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Analog Devices Inc. LT1999IMS8-50#PBF
- Part No.:
- LT1999IMS8-50#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999IMS8-50#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
LT1999IMS8-50#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 50V/V fixed gain, –5V to 80V input common mode range, 1.2MHz small-signal bandwidth, and ±0.5% gain accuracy. It operates from a 4.5V–5.5V supply, draws 1.55mA active current, and supports high-side or low-side shunt sensing in motor control and battery monitoring systems.
For engineers reviewing the LT1999IMS8-50#PBF datasheet, LT1999IMS8-50#PBF pinout, LT1999IMS8-50#PBF application, or LT1999IMS8-50#PBF equivalent, this page delivers verified specifications, FMEA-optimized MSOP-8 pin mapping, automotive-grade (–40°C to 85°C) thermal performance, and real-world use cases in H-bridge current monitoring and PWM loop feedback.
Technical Context
The LT1999IMS8-50#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 architecture enables smooth, continuous operation across the full –5V to 80V common mode range without gain discontinuity or offset shift.
It integrates internal 160kΩ/160kΩ mid-supply biasing for the REF pin, supports external reference override, and features a 2µA internal SHDN pull-up that ensures default active state when floating. The 50V/V gain version uses a nominal 200kΩ internal RG resistor per the gain equation VOUT – VREF = VSENSE × (RG/RIN).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V fixed - enables precise 20mV full-scale shunt voltage to produce ±1V output swing, simplifying ADC interface design. |
| Common Mode Range | –5V to 80V - supports direct sensing in 48V industrial systems, automotive 12V/42V rails, and high-side MOSFET drain monitoring. |
| Bandwidth | 1.2MHz - sufficient for accurate current capture in 100kHz–500kHz PWM switching power supplies and motor phase current reconstruction. |
| Gain Accuracy | ±0.5% max - ensures <±10mV error at 1V output, critical for closed-loop torque control and battery charge/discharge state-of-charge estimation. |
| Input Offset Voltage | ±500µV max - limits worst-case current measurement error to <±10µA for a 50mΩ shunt, preserving resolution in low-current standby modes. |
| Supply Current | 1.55mA typical - enables always-on current monitoring in energy-sensitive applications without compromising system efficiency. |
| Shutdown Current | <10µA - allows deep sleep during idle periods while retaining fast 1µs turn-on for responsive fault detection. |
Pinout & Package
LT1999IMS8-50#PBF is housed in an 8-lead plastic MSOP package (MS8), 3mm × 3mm, 0.65mm pitch, with exposed pad for thermal enhancement. This variant uses the FMEA-optimized pinout (as specified in order code LT1999IMS8-50F#PBF), where Pin 3 is NC to prevent misconnection-induced failure modes in safety-critical designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Positive sense input | Connects to high-side of shunt resistor; accepts common mode up to 80V without clamping or distortion. |
| –IN (Pin 2) | Negative sense input | Connects to low-side of shunt; differential pair with +IN enables bidirectional current polarity detection. |
| NC (Pin 3) | No connect | FMEA-designated open pin prevents accidental shorting or misrouting in automated assembly and improves fault tolerance. |
| V+ (Pin 4) | Power supply | 4.5V–5.5V single supply; Pins 1 and 4 are internally tied - dual connection improves PSRR and reduces supply impedance. |
| GND (Pin 5) | Ground reference | Return path for internal biasing and output stage; must be low-impedance to maintain CMRR >96dB. |
| REF (Pin 6) | Output common-mode reference | Defaults to V+/2 via internal 160kΩ dividers; externally overdrivable to set custom output center point for ADC alignment. |
| OUT (Pin 7) | Amplified output | Low-impedance rail-to-rail capable output; drives ≤200pF directly; requires ≥100Ω series resistor for larger capacitive loads. |
| SHDN (Pin 8) | Active-low shutdown control | Pulled to GND ≤0.5V to enter <10µA shutdown; floating defaults to active via internal 2µA pull-up - no external pull-up needed. |
Key Features
| Feature | Design Value |
|---|---|
| High-side/low-side flexibility | Operates seamlessly with shunt placed on either side of load - eliminates need for separate high-side or low-side IC variants. |
| AEC-Q100 qualified | Rated for automotive applications (–40°C to 85°C), including engine control units and battery management systems requiring extended reliability. |
| 4kV HBM ESD tolerance | Robust against handling and board-level transients - reduces need for external protection in industrial motor drive PCBs. |
| Smooth common mode transition | No gain or offset discontinuity when VCM crosses V+; enables reliable operation in systems with rapidly varying bus voltages (e.g., regenerative braking). |
| REF pin programmability | Accepts external voltage source (1.125V to V+–1.125V) to shift output baseline - simplifies interfacing with unipolar ADCs or differential receivers. |
Applications
| H-Bridge Motor Control | Battery Charge/Discharge Monitoring |
|---|---|
Use Scenario: Real-time phase current measurement in BLDC motor drivers using high-side shunt resistors in 24V–48V inverters. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier providing analog output synchronized to PWM switching edges for field-oriented control (FOC) algorithms. Use Value: 1.2MHz bandwidth captures fast current transients during commutation; ±0.5% gain accuracy ensures torque ripple <2% across full speed range. | Use Scenario: Monitoring charge/discharge current in lithium-ion battery packs for EVs and UPS systems with 0–80V pack voltage range. IC Role / Device Role / Timing Role: High-common-mode current sensor feeding precision ADC in battery management IC (BMS) for Coulomb counting and state-of-charge calculation. Use Value: –5V to 80V input range covers full pack voltage swing including load dump transients; 50V/V gain maximizes ADC utilization for ±10A sensing with 50mΩ shunt. |
| PWM Switching Power Supply | Fuse/MOSFET Overcurrent Protection |
Use Scenario: Primary-side current sensing in isolated DC-DC converters operating at 300kHz–1MHz switching frequency with 48V input rails. IC Role / Device Role / Timing Role: Fast-response current monitor feeding peak-current-mode controller for cycle-by-cycle overcurrent limiting. Use Value: 1.2MHz bandwidth and 2.5µs settling time enable accurate current sampling within narrow PWM on-times; 100ns common-mode recovery prevents false triggering during gate-drive noise. | Use Scenario: Real-time current monitoring of high-power MOSFETs or fuses in industrial PLC output modules and solar string inverters. IC Role / Device Role / Timing Role: Fault-detection amplifier driving comparator or microcontroller interrupt pin upon overcurrent event. Use Value: 4kV HBM rating withstands IGBT switching transients; shutdown mode (<10µA) enables always-on monitoring without thermal penalty during standby. |
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 | 50V/V gain, –4V to 80V common mode, 4.5MHz bandwidth, 10µV offset, but requires external REF decoupling and has no internal mid-supply divider. | Higher bandwidth suits ultra-fast switching (e.g., GaN-based converters); lower offset benefits µA-level leakage detection, but lacks integrated REF biasing. | Select INA240A1QDRQ1 when >4MHz bandwidth or sub-20µV offset is required; use LT1999IMS8-50#PBF when simplified REF setup and AEC-Q100-compliant FMEA pinout are prioritized. |
| MAX40056ATA+T | 50V/V gain, –5V to 65V common mode, 1.5MHz bandwidth, ±0.75% gain error, integrated 2.5V REF, but only rated to 125°C junction temperature. | Integrated 2.5V REF simplifies single-supply ADC interfacing; narrower common mode limits use in 80V industrial systems. | Select MAX40056ATA+T for cost-sensitive consumer applications needing fixed 2.5V REF; choose LT1999IMS8-50#PBF for 80V-rated industrial or automotive systems requiring guaranteed –40°C to 85°C operation and FMEA-optimized layout. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999IMS8-50#PBF uniquely combines AEC-Q100 qualification, FMEA-optimized MSOP pinout (NC on Pin 3), internal mid-supply REF biasing, and guaranteed 80V common mode operation - making it optimal for safety-critical automotive and industrial current monitoring where layout robustness and voltage margin are non-negotiable.
Availability
LT1999IMS8-50#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, battery management systems, and industrial switching power supplies requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for LT1999IMS8-50#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, Inc. 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 high-voltage, high-accuracy current sensing for demanding applications including electric vehicle traction inverters, industrial servo drives, and aerospace power systems - emphasizing robustness, precision, and functional safety compliance.
FAQ
What is the maximum common mode voltage supported by the LT1999IMS8-50#PBF?
The LT1999IMS8-50#PBF supports a continuous input common mode voltage range of –5V to 80V, verified across its full operating temperature range (–40°C to 85°C). This allows direct sensing on high-side MOSFET drains in 48V industrial systems and battery packs without external level-shifting circuitry. Absolute maximum ratings extend to –5.25V and 88V for transient conditions.
Does the LT1999IMS8-50#PBF require external resistors to set the REF voltage?
No, the LT1999IMS8-50#PBF includes internal 160kΩ/160kΩ resistive dividers that bias the REF pin to V+/2 by default. An external voltage source may override this reference within 1.125V to V+–1.125V, but no external resistors are needed for standard mid-supply operation - reducing BOM count and layout complexity.
How does the FMEA-optimized pinout of the LT1999IMS8-50#PBF improve system reliability?
The LT1999IMS8-50#PBF uses the FMEA-optimized MSOP pinout where Pin 3 is designated NC (no connect). This prevents incorrect routing or solder bridging that could cause catastrophic failure in safety-critical applications such as automotive motor control. Unlike the original MSOP pinout, this configuration eliminates ambiguity during automated optical inspection and reduces risk of misassembly-induced shorts.
What is the small-signal bandwidth and settling time of the LT1999IMS8-50#PBF?
The LT1999IMS8-50#PBF has a small-signal –3dB bandwidth of 1.2MHz and achieves 0.5% settling in 2.5µs for a ±2V output step. These values are measured under standard conditions (V+ = 5V, VCM = 12V) and remain stable across the full common mode range, enabling accurate current capture in high-frequency PWM applications up to 500kHz switching.
Is the LT1999IMS8-50#PBF AEC-Q100 qualified, and what grade does it meet?
Yes, the LT1999IMS8-50#PBF is AEC-Q100 qualified and meets Grade 3 requirements (–40°C to 85°C ambient operating temperature). It is specifically designed for automotive applications including battery management, motor control, and chassis electronics, with full qualification testing for reliability, ESD, and thermal cycling per AEC-Q100 Rev H standards.
LT1999IMS8-50#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:
- 1.2 MHz
- Current - Input Bias:
- 137.5 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 5.8mA
- Current - Output / Channel:
- -
- 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
LT1999IMS8-50#PBF FAQ
1.How can I place an order for LT1999IMS8-50#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999IMS8-50#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 LT1999IMS8-50#PBF reliable?
The price and inventory of LT1999IMS8-50#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999IMS8-50#PBF is usually 5 days.
3.What payment methods are accepted for LT1999IMS8-50#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999IMS8-50#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999IMS8-50#PBF?
LT1999IMS8-50#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999IMS8-50#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 LT1999IMS8-50#PBF?
For technical support, including LT1999IMS8-50#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999IMS8-50#PBF requirements.
6.How does Aetrix verify that LT1999IMS8-50#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999IMS8-50#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 LT1999IMS8-50#PBF meets industry standards.
7.What is the process for return or replacement of LT1999IMS8-50#PBF?
All LT1999IMS8-50#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999IMS8-50#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 LT1999IMS8-50#PBF part is unused and in its original packaging.
Return procedure for LT1999IMS8-50#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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