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Analog Devices Inc. LT1999IMS8-20#TRPBF
- Part No.:
- LT1999IMS8-20#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999IMS8-20#TRPBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,409
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Product details
Overview
LT1999IMS8-20#TRPBF from Analog Devices is a high-speed, bidirectional current sense amplifier with 20V/V fixed gain, –5V to 80V input common mode range, 2MHz bandwidth, and ±0.5% gain accuracy-designed for precise H-bridge motor current monitoring in industrial drives and automotive battery management systems.
For engineers reviewing the LT1999IMS8-20#TRPBF datasheet, LT1999IMS8-20#TRPBF pinout, LT1999IMS8-20#TRPBF application, or LT1999IMS8-20#TRPBF equivalent, this page delivers verified specifications, FMEA-optimized MSOP-8 pin configuration, thermal performance across –40°C to 85°C, and real-world use cases in PWM-controlled solenoid drivers and high-side fuse monitoring.
Technical Context
The LT1999IMS8-20#TRPBF employs a matched resistor-based transconductance architecture with internal 4kΩ differential input impedance and 80kΩ gain-setting resistor (RG), enabling accurate current-to-voltage conversion independent of supply rail variations. Its dual-path biasing (D1-assisted below V+ and passive above V+) ensures seamless operation across the full –5V to 80V common mode range without gain discontinuity or offset shift.
It integrates a mid-supply reference generator via 160kΩ/160kΩ divider on REF pin, supports external reference override, and features shutdown control with <10µA quiescent current. The output stage delivers ±31mA sourcing/sinking capability into 50Ω loads while maintaining 0.5% settling within 2.5µs for ±2V steps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V fixed-enables direct scaling of ±0.2V shunt voltage to ±4V output for ADC interfacing. |
| Common Mode Range | –5V to 80V-supports high-side sensing in 48V industrial systems and low-side sensing in negative-rail battery monitors. |
| Bandwidth | 2MHz-captures fast current transients in PWM switching power supplies operating up to 500kHz. |
| Input Offset Voltage | ±1.5mV max-limits current measurement error to ≤75µA when using 20mΩ shunt at 20V/V gain. |
| Supply Current | 1.55mA typical at VCM > 5.5V-enables low-power operation in always-on battery protection circuits. |
| Shutdown Current | <10µA-reduces system standby power in automotive ECU modules during sleep mode. |
| Operating Temp | –40°C to 85°C-qualified for industrial automation and under-hood automotive applications per I-grade spec. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8), 3mm × 3mm, 0.65mm pitch, FMEA-optimized pinout (non-original layout) with NC on Pin 3 for fault isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Positive Sense Input | Connects to high-potential side of shunt; matched with –IN for differential sensing. |
| –IN (Pin 2) | Negative Sense Input | Connects to low-potential side of shunt; enables bidirectional current polarity detection. |
| NC (Pin 3) | No Connect | FMEA-designated open pin prevents short-circuit propagation in fault conditions. |
| V+ (Pin 4) | Power Supply | 4.5V–5.5V supply input; Pins 1 & 4 internally tied in original layout but isolated in FMEA variant. |
| GND (Pin 5) | Ground Reference | Return path for internal bias and output stage; requires low-impedance PCB connection. |
| REF (Pin 6) | Output Common-Mode Reference | Sets output midpoint; default = V+/2, adjustable externally for level-shifting into ADC input range. |
| OUT (Pin 7) | Amplified Output | Delivers VOUT = 20×(V+IN − V−IN) + VREF; drives 200pF directly or ≥100Ω + capacitive loads. |
| SHDN (Pin 8) | Shutdown Control | Active-low enable; ≤0.5V disables amplifier, floating or ≥V+−0.5V enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Sensing | Outputs positive/negative voltage relative to REF to indicate current direction-critical for regenerative braking current monitoring. |
| Smooth CM Transition | No gain or offset discontinuity across –5V to 80V range-eliminates calibration gaps in wide-input-range motor controllers. |
| 4kV HBM ESD Rating | Robust input protection enables direct placement near noisy power stages without external TVS diodes. |
| AEC-Q100 Qualified | Validated for automotive applications (H-grade variants); this I-grade part shares same process and reliability structure. |
| Low-Power Shutdown | Reduces supply current to <10µA-extends battery life in portable test equipment and IoT edge sensors. |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Monitoring armature current in 24V/48V brushed DC motor drives with PWM commutation at 20kHz. IC Role / Device Role / Timing Role: Bidirectional current amplifier providing real-time magnitude/direction feedback to MCU for torque regulation and stall detection. Use Value: 2MHz bandwidth captures PWM-edge current spikes; ±0.5% gain accuracy enables <1% torque control error over temperature. | Use Scenario: Closed-loop control of 12V automotive solenoids in transmission valve bodies with peak currents up to 5A. IC Role / Device Role / Timing Role: High-side current sensor feeding analog input of body control module (BCM) for duty-cycle adaptation. Use Value: –5V to 80V common mode range accommodates load-dump transients; FMEA pinout reduces single-point failure risk. |
| High Voltage Data Acquisition | PWM Control Loops |
Use Scenario: Isolated current measurement in 400V EV battery pack monitoring units using resistive shunts. IC Role / Device Role / Timing Role: Front-end analog conditioner converting shunt voltage to ratiometric output referenced to system ADC's VREF. Use Value: REF pin flexibility allows alignment with 2.5V or 3.3V ADC references; 96dB CMRR rejects bus noise at 100kHz. | Use Scenario: Real-time current feedback in synchronous buck converters operating at 1MHz switching frequency. IC Role / Device Role / Timing Role: Fast-settling current sense element feeding current-mode PWM controller for cycle-by-cycle overcurrent protection. Use Value: 2.5µs 0.5% settling time ensures accurate current sampling within 100ns of PWM edge; 3V/µs slew rate avoids distortion. |
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 400kHz bandwidth and no FMEA pinout option. | Lower bandwidth limits use in >200kHz switching converters; automotive grade but lacks MSOP FMEA variant. | Select when cost sensitivity outweighs speed requirements and board-level fault isolation is handled elsewhere. |
| MAX40056ATA+T | 20V/V gain, 65V CM range, 1.5MHz bandwidth, 12-bit integrated ADC interface-not available in MSOP package. | Integrated digital interface simplifies MCU integration but eliminates analog flexibility; narrower CM range excludes 80V applications. | Select when digital output and smaller footprint (WLP-6) are prioritized over analog precision and 80V operation. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999IMS8-20#TRPBF uniquely combines 2MHz bandwidth, 80V common mode, FMEA-optimized MSOP-8 packaging, and sub-µs common-mode recovery-making it optimal for high-reliability, high-speed industrial motor drives where analog fidelity and fault resilience are critical.
Availability
LT1999IMS8-20#TRPBF is available at Aetrix Electronics and suitable for industrial motor control, automotive solenoid actuation, and high-voltage battery monitoring requiring stable component supply and long-term lifecycle support.
Supply support for LT1999IMS8-20#TRPBF 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-speed current sensing for demanding power electronics applications-including H-bridge control, battery management, and industrial actuation-where accuracy, bandwidth, and robustness across extreme common-mode voltages are essential.
FAQ
What is the maximum common mode voltage supported by the LT1999IMS8-20#TRPBF?
The LT1999IMS8-20#TRPBF supports an input common mode voltage range of –5V to 80V, verified across its full operating temperature range (–40°C to 85°C). This enables reliable high-side sensing in 48V industrial systems and compatibility with load-dump transients in automotive environments. Absolute maximum ratings extend to –5.25V and 88V for short-duration stress conditions.
Does the LT1999IMS8-20#TRPBF require external components for basic operation?
Yes-the LT1999IMS8-20#TRPBF requires two 0.1µF bypass capacitors (V+ to GND), and the REF pin defaults to mid-supply via internal 160kΩ/160kΩ divider. External resistors are optional: a pull-down on SHDN for active-low control, or an external voltage source on REF for custom output referencing. No gain-setting resistors are needed-the 20V/V ratio is factory-trimmed.
How does the FMEA-optimized pinout of the LT1999IMS8-20#TRPBF improve system reliability?
The LT1999IMS8-20#TRPBF uses an FMEA-optimized MSOP-8 pinout with NC on Pin 3, physically isolating the +IN and –IN inputs from adjacent power and output pins. This layout minimizes risk of short-circuit propagation during solder bridging or PCB contamination-critical in safety-critical automotive and industrial applications where single-point failures must be contained.
Can the LT1999IMS8-20#TRPBF be used in battery charge/discharge monitoring?
Yes-the LT1999IMS8-20#TRPBF is explicitly designed for bidirectional current sensing in battery management, supporting full-charge-to-depletion monitoring. Its ±0.5% gain accuracy, low offset drift (5µV/°C), and ability to operate down to –5V common mode enable accurate measurement of charging current (positive polarity) and discharge/regenerative current (negative polarity) across Li-ion, lead-acid, and LFP chemistries.
What is the typical power consumption of the LT1999IMS8-20#TRPBF in active and shutdown modes?
In active mode with VCM > 5.5V, the LT1999IMS8-20#TRPBF draws 1.55mA typical supply current. In shutdown mode (SHDN ≤ 0.5V), supply current drops to <10µA-verified over –40°C to 85°C. This ultra-low shutdown current makes the LT1999IMS8-20#TRPBF suitable for always-connected battery-powered devices requiring extended standby life.
LT1999IMS8-20#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
- 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
LT1999IMS8-20#TRPBF FAQ
1.How can I place an order for LT1999IMS8-20#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999IMS8-20#TRPBF 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 LT1999IMS8-20#TRPBF reliable?
The price and inventory of LT1999IMS8-20#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999IMS8-20#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1999IMS8-20#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999IMS8-20#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999IMS8-20#TRPBF?
LT1999IMS8-20#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999IMS8-20#TRPBF 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 LT1999IMS8-20#TRPBF?
For technical support, including LT1999IMS8-20#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999IMS8-20#TRPBF requirements.
6.How does Aetrix verify that LT1999IMS8-20#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1999IMS8-20#TRPBF 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 LT1999IMS8-20#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1999IMS8-20#TRPBF?
All LT1999IMS8-20#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999IMS8-20#TRPBF, 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 LT1999IMS8-20#TRPBF part is unused and in its original packaging.
Return procedure for LT1999IMS8-20#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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