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Analog Devices Inc. LT1999HMS8-20F#PBF
- Part No.:
- LT1999HMS8-20F#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999HMS8-20F#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,298
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Product details
Overview
LT1999HMS8-20F#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 20V/V fixed gain, –5V to 80V input common mode range, 2MHz bandwidth, and FMEA-optimized 8-lead MSOP package. It senses current via external shunt resistor and outputs a voltage referenced to mid-supply or external REF, enabling precise monitoring in H-bridge motor controls and battery charge/discharge circuits.
For engineers reviewing the LT1999HMS8-20F#PBF datasheet, LT1999HMS8-20F#PBF pinout, LT1999HMS8-20F#PBF application, or LT1999HMS8-20F#PBF equivalent, key selection criteria include guaranteed operation from –40°C to 125°C, AEC-Q100 qualification for automotive use, 0.5% max gain error, and FMEA-engineered pinout for fault-tolerant system design.
Technical Context
The LT1999HMS8-20F#PBF uses matched internal resistive networks (R+IN/R–IN = 4kΩ each) and transconductance-to-transresistance architecture to convert differential shunt voltage into an amplified, level-shifted output. Its dual-path input biasing-via internal diode D1 below V+ and direct connection above V+-ensures smooth, continuous operation across the full –5V to 80V common mode range without gain or offset discontinuity.
It features a dedicated REF pin (Pin 6) that sets output common-mode level, supports external reference override within 1.125V to (V+ – 1.125V), and provides 70dB rejection of REF voltage variations. The SHDN pin (Pin 8) enables <10µA shutdown current and 1µs turn-on/turn-off timing, while the output drives ≥200pF loads directly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V fixed, enabling ±0.2V full-scale differential input for ±4V output swing at mid-supply reference |
| Common Mode Range | –5V to 80V, supporting high-side sensing in 48V industrial systems and low-side sensing down to negative rail |
| Bandwidth | 2MHz small-signal –3dB bandwidth, sufficient for real-time current feedback in PWM-controlled switching power supplies |
| Gain Accuracy | ±0.5% max over temperature, ensuring reliable current measurement without calibration in production systems |
| Input Offset Voltage | ±1.5mV max, limiting worst-case current measurement error to ≤75µA for 10mΩ shunt |
| Supply Current | 1.55mA typical active current, scalable to <10µA in shutdown for battery-powered applications |
| Operating Temperature | –40°C to 125°C, qualified per AEC-Q100 Grade H for under-hood automotive and industrial environments |
Pinout & Package
Package: 8-lead plastic MSOP (MS8) with FMEA-optimized pinout - engineered to prevent single-point failure modes in safety-critical systems. Pin 3 is NC (no connect); pins 1 and 4 are internally tied V+ supply inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Positive sense input | Connects to high-potential side of shunt; matched 4kΩ input impedance ensures accurate differential sensing |
| –IN (Pin 2) | Negative sense input | Connects to low-potential side of shunt; symmetric layout with +IN minimizes CMRR degradation |
| NC (Pin 3) | No connect | FMEA-designated open pin prevents unintended shorting during board-level fault conditions |
| V+ (Pin 4) | Power supply | Second V+ connection; paralleling with Pin 1 reduces supply path inductance and improves PSRR |
| GND (Pin 5) | Ground reference | Return path for internal bias currents and REF divider; isolated from power ground in split-ground layouts |
| REF (Pin 6) | Output reference level | Sets output common-mode voltage; externally driven to shift output range or reject noise on mid-supply rail |
| OUT (Pin 7) | Amplified output | Low-impedance voltage source (0.15Ω) capable of sourcing 31mA/sinking 26mA into 50Ω loads |
| SHDN (Pin 8) | Shutdown control | Active-low logic input; internal 2µA pull-up ensures default active state when left floating |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-optimized pinout | NC pin (Pin 3) eliminates risk of accidental short between adjacent signal and supply pins during solder bridging or contamination |
| Wide common mode range | –5V to 80V operation enables bidirectional current sensing in both high-side and low-side configurations without level-shifting circuitry |
| High AC CMRR | >80dB at 100kHz ensures accurate current measurement in noisy PWM environments with fast voltage transients |
| Robust ESD protection | 4kV HBM / 1kV CDM tolerance allows handling in standard manufacturing without special ESD controls |
| AEC-Q100 qualification | H-grade temperature rating (–40°C to 125°C) and stress testing meet automotive functional safety requirements for motor control and battery management |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Real-time phase current monitoring in 48V automotive HVAC blower motors with regenerative braking. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier measuring armature current magnitude and direction during forward/reverse drive and energy recovery. Use Value: Enables precise torque control and overcurrent protection using ±0.2V full-scale input range and 2MHz bandwidth to capture PWM-edge transients. | Use Scenario: Closed-loop current regulation in industrial pneumatic valve solenoids operating from 24V DC bus. IC Role / Device Role / Timing Role: High-side current monitor feeding analog input of microcontroller ADC for duty-cycle adjustment. Use Value: –5V to 80V common mode range accommodates solenoid flyback spikes up to 75V without clamping or saturation. |
| High Voltage Data Acquisition | PWM Control Loops |
Use Scenario: Isolated current measurement in telecom rectifier modules with 54V nominal output and transient surges to 80V. IC Role / Device Role / Timing Role: Precision shunt-based current sensor interfacing to isolated sigma-delta ADC via REF-referenced output. Use Value: 70dB REF pin rejection prevents common-mode noise coupling into measurement path when REF is driven from clean mid-supply rail. | Use Scenario: Fast current feedback in synchronous buck converter controlling server CPU VRM with 500kHz switching frequency. IC Role / Device Role / Timing Role: Low-latency current sense element providing 2.5µs settling time for cycle-by-cycle current limiting. Use Value: 2MHz bandwidth and 1.5mV offset ensure sub-1% current error at 30A with 1mΩ shunt, critical for phase balancing in multi-phase designs. |
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, –4V to 80V CM range, 4.5V to 5.5V supply, 1.1MHz bandwidth, SOIC-8 package | Lacks FMEA pinout; no NC pin; requires external REF decoupling for optimal CMRR | Select when SOIC-8 footprint compatibility is required and FMEA is not mandated by system safety analysis. |
| MAX4080TASA+ | 20V/V gain, –0.1V to 76V CM range, 4.5V to 76V supply, 250kHz bandwidth, 8-pin SO | Lower bandwidth limits use in >200kHz PWM systems; wider supply range enables direct high-voltage rail sensing | Select when sensing from >5.5V rails is needed and bandwidth requirements are ≤250kHz. |
Compared with INA240A1QDRQ1 and MAX4080TASA+, the LT1999HMS8-20F#PBF delivers superior high-frequency fidelity (2MHz vs ≤250kHz), built-in FMEA pinout for ASIL-B compliance, and tighter gain accuracy (±0.5% vs ±1%)-making it optimal for automotive motor control and high-speed power conversion where transient fidelity and functional safety are critical.
Availability
LT1999HMS8-20F#PBF is available at Aetrix Electronics and suitable for H-bridge motor controls, solenoid drivers, and high-voltage data acquisition systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT1999HMS8-20F#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 precision, high-voltage current sensing for safety-critical applications-including automotive battery management and industrial motor drives-where wide common mode range, AEC-Q100 qualification, and fault-tolerant packaging are mandatory.
FAQ
What is the operating temperature range for the LT1999HMS8-20F#PBF?
The LT1999HMS8-20F#PBF is rated for operation from –40°C to 125°C and is qualified per AEC-Q100 Grade H. This specification is validated across the full range, making it suitable for under-hood automotive applications and industrial environments with elevated ambient temperatures. The device maintains its 20V/V gain accuracy and 0.5% max gain error throughout this range.
How does the FMEA-optimized pinout of the LT1999HMS8-20F#PBF improve system reliability?
The LT1999HMS8-20F#PBF uses an FMEA-optimized MSOP pinout where Pin 3 is designated NC (no connect). This eliminates potential short-circuit faults between adjacent pins-such as +IN (Pin 1) and –IN (Pin 2)-during solder bridging, conductive debris, or PCB contamination. Unlike standard MSOP variants, this layout reduces single-point failure risk in ISO 26262-compliant designs without requiring additional external protection components.
Can the LT1999HMS8-20F#PBF be used for high-side current sensing in a 48V battery system?
Yes, the LT1999HMS8-20F#PBF supports high-side current sensing in 48V systems due to its –5V to 80V input common mode range and ability to operate with VCM up to 80V while powered from a 5V supply. Its internal biasing architecture ensures stable gain and offset performance even when VCM exceeds V+, and its 4kV HBM ESD rating enhances robustness against voltage transients common in battery disconnect events.
What is the role of the REF pin on the LT1999HMS8-20F#PBF, and how should it be configured?
The REF pin (Pin 6) on the LT1999HMS8-20F#PBF sets the output common-mode voltage level. By default, it floats at mid-supply (2.5V with 5V V+) via internal 160kΩ resistors. It can be driven externally within 1.125V to (V+ – 1.125V) to shift the output range-for example, to match ADC input range or reject noise on the mid-supply rail. REF rejection is 70dB, minimizing impact of reference rail noise on measurement accuracy.
Does the LT1999HMS8-20F#PBF require external compensation for driving capacitive loads?
The LT1999HMS8-20F#PBF can drive up to 200pF capacitive loads directly without external compensation. For loads exceeding 200pF-such as long PCB traces or ADC input capacitance-the datasheet recommends adding a series resistor ≥100Ω between OUT (Pin 7) and the load to maintain stability and prevent peaking or oscillation. This design consideration is verified in the device's small-signal frequency response and pulse response characterization.
LT1999HMS8-20F#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 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
LT1999HMS8-20F#PBF FAQ
1.How can I place an order for LT1999HMS8-20F#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999HMS8-20F#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 LT1999HMS8-20F#PBF reliable?
The price and inventory of LT1999HMS8-20F#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999HMS8-20F#PBF is usually 5 days.
3.What payment methods are accepted for LT1999HMS8-20F#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999HMS8-20F#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999HMS8-20F#PBF?
LT1999HMS8-20F#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999HMS8-20F#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 LT1999HMS8-20F#PBF?
For technical support, including LT1999HMS8-20F#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999HMS8-20F#PBF requirements.
6.How does Aetrix verify that LT1999HMS8-20F#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999HMS8-20F#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 LT1999HMS8-20F#PBF meets industry standards.
7.What is the process for return or replacement of LT1999HMS8-20F#PBF?
All LT1999HMS8-20F#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999HMS8-20F#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 LT1999HMS8-20F#PBF part is unused and in its original packaging.
Return procedure for LT1999HMS8-20F#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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