LT1999IMS8-50#PBF Analog Devices Integrated Circuit (Small Outline Packages) In Stock
LT1999IMS8-50#PBF is a high-voltage bidirectional current sense amplifier from Analog Devices with 120 dB CMRR and a fixed gain of 50 V/V. It operates from high-side or low-side rails and is housed in a compact 8-pin MSOP package for power management applications.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LT1999IMS8-50#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $2.9900(MOQ 19)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 120 dB common-mode rejection ratio (CMRR) enabling accurate current sensing even on high-voltage supply rails
- Fixed gain of 50 V/V with current-feedback architecture for fast, stable transient response in dynamic load applications
- Bidirectional current sensing capability supporting both sourcing and sinking current measurement in a single device
- Compact 8-pin MSOP package suitable for high-density power management and motor driver PCB designs
- Frequency-compensated design ensuring stable operation across wide bandwidth without external compensation networks
Applications
The LT1999IMS8-50#PBF is designed for high-side and low-side current sensing in motor drives, battery management systems, and DC-DC converter current-mode control loops requiring accurate bidirectional measurement. Its 120 dB CMRR allows precise sensing of small differential voltages across shunt resistors even when the common-mode voltage swings across the full supply rail. It is also used in solar inverters, power tool current monitoring, and overcurrent protection circuits where fast response and high rejection of supply noise are critical.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1660 |
| YTEOL | 10 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | CURRENT-FEEDBACK |
| Average Bias Current-Max (IIB) | 1500 µA |
| Common-mode Reject Ratio-Nom | 120dB |
| Frequency Compensation | YES |
| Input Offset Voltage-Max | 1500 µV |
| JESD-30 Code | S-PDSO-G8 |
| JESD-609 Code | e3 |
| Low-Bias | NO |
| Low-Offset | NO |
| Micropower | NO |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Power | NO |
| Programmable Power | NO |
| Qualification Status | Not Qualified |
| Slew Rate-Nom | 3V/us |
| Supply Current-Max | 1.9mA |
| Supply Voltage Limit-Max | 6V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Gain-Min | 49.75 |
| Wideband | NO |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the CMRR of LT1999IMS8-50#PBF and why does high CMRR matter for high-voltage current sensing?
The LT1999IMS8-50#PBF achieves a common-mode rejection ratio (CMRR) of 120 dB, meaning it can resolve the small differential voltage across a shunt resistor even when the common-mode voltage on both inputs is hundreds of volts. At 120 dB, a 100V common-mode swing produces less than 0.1 mV of error at the output at the 50 V/V gain setting, ensuring accurate current measurement in high-voltage battery packs, motor drives, and industrial power supplies.
What gain does LT1999IMS8-50#PBF provide and how should it be used to set the output voltage range for a microcontroller ADC?
The LT1999IMS8-50#PBF provides a fixed gain of 50 V/V. For a 10 mΩ shunt resistor carrying up to 10A of current, the voltage across the shunt is 100 mV, and the amplifier output is 5V — directly compatible with a 5V ADC reference. For a 3.3V ADC system, selecting a smaller shunt of 6.6 mΩ or a lower gain variant keeps the output within the ADC's 3.3V full-scale range at maximum current.
Does LT1999IMS8-50#PBF support bidirectional current sensing and how does this benefit motor drive designs?
Yes, the LT1999IMS8-50#PBF supports bidirectional current sensing, measuring both positive (source) and negative (sink) current through the shunt resistor. In a DC motor drive, bidirectional sensing allows the controller to measure regenerative braking current flowing back into the supply as well as drive current flowing to the motor, enabling full four-quadrant torque control and accurate energy recovery monitoring without separate unidirectional sense amplifiers for each direction.
How does the input offset voltage specification of LT1999IMS8-50#PBF affect measurement accuracy at low current levels?
The LT1999IMS8-50#PBF has a maximum input offset voltage of 1500 µV (1.5 mV). At a gain of 50 V/V, this offset contributes up to 75 mV of output error, which translates to a current error of 7.5A on a 10 mΩ shunt — significant for low-current measurements. For precision sensing below 1A, a lower-offset device or a larger shunt resistor (such as 100 mΩ producing 100 mV full scale at 1A) is recommended to keep offset error below 1.5% of full scale.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 19+ | $3.9600 | $75.24 |
| 250+ | $3.3844 | $846.10 |
| 500+ | $3.2500 | $1625.00 |
| 1000+ | $2.9900 | $2990.00 |
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