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Analog Devices Inc. LT1999HMS8-50F#WPBF
- Part No.:
- LT1999HMS8-50F#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999HMS8-50F#WPBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT1999HMS8-50F#WPBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 50V/V fixed gain, –5V to 80V input common mode range, 2.5mV max input offset voltage, and 1.2MHz small-signal bandwidth. It enables precision full-bridge armature current monitoring in automotive H-bridge motor controllers operating across –40°C to 125°C.
For engineers reviewing the LT1999HMS8-50F#WPBF datasheet, LT1999HMS8-50F#WPBF pinout, LT1999HMS8-50F#WPBF application, or LT1999HMS8-50F#WPBF equivalent, key selection criteria include FMEA-optimized MSOP pinout, AEC-Q100 qualification, ±0.5% gain accuracy over temperature, and shutdown current <10µA for battery-sensitive systems.
Technical Context
The LT1999HMS8-50F#WPBF 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 ensures smooth, continuous operation across the full –5V to 80V common mode range without gain discontinuity.
It features dual-stage biasing: above V+, inputs are biased via internal current sources; below V+, diode D1 activates to maintain ≥2.25V headroom above GND for transconductor GIN. The REF pin supports external voltage setting (1.125V to V+–1.125V), enabling flexible output common-mode alignment in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V ±0.5% - Enables precise 20mV full-scale shunt sensing for 100A systems with 200µΩ resistors. |
| Common Mode Range | –5V to 80V - Supports direct high-side sensing in 48V/60V industrial and automotive battery systems. |
| Input Offset Voltage | ±2.5mV max - Limits current measurement error to ≤50µA at 50V/V gain with 100mΩ shunt. |
| Bandwidth | 1.2MHz - Captures fast PWM edge transitions in switching power supplies and motor control loops. |
| Supply Current | 1.55mA active / <10µA shutdown - Reduces quiescent load in always-on vehicle subsystems. |
| Operating Temp | –40°C to 125°C - Qualified for under-hood automotive applications per AEC-Q100 Grade H. |
| ESD Rating | 4kV HBM / 1kV CDM - Robust against assembly and system-level electrostatic discharge events. |
Pinout & Package
LT1999HMS8-50F#WPBF is housed in an 8-lead MSOP package with FMEA-optimized pinout (pin 3 = NC), designed to prevent misconnection-induced failure modes in safety-critical automotive systems.
| 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. |
| –IN (Pin 2) | Negative Sense Input | Connects to low-side of shunt; differential input defines current direction and magnitude. |
| NC (Pin 3) | No Connect | FMEA safeguard: prevents erroneous routing to functional pins during layout or assembly. |
| V+ (Pin 4) | Power Supply | 4.5V–5.5V supply; pins 1 and 4 internally tied-dual connection improves PSRR. |
| GND (Pin 5) | Ground Reference | Return path for REF divider and output stage; separate from power ground in split-ground layouts. |
| REF (Pin 6) | Output Common-Mode Reference | Sets VOUT mid-point; externally programmable from 1.125V to V+–1.125V. |
| OUT (Pin 7) | Amplified Output | Drives 200pF directly; requires ≥100Ω series resistor for larger capacitive loads. |
| SHDN (Pin 8) | Shutdown Control | Pull ≤0.5V to enter <10µA shutdown; floating defaults to active via 2µA internal pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-Optimized Pinout | Pin 3 designated NC eliminates risk of shorting +IN/–IN during misalignment or solder bridging. |
| AEC-Q100 Qualified | Grade H (–40°C to 125°C) certification confirms reliability for automotive powertrain and chassis modules. |
| Bidirectional Sensing | Output polarity relative to REF indicates current direction-enables regenerative braking detection. |
| High CMRR | ≥96dB at DC and ≥75dB at 100kHz-rejects noise from high-dv/dt switching nodes in inverters. |
| Fast Common-Mode Recovery | 1.3µs recovery from ±50V step-maintains accuracy during rapid bus voltage transients in DC-DC converters. |
Applications
| Automotive H-Bridge Motor Control | Industrial 48V Battery Management |
|---|---|
Use Scenario: Monitoring bidirectional armature current in electric power steering (EPS) or HVAC blower motors with 48V battery supply. IC Role / Device Role / Timing Role: High-side current sense amplifier providing real-time feedback to MCU-based field-oriented control (FOC) loop. Use Value: 50V/V gain and 80V common mode enable direct sensing without level-shifting; FMEA pinout reduces ASIL-B compliance effort. | Use Scenario: Measuring charge/discharge current in telecom or data center 48V backup battery banks with >60V transient tolerance. IC Role / Device Role / Timing Role: Precision shunt amplifier feeding isolated ADC in battery protection unit (BPU) for state-of-charge calculation. Use Value: –5V to 80V input range accommodates negative ground faults and positive transients; 1.2MHz bandwidth captures pulse charging profiles. |
| Switching Power Supply Current Monitoring | Fuse and MOSFET Health Monitoring |
Use Scenario: Sensing inductor current in synchronous buck converters for server VRMs operating at 500kHz–1MHz switching frequency. IC Role / Device Role / Timing Role: High-bandwidth current monitor feeding peak-current-mode PWM controller with minimal phase lag. Use Value: 1.2MHz bandwidth and 2.5µs settling time ensure accurate cycle-by-cycle current limiting without instability. | Use Scenario: Detecting overcurrent and open-circuit conditions in high-reliability industrial I/O modules using discrete MOSFET switches. IC Role / Device Role / Timing Role: Fault-detection amplifier comparing shunt voltage against comparator threshold in safety PLC outputs. Use Value: ±0.5% gain accuracy over temperature ensures consistent trip thresholds across ambient; shutdown mode enables low-power fault logging. |
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, 80V common mode, 10ppm/°C offset drift, SOIC-8 package | Lacks FMEA pinout and AEC-Q100 Grade H; rated –40°C to 125°C but not qualified to automotive standard | Select when cost sensitivity outweighs ASIL requirements and SOIC layout is preferred. |
| MAX40056ATA+T | 50V/V gain, 65V common mode, 1.5MHz bandwidth, 8-pin TDFN with thermal pad | Lower common mode range limits use in 72V systems; no AEC-Q100 qualification; smaller footprint increases thermal stress in high-power apps | Select for space-constrained industrial designs where 65V CM range suffices and thermal management is feasible. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999HMS8-50F#WPBF uniquely combines AEC-Q100 Grade H qualification, FMEA-optimized MSOP pinout, and 80V common mode range-making it the only option qualified for high-voltage automotive traction inverter current monitoring without external level-shifting.
Availability
LT1999HMS8-50F#WPBF is available at Aetrix Electronics and suitable for automotive H-bridge motor control, industrial 48V battery management, and switching power supply current monitoring requiring stable component supply across extended temperature ranges.
Supply support for LT1999HMS8-50F#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 safety-critical power conversion and motor control systems-designed specifically to meet AEC-Q100 and functional safety requirements in automotive and industrial environments.
FAQ
What is the maximum common mode voltage supported by the LT1999HMS8-50F#WPBF?
The LT1999HMS8-50F#WPBF supports a guaranteed input common mode voltage range of –5V to 80V across its full operating temperature range (–40°C to 125°C). This allows direct high-side sensing in 48V and 60V automotive and industrial systems without external level-shifting circuitry. Operation beyond 80V may trigger ESD clamps and is not recommended.
How does the FMEA-optimized pinout of the LT1999HMS8-50F#WPBF improve system reliability?
The LT1999HMS8-50F#WPBF uses an FMEA-optimized MSOP pinout where Pin 3 is designated NC (no connect). This prevents catastrophic failure modes such as accidental shorting of +IN and –IN during PCB assembly or connector misalignment-reducing risk in ASIL-B automotive applications. Unlike standard MSOP variants, this layout eliminates single-point wiring errors that could cause false current readings or device latch-up.
Can the LT1999HMS8-50F#WPBF operate with a supply voltage lower than 4.5V?
The LT1999HMS8-50F#WPBF is specified for 4.5V to 5.5V operation, and all guaranteed specifications apply within this range. While operation down to ~4V is possible per the datasheet, performance-including gain accuracy, offset, and bandwidth-is not characterized or tested below 4.5V. For automotive systems with brown-out conditions, use of a 5V LDO regulator is strongly recommended to maintain LT1999HMS8-50F#WPBF specification compliance.
What is the purpose of the REF pin on the LT1999HMS8-50F#WPBF, and what voltage range can it accept?
The REF pin on the LT1999HMS8-50F#WPBF sets the output common-mode voltage level. By default, it floats at mid-supply (2.5V @ 5V V+) via internal 160kΩ resistors. It can be driven externally within 1.125V to V+–1.125V (i.e., 1.125V to 3.875V @ 5V), allowing alignment with ADC reference voltages or isolation barrier levels. REF pin rejection is 62dB, ensuring output stability despite minor REF rail noise.
Does the LT1999HMS8-50F#WPBF require external compensation for capacitive loads?
Yes-the LT1999HMS8-50F#WPBF can drive up to 200pF capacitively without external compensation. For loads exceeding 200pF (e.g., long traces or ADC input capacitance), a minimum 100Ω series resistor must be placed between OUT and the load to maintain stability and prevent peaking or oscillation. This requirement is explicitly stated in the Pin Functions section and confirmed in typical performance curves showing degraded phase margin beyond 200pF.
LT1999HMS8-50F#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:
- 1.2 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
LT1999HMS8-50F#WPBF FAQ
1.How can I place an order for LT1999HMS8-50F#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999HMS8-50F#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 LT1999HMS8-50F#WPBF reliable?
The price and inventory of LT1999HMS8-50F#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999HMS8-50F#WPBF is usually 5 days.
3.What payment methods are accepted for LT1999HMS8-50F#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999HMS8-50F#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999HMS8-50F#WPBF?
LT1999HMS8-50F#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999HMS8-50F#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 LT1999HMS8-50F#WPBF?
For technical support, including LT1999HMS8-50F#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999HMS8-50F#WPBF requirements.
6.How does Aetrix verify that LT1999HMS8-50F#WPBF is sourced from the original manufacturer or authorized distributors?
All LT1999HMS8-50F#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 LT1999HMS8-50F#WPBF meets industry standards.
7.What is the process for return or replacement of LT1999HMS8-50F#WPBF?
All LT1999HMS8-50F#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999HMS8-50F#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 LT1999HMS8-50F#WPBF part is unused and in its original packaging.
Return procedure for LT1999HMS8-50F#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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