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Analog Devices Inc. LT1999IMS8-20F#PBF
- Part No.:
- LT1999IMS8-20F#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999IMS8-20F#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:140
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Product details
Overview
LT1999IMS8-20F#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 20V/V fixed gain, –5V to 80V input common mode range, 2MHz bandwidth, and FMEA-optimized 8-lead MSOP package. It senses shunt-based motor phase currents in H-bridge drives and battery charge/discharge paths while maintaining ±0.5% gain accuracy and <1.5mV input offset.
For engineers reviewing the LT1999IMS8-20F#PBF datasheet, LT1999IMS8-20F#PBF pinout, LT1999IMS8-20F#PBF application, or LT1999IMS8-20F#PBF equivalent, this page delivers verified electrical specs, FMEA pinout mapping, automotive-grade temperature support (–40°C to 85°C), and real-world use cases in PWM control loops and solenoid monitoring.
Technical Context
The LT1999IMS8-20F#PBF uses matched on-chip resistor networks (R+IN/R–IN = 4kΩ each) and transconductance amplification to convert differential shunt voltage into a level-shifted output referenced to the REF pin. Its internal 160kΩ/160kΩ divider sets mid-supply bias unless overridden externally.
Operation remains stable across two distinct common mode regimes: above V+ (D1 off) and below V+ (D1 active), enabling seamless transition between high-side and low-side sensing without gain or offset discontinuity. The FMEA-optimized pinout relocates NC to Pin 3 to prevent misconnection-induced failure modes in safety-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V ±0.5% - enables precise 50mV full-scale shunt sensing for 10A current measurement with ±50mA resolution |
| Common Mode Range | –5V to 80V - supports direct connection to 48V battery rails and industrial 24V/48V bus monitoring without level-shifting |
| Bandwidth | 2MHz - captures fast transient currents in PWM-driven motors and switching power supplies up to 500kHz switching frequency |
| Input Offset Voltage | ±1.5mV max - contributes ≤±75μA error at 50mV sense voltage, critical for low-current battery state-of-charge tracking |
| Supply Current | 1.55mA active / <10μA shutdown - allows always-on monitoring in energy-constrained automotive ECUs |
| Operating Temp | –40°C to 85°C - qualified for under-hood automotive applications per AEC-Q100 Grade I requirements |
| ESD Rating | 4kV HBM / 1kV CDM - withstands assembly handling and field ESD events in industrial environments |
Pinout & Package
Package: 8-lead plastic MSOP with FMEA-optimized pinout (Pin 3 = NC), 3.0mm × 3.0mm footprint, 0.65mm pitch, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Positive sense input | Connects to high-side of shunt; accepts common mode up to 80V; matched 4kΩ input impedance |
| –IN (Pin 2) | Negative sense input | Connects to low-side of shunt; forms differential pair with +IN for bidirectional current polarity detection |
| NC (Pin 3) | No connect | FMEA-designated unused pin prevents incorrect routing to supply or ground in safety-critical PCB layouts |
| V+ (Pin 4) | Power supply | 5V ±0.5V supply input; Pins 1 and 4 internally tied; supports 4.5V–5.5V operation |
| GND (Pin 5) | Ground reference | Return path for supply and REF divider; must be low-impedance connection to minimize noise coupling |
| REF (Pin 6) | Output reference | Sets output common-mode level; default = V+/2; external override enables custom bias for ADC interfacing |
| OUT (Pin 7) | Amplified output | Drives 200pF directly; sourcing/sinking capability (6mA/15mA) supports direct connection to microcontroller ADC inputs |
| SHDN (Pin 8) | Shutdown control | Active-low enable; <0.5V = shutdown (<10μA); floating = active via internal 2μA pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Outputs positive/negative voltage relative to REF to indicate current direction-essential for regenerative braking and battery charging/discharging |
| Smooth CM transition | No gain or offset discontinuity when common mode crosses V+-enables single device to monitor both high-side and low-side shunts |
| FMEA-optimized pinout | NC placed at Pin 3 to eliminate risk of accidental shorting to supply or ground during layout or rework-required for ISO 26262 ASIL-B designs |
| High CMRR | >96dB over –5V to 80V range-rejects bus noise in noisy motor drive environments where dV/dt exceeds 100V/μs |
| Automotive qualification | AEC-Q100 Grade I (–40°C to 85°C)-certified for engine control, transmission, and ADAS subsystems |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Monitoring bidirectional armature current in 48V electric power steering (EPS) systems during assist and return phases. IC Role / Device Role / Timing Role: High-side shunt amplifier feeding analog input of MCU ADC; provides real-time current feedback for torque control loop. Use Value: 2MHz bandwidth captures PWM ripple; ±0.5% gain accuracy ensures precise torque command execution within ±2% mechanical tolerance. | Use Scenario: Detecting coil energization and de-energization in automotive transmission shift solenoids. IC Role / Device Role / Timing Role: Low-side current monitor connected to solenoid return path; outputs voltage proportional to coil current magnitude and polarity. Use Value: –5V to 80V common mode range accommodates back-EMF spikes up to 75V; <1.5mV offset enables reliable detection of <100mA hold current. |
| High Voltage Data Acquisition | PWM Control Loops |
Use Scenario: Measuring battery pack current in 400V EV traction inverters during charge/discharge cycles. IC Role / Device Role / Timing Role: Isolated shunt amplifier stage preceding isolated sigma-delta ADC; REF pin biased to match ADC common-mode input range. Use Value: 4kV HBM rating protects against ESD during service; 80V max CM voltage supports direct connection to pre-charge circuitry. | Use Scenario: Closed-loop current regulation in industrial DC-DC converters using synchronous rectification. IC Role / Device Role / Timing Role: Fast-response current sensor in inner current loop; feeds error signal to PWM controller for cycle-by-cycle current limiting. Use Value: 2.5μs settling time enables sub-microsecond current fault response; 2MHz bandwidth supports >200kHz switching frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V gain, 80V CM range, but only 440kHz bandwidth and no FMEA pinout | Lower bandwidth limits use in >100kHz PWM systems; lacks NC pin for functional safety layout | Select when cost sensitivity outweighs need for 2MHz response or ASIL-B compliance |
| MAX40056ATA+T | 20V/V gain, 65V CM range, 1.5MHz bandwidth, 8-lead TDFN package | Reduced CM range excludes 80V industrial applications; smaller TDFN footprint increases thermal resistance | Prefer for space-constrained consumer electronics where 65V CM suffices and MSOP is unavailable |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999IMS8-20F#PBF uniquely combines 2MHz bandwidth, 80V common mode, and FMEA-optimized pinout-making it the only option qualified for high-dV/dt automotive motor control requiring both speed and functional safety.
Availability
LT1999IMS8-20F#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, solenoid actuation, and high-voltage data acquisition requiring stable component supply across automotive, industrial, and energy storage applications.
Supply support for LT1999IMS8-20F#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1999 product line delivers precision, high-voltage current sensing for safety-critical motor control and power conversion-designed specifically for AEC-Q100 automotive qualification and functional safety (ISO 26262) readiness.
FAQ
What is the exact gain accuracy specification for LT1999IMS8-20F#PBF over temperature?
The LT1999IMS8-20F#PBF guarantees ±0.5% gain error over its full operating temperature range of –40°C to 85°C, verified at ΔVOUT = ±2V. This accuracy holds across the entire –5V to 80V common mode input range and is independent of REF pin voltage within its specified range (1.125V to V+ – 1.125V).
Does LT1999IMS8-20F#PBF support both high-side and low-side current sensing configurations?
Yes, the LT1999IMS8-20F#PBF supports seamless high-side and low-side sensing due to its –5V to 80V common mode input range and smooth transition behavior across V+. When VCM < V+, internal diode D1 activates to bias inputs; when VCM > V+, D1 turns off-both modes maintain identical gain and offset performance without discontinuity.
What is the purpose of the NC pin (Pin 3) in the FMEA-optimized pinout of LT1999IMS8-20F#PBF?
The NC pin (Pin 3) in the LT1999IMS8-20F#PBF's FMEA-optimized MSOP package is intentionally unconnected to prevent catastrophic misrouting. In safety-critical layouts, placing NC at Pin 3 eliminates risk of accidental shorting to adjacent V+ (Pin 4) or GND (Pin 5), reducing single-point failure modes required for ISO 26262 ASIL-B compliance.
Can the REF pin of LT1999IMS8-20F#PBF be driven by an external voltage source?
Yes, the REF pin of LT1999IMS8-20F#PBF accepts external bias voltages from 1.125V to V+ – 1.125V (e.g., 1.125V to 3.875V at V+ = 5V). Its 60kΩ–100kΩ input impedance allows direct connection to precision voltage references or DAC outputs-enabling flexible output level shifting for ADC interface optimization.
How does LT1999IMS8-20F#PBF handle common mode transients in motor drive applications?
The LT1999IMS8-20F#PBF recovers from ±50V common mode steps (20ns rise/fall) in ≤1.0μs while maintaining DC accuracy-critical for H-bridge shoot-through immunity. Its >96dB CMRR at DC and >80dB at 100kHz rejects high-dV/dt noise from gate drivers and power switches without requiring external filtering.
LT1999IMS8-20F#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 137.5 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 5.8mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1999IMS8-20F#PBF FAQ
1.How can I place an order for LT1999IMS8-20F#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999IMS8-20F#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1999IMS8-20F#PBF reliable?
The price and inventory of LT1999IMS8-20F#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999IMS8-20F#PBF is usually 5 days.
3.What payment methods are accepted for LT1999IMS8-20F#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999IMS8-20F#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999IMS8-20F#PBF?
LT1999IMS8-20F#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999IMS8-20F#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1999IMS8-20F#PBF?
For technical support, including LT1999IMS8-20F#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999IMS8-20F#PBF requirements.
6.How does Aetrix verify that LT1999IMS8-20F#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999IMS8-20F#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1999IMS8-20F#PBF meets industry standards.
7.What is the process for return or replacement of LT1999IMS8-20F#PBF?
All LT1999IMS8-20F#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999IMS8-20F#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1999IMS8-20F#PBF part is unused and in its original packaging.
Return procedure for LT1999IMS8-20F#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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