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Analog Devices Inc. LT1999HMS8-20F#WPBF
- Part No.:
- LT1999HMS8-20F#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999HMS8-20F#WPBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,659
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Product details
Overview
LT1999HMS8-20F#WPBF 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 AEC-Q100 qualification for automotive H-bridge motor control and battery charge monitoring.
For engineers reviewing the LT1999HMS8-20F#WPBF datasheet, LT1999HMS8-20F#WPBF pinout, LT1999HMS8-20F#WPBF application, or LT1999HMS8-20F#WPBF equivalent, this page delivers verified specifications, FMEA-optimized MSOP-8 pinout, automotive-grade thermal performance (–40°C to 125°C), and real-world current sensing use cases in high-side/low-side configurations.
Technical Context
The LT1999HMS8-20F#WPBF uses matched on-chip resistive sensing (R+IN/R–IN = 4kΩ each) and transconductance amplification to convert differential shunt voltage into a referenced output. Its internal 160kΩ/160kΩ divider sets mid-supply REF bias, while external REF override enables custom common-mode level shifting.
Operation remains stable across –5V to 80V common mode transitions: below V+, diode D1 activates to bias GIN inputs ≥2.25V above GND; above V+, D1 is off and input impedance exceeds 5MΩ. Gain accuracy (±0.5%) and CMRR (>96dB over full range) are maintained without discontinuity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V ±0.5% - ensures precise scaling of ±0.2V full-scale shunt voltage to ±4V output swing. |
| Common Mode Range | –5V to 80V - supports direct sensing in 48V automotive systems, high-side switch nodes, and industrial DC bus monitoring. |
| Bandwidth | 2MHz - enables accurate current capture in fast-switching PWM motor drives and SMPS feedback loops. |
| Input Offset Voltage | ±1.5mV max - limits error to ≤30µV at 20× gain, critical for low-current (<1A) precision measurement. |
| Supply Current | 1.55mA active / <10µA shutdown - reduces power in always-on vehicle subsystems without sacrificing responsiveness. |
| Operating Temp | –40°C to 125°C - meets under-hood automotive requirements per AEC-Q100 Grade H specification. |
| ESD Rating | 4kV HBM / 1kV CDM - withstands assembly handling and in-system transients in harsh environments. |
Pinout & Package
LT1999HMS8-20F#WPBF is housed in an 8-lead plastic MSOP package with FMEA-optimized pinout (pin 3 = NC), designed to prevent misconnection-induced failure 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 matched 4kΩ input impedance. |
| –IN (Pin 2) | Negative sense input | Connects to low-side of shunt; differential pair with +IN defines VSENSE = V+IN – V–IN. |
| NC (Pin 3) | No connect | FMEA safeguard: physically present but unconnected to prevent incorrect routing to sensitive analog nodes. |
| V+ (Pin 4) | Power supply | 4.5V–5.5V supply rail; pins 1 and 4 internally tied-dual connection improves PSRR and thermal derating. |
| GND (Pin 5) | Ground reference | Analog ground return for REF divider and output stage; separate from power ground in layout-critical designs. |
| REF (Pin 6) | Output common-mode reference | Default = V+/2; externally driven to shift output baseline (e.g., 0–5V for ADC interface). |
| OUT (Pin 7) | Amplified output | Low-impedance (0.15Ω) voltage source; drives 200pF directly; requires series R ≥100Ω for larger capacitive loads. |
| SHDN (Pin 8) | Shutdown control | Active-low: ≤0.5V disables amplifier, reducing IQ to <10µA; floating or >V+–0.5V enables operation via 2µA internal pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Outputs positive/negative voltage relative to REF to indicate current direction-enables regenerative braking detection in motor controllers. |
| FMEA-optimized pinout | Pin 3 designated NC eliminates risk of accidental connection to +IN/–IN during PCB rework or connector mating errors. |
| Smooth common-mode transition | No gain or offset discontinuity when VCM crosses V+; eliminates output glitches during startup or fault recovery in 48V systems. |
| AEC-Q100 qualified | Validated for automotive Grade H (–40°C to 125°C ambient); includes HTOL, temperature cycling, and ESD stress testing per automotive standards. |
| High CMRR at 100kHz | >80dB AC CMRR at 100kHz suppresses switching noise from adjacent MOSFETs or gate drivers in compact power stages. |
Applications
| Electric Power Steering (EPS) | 48V Mild Hybrid Battery Management |
|---|---|
Use Scenario: Real-time phase current monitoring in three-phase EPS motor inverters with 60V bus transients. IC Role / Device Role / Timing Role: High-side current sense amplifier feeding motor control MCU ADC with 2MHz bandwidth for field-oriented control loop closure. Use Value: ±0.5% gain accuracy and 2.5µs settling time enable <1% torque ripple; FMEA pinout prevents catastrophic short during service replacement. | Use Scenario: Bidirectional charge/discharge current sensing in 48V lithium-ion battery packs during regenerative braking and engine start-stop cycles. IC Role / Device Role / Timing Role: Precision shunt-based current monitor interfaced to battery monitor IC via REF-adjusted 0–5V output range. Use Value: –5V to 80V common mode range covers full pack voltage swing; 1.5mV offset ensures <50mA error at 25A full scale. |
| Industrial Servo Drive Current Feedback | Automotive HVAC Blower Motor Control |
Use Scenario: Closed-loop current regulation in 100VDC industrial servo amplifiers with fast PWM switching (20kHz+). IC Role / Device Role / Timing Role: Low-latency current feedback element in analog current loop, driving isolated amplifier input with minimal phase shift. Use Value: 2MHz bandwidth preserves signal integrity up to 5th harmonic of 20kHz PWM; 4kV HBM rating survives IGBT switching transients. | Use Scenario: Low-power, always-on current monitoring for diagnostic logging of HVAC blower motor stall/failure events in parked vehicles. IC Role / Device Role / Timing Role: Always-active current sensor with shutdown mode triggered only during deep sleep to extend battery life. Use Value: <10µA shutdown current extends 12V auxiliary battery life beyond 30 days; AEC-Q100 qualification ensures reliability over 15-year vehicle lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V gain, –4V to 80V CM range, 4.5MHz bandwidth, 120dB CMRR @ DC, SO-8 package | Higher bandwidth and CMRR; lacks FMEA pinout and NC pin; not optimized for mechanical misconnection prevention | Select for higher-speed control loops where glitch immunity outweighs FMEA requirements |
| MAX40056ATA+T | 20V/V gain, –5V to 65V CM range, 1.5MHz bandwidth, 90dB CMRR @ 100kHz, 8-pin TDFN | Narrower common mode range; smaller footprint; no AEC-Q100 qualification; different REF architecture (fixed internal bias) | Select for space-constrained non-automotive applications where 65V max bus voltage is sufficient |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999HMS8-20F#WPBF uniquely combines AEC-Q100 Grade H qualification, FMEA-optimized MSOP pinout with NC pin, and seamless –5V to 80V common mode operation-making it the only choice for safety-critical automotive current sensing where mechanical robustness and wide-range stability are mandatory.
Availability
LT1999HMS8-20F#WPBF is available at Aetrix Electronics and suitable for electric power steering, 48V mild hybrid BMS, and industrial servo drive applications requiring stable component supply, long-term automotive qualification, and FMEA-compliant design assurance.
Supply support for LT1999HMS8-20F#WPBF 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 automotive and industrial applications, with emphasis on AEC-Q100 compliance, wide common-mode operation, and fault-tolerant packaging.
FAQ
What is the maximum common mode voltage the LT1999HMS8-20F#WPBF can handle?
The LT1999HMS8-20F#WPBF supports a continuous input common mode voltage range of –5V to 80V. This allows direct connection to high-side shunts in 48V automotive systems and industrial DC buses without external level-shifting circuitry. The device maintains specified gain accuracy and CMRR across the entire range, including transitions through the supply rail (V+).
Does the LT1999HMS8-20F#WPBF require external resistors for gain setting?
No, the LT1999HMS8-20F#WPBF has a fixed 20V/V gain implemented with laser-trimmed on-chip resistors. Unlike programmable current sense amplifiers, it requires no external gain-setting components-reducing BOM count, layout area, and calibration drift. The gain error is guaranteed at ±0.5% over temperature and common mode range.
How does the FMEA-optimized pinout of the LT1999HMS8-20F#WPBF improve system reliability?
The LT1999HMS8-20F#WPBF uses an FMEA-optimized MSOP-8 pinout where Pin 3 is designated NC (no connect). This prevents accidental solder bridging or misrouting between +IN and –IN during manufacturing or field repair-eliminating potential short-circuit faults that could damage the shunt or downstream MCU. It is a hardware-level safety feature required for ASIL-B/C automotive designs.
Can the LT1999HMS8-20F#WPBF operate from a 3.3V supply?
No, the LT1999HMS8-20F#WPBF is specified for 4.5V to 5.5V operation. While the datasheet notes functionality may persist down to ~4V, Analog Devices does not characterize, guarantee, or recommend operation below 4.5V. Using 3.3V violates absolute maximum ratings and risks degraded CMRR, bandwidth, and output swing-especially at temperature extremes.
What is the purpose of the REF pin on the LT1999HMS8-20F#WPBF?
The REF pin on the LT1999HMS8-20F#WPBF sets the output common-mode voltage level. Internally biased to V+/2 by a 160kΩ/160kΩ divider, it can be overdriven by an external voltage source (within 1.125V to V+–1.125V) to shift the output baseline-e.g., to 0–5V for direct ADC interfacing or to match other system references. This decouples output level from supply variations.
LT1999HMS8-20F#WPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- 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:
- 31 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#WPBF FAQ
1.How can I place an order for LT1999HMS8-20F#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999HMS8-20F#WPBF 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#WPBF reliable?
The price and inventory of LT1999HMS8-20F#WPBF 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#WPBF is usually 5 days.
3.What payment methods are accepted for LT1999HMS8-20F#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999HMS8-20F#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999HMS8-20F#WPBF?
LT1999HMS8-20F#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999HMS8-20F#WPBF 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#WPBF?
For technical support, including LT1999HMS8-20F#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999HMS8-20F#WPBF requirements.
6.How does Aetrix verify that LT1999HMS8-20F#WPBF is sourced from the original manufacturer or authorized distributors?
All LT1999HMS8-20F#WPBF 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#WPBF meets industry standards.
7.What is the process for return or replacement of LT1999HMS8-20F#WPBF?
All LT1999HMS8-20F#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999HMS8-20F#WPBF, 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#WPBF part is unused and in its original packaging.
Return procedure for LT1999HMS8-20F#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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