is a high side power monitor that operates over a wide voltage range of 7V to 80V. In default operation mode, the onboard 12-bit ADC continuously measures high side current, input voltage and an external voltage. Data is reported through the I2C interface when polled by a host. More Amplifiers for Current Sense Applications With over 300 amplifiers in our portfolio, we have the tools to solve the most difficult current sense challenges. Visit our website for a comprehensive application note and circuit collection covering low side, high side, unidirectional, bidirectional, negative supply, motor and inductive loads, and many other applications. Part Number Precision Op Amps for Low Side Current Sense + I – + Over-The-Top® Op Amps for High Side Current Sense I VS Range VIN Range (VCM) 75pA 2.7V to 12V 0V to (VS – 1.3V) LTC2054HV 0.5µV 0.6pA 2.7V to 12V 0V to (VS – 0.7V) LT1677 20µV 2nA 2.5V to 44V 0V to VS LTC6078 7µV 0.2pA 2.7V to 6V 0V to VS LTC6081 70µV 0.2pA 2.7V to 6V 0V to VS LT1218 25µV 30nA 2V to 36V 0V to VS LT1800 75µV 25nA 2V to 12.6V 0V to VS LT1806 100µV 1µA 1.8V to 12.6V 0V to VS LT6220 70µV 15nA 2.2V to 12.6V 0V to VS LTC6240 50µV 0.2pA 2.8V to 12V 0V to VS LT1494 – I IBIAS 0.5µV Part Number – LOAD Difference Amps for High or Low Side Current Sense VOS LTC2050HV + VOS IBIAS VS Range VIN Range (VCM) 150µV 250pA 2.1V to 36V 0V to 36V LT1636 50µV 5nA 2.6V to 44V 0V to 44V LT1637 100µV 20nA 1.8V to 44V 0V to 44V LT1672 150µV 250pA 2.1V to 36V 0V to 36V LT1782 400µV 8nA 2.2V to 18V 0V to 18V VOS IBIAS VS Range VIN Range (VCM) 2.4V to 36V –250V to 250V 2.7V to 36V –60V to 60V Part Number LT1990 900µV LT1991 15µV LT1995 1000µV LT1996 15µV 2.5nA 2.5nA 5V to 36V 0V to 36V 2.7V to 36V –60V to 60V Download our current sense circuit collection and application note at www.linear.com/currentsense www.linear.com/currentsense n 1-800-4-LINEAR 0311A