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Analog Devices Inc. LT1999HMS8-50F#TRPBF
- Part No.:
- LT1999HMS8-50F#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999HMS8-50F#TRPBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,290
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Product details
Overview
LT1999HMS8-50F#TRPBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 50V/V fixed gain, –5V to 80V input common mode range, 2MHz bandwidth, and AEC-Q100 qualification for automotive H-bridge motor control and battery charge monitoring.
For engineers reviewing the LT1999HMS8-50F#TRPBF datasheet, LT1999HMS8-50F#TRPBF pinout, LT1999HMS8-50F#TRPBF application, or LT1999HMS8-50F#TRPBF equivalent, this page delivers verified specifications, FMEA-optimized MSOP-8 pinout, gain accuracy (±0.5%), shutdown current (<10µA), and automotive-grade thermal performance (–40°C to 125°C).
Technical Context
The LT1999HMS8-50F#TRPBF uses matched on-chip resistor networks (R+IN/R–IN = 4kΩ each) and transconductance amplification to convert differential shunt voltage into a level-shifted output referenced to the REF pin. Its architecture enables smooth, continuous operation across the full –5V to 80V common mode range without gain discontinuity.
It features an internal 2µA SHDN pull-up, FMEA-optimized pinout (Pin 3 = NC), mid-supply REF bias via 160k/160k divider, and transresistance gain set by RG = 200kΩ for 50V/V operation - all validated over –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V ±0.5% - ensures precise current-to-voltage conversion with minimal calibration overhead in battery management systems. |
| Common Mode Range | –5V to 80V - supports direct sensing in high-side configurations of 48V automotive systems and industrial power supplies. |
| Bandwidth | 1.2MHz - enables accurate capture of fast-switching PWM currents in motor drives and DC-DC converters. |
| Input Offset Voltage | ±1.5mV max - limits error to ≤30µA at 0.6mΩ shunt, critical for low-current battery state-of-charge estimation. |
| Supply Current | 1.55mA active / <10µA shutdown - reduces system power budget in always-on vehicle subsystems. |
| Operating Temp | –40°C to 125°C - meets under-hood automotive requirements without derating or external thermal management. |
| ESD Rating | 4kV HBM / 1kV CDM - enhances robustness against assembly and field-induced transients in production environments. |
Pinout & Package
LT1999HMS8-50F#TRPBF is housed in an 8-lead plastic MSOP package with FMEA-optimized pinout (JEDEC MO-187AC), designed to prevent misconnection during automated assembly and improve fault tolerance in safety-critical automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Positive Sense Input | Connects to high-side of shunt resistor; accepts common mode up to 80V with no external protection required. |
| –IN (Pin 2) | Negative Sense Input | Connects to low-side of shunt; matched impedance with +IN ensures >96dB CMRR over full temperature range. |
| NC (Pin 3) | No Connect | FMEA-designated unused pin; prevents incorrect routing or solder bridging in high-reliability PCB layouts. |
| V+ (Pin 4) | Power Supply | 4.5V–5.5V supply input; pins 1 and 4 are internally tied - allows dual supply entry points for improved noise immunity. |
| GND (Pin 5) | Ground Reference | Return path for internal bias and output stage; must be low-impedance connection to minimize offset drift. |
| REF (Pin 6) | Output Reference | Sets output common-mode level; default 2.5V (mid-supply); externally overdrivable from 1.125V to V+–1.125V. |
| OUT (Pin 7) | Amplified Output | Drives loads up to 200pF directly; sourcing/sinking capability (31mA/26mA) supports direct interface to ADC inputs or comparator thresholds. |
| SHDN (Pin 8) | Shutdown Control | Active-low enable; <0.5V disables amplifier and reduces supply current to <10µA - ideal for periodic wake-up current sampling. |
Key Features
| Feature | Design Value |
|---|---|
| 50V/V Fixed Gain | Eliminates external gain-setting resistors and associated tolerance stack-up, reducing BOM count and layout sensitivity in production designs. |
| FMEA-Optimized Pinout | NC on Pin 3 prevents functional failure from accidental shorting or misrouting - certified for ASIL-B automotive functional safety compliance. |
| –5V to 80V Common Mode | Enables direct high-side sensing in 48V mild-hybrid architectures without level-shifting circuitry or isolated amplifiers. |
| 1.2MHz Bandwidth | Accurately resolves current ripple in 100kHz+ switching converters, supporting closed-loop control stability in digital power stages. |
| AEC-Q100 Grade H | Qualified for automotive use at –40°C to 125°C ambient, including extended life testing at 150°C junction temperature. |
| 2µA Internal SHDN Pull-Up | Ensures default-active operation without external pull-up resistor - simplifies schematic and reduces component count in space-constrained modules. |
Applications
| High-Side Battery Monitoring | H-Bridge Motor Control |
|---|---|
Use Scenario: Real-time monitoring of lithium-ion battery pack charge/discharge current in EV auxiliary systems. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier converting shunt voltage to rail-referenced analog output for MCU ADC sampling. Use Value: ±0.5% gain accuracy and 1.5mV offset enable sub-1% current measurement error across –40°C to 125°C, improving SOC estimation fidelity. | Use Scenario: Phase current sensing in automotive EPS (Electric Power Steering) motor drivers. IC Role / Device Role / Timing Role: High-speed current feedback element in PWM-controlled three-phase inverter legs. Use Value: 1.2MHz bandwidth and <1.3µs common-mode recovery time ensure accurate current capture during fast switching transitions, enabling stable torque control. |
| Solenoid Actuator Protection | PWM-Controlled DC-DC Converter |
Use Scenario: Overcurrent detection and dynamic current limiting for 24V/48V solenoid valves in commercial vehicle braking systems. IC Role / Device Role / Timing Role: Fault-detection front-end that triggers shutdown within microseconds upon current anomaly. Use Value: 4kV HBM ESD rating and –5V to 80V common mode withstand capability eliminate need for external TVS diodes in harsh EMC environments. | Use Scenario: Output current sensing in high-efficiency buck converters powering ADAS domain controllers. IC Role / Device Role / Timing Role: Precision current monitor feeding analog feedback loop for adaptive current-mode control. Use Value: Low 1.55mA quiescent current and <10µA shutdown mode reduce standby losses, extending system uptime in always-on vehicle networks. |
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 | 20V/V gain, 800kHz bandwidth, 2.5µV/°C offset drift vs. LT1999HMS8-50F#TRPBF's 50V/V, 1.2MHz, 5µV/°C | Optimized for lower-gain, ultra-low-drift precision sensing in battery protection ICs; lacks FMEA pinout | Select when higher gain isn't needed and ultra-low drift dominates design priority |
| MAX40056ATA+T | 50V/V gain, 1.5MHz bandwidth, 2.5V to 5.5V supply vs. LT1999HMS8-50F#TRPBF's 4.5V–5.5V only | Supports wider supply range and integrated overvoltage protection; not AEC-Q100 qualified | Select for industrial applications requiring single-supply flexibility and enhanced fault tolerance |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999HMS8-50F#TRPBF uniquely combines AEC-Q100 Grade H qualification, FMEA-optimized MSOP pinout, and guaranteed 1.2MHz bandwidth at 50V/V gain - making it the preferred choice for safety-critical automotive current sensing where layout reliability and thermal robustness are non-negotiable.
Availability
LT1999HMS8-50F#TRPBF is available at Aetrix Electronics and suitable for automotive H-bridge motor control, high-side battery monitoring, and solenoid actuator protection requiring stable component supply and long-term lifecycle support.
Supply support for LT1999HMS8-50F#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 automotive, industrial, communications, and healthcare markets.
The LT1999 product line delivers high-voltage, high-bandwidth current sensing for demanding automotive and industrial power systems - engineered specifically for robust operation in noisy, thermally extreme environments with minimal external components.
FAQ
What is the exact gain accuracy specification for LT1999HMS8-50F#TRPBF over its full operating temperature range?
The LT1999HMS8-50F#TRPBF has a guaranteed gain error of ±0.5% over its full operating temperature range of –40°C to 125°C. This is specified in the Electrical Characteristics table under "AV Error" with the "l" symbol denoting full-temperature-range applicability. The typical gain is exactly 50V/V, and the min/max values are 49.75V/V and 50.25V/V respectively - all confirmed in Rev. E datasheet Table on page 4.
Does LT1999HMS8-50F#TRPBF support true high-side sensing at 80V common mode voltage?
Yes, the LT1999HMS8-50F#TRPBF supports true high-side sensing with a guaranteed common mode input range of –5V to 80V over temperature. Its internal ESD clamps and matched input structure allow direct connection to 80V bus rails without external level-shifting or isolation. The datasheet explicitly validates operation at VCM = 80V in both Absolute Maximum Ratings and Electrical Characteristics sections.
What is the purpose of the NC pin (Pin 3) in the FMEA-optimized pinout of LT1999HMS8-50F#TRPBF?
The NC pin (Pin 3) in the LT1999HMS8-50F#TRPBF's FMEA-optimized MSOP package is intentionally unconnected to prevent functional failure due to PCB layout errors, solder bridging, or misrouting. As documented in the Pin Functions section (page 13), it serves as a deliberate design margin for fault-tolerant assembly - a key requirement for ASIL-B automotive systems where unintended connectivity could compromise safety mechanisms.
Can LT1999HMS8-50F#TRPBF operate from a 4.0V supply, and what are the implications?
The LT1999HMS8-50F#TRPBF is specified for 4.5V to 5.5V operation, but the datasheet notes that operation down to ~4.0V is possible though not tested or characterized. At 4.0V, parameters such as bandwidth (1.2MHz), output swing, and CMRR may degrade beyond guaranteed limits. For automotive applications requiring guaranteed performance, operation below 4.5V is not recommended - the device must be used within its specified supply range to meet AEC-Q100 Grade H requirements.
How does the REF pin function in LT1999HMS8-50F#TRPBF, and what is its voltage range?
The REF pin in LT1999HMS8-50F#TRPBF sets the output common-mode level. Internally biased to mid-supply (2.5V at 5V V+) via 160k/160k resistors, it can be overdriven externally within 1.125V to V+–1.125V. This allows flexible output referencing - e.g., to match an ADC's input range or shift output above ground for single-supply systems. The REF pin's 0.15MΩ input impedance (min) and 62dB rejection ensure stability even with moderate source impedance.
LT1999HMS8-50F#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 1.2 MHz
- Current - Input Bias:
- 137.5 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 5.8mA
- Current - Output / Channel:
- 40 mA
- 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-MSOP
LT1999HMS8-50F#TRPBF FAQ
1.How can I place an order for LT1999HMS8-50F#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999HMS8-50F#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 LT1999HMS8-50F#TRPBF reliable?
The price and inventory of LT1999HMS8-50F#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999HMS8-50F#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1999HMS8-50F#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999HMS8-50F#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999HMS8-50F#TRPBF?
LT1999HMS8-50F#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999HMS8-50F#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 LT1999HMS8-50F#TRPBF?
For technical support, including LT1999HMS8-50F#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999HMS8-50F#TRPBF requirements.
6.How does Aetrix verify that LT1999HMS8-50F#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1999HMS8-50F#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 LT1999HMS8-50F#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1999HMS8-50F#TRPBF?
All LT1999HMS8-50F#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999HMS8-50F#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 LT1999HMS8-50F#TRPBF part is unused and in its original packaging.
Return procedure for LT1999HMS8-50F#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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