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Analog Devices Inc. LT1999IS8-10#TRPBF
- Part No.:
- LT1999IS8-10#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1999IS8-10#TRPBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,456
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Product details
Overview
LT1999IS8-10#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 operates from a 4.5V–5.5V supply, draws 1.55mA, and supports high-side or low-side sensing in H-bridge motor controls and battery charge monitoring.
For engineers reviewing the LT1999IS8-10#TRPBF datasheet, LT1999IS8-10#TRPBF pinout, LT1999IS8-10#TRPBF application, or LT1999IS8-10#TRPBF equivalent, this device delivers precision bidirectional current measurement with FMEA-optimized SO-8 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 LT1999IS8-10#TRPBF uses matched internal resistor networks (R+IN/R–IN = 4kΩ each) and transconductance amplification to convert differential shunt voltage into an output referenced to the REF pin. Its architecture enables smooth, continuous operation across the full –5V to 80V common mode range without gain or offset discontinuity.
It features a dedicated SHDN pin with 1µs turn-on/off timing, internal 2µA pull-up, and shutdown current <10µA. The REF pin accepts external bias (1.5V to V+–1.25V) or defaults to mid-supply via internal 160kΩ dividers, enabling flexible output level shifting for ADC interfacing or comparator thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V fixed - provides precise scaling of shunt voltage to measurable output (e.g., ±350mV input → ±3.5V output). |
| Common Mode Range | –5V to 80V - enables direct sensing in high-voltage DC bus, battery packs, and industrial solenoid drivers without level-shifting circuitry. |
| Bandwidth | 2MHz - supports accurate current capture in fast-switching PWM control loops and motor phase current reconstruction. |
| Gain Accuracy | ±0.5% max - ensures reliable current magnitude determination over temperature and supply variation for closed-loop protection. |
| Input Offset Voltage | ±1.5mV max - limits zero-current error to ≤±15µA on a 10mΩ shunt, critical for low-current battery state-of-charge estimation. |
| Supply Current | 1.55mA typical at VCM > 5.5V - enables low-power operation in always-on monitoring systems with minimal thermal impact. |
| Shutdown Current | <10µA - allows system-level power gating during sleep modes without compromising wake-up latency (1µs tON). |
Pinout & Package
LT1999IS8-10#TRPBF is housed in an 8-lead plastic SO (narrow) package (S8), RoHS-compliant, with standard SOIC footprint and 1.27mm lead pitch. Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 4) | Power supply input | Dual-supply pins tied internally; accept 4.5V–5.5V; support operation down to ~4V (unspecified). |
| +IN (Pin 2) | Positive sense input | High-impedance node (≥5MΩ at VCM > 5.5V); connects to high-side of shunt resistor. |
| –IN (Pin 3) | Negative sense input | Matched to +IN; forms differential pair with ±0.5% gain error budget; ESD-protected to ±5.25V/88V. |
| GND (Pin 5) | Ground reference | Return path for internal bias and REF divider; must be low-impedance for CMRR integrity. |
| REF (Pin 6) | Output common-mode reference | Sets output midpoint; can be externally driven (1.5V to V+–1.25V) or left floating for default 2.5V (at V+ = 5V). |
| OUT (Pin 7) | Amplified output | Low-impedance (0.15Ω) rail-to-rail capable output; drives ≥200pF directly; requires series R ≥100Ω for larger capacitive loads. |
| SHDN (Pin 8) | Active-low shutdown control | Pulled low (<0.5V) to enter shutdown (<10µA); floating or pulled high places device in active mode via internal 2µA pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Outputs polarity-reversed voltage for reverse current flow - enables real-time charge/discharge monitoring in battery management. |
| FMEA-optimized pinout compatibility | SO-8 package matches industry-standard layout (not FMEA variant); avoids misrouting in safety-critical designs requiring traceable pin assignment. |
| Automotive qualification | AEC-Q100 qualified (I-grade: –40°C to 85°C) - validated for under-hood and chassis electronics with guaranteed performance over full temp range. |
| High common-mode step recovery | 0.8µs recovery from ±50V CM transient - maintains accuracy during fast switching events in motor drive half-bridges. |
| Robust ESD tolerance | 4kV HBM / 1kV CDM - reduces field failure risk in manufacturing and end-equipment handling without external protection. |
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 shutdown. Use Value: Enables precise stall detection and dynamic braking using same shunt; 2MHz bandwidth captures current ripple without phase lag. | Use Scenario: Measuring energizing/de-energizing current in automotive fuel injectors or industrial pneumatic valves. IC Role / Device Role / Timing Role: Bidirectional analog front-end converting solenoid coil current into voltage for microcontroller ADC sampling. Use Value: ±0.5% gain accuracy ensures consistent pulse-width-to-force mapping; –5V to 80V CM range accommodates flyback voltage spikes. |
| Battery Charge/Discharge Monitoring | PWM Power Supply Current Sensing |
Use Scenario: Full-range current tracking in Li-ion battery packs from charging (positive current) to load discharge (negative current). IC Role / Device Role / Timing Role: Precision current transducer feeding coulomb counting algorithm in battery fuel gauge IC or MCU. Use Value: Input offset ≤±1.5mV minimizes zero-current drift; wide temperature range (–40°C to 85°C) ensures accuracy across environmental conditions. | Use Scenario: Real-time phase current sensing in synchronous buck or boost converters operating at >500kHz switching frequency. IC Role / Device Role / Timing Role: High-bandwidth current monitor placed on low-side shunt to provide feedback for adaptive duty-cycle control. Use Value: 2MHz small-signal bandwidth preserves fast current transients; 80dB AC CMRR at 100kHz rejects switching noise coupling onto sense lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | 20V/V gain, 4V to 80V CM range, 105dB DC CMRR, SO-8 package | Higher CMRR improves noise immunity in noisy SMPS; lacks REF pin flexibility and 4kV HBM rating | Select when ultra-high DC rejection is prioritized over programmable output offset and automotive ESD robustness. |
| MAX40056ATA+T | 10V/V gain, –0.2V to 65V CM range, 1.5MHz bandwidth, 8-pin TDFN | Narrower CM range excludes 80V bus applications; smaller package limits thermal dissipation in high-current designs | Choose for space-constrained PCBs where 65V max CM suffices and TDFN assembly is supported. |
Compared with INA240A1IDR and MAX40056ATA+T, the LT1999IS8-10#TRPBF uniquely combines 80V common mode capability, REF pin configurability for custom output offsets, and AEC-Q100 qualification - making it optimal for automotive H-bridge and industrial 48V/60V battery systems requiring both precision and reliability.
Availability
LT1999IS8-10#TRPBF is available at Aetrix Electronics and suitable for H-bridge motor control, battery management systems, and industrial solenoid drivers requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for LT1999IS8-10#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 high-voltage, high-accuracy current sensing for demanding power electronics applications - specifically engineered for bidirectional monitoring in motor drives, battery systems, and industrial automation where wide common mode range and fast transient response are essential.
FAQ
What is the maximum common mode voltage the LT1999IS8-10#TRPBF can handle?
The LT1999IS8-10#TRPBF supports an input common mode voltage range of –5V to 80V. This allows direct connection to high-voltage rails such as 48V, 60V, or 80V battery systems and industrial DC buses without external level-shifting circuitry. Absolute maximum ratings extend to –5.25V and 88V for short-duration transients.
Does the LT1999IS8-10#TRPBF require external resistors for gain setting?
No, the LT1999IS8-10#TRPBF has a fixed 10V/V gain implemented with precision on-chip resistors. Unlike programmable current sense amplifiers, it requires no external gain-setting components - simplifying layout, reducing BOM count, and eliminating resistor tolerance-induced errors in the LT1999IS8-10#TRPBF signal chain.
How does the REF pin function in the LT1999IS8-10#TRPBF?
The REF pin sets the output common-mode voltage of the LT1999IS8-10#TRPBF. When left unconnected, internal 160kΩ resistors bias it to mid-supply (e.g., 2.5V at V+ = 5V). It can also be driven externally within 1.5V to V+–1.25V to shift the output baseline - enabling direct interfacing with ADCs or comparators requiring non-mid-rail reference points.
Is the LT1999IS8-10#TRPBF suitable for automotive applications?
Yes, the LT1999IS8-10#TRPBF is AEC-Q100 qualified (I-grade) and specified for operation from –40°C to 85°C. Its 4kV HBM ESD rating, robust common mode transient immunity, and guaranteed performance across temperature make it suitable for automotive body control modules, battery disconnect units, and electric power steering current sensing in the LT1999IS8-10#TRPBF design.
What is the typical supply current and shutdown behavior of the LT1999IS8-10#TRPBF?
The LT1999IS8-10#TRPBF draws 1.55mA typical supply current in active mode and less than 10µA in shutdown mode. The SHDN pin is active-low: pulling it below 0.5V initiates shutdown with 1µs turn-off time; leaving it floating enables operation via internal 2µA pull-up. This allows low-power system states without external pull-up resistors in the LT1999IS8-10#TRPBF implementation.
LT1999IS8-10#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SO
LT1999IS8-10#TRPBF FAQ
1.How can I place an order for LT1999IS8-10#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999IS8-10#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 LT1999IS8-10#TRPBF reliable?
The price and inventory of LT1999IS8-10#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999IS8-10#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1999IS8-10#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999IS8-10#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999IS8-10#TRPBF?
LT1999IS8-10#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999IS8-10#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 LT1999IS8-10#TRPBF?
For technical support, including LT1999IS8-10#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999IS8-10#TRPBF requirements.
6.How does Aetrix verify that LT1999IS8-10#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1999IS8-10#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 LT1999IS8-10#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1999IS8-10#TRPBF?
All LT1999IS8-10#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999IS8-10#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 LT1999IS8-10#TRPBF part is unused and in its original packaging.
Return procedure for LT1999IS8-10#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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