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Analog Devices Inc. LT1999MPMS8-20#PBF
- Part No.:
- LT1999MPMS8-20#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999MPMS8-20#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:211
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Product details
Overview
LT1999MPMS8-20#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 ±0.5% gain accuracy. It operates from a 4.5V–5.5V supply, draws 1.55mA, and supports high-side or low-side sensing in H-bridge motor controls and battery charge monitoring.
For engineers reviewing the LT1999MPMS8-20#PBF datasheet, LT1999MPMS8-20#PBF pinout, LT1999MPMS8-20#PBF application, or LT1999MPMS8-20#PBF equivalent, this page delivers verified specifications, FMEA-optimized MSOP package details, MP-grade (–55°C to 150°C) thermal performance, and automotive-qualified alternatives for robust current sensing in harsh environments.
Technical Context
The LT1999MPMS8-20#PBF uses matched internal 4kΩ sense resistors and a transconductance-based architecture to convert differential shunt voltage into an output-referred current, then into a level-shifted voltage via transresistance amplifier AO and on-chip 80kΩ RG resistor. Its dual-path biasing (D1 conduction below V+; open-circuit above) ensures smooth operation across the full –5V to 80V common mode range without gain or offset discontinuity.
It features a dedicated REF pin (2.5V open-circuit default) that sets output common-mode level, enabling flexible level-shifting; SHDN pin provides <10µA shutdown current; and output drives up to 200pF directly. Input-referred offset is ±750µV max over temperature, with 8µV/°C drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V fixed - enables precise 20× amplification of shunt voltage for accurate current magnitude/direction detection. |
| Common Mode Range | –5V to 80V - supports direct sensing in high-voltage systems like 48V battery packs and industrial power supplies without external level-shifting. |
| Bandwidth | 2MHz - captures fast current transients in PWM-controlled motor drives and switching regulators. |
| Gain Accuracy | ±0.5% max - ensures ≤10mV error at ±100mV input, critical for closed-loop current regulation fidelity. |
| Supply Current | 1.55mA typical at VCM > 5.5V - enables low-power operation in always-on monitoring circuits. |
| Operating Temp | –55°C to 150°C - qualified for under-hood automotive, aerospace, and industrial embedded applications requiring extended thermal reliability. |
| Shutdown Current | <10µA - reduces system standby power in battery-powered equipment during sleep modes. |
Pinout & Package
LT1999MPMS8-20#PBF is housed in an 8-lead plastic MSOP package (MS8), with FMEA-optimized pinout (Pin 1 = +IN, Pin 2 = –IN, Pin 3 = NC, Pin 4 = V+, Pin 5 = GND, Pin 6 = REF, Pin 7 = OUT, Pin 8 = SHDN). Thermal resistance θJA = 300°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Positive sense input | Connects to high-side of shunt resistor; forms differential pair with –IN for bidirectional current polarity detection. |
| –IN (Pin 2) | Negative sense input | Connects to low-side of shunt resistor; matched impedance with +IN ensures CMRR > 96dB over full common mode range. |
| NC (Pin 3) | No connect | FMEA-optimized layout isolates unused terminal to prevent misrouting or accidental shorting in safety-critical designs. |
| V+ (Pin 4) | Power supply | 4.5V–5.5V single supply; pins 1 and 4 are internally tied - allows flexible PCB routing with dual supply entry points. |
| GND (Pin 5) | Ground reference | Return path for internal bias currents and output stage; must be low-impedance to maintain PSRR > 68dB. |
| REF (Pin 6) | Output common-mode reference | Sets output midpoint; default 2.5V (mid-supply); externally adjustable from 1.125V to V+–1.125V for custom level-shifting. |
| OUT (Pin 7) | Amplified output | Delivers VOUT = 20 × (V+IN – V–IN) + VREF; drives 1kΩ loads with 125mV headroom to rails. |
| SHDN (Pin 8) | Shutdown control | Logic-low (≤0.5V) disables amplifier; internal 2µA pull-up ensures active state when floating - simplifies enable logic. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Outputs positive/negative voltage relative to REF to indicate current direction - eliminates need for external polarity logic in charge/discharge monitoring. |
| Smooth common mode transition | No gain or offset discontinuity between –5V and 80V - enables reliable operation during voltage rail collapse or startup in automotive ECU power stages. |
| 4kV HBM / 1kV CDM ESD rating | Robust input protection withstands assembly handling and field surges - reduces need for external TVS in motor drive PCB layouts. |
| AEC-Q100 qualified (H-grade) | Validated for automotive use up to 125°C ambient - MP-grade variant extends qualification to 150°C junction, supporting under-hood placement. |
| FMEA-optimized MSOP pinout | NC on Pin 3 prevents incorrect connection in safety-critical systems - aligns with ISO 26262 hardware design requirements for fault mitigation. |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Monitoring phase current in 48V electric power steering (EPS) H-bridge drivers during torque assist and regenerative braking. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier providing real-time magnitude and polarity feedback to MCU for closed-loop current control. Use Value: 2MHz bandwidth captures PWM-edge transients; ±0.5% gain accuracy ensures torque command fidelity within ±2% across –40°C to 150°C. | Use Scenario: Detecting coil energization/de-energization in heavy-duty vehicle transmission solenoids operating at 24V nominal with 80V load dump peaks. IC Role / Device Role / Timing Role: High-common-mode-range current monitor interfacing directly to solenoid driver outputs without isolation. Use Value: –5V to 80V common mode range tolerates load dump transients; 1.55mA quiescent current minimizes parasitic drain in always-on diagnostic circuits. |
| High Voltage Data Acquisition | PWM Control Loops |
Use Scenario: Digitizing battery pack cell-string currents in 800V EV traction inverters using precision shunt-based measurement. IC Role / Device Role / Timing Role: Front-end analog current conditioner feeding ADC inputs with rail-to-rail compatible output swing. Use Value: REF pin flexibility allows output alignment to ADC reference; 2.5V default mid-supply output matches typical SAR ADC input ranges. | Use Scenario: Real-time current feedback in digitally controlled LLC resonant converters for server PSU applications. IC Role / Device Role / Timing Role: Fast-settling (2.5µs to 0.5%) current sensor synchronizing with 500kHz switching frequency for cycle-by-cycle current limiting. Use Value: 2MHz bandwidth and 3V/µs slew rate support accurate current sampling within narrow dead-time windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QPWRQ1 | 20V/V gain, –4V to 80V common mode, 4.5V–5.5V supply, but only –40°C to 125°C grade available (no MP). | Automotive-qualified AEC-Q100 Grade 1; lacks extended –55°C start-up capability and 150°C junction rating. | Select when AEC-Q100 Grade 1 compliance suffices and extended temperature is not required. |
| MAX40056ATA+T | 20V/V gain, –0.2V to 65V common mode, 3.3V/5V supply, 1.5MHz bandwidth, ±0.3% gain error. | Lower common mode range excludes 80V load dump scenarios; optimized for 3.3V systems with tighter gain tolerance. | Select for cost-sensitive 3.3V industrial applications where 65V max common mode is sufficient. |
Compared with INA240A1QPWRQ1 and MAX40056ATA+T, the LT1999MPMS8-20#PBF uniquely combines MP-grade temperature range (–55°C to 150°C), 80V common mode tolerance, and FMEA-optimized pinout - making it the only option qualified for mission-critical automotive and aerospace current sensing where extended thermal margin and fault-aware layout are mandatory.
Availability
LT1999MPMS8-20#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 extreme temperature and voltage conditions.
Supply support for LT1999MPMS8-20#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 safety-critical power systems - designed specifically for automotive electrification, industrial motor drives, and energy storage applications demanding wide common mode range and extended temperature operation.
FAQ
What is the maximum common mode voltage supported by the LT1999MPMS8-20#PBF?
The LT1999MPMS8-20#PBF supports a continuous input common mode voltage range of –5V to 80V. This specification is guaranteed over its full operating temperature range of –55°C to 150°C and enables direct sensing in 48V and 800V battery systems, including transient load dump events. The device uses internal ESD clamps rated for –5.25V to 88V, providing margin beyond the specified operating range.
Does the LT1999MPMS8-20#PBF require external components for basic operation?
No, the LT1999MPMS8-20#PBF operates with minimal external components: only 0.1µF bypass capacitors on V+ and REF pins are recommended. Its internal 160kΩ/160kΩ divider sets REF to mid-supply (2.5V) by default, and the SHDN pin has an internal 2µA pull-up - eliminating need for external biasing resistors or enable circuitry in most applications.
How does the REF pin function in the LT1999MPMS8-20#PBF?
The REF pin in the LT1999MPMS8-20#PBF sets the output common-mode voltage level. By default, it floats at 2.5V (mid-supply) due to internal resistive dividers. It can be overdriven by an external source within 1.125V to V+–1.125V to shift the output baseline - enabling interface with ADCs or controllers requiring non-mid-supply reference levels, while maintaining ±3.5mV offset impact over the MP temperature range.
What is the purpose of the NC pin in the LT1999MPMS8-20#PBF's FMEA-optimized MSOP package?
The NC (No Connect) pin on Pin 3 of the LT1999MPMS8-20#PBF's FMEA-optimized MSOP package is intentionally unconnected to reduce risk of incorrect routing or solder bridging in safety-critical layouts. This pinout variant was engineered per functional safety guidelines to prevent fault propagation - for example, avoiding unintended shorting between +IN and adjacent terminals during reflow or mechanical stress.
Can the LT1999MPMS8-20#PBF be used in AEC-Q100 automotive applications?
Yes, the LT1999MPMS8-20#PBF is AEC-Q100 qualified for automotive applications. While the standard H-grade version is certified to Grade 0 (–40°C to 125°C), the MP-grade variant extends qualification to –55°C to 150°C junction temperature and includes enhanced reliability testing per AEC-Q100 stress test conditions - making it suitable for under-hood and traction inverter current sensing in EV/HEV platforms.
LT1999MPMS8-20#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:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1999MPMS8-20#PBF FAQ
1.How can I place an order for LT1999MPMS8-20#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999MPMS8-20#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 LT1999MPMS8-20#PBF reliable?
The price and inventory of LT1999MPMS8-20#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999MPMS8-20#PBF is usually 5 days.
3.What payment methods are accepted for LT1999MPMS8-20#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999MPMS8-20#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999MPMS8-20#PBF?
LT1999MPMS8-20#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999MPMS8-20#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 LT1999MPMS8-20#PBF?
For technical support, including LT1999MPMS8-20#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999MPMS8-20#PBF requirements.
6.How does Aetrix verify that LT1999MPMS8-20#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999MPMS8-20#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 LT1999MPMS8-20#PBF meets industry standards.
7.What is the process for return or replacement of LT1999MPMS8-20#PBF?
All LT1999MPMS8-20#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999MPMS8-20#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 LT1999MPMS8-20#PBF part is unused and in its original packaging.
Return procedure for LT1999MPMS8-20#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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