Features and Benefits
- Supply Range: 5V to 100V
- Low Offset Voltage: ±500µV (Maximum)
- 1µs Response Time
- Gain Configurable with 2 Resistors
- Low Input Bias Current: 170nA (Maximum)
- PSRR: 118dB (Minimum)
- Low Supply Current: 250µA
- Voltage Sense Range: 0V to 100V
- Precision 1MΩ Resistor Divider
- Low Total Gain Error: ±0.15% (Maximum)
- Supply Voltage Range: 2.7V to 5.5V
- Low Supply Current: 57µA
- Operating Temperature Range: –40°C to 125°C
The LTC6115 is a versatile combination of a high voltage, high side current sense amplifier and a voltage sense amplifier. Design flexibility is provided by the excellent device characteristics: ±500µV maximum offset voltage for current sense and maximum ±0.15% voltage sense total gain error.
The current sensing part of the LTC6115 monitors current by sensing the voltage across an external sense resistor. The sensed voltage is converted to an output current which can then be translated to a voltage by an external resistor, ROUT. Due to its fast response, it is a perfect choice for load current warning and shut-off protection control.
The LTC6115 also includes an internal 1MΩ resistor divider and a precision voltage amplifier for accurate voltage monitoring. The resistor attenuation of 40 enables sensing of up to 100V on the VIN pin, making it suitable for precision high voltage monitoring in telecommunications, industrial and automotive applications. The full-scale output voltage can be configured by external gain resistors to maximize use of the amplifier’s rail-to-rail output. The LTC6115 is available in a 12-lead MSOP package.Applications
- Current Shunt Measurement
- Battery Monitoring
- Power Management
- Automotive Sensing and Control
- Industrial Monitoring
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit 2839A is a high voltage, high side current sense circuit featuring the LTC6115. This circuit measures inputs up to 100V and 2A. The board can be connected to Linduino® as a shield and has an accompanying Linduino sketch. The gain of the current sense channel may be set with jumpers to 5V/A (100V/V) or 2.5V/A (50V/V), and the gain of the voltage sense channel may be selected with jumpers for unity gain or 2V/V.
The DC2839A includes a 4-terminal 50mΩ sense resistor with a footprint for larger, higher-power rated parts. A 1:1000 resistor divider can be selected with jumpers to provide simulated mV-scale input difference voltages if high currents are not available.
The voltage sense and current sense can be configured to measure the same input or separate inputs.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.