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Analog Devices Inc. LT1999IMS8-10#TRPBF
- Part No.:
- LT1999IMS8-10#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999IMS8-10#TRPBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,934
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Product details
Overview
LT1999IMS8-10#TRPBF from Analog Devices is a high-speed, bidirectional current sense amplifier with 10V/V fixed gain, –5V to 80V input common mode range, 2MHz bandwidth, and ±0.5% gain accuracy. It senses current via external shunt resistor and outputs a voltage referenced to mid-supply or external REF, enabling precise bidirectional current monitoring in H-bridge motor controls and battery charge/discharge systems.
For engineers reviewing the LT1999IMS8-10#TRPBF datasheet, LT1999IMS8-10#TRPBF pinout, LT1999IMS8-10#TRPBF application, or LT1999IMS8-10#TRPBF equivalent, this device delivers verified performance for high-side/low-side sensing in automotive-grade industrial power systems requiring AEC-Q100 compliance, FMEA-aware layout, and operation from –40°C to 85°C.
Technical Context
The LT1999IMS8-10#TRPBF uses matched on-chip resistive input networks (R+IN/R–IN = 4kΩ each) and transconductance-to-transresistance architecture to achieve smooth, continuous operation across its full –5V to 80V common mode range. Its internal 160kΩ/160kΩ REF divider sets default mid-supply bias, while external REF override supports custom output common-mode levels.
It features integrated ESD clamps on +IN/–IN pins enabling robust operation at extreme common mode voltages, and a dedicated SHDN pin with 2µA internal pull-up that enables <10µA shutdown current. The 8-lead MSOP package supports both original and FMEA-optimized pinouts - this part uses the original pinout (Pin 1 = V+, Pin 2 = +IN, Pin 3 = –IN, Pin 4 = V+, Pin 5 = GND, Pin 6 = REF, Pin 7 = OUT, Pin 8 = SHDN).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V ±0.5% - ensures accurate scaling of shunt voltage to output without calibration in production systems. |
| Common Mode Range | –5V to 80V - supports direct sensing in high-voltage DC bus, solenoid drivers, and battery stacks up to 80V. |
| Bandwidth | 2MHz - enables real-time current feedback in PWM control loops with switching frequencies up to 500kHz. |
| Input Offset Voltage | ±1.5mV max - limits error to ≤0.15% of full-scale sense voltage (±350mV), critical for low-current precision. |
| Supply Current | 1.55mA typical at V+ = 5V - allows integration into power-constrained systems without thermal derating. |
| Shutdown Current | <10µA - enables energy-efficient sleep modes in battery-powered telemetry and portable equipment. |
| Operating Temp | –40°C to 85°C - qualified for industrial and automotive under-hood applications per I-grade specification. |
Pinout & Package
LT1999IMS8-10#TRPBF is housed in an 8-lead plastic MSOP (MS8) package with original pinout configuration and specified thermal resistance θJA = 300°C/W. This variant does not use the FMEA-optimized pinout (which relocates NC to Pin 3); it follows the standard layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4 | V+ | Power supply input (4.5V–5.5V); Pins 1 and 4 are internally tied - both must be connected to clean 5V rail with local 0.1µF decoupling. |
| 2 | +IN | Positive differential sense input; ESD-clamped to support –5.25V to 88V common mode without damage. |
| 3 | –IN | Negative differential sense input; matched impedance to +IN ensures CMRR >96dB over full temperature range. |
| 5 | GND | Analog ground reference; must be star-connected to shunt resistor ground to avoid measurement errors. |
| 6 | REF | Output common-mode reference; default = V+/2; externally driven to shift output baseline for single-supply ADC interfacing. |
| 7 | OUT | Amplified, level-shifted output; drives ≥1kΩ loads directly; requires series resistor if driving >200pF capacitance. |
| 8 | SHDN | Active-low shutdown control; floating = active (2µA internal pull-up); driven to <0.5V = shutdown (<10µA quiescent). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Sensing | Outputs positive/negative voltage relative to REF to indicate current direction - eliminates need for dual amplifiers or polarity logic. |
| High CMRR | 96dB minimum over –5V to 80V CM range - rejects noise from noisy power rails in motor drives and SMPS. |
| FMEA-Aware Option Available | This part uses original pinout; FMEA-optimized variant (LT1999IMS8-10F#TRPBF) relocates NC to Pin 3 to prevent misconnection during assembly. |
| AEC-Q100 Qualified | Qualified to Grade I (–40°C to 85°C) - meets automotive reliability requirements for engine control, ADAS power stages, and EV subsystems. |
| Robust Input Protection | 4kV HBM / 1kV CDM ESD rating - withstands handling and board-level transients without latch-up or parametric shift. |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Monitoring bidirectional armature current in brushed DC or stepper motor drivers with PWM commutation. IC Role / Device Role / Timing Role: High-side or low-side current sense amplifier providing real-time feedback to PWM controller for torque regulation and overcurrent protection. Use Value: 2MHz bandwidth captures fast current transients during switching edges; ±0.5% gain accuracy enables precise stall detection and closed-loop speed control. | Use Scenario: Measuring energizing/de-energizing current in automotive fuel injectors, ABS valves, or industrial pneumatic actuators. IC Role / Device Role / Timing Role: Bidirectional current monitor interfaced to microcontroller ADC to verify solenoid activation timing and coil health. Use Value: –5V to 80V common mode range accommodates inductive kickback suppression circuits; 1.5mV offset ensures reliable detection of low hold-current states. |
| High Voltage Data Acquisition | PWM Control Loops |
Use Scenario: Digitizing current in 48V–72V battery management systems for EV auxiliary loads or telecom rectifiers. IC Role / Device Role / Timing Role: Precision analog front-end element converting shunt voltage to ADC-compatible output with programmable REF level. Use Value: REF pin flexibility allows output swing optimization for 12-bit or 16-bit SAR ADCs; 80dB AC CMRR at 100kHz suppresses switching noise coupling. | Use Scenario: Providing instantaneous current feedback in digitally controlled DC-DC converters operating at 200–1000kHz. IC Role / Device Role / Timing Role: Fast-settling current sense amplifier feeding current-mode PWM controller for cycle-by-cycle current limiting. Use Value: 2.5µs settling time to 0.5% ensures accurate peak current sampling; low 0.15Ω output impedance drives ADC input without buffer. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4080TASA+T | Unidirectional, 10V/V gain, 2.7V–76V supply, no REF pin, 250kHz bandwidth | Lacks bidirectional output and REF flexibility; limited to high-side-only sensing with external level-shifting | Select when unidirectional sensing suffices and system supply voltage exceeds 5V - avoids need for separate LDO. |
| INA240A1DGNR | Bidirectional, 20V/V gain, –4V to 80V CM, 4MHz bandwidth, integrated 2.5V REF, 100nV/√Hz noise | Higher bandwidth and lower noise but fixed 20V/V gain; REF not externally adjustable | Select when higher speed and lower noise are prioritized over gain flexibility and external REF control. |
Compared with MAX4080TASA+T and INA240A1DGNR, the LT1999IMS8-10#TRPBF uniquely combines user-configurable REF, true bidirectionality at 10V/V, AEC-Q100 qualification, and seamless operation across –5V to 80V common mode - making it optimal for automotive and industrial systems demanding design flexibility and proven reliability.
Availability
LT1999IMS8-10#TRPBF is available at Aetrix Electronics and suitable for H-bridge motor control, solenoid actuation, and high-voltage data acquisition requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for LT1999IMS8-10#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-voltage current sensing for safety-critical and high-reliability applications - designed specifically for motor control, battery management, and power conversion where accuracy, bandwidth, and ruggedness are non-negotiable.
FAQ
What is the maximum common mode voltage supported by the LT1999IMS8-10#TRPBF?
The LT1999IMS8-10#TRPBF supports an input common mode voltage range of –5V to 80V. This is verified per Absolute Maximum Ratings and Electrical Characteristics tables, with ESD clamps on +IN and –IN pins enabling safe operation up to –5.25V and 88V without triggering protection. Operation within –5V to 80V ensures full-spec performance including gain accuracy and CMRR.
Does the LT1999IMS8-10#TRPBF require external resistors for gain setting?
No, the LT1999IMS8-10#TRPBF has a fixed 10V/V gain implemented using precision laser-trimmed on-chip resistors (RG = 40kΩ, RIN = 4kΩ). No external gain-setting components are needed - simplifying layout and eliminating drift sources. Gain error remains within ±0.5% over temperature and supply variations.
Can the LT1999IMS8-10#TRPBF be used for low-side current sensing?
Yes, the LT1999IMS8-10#TRPBF supports both high-side and low-side current sensing configurations. Its wide –5V to 80V common mode range and bidirectional output allow direct connection to shunts placed on either side of the load. For low-side use, ensure GND is stable and REF is set appropriately to maintain output headroom.
What is the function of the REF pin on the LT1999IMS8-10#TRPBF?
The REF pin on the LT1999IMS8-10#TRPBF sets the output common-mode voltage level. By default, internal 160kΩ/160kΩ resistors bias it to V+/2 (~2.5V at 5V supply). It can be overdriven with an external voltage (1.25V to V+–1.25V) to shift the output baseline - enabling direct interfacing with single-supply ADCs or level-sensitive comparators without additional op-amps.
Is the LT1999IMS8-10#TRPBF pin-compatible with other gain variants like LT1999IMS8-20#TRPBF?
Yes, all LT1999IMS8-x variants - including LT1999IMS8-10#TRPBF, LT1999IMS8-20#TRPBF, and LT1999IMS8-50#TRPBF - share identical 8-lead MSOP packaging and pinout. Only the gain-setting resistor RG differs internally (40kΩ, 80kΩ, 200kΩ respectively), so PCB layouts are fully interchangeable across gain options.
LT1999IMS8-10#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
LT1999IMS8-10#TRPBF FAQ
1.How can I place an order for LT1999IMS8-10#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999IMS8-10#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 LT1999IMS8-10#TRPBF reliable?
The price and inventory of LT1999IMS8-10#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999IMS8-10#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1999IMS8-10#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999IMS8-10#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999IMS8-10#TRPBF?
LT1999IMS8-10#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999IMS8-10#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 LT1999IMS8-10#TRPBF?
For technical support, including LT1999IMS8-10#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999IMS8-10#TRPBF requirements.
6.How does Aetrix verify that LT1999IMS8-10#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1999IMS8-10#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 LT1999IMS8-10#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1999IMS8-10#TRPBF?
All LT1999IMS8-10#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999IMS8-10#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 LT1999IMS8-10#TRPBF part is unused and in its original packaging.
Return procedure for LT1999IMS8-10#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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