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Analog Devices Inc. LT1999IS8-50#PBF
- Part No.:
- LT1999IS8-50#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1999IS8-50#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:176
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Product details
Overview
LT1999IS8-50#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 50V/V fixed gain, –5V to 80V input common mode range, 1.2MHz small-signal bandwidth, and ±0.5% gain accuracy. It operates from a 4.5V–5.5V supply, draws 1.55mA quiescent current, and supports high-side or low-side sensing in H-bridge motor control and battery charge monitoring.
For engineers reviewing the LT1999IS8-50#PBF datasheet, LT1999IS8-50#PBF pinout, LT1999IS8-50#PBF application, or LT1999IS8-50#PBF equivalent, this page delivers verified electrical specs, SO-8 package terminal mapping, automotive-grade temperature performance (–40°C to 85°C), and real-world design context for precision current measurement in high-common-mode industrial and automotive systems.
Technical Context
The LT1999IS8-50#PBF uses matched on-chip resistor networks (R+IN/R–IN = 4kΩ each) and transconductance amplification to convert differential shunt voltage into an output-referred signal with minimal offset drift. Its internal REF bias network sets mid-supply common-mode level unless overridden externally.
Operation remains stable across full common mode range: below supply (–5V to V+) via D1-assisted biasing, and above supply (V+ to 80V) with fully off protection diodes. Common mode step recovery time is 1.3μs for ±50V transitions, supporting fast PWM-based current loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V fixed - enables precise 20mV full-scale shunt voltage to produce ±1V output swing. |
| Input CM Range | –5V to 80V - supports direct sensing in 48V battery systems, high-side MOSFET monitoring, and solenoid drivers without level-shifting. |
| Gain Accuracy | ±0.5% max - ensures ≤10mV error at ±1V output for 20mV sense voltage, critical for closed-loop current regulation. |
| Bandwidth | 1.2MHz - captures fast current transients in switching power supplies and PWM motor phases. |
| Supply Current | 1.55mA typical at VCM > 5.5V - enables low-power operation in always-on battery monitoring circuits. |
| Shutdown Current | <10μA - reduces system standby power when current sensing is inactive. |
| Operating Temp | –40°C to 85°C - qualified for industrial and automotive under-hood applications per I-grade specification. |
Pinout & Package
LT1999IS8-50#PBF is housed in an 8-lead plastic SO (narrow) package (S8), RoHS-compliant, with standard SOIC footprint (5.0mm × 4.0mm, 1.27mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 4) | Power supply input | Dual supply pins tied internally; accepts 4.5V–5.5V; supports 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 6.4kΩ–9.6kΩ differential impedance depending on gain option. |
| GND (Pin 5) | Ground reference | Return path for internal bias networks and external REF divider; not current-sense return. |
| REF (Pin 6) | Output common-mode reference | Sets VOUT midpoint; default = V+/2 via internal 160k/160k divider; adjustable within 1.125V to V+–1.125V. |
| OUT (Pin 7) | Amplified output | Low-impedance (0.15Ω) rail-to-rail capable output; drives ≥200pF directly; requires series R for larger capacitive loads. |
| SHDN (Pin 8) | Shutdown control | Active-low logic input; ≤0.5V disables amplifier; floating or >V+–0.5V enables; internal 2μA pull-up ensures default active state. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Outputs positive/negative voltage relative to REF to indicate current direction through shunt resistor. |
| FMEA-optimized pinout option available | Separate MSOP variant (LT1999IS8-50F#PBF) relocates NC to Pin 3 to prevent misconnection-induced failure modes. |
| High ESD robustness | 4kV HBM / 1kV CDM tolerance - enhances reliability in manufacturing and field-deployed industrial environments. |
| Smooth CM transition | No gain or offset discontinuity across –5V to 80V range - eliminates calibration gaps in wide-dynamic-range systems. |
| AEC-Q100 qualified | Validated for automotive applications (H-grade variants); I-grade LT1999IS8-50#PBF meets same reliability testing protocols. |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Monitoring phase current in brushed DC or stepper motor drivers with PWM switching up to 100kHz. IC Role / Device Role / Timing Role: Bidirectional current amplifier referenced to mid-supply, providing real-time magnitude/direction feedback to MCU ADC. Use Value: Enables torque control and overcurrent protection with 1.2MHz bandwidth capturing edge transients and ±0.5% gain accuracy ensuring consistent loop gain across temperature. | Use Scenario: Measuring energizing/de-energizing current in automotive fuel injectors or industrial pneumatic valves. IC Role / Device Role / Timing Role: High-CMRR current sensor interfacing between 12V/24V solenoid supply and 3.3V/5V controller ADC. Use Value: –5V to 80V common mode range accommodates back-EMF spikes; 1.3μs CM recovery prevents false triggering during rapid turn-off events. |
| High Voltage Data Acquisition | PWM Control Loops |
Use Scenario: Isolated current measurement in 48V server PSUs or telecom rectifiers where shunt sits at elevated potential. IC Role / Device Role / Timing Role: Precision analog front-end converting mV-level shunt voltage to buffered, referenced output compatible with SAR ADC inputs. Use Value: 96dB CMRR at DC and 80dB at 100kHz suppresses noise from switching nodes; 50V/V gain maximizes ADC dynamic range utilization. | Use Scenario: Real-time current feedback in digital power controllers managing synchronous buck converters. IC Role / Device Role / Timing Role: Fast-settling (2.5μs to 0.5%) current sense amplifier feeding ADC sampling synchronized to PWM edges. Use Value: 1.2MHz bandwidth and 3V/μs slew rate preserve signal fidelity during duty-cycle transitions; shutdown mode reduces idle power in burst-mode operation. |
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 | 50V/V gain, –4V to 80V CM range, 4.5V–5.5V supply, but only 0.4MHz bandwidth and no internal REF divider. | Requires external REF circuitry; lower bandwidth limits use in >200kHz PWM systems. | Select when cost sensitivity outweighs need for high-speed transient capture and integrated REF biasing. |
| MAX40056ASA+T | 50V/V gain, –5V to 65V CM range, 2.8V–5.5V supply, 1.5MHz bandwidth, but only specified for –40°C to 125°C (H-grade) and lacks AEC-Q100 validation. | Not qualified for automotive; narrower CM range excludes 80V battery monitoring. | Select for wider supply range and higher bandwidth in non-automotive industrial designs where 80V CM is not required. |
Compared with INA240A1QDRQ1 and MAX40056ASA+T, the LT1999IS8-50#PBF uniquely combines automotive-grade reliability (I-grade), integrated mid-supply REF biasing, and smooth –5V–80V common mode operation-making it optimal for safety-critical, high-CM, and thermally demanding current sensing where precision and continuity matter.
Availability
LT1999IS8-50#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, solenoid actuation, and high-voltage data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1999IS8-50#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 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 applications including motor control, power conversion, and battery management-designed specifically for robust operation in noisy, high-CM, and thermally variable environments.
FAQ
What is the maximum common mode voltage supported by the LT1999IS8-50#PBF?
The LT1999IS8-50#PBF supports an input common mode voltage range of –5V to 80V, verified across its full operating temperature range (–40°C to 85°C). This allows direct connection to high-side shunts in 48V battery systems and industrial 72V rails without external level-shifting circuitry. The device maintains specified gain accuracy and CMRR throughout this range.
Does the LT1999IS8-50#PBF require external components to set the output reference voltage?
No-the LT1999IS8-50#PBF includes an internal 160kΩ/160kΩ resistive divider that biases the REF pin at V+/2 by default. This provides a stable mid-supply reference for bidirectional output swing. An external voltage can override REF within 1.125V to V+–1.125V if system-level level-shifting is needed, but no external components are required for basic operation.
How does the LT1999IS8-50#PBF handle common mode transients in PWM applications?
The LT1999IS8-50#PBF recovers from ±50V common mode steps (20ns rise/fall) in 1.3μs while maintaining DC amplifier specifications. This fast recovery-combined with 80dB AC CMRR at 100kHz-ensures accurate current measurement during rapid switching events in H-bridge and buck converter topologies without output corruption or settling errors.
Is the LT1999IS8-50#PBF pin-compatible with other gain versions in the LT1999 family?
Yes-the LT1999IS8-50#PBF shares identical SO-8 pinout, electrical interface, and functional behavior with LT1999IS8-10#PBF and LT1999IS8-20#PBF. Only the internal gain-setting resistor (RG = 200kΩ for 50V/V) differs; all other pins, timing, supply, and shutdown behavior are identical, enabling drop-in gain selection during design iteration.
What is the typical supply current of the LT1999IS8-50#PBF under active operation?
The LT1999IS8-50#PBF draws 1.55mA typical supply current when VCM > 5.5V and V+ = 5V. At VCM = –5V, current increases to 5.8mA due to internal biasing circuit activation. In shutdown mode (SHDN ≤ 0.5V), supply current drops below 10μA-enabling ultra-low-power operation in battery-backed or intermittent-sensing applications.
LT1999IS8-50#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:
- 1.2 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
LT1999IS8-50#PBF FAQ
1.How can I place an order for LT1999IS8-50#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999IS8-50#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 LT1999IS8-50#PBF reliable?
The price and inventory of LT1999IS8-50#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999IS8-50#PBF is usually 5 days.
3.What payment methods are accepted for LT1999IS8-50#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999IS8-50#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999IS8-50#PBF?
LT1999IS8-50#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999IS8-50#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 LT1999IS8-50#PBF?
For technical support, including LT1999IS8-50#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999IS8-50#PBF requirements.
6.How does Aetrix verify that LT1999IS8-50#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999IS8-50#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 LT1999IS8-50#PBF meets industry standards.
7.What is the process for return or replacement of LT1999IS8-50#PBF?
All LT1999IS8-50#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999IS8-50#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 LT1999IS8-50#PBF part is unused and in its original packaging.
Return procedure for LT1999IS8-50#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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