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Analog Devices Inc. LT1999IMS8-10#PBF
- Part No.:
- LT1999IMS8-10#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999IMS8-10#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:293
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Product details
Overview
LT1999IMS8-10#PBF 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 operates from a 4.5V–5.5V supply, draws 1.55mA, and supports high-side or low-side shunt monitoring in H-bridge motor controls and battery charge/discharge systems.
For engineers reviewing the LT1999IMS8-10#PBF datasheet, LT1999IMS8-10#PBF pinout, LT1999IMS8-10#PBF application, or LT1999IMS8-10#PBF equivalent, this device delivers precision bidirectional current sensing with FMEA-optimized MSOP packaging, automotive-grade temperature support (–40°C to 85°C), and robust 4kV HBM ESD tolerance - critical for industrial power conversion and automotive subsystems.
Technical Context
The LT1999IMS8-10#PBF employs a matched resistor-based transconductance architecture with internal 4kΩ differential input impedance and on-chip 40kΩ gain-setting resistor (RG), enabling accurate VOUT = 10 × (V+IN – V–IN) + VREF translation. Its dual-path biasing (D1 conduction below V+, high-impedance operation above V+) ensures smooth, continuous operation across the full –5V to 80V common mode range without gain discontinuity or offset shift.
It features a mid-supply reference architecture via internal 160kΩ/160kΩ divider at REF (Pin 6), allowing output level shifting; the REF pin accepts external voltage inputs within 1.25V to (V+ – 1.25V). Shutdown control (SHDN, Pin 8) reduces supply current to <10µA while maintaining fast 1µs turn-on/turn-off timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V ±0.5% - enables direct scaling of ±350mV shunt voltage to ±3.5V output for ADC interfacing with minimal calibration. |
| Common Mode Range | –5V to 80V - supports high-side sensing in 48V/60V industrial buses and low-side sensing in negative-rail solenoid drivers. |
| Bandwidth | 2MHz - captures fast transient currents in PWM-controlled motor phases and switching power supply loops. |
| Input Offset Voltage | ±1.5mV max - limits current measurement error to ≤±0.15% FS at 10V/V gain, critical for precision battery coulomb counting. |
| Supply Current | 1.55mA active, <10µA shutdown - enables always-on monitoring with ultra-low quiescent power in energy-sensitive applications. |
| CMRR | ≥96dB over –5V to 80V CM range - rejects noise from noisy power rails during high-dV/dt switching events. |
| Operating Temp | –40°C to 85°C (I-grade) - qualified for under-hood automotive modules and industrial PLC I/O cards. |
Pinout & Package
LT1999IMS8-10#PBF uses an 8-lead MSOP package (3mm × 3mm, 0.65mm pitch) with original pinout (non-FMEA variant), RoHS-compliant lead-free finish, and specified operating junction temperature up to 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 4) | Positive Supply Input | Internally tied pins accepting 4.5V–5.5V; supports partial operation down to ~4V but not characterized below 4.5V. |
| +IN (Pin 2) | Positive Sense Input | Differential input connected to high-side of shunt; protected to –5.25V/88V CM with asymmetric ESD clamps. |
| –IN (Pin 3) | Negative Sense Input | Differential input connected to low-side of shunt; matched to +IN for <0.5% gain error and high CMRR. |
| GND (Pin 5) | Analog Ground Reference | Return path for REF divider and internal bias networks; must be low-impedance connection to system ground plane. |
| REF (Pin 6) | Output Common-Mode Reference | Sets VOUT midpoint; default = V+/2 via internal resistors; externally overdrivable between 1.25V and (V+ – 1.25V). |
| OUT (Pin 7) | Amplified Output | Low-impedance (0.15Ω) rail-to-rail output; drives ≤200pF directly; requires ≥100Ω series resistor for larger capacitive loads. |
| SHDN (Pin 8) | Shutdown Control | Active-low logic input; <0.5V = shutdown (<10µA IS); floating or >V+–0.5V = active; internal 2µA pull-up ensures default ON state. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Sensing | Outputs polarity-reversed voltage proportional to current direction - enables real-time charge/discharge state detection in battery management. |
| FMEA-Optimized Pinout Option Available | Separate MSOP variant (LT1999IMS8-10F#PBF) relocates NC to Pin 3 to prevent misconnection-induced latch-up in safety-critical systems. |
| High CMRR at 100kHz | >80dB AC CMRR at 100kHz - maintains accuracy in presence of high-frequency switching noise from adjacent MOSFETs or gate drivers. |
| Robust ESD Rating | 4kV HBM / 1kV CDM - withstands handling and board-level ESD events without functional degradation or parameter shift. |
| Wide Temperature Operation | Specified performance from –40°C to 85°C - eliminates derating concerns in industrial enclosures and automotive cabin environments. |
Applications
| H-Bridge Motor Control | Solenoid Current Monitoring |
|---|---|
|
Use Scenario: Real-time phase current measurement in BLDC motor drivers using high-side shunts. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier converting shunt voltage to amplified, level-shifted analog output synchronized with PWM switching. Use Value: Enables precise torque control and overcurrent protection with 2MHz bandwidth capturing sub-microsecond current transients during commutation. |
Use Scenario: Monitoring inductive pull-in and hold currents in automotive fuel injectors or ABS solenoids. IC Role / Device Role / Timing Role: High CMRR current sensor rejecting flyback voltage spikes and ensuring stable DC hold-current feedback. Use Value: Delivers ±0.5% gain accuracy over –40°C to 85°C, enabling reliable solenoid health diagnostics and duty-cycle optimization. |
| Battery Charge/Discharge Monitoring | PWM Power Supply Loop Sensing |
|
Use Scenario: Coulomb counting in 12V/48V battery packs with shared shunt for charge and discharge paths. IC Role / Device Role / Timing Role: Precision bidirectional amplifier generating signed output voltage referenced to mid-supply for ADC input. Use Value: ±1.5mV input offset ensures <±0.15% full-scale error at 10V/V gain, improving state-of-charge estimation accuracy over lifetime. |
Use Scenario: Current-mode control feedback in synchronous buck converters operating at 500kHz–1MHz. IC Role / Device Role / Timing Role: Fast-settling (2.5µs to 0.5%) current sense amplifier feeding error amplifier in voltage regulation loop. Use Value: 2MHz bandwidth and 0.8µs common-mode step recovery maintain loop stability during rapid load transients and rail switching. |
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+ | 10V/V gain, 2.5MHz bandwidth, 2.7V–76V CM range, but only 85°C max ambient rating (no I-grade option). | Lacks AEC-Q100 qualification and FMEA pinout variants; limited to commercial/industrial use. | Select when wider supply range (2.7V) or higher bandwidth is prioritized over automotive qualification and extended temp support. |
| INA240A1DR | 10V/V gain, 4V–80V CM range, 1.1MHz bandwidth, ±20µV offset, but requires external REF and has no integrated mid-supply divider. | Higher precision offset but slower response; lacks internal REF buffer and shutdown pin - needs external logic. | Select when ultra-low offset (<±20µV) dominates design requirements and board space allows external REF circuitry. |
Compared with MAX4080TASA+ and INA240A1DR, the LT1999IMS8-10#PBF uniquely combines AEC-Q100 I-grade qualification, integrated mid-supply REF, true shutdown control, and FMEA-compatible packaging - making it optimal for automotive and safety-aware industrial current monitoring where reliability and layout simplicity are critical.
Availability
LT1999IMS8-10#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, battery management systems, and industrial solenoid actuation requiring stable component supply across automotive and industrial production lifecycles.
Supply support for LT1999IMS8-10#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 family was designed specifically for high-voltage, high-accuracy bidirectional current sensing in demanding power conversion and motor control applications - emphasizing wide common mode range, fast transient response, and robust operation in electrically noisy environments.
FAQ
What is the maximum common mode voltage the LT1999IMS8-10#PBF can handle?
The LT1999IMS8-10#PBF 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 protecting Pins 2 and 3 to –5.25V and 88V respectively. Operation beyond 80V common mode is not guaranteed and may degrade performance or reliability.
Does the LT1999IMS8-10#PBF require external components for basic operation?
Yes - the LT1999IMS8-10#PBF requires two 0.1µF bypass capacitors (V+ to GND), and its REF pin defaults to mid-supply via internal 160kΩ resistors. For improved noise immunity, a 0.1µF capacitor from REF to GND is recommended. No external gain-setting resistors are needed, as RG is integrated on-die for the 10V/V variant.
Can the LT1999IMS8-10#PBF be used in automotive applications?
Yes - the LT1999IMS8-10#PBF is rated for –40°C to 85°C operation and is explicitly listed in the datasheet as AEC-Q100 qualified for automotive applications. Its 4kV HBM ESD rating, wide common mode range, and FMEA-optimized pinout option (LT1999IMS8-10F#PBF) further support deployment in engine control, body electronics, and ADAS subsystems.
How does the shutdown feature work on the LT1999IMS8-10#PBF?
The SHDN pin (Pin 8) is active-low: pulling it to <0.5V places the LT1999IMS8-10#PBF into shutdown mode, reducing supply current to <10µA. When left floating, an internal 2µA pull-up current source biases SHDN high, enabling normal operation. Turn-on and turn-off times are each ≤1µs, supporting rapid power cycling in burst-mode systems.
What is the typical output swing capability of the LT1999IMS8-10#PBF?
The LT1999IMS8-10#PBF delivers rail-to-rail output swing: with a 5V supply, it achieves ≥4.75V (V+ – 250mV) high output and ≤250mV low output into a 1kΩ load referenced to mid-supply. Sourcing/sinking capability is 6mA/15mA minimum, supporting direct interface to SAR ADCs and comparator inputs without buffering.
LT1999IMS8-10#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:
- -
- 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#PBF FAQ
1.How can I place an order for LT1999IMS8-10#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999IMS8-10#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 LT1999IMS8-10#PBF reliable?
The price and inventory of LT1999IMS8-10#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999IMS8-10#PBF is usually 5 days.
3.What payment methods are accepted for LT1999IMS8-10#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999IMS8-10#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999IMS8-10#PBF?
LT1999IMS8-10#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999IMS8-10#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 LT1999IMS8-10#PBF?
For technical support, including LT1999IMS8-10#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999IMS8-10#PBF requirements.
6.How does Aetrix verify that LT1999IMS8-10#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999IMS8-10#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 LT1999IMS8-10#PBF meets industry standards.
7.What is the process for return or replacement of LT1999IMS8-10#PBF?
All LT1999IMS8-10#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999IMS8-10#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 LT1999IMS8-10#PBF part is unused and in its original packaging.
Return procedure for LT1999IMS8-10#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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