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Analog Devices Inc. LT1999HS8-50#PBF
- Part No.:
- LT1999HS8-50#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1999HS8-50#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,059
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Product details
Overview
LT1999HS8-50#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with fixed 50V/V gain, –5V to 80V input common mode range, 1.2MHz small-signal bandwidth, ±0.5% gain accuracy, and operation over –40°C to 125°C. It senses current via external shunt resistor and outputs a voltage referenced to mid-supply or external REF, enabling precise bidirectional monitoring in H-bridge motor controls and battery charge/discharge systems.
For engineers reviewing the LT1999HS8-50#PBF datasheet, LT1999HS8-50#PBF pinout, LT1999HS8-50#PBF application, or LT1999HS8-50#PBF equivalent, key selection criteria include guaranteed H-grade temperature performance (–40°C to 125°C), SO-8 narrow package compatibility, 50V/V gain option for low-voltage shunt sensing, and FMEA-aware pinout availability in alternate variants.
Technical Context
The LT1999HS8-50#PBF 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 differential input impedance of 9.6kΩ (typ), CM input impedance ≥3.6kΩ (at VCM = –5V), and 75–105dB CMRR depending on frequency and common mode condition. Shutdown mode draws <10µA, with 1µs turn-on/turn-off timing and 2.5µs 0.5% settling for ±2V output steps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V fixed - enables accurate low-differential-voltage sensing (±80mV full-scale) with minimal shunt power loss. |
| Common Mode Range | –5V to 80V - supports direct high-side sensing in 48V industrial systems and low-side sensing down to negative rails. |
| Bandwidth | 1.2MHz - sufficient for PWM-based current loop control in switching power supplies and motor drives up to ~200kHz switching. |
| Gain Accuracy | ±0.5% max - ensures ≤0.5% error in current measurement without system-level calibration. |
| Input Offset Voltage | ±1.5mV max - contributes ≤±30µA error when used with 50mΩ shunt at 50V/V gain. |
| Supply Voltage | 4.5V to 5.5V - compatible with standard 5V logic rails and LDO-regulated domains. |
| Operating Temp | –40°C to 125°C - qualified for under-hood automotive and industrial ambient environments without derating. |
Pinout & Package
LT1999HS8-50#PBF is housed in an 8-lead plastic SO (narrow) package (S8), RoHS-compliant, with 1.27mm lead pitch and JEDEC MS-012AC outline. Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 4) | Power supply input | Internally tied pins accepting 4.5V–5.5V; dual connection improves supply current distribution and reduces PSRR sensitivity. |
| +IN (Pin 2) | Positive sense input | Differential input connected to high-side of shunt; matched with –IN for CMRR optimization. |
| –IN (Pin 3) | Negative sense input | Differential input connected to low-side of shunt; ESD-protected to –5.25V/88V. |
| GND (Pin 5) | Analog ground reference | Return path for REF divider and internal biasing; must be low-impedance to preserve CMRR. |
| REF (Pin 6) | Output common-mode reference | Sets output midpoint; open-circuit default = 2.5V; externally driven to shift output swing range. |
| OUT (Pin 7) | Amplified output | Low-impedance (0.15Ω) rail-to-rail capable output; drives ≥200pF directly or ≥100Ω + capacitive loads. |
| SHDN (Pin 8) | Shutdown control | Active-low logic input; <0.5V = shutdown (<10µA); floating = active (1.55mA typical). |
Key Features
| Feature | Design Value |
|---|---|
| High-side or low-side sensing | Valid across full –5V to 80V common mode range - eliminates need for level-shifting circuitry in 48V/60V bus monitoring. |
| AC CMRR >80dB at 100kHz | Maintains accuracy in noisy PWM environments - critical for stable current-loop feedback in motor drives. |
| 4kV HBM ESD rating | Robust handling during board assembly and field service - exceeds IEC 61000-4-2 Level 4 requirements. |
| FMEA-optimized pinout option | Available in MSOP-FMEA variant (e.g., LT1999HMS8-50F#PBF) - separates sensitive inputs from power/ground to reduce single-point failure risk. |
| AEC-Q100 qualified | H-grade version meets automotive reliability standards - suitable for EPS, battery management, and ADAS subsystems. |
Applications
| Motor Control Feedback | Battery Management System |
|---|---|
Use Scenario: Real-time phase current measurement in 3-phase BLDC motor drives using high-side shunts in 48V traction inverters. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier providing isolated, rail-compatible analog feedback to MCU ADC with <2.5µs settling. Use Value: Enables precise torque control and overcurrent protection without optical isolation or additional signal conditioning. | Use Scenario: Monitoring charge/discharge current in 12–48V Li-ion packs for EV auxiliary systems and energy storage. IC Role / Device Role / Timing Role: High-common-mode, bidirectional current sensor interfacing to precision SAR ADC with 50V/V gain scaling. Use Value: Delivers ±0.5% current accuracy across –40°C to 125°C, supporting SOC estimation and thermal runaway detection. |
| Industrial Power Supply | Fuse/MOSFET Health Monitor |
Use Scenario: Output current sensing in telecom rectifiers and server PSU modules operating at 54V nominal bus voltage. IC Role / Device Role / Timing Role: High-bandwidth (1.2MHz) current monitor feeding fast-response protection logic and digital power management ICs. Use Value: Detects short-circuit events within microseconds while maintaining accuracy under 80V transient surges. | Use Scenario: Continuous monitoring of MOSFET drain-source current in high-reliability PLC output stages and solid-state relays. IC Role / Device Role / Timing Role: Precision shunt amplifier detecting overcurrent, shoot-through, and open-load faults in real time. Use Value: Provides fail-safe current data to FPGA or safety MCU for SIL2-compliant diagnostics per IEC 61508. |
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 | 500kHz bandwidth, 20V/V gain only, 2.7V–5.5V supply, AEC-Q100 Grade 1 (–40°C to 125°C) | Limited to lower bandwidth and fixed 20V/V gain; no 50V/V option for ultra-low shunt voltages | Select when lower bandwidth suffices and supply voltage flexibility (2.7V) is required; not drop-in due to different gain and bandwidth. |
| MAX40056ATA+T | 2.5MHz bandwidth, 50V/V gain, –5V to 65V common mode, 2.7V–5.5V supply, –40°C to 125°C | Lower common mode max (65V vs. 80V); no AEC-Q100 qualification; different pinout (8-pin TDFN) | Choose for higher bandwidth where 65V CM range is sufficient; requires PCB redesign due to TDFN package and non-SO pinout. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999HS8-50#PBF uniquely delivers 50V/V gain with 80V common mode tolerance and SO-8 packaging in an automotive-grade H-temperature variant - making it optimal for space-constrained, high-voltage industrial and automotive current sensing where pin compatibility and extended voltage margin are critical.
Availability
LT1999HS8-50#PBF is available at Aetrix Electronics and suitable for H-bridge motor controls, battery management systems, and industrial power supplies requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LT1999HS8-50#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, 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 precision, high-voltage current sensing for demanding real-time control applications - engineered specifically for robustness in motor drives, power conversion, and battery systems where accuracy, speed, and reliability are non-negotiable.
FAQ
What is the maximum common mode voltage supported by the LT1999HS8-50#PBF?
The LT1999HS8-50#PBF supports an input common mode voltage range of –5V to 80V, verified per Absolute Maximum Ratings and Electrical Characteristics tables. This allows direct high-side sensing in 48V and 60V industrial buses, and operation below ground in certain solenoid or bidirectional power converter configurations. Operation beyond 80V risks permanent damage.
Does the LT1999HS8-50#PBF require external resistors for gain setting?
No, the LT1999HS8-50#PBF has a fixed internal gain of 50V/V and does not require external gain-setting resistors. The gain is achieved via laser-trimmed on-chip transresistance network (RG ≈ 200kΩ) and matched input resistors (RIN ≈ 4kΩ). External components are only needed for REF biasing or SHDN pull-down if required.
Can the LT1999HS8-50#PBF operate from a 3.3V supply?
No - the LT1999HS8-50#PBF is specified for 4.5V to 5.5V supply operation. While functional behavior may occur down to ~4V, Analog Devices does not characterize, guarantee, or recommend operation below 4.5V. For 3.3V systems, consider alternatives like the MAX40056 or INA240 series.
What is the purpose of the REF pin on the LT1999HS8-50#PBF?
On the LT1999HS8-50#PBF, the REF pin sets the output common-mode voltage. Internally biased to mid-supply (2.5V at 5V V+) via 160kΩ/160kΩ divider, it can be overdriven by an external source to shift the output swing range - enabling interface with ADCs requiring different input common-mode levels or single-supply operation.
Is the LT1999HS8-50#PBF pin-compatible with other LT1999 variants like LT1999HS8-10#PBF?
Yes - all LT1999HS8-x#PBF variants (x = 10/20/50) share identical SO-8 narrow package pinout, footprint, and terminal functions. Only the internal gain resistor network differs. This allows design reuse across gain options without layout changes, provided the REF and output swing constraints are verified for each gain setting.
LT1999HS8-50#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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1999HS8-50#PBF FAQ
1.How can I place an order for LT1999HS8-50#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999HS8-50#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 LT1999HS8-50#PBF reliable?
The price and inventory of LT1999HS8-50#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999HS8-50#PBF is usually 5 days.
3.What payment methods are accepted for LT1999HS8-50#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999HS8-50#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999HS8-50#PBF?
LT1999HS8-50#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999HS8-50#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 LT1999HS8-50#PBF?
For technical support, including LT1999HS8-50#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999HS8-50#PBF requirements.
6.How does Aetrix verify that LT1999HS8-50#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999HS8-50#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 LT1999HS8-50#PBF meets industry standards.
7.What is the process for return or replacement of LT1999HS8-50#PBF?
All LT1999HS8-50#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999HS8-50#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 LT1999HS8-50#PBF part is unused and in its original packaging.
Return procedure for LT1999HS8-50#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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