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Analog Devices Inc. LT1999IS8-10#PBF
- Part No.:
- LT1999IS8-10#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1999IS8-10#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT1999IS8-10#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 sensing in motor control, battery monitoring, and PWM power stages.
For engineers reviewing the LT1999IS8-10#PBF datasheet, LT1999IS8-10#PBF pinout, LT1999IS8-10#PBF application, or LT1999IS8-10#PBF equivalent, this device delivers precision bidirectional current measurement under wide voltage transients, high CMRR (>96dB), and automotive-grade reliability (–40°C to 85°C) in an industry-standard 8-lead SO package.
Technical Context
The LT1999IS8-10#PBF uses a matched resistor-input transconductance architecture with internal 4kΩ differential input impedance and on-chip 40kΩ gain-setting resistor (RG), enabling accurate 10× amplification of shunt voltage without external components. Its REF pin allows flexible output common-mode level setting-either mid-supply via internal 160k/160k divider or externally driven.
It features seamless operation across its full –5V to 80V common mode range: above V+, D1 remains off; below V+, D1 conducts to bias GIN inputs ≥2.25V above GND. This ensures continuous gain and offset stability during rail-crossing events, critical for H-bridge and solenoid drive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V ±0.5% - enables direct scaling of 100mV shunt drop to 1V 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 circuits |
| Bandwidth | 2MHz - captures fast current transients in PWM switching (e.g., 500kHz+ gate drivers) |
| Input Offset Voltage | ±1.5mV max - limits error to ≤15μV at 10× gain, critical for sub-amp precision sensing |
| Supply Current | 1.55mA active, <10µA shutdown - enables always-on monitoring with ultra-low standby power |
| CMRR | 96dB min (DC), >80dB at 100kHz - rejects noise from noisy power rails in motor drives |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive I-grade environments |
Pinout & Package
LT1999IS8-10#PBF is housed in an 8-lead plastic SO (narrow) package (S8), RoHS-compliant, with standard SOIC footprint and 1.27mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 4) | Power Supply Input | Internally tied pins accepting 4.5V–5.5V; dual connection improves PSRR and thermal stability |
| +IN (Pin 2) | Positive Sense Input | Differential input referenced to –IN; matched 4kΩ impedance enables precise shunt voltage capture |
| –IN (Pin 3) | Negative Sense Input | Completes differential pair; ESD-protected to ±5.25V below GND and up to 88V above GND |
| GND (Pin 5) | Analog Ground Reference | Return path for REF divider and output stage; separate from power ground in layout-critical designs |
| REF (Pin 6) | Output Common-Mode Reference | Sets OUT midpoint; default = V+/2; externally overdrivable within 1.25V to (V+ – 1.25V) |
| OUT (Pin 7) | Amplified Output | Low-impedance (0.15Ω), rail-to-rail capable; drives ≤200pF directly; requires series R for larger capacitive loads |
| SHDN (Pin 8) | Shutdown Control | Active-low logic input; <0.5V = shutdown (<10µA); floating or >V+–0.5V = active; internal 2µA pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Sensing | Outputs positive/negative voltage relative to REF to indicate current direction-no external polarity inversion needed |
| FMEA-Optimized Pinout Option | Available in MSOP-FMEA variant (LT1999IS8-10F#PBF); pin 3 = NC instead of –IN to prevent short-circuit failure modes |
| Robust ESD Protection | 4kV HBM / 1kV CDM rated-survives handling and board-level transients without derating |
| Fast Common-Mode Recovery | 0.8µs recovery from ±50V CM step-maintains accuracy during rapid bus voltage transitions in inverters |
| AEC-Q100 Qualified | Qualified per AEC-Q100 Rev G for automotive use-validates reliability for engine control, ADAS, and battery management |
Applications
| H-Bridge Motor Control | Solenoid Current Monitoring |
|---|---|
Use Scenario: Real-time phase current measurement in 24V/48V brushed or BLDC motor drivers with regenerative braking. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier placed on low-side shunt; outputs polarity-coded signal to MCU ADC for torque and commutation control. Use Value: 2MHz bandwidth resolves PWM ripple; ±0.5% gain error ensures <1% current loop error across temperature; –5V to 80V CM range accommodates shoot-through and flyback spikes. | Use Scenario: Monitoring coil current in automotive fuel injectors or industrial pneumatic valves with fast turn-on/turn-off cycles. IC Role / Device Role / Timing Role: High-speed current monitor on solenoid return path; provides real-time feedback for closed-loop current limiting and stall detection. Use Value: 0.8µs common-mode recovery prevents false triggering during inductive kick; 1.55mA quiescent current enables always-on diagnostics without battery drain. |
| Battery Charge/Discharge Monitoring | PWM Power Stage Feedback |
Use Scenario: Bidirectional current sensing in Li-ion battery packs for state-of-charge (SoC) and health (SoH) estimation across charge/discharge cycles. IC Role / Device Role / Timing Role: Precision shunt amplifier between battery terminal and load/charger; REF tied to mid-supply to center output swing for single-supply ADCs. Use Value: ±1.5mV offset ensures <150μV error at 10× gain-critical for µA-level leakage detection; –40°C to +85°C rating supports wide ambient operation. | Use Scenario: Current feedback in synchronous buck/boost converters for peak-current-mode control and overcurrent protection. IC Role / Device Role / Timing Role: Fast-response current sense element on high-side or low-side MOSFET shunt; interfaces directly with PWM controller's current sense input. Use Value: 2MHz bandwidth captures switching-edge current peaks; 96dB DC CMRR rejects gate-drive coupling noise; shutdown pin enables dynamic power gating during light-load modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1DR | 20V/V gain (fixed), 80V CM range, 4.5V–5.5V supply, but only 0.5MHz bandwidth and no REF pin flexibility | Lacks programmable output common-mode; limited to unidirectional or dual-supply configurations unless external level-shifting added | Select when cost-sensitive, lower-bandwidth (<250kHz) sensing suffices and REF flexibility is unnecessary |
| MAX40056ATA+ | 10V/V gain, 65V CM range, 2.7V–5.5V supply, 2.5MHz bandwidth, but only –40°C to +125°C (H-grade) and no AEC-Q100 qualification | Higher bandwidth but narrower CM range; not automotive-qualified; different pinout (8-pin TDFN) | Select for wider supply range or higher speed where automotive compliance is not required |
Compared with INA240A1DR and MAX40056ATA+, the LT1999IS8-10#PBF uniquely combines AEC-Q100 qualification, REF pin configurability for single-supply ADC interfacing, and guaranteed 2MHz bandwidth across –40°C to +85°C-making it optimal for automotive motor control and industrial power conversion where precision, robustness, and design flexibility are jointly critical.
Availability
LT1999IS8-10#PBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive battery management systems, and high-reliability power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1999IS8-10#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 product line delivers high-voltage, high-accuracy current sensing for demanding power electronics applications-including H-bridge control, battery monitoring, and fault-tolerant power systems-where wide common-mode range and bidirectional capability are essential.
FAQ
What is the maximum common mode voltage the LT1999IS8-10#PBF can handle?
The LT1999IS8-10#PBF supports a continuous input common mode voltage range of –5V to +80V. This is verified per Absolute Maximum Ratings and Electrical Characteristics tables, enabling safe operation in 48V industrial buses and high-side sensing in systems with transient overvoltages. Operation beyond these limits risks permanent damage or degraded performance.
Does the LT1999IS8-10#PBF require external resistors to set gain?
No, the LT1999IS8-10#PBF has a fixed 10V/V gain implemented with internal matched resistors (RIN = 4kΩ, RG = 40kΩ). No external gain-setting components are needed-simplifying layout, reducing BOM count, and ensuring consistent accuracy across units and temperature.
Can the LT1999IS8-10#PBF be used in automotive applications?
Yes, the LT1999IS8-10#PBF is AEC-Q100 qualified for automotive applications and specified over –40°C to +85°C (I-grade). Its 4kV HBM ESD rating, robust common-mode step recovery (0.8µs), and guaranteed performance across temperature make it suitable for engine control modules, battery disconnect units, and ADAS power stages.
How does the REF pin function in the LT1999IS8-10#PBF?
The REF pin in the LT1999IS8-10#PBF sets the output common-mode voltage. By default, it floats at V+/2 via internal 160k/160k resistors. It can be overdriven externally within 1.25V to (V+ – 1.25V) to shift the output baseline-enabling direct interface with single-supply ADCs or level-matching to downstream circuitry without external op-amps.
What is the shutdown current consumption of the LT1999IS8-10#PBF?
In shutdown mode (SHDN pin ≤ 0.5V), the LT1999IS8-10#PBF draws less than 10µA typical supply current. This ultra-low standby power enables energy-efficient always-on monitoring in battery-powered systems, such as portable medical devices or remote IoT sensors, while maintaining fast wake-up (<1µs turn-on time).
LT1999IS8-10#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SO
LT1999IS8-10#PBF FAQ
1.How can I place an order for LT1999IS8-10#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999IS8-10#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 LT1999IS8-10#PBF reliable?
The price and inventory of LT1999IS8-10#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999IS8-10#PBF is usually 5 days.
3.What payment methods are accepted for LT1999IS8-10#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999IS8-10#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999IS8-10#PBF?
LT1999IS8-10#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999IS8-10#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 LT1999IS8-10#PBF?
For technical support, including LT1999IS8-10#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999IS8-10#PBF requirements.
6.How does Aetrix verify that LT1999IS8-10#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999IS8-10#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 LT1999IS8-10#PBF meets industry standards.
7.What is the process for return or replacement of LT1999IS8-10#PBF?
All LT1999IS8-10#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999IS8-10#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 LT1999IS8-10#PBF part is unused and in its original packaging.
Return procedure for LT1999IS8-10#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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