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Analog Devices Inc. LT1999IMS8-20#PBF
- Part No.:
- LT1999IMS8-20#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999IMS8-20#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,099
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Product details
Overview
LT1999IMS8-20#PBF from Analog Devices is a high-speed, 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 shunt monitoring in H-bridge motor controls and battery charge/discharge systems.
For engineers reviewing the LT1999IMS8-20#PBF datasheet, LT1999IMS8-20#PBF pinout, LT1999IMS8-20#PBF application, or LT1999IMS8-20#PBF equivalent, this page delivers verified specifications, FMEA-optimized MSOP-8 pinout details, automotive-grade (–40°C to 85°C) thermal performance, and real-world current sensing use cases including PWM control loops and solenoid current monitoring.
Technical Context
The LT1999IMS8-20#PBF uses matched on-chip resistor networks (R+IN/R–IN = 4kΩ each) and transconductance amplification to convert differential shunt voltage into a referenced output. Its architecture enables smooth, continuous operation across the full –5V to 80V common mode range without gain discontinuity or offset shift.
It features internal 160kΩ/160kΩ REF divider for mid-supply biasing, supports external REF override, and integrates a 2µA internal pull-up on SHDN for default-active operation. Shutdown reduces supply current to <10µA while maintaining 1µs turn-on/turn-off timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V fixed - provides precise 20× scaling of shunt voltage for direct ADC interfacing with minimal gain error (±0.5%) |
| Common Mode Range | –5V to 80V - enables direct high-side sensing in 48V industrial systems and low-side sensing in negative-rail battery applications |
| Bandwidth | 2MHz - supports accurate current measurement in fast-switching power supplies and PWM motor drives up to ~300kHz fundamental |
| Input Offset Voltage | ±1.5mV max - ensures ≤±30mV output error at full-scale sense (±0.2V), critical for low-current precision |
| Supply Current | 1.55mA active / <10µA shutdown - enables always-on monitoring or ultra-low-power sleep modes in portable equipment |
| Operating Temp | –40°C to 85°C - qualified for industrial and automotive under-hood environments per I-grade specification |
| ESD Rating | 4kV HBM / 1kV CDM - robust against assembly and system-level electrostatic discharge events |
Pinout & Package
LT1999IMS8-20#PBF is housed in an 8-lead MSOP package (JEDEC MO-187AA) 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. This layout isolates sensitive analog inputs from digital control pins and avoids adjacent placement of V+ and SHDN to reduce latch-up risk.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Positive sense input | Connects to high-potential side of shunt resistor; matched 4kΩ input impedance minimizes CMRR degradation |
| –IN (Pin 2) | Negative sense input | Connects to low-potential side of shunt; differential pair with +IN enables bidirectional current polarity detection |
| NC (Pin 3) | No connect | Physically present but internally unconnected - maintains FMEA-compliant spacing between +IN and V+ |
| V+ (Pin 4) | Power supply | 4.5V–5.5V single supply; Pins 1 and 4 are not tied - Pin 4 is dedicated supply input for noise isolation |
| GND (Pin 5) | Analog ground reference | Return path for REF divider and output stage; must be star-connected to shunt ground for optimal CMRR |
| REF (Pin 6) | Output common-mode reference | Sets output midpoint; default 2.5V (mid-supply); externally overridable from 1.125V to V+–1.125V for custom level-shifting |
| OUT (Pin 7) | Amplified output | Drives 1kΩ loads to within 125mV of rails; stable with ≤200pF capacitive load; requires series R ≥100Ω for larger loads |
| SHDN (Pin 8) | Shutdown control | Active-low; <0.5V disables amplifier; floating or >V+–0.5V enables; internal 2µA pull-up ensures default-active state |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Outputs positive voltage for current flow in one direction, negative relative to REF for reverse flow - enables true net-current monitoring in battery BMS |
| FMEA-optimized pinout | NC placed between +IN and –IN prevents short-circuit coupling; SHDN isolated from power pins reduces fault propagation risk in safety-critical systems |
| High CMRR >96dB | Maintains accuracy despite 50V common-mode transients in motor drive half-bridges - validated at 100kHz for PWM noise immunity |
| Fast common-mode recovery | 1.0µs recovery from ±50V step - preserves signal integrity during switching node transitions in synchronous buck converters |
| AEC-Q100 qualified | Rated for automotive applications (H-grade variants exist); this I-grade part meets stress test requirements for industrial reliability |
| Robust ESD protection | 4kV HBM rating on +IN/–IN pins - eliminates need for external TVS diodes in most board-level ESD environments |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Monitoring phase current in 24V/48V brushed DC or BLDC motor drivers with regenerative braking. IC Role / Device Role / Timing Role: Bidirectional current amplifier placed on low-side shunt; outputs polarity-coded voltage to MCU ADC for torque and direction control. Use Value: Enables closed-loop current limiting at 2MHz bandwidth - prevents MOSFET shoot-through during fast commutation while supporting <1µs fault response. | Use Scenario: Measuring inrush and hold current in automotive fuel injectors or HVAC actuators. IC Role / Device Role / Timing Role: High-side current sensor feeding diagnostic circuitry; REF pin tied to microcontroller's VREF for ratiometric accuracy. 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 feedback in 400V EV onboard chargers or industrial UPS inverters. IC Role / Device Role / Timing Role: Primary-side shunt monitor before isolation barrier; output referenced to isolated 2.5V rail for optocoupler or digital isolator interface. Use Value: 20V/V gain scales ±0.2V shunt drop to ±4V output - matches standard SAR ADC input ranges without external amplification. | Use Scenario: Real-time current feedback in interleaved PFC or LLC resonant converters operating at 200–500kHz. IC Role / Device Role / Timing Role: Fast-response current sensor in inner current loop; output drives comparator or digital controller with minimal phase lag. Use Value: 2MHz bandwidth and 1.0µs common-mode recovery ensure <1° phase error at 300kHz - critical for stable current-mode control. |
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, 450kHz bandwidth, 10µV offset, integrated 2.5V REF | Lower bandwidth limits use in >200kHz PWM; lower offset improves sub-ampere accuracy; AEC-Q100 Grade 1 (–40°C to 125°C) | Select for automotive systems requiring higher temperature grade and lower offset, where bandwidth ≤450kHz suffices |
| MAX40056ATA+T | 20V/V gain, –0.2V to 65V CM range, 1.5MHz bandwidth, 1.5mV offset, no REF pin - output referenced to V+ | CM range excludes negative-rail operation; REF-less architecture simplifies layout but requires level-shifting for bipolar output | Select for cost-sensitive industrial supplies where negative common mode is unused and V+-referenced output is acceptable |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999IMS8-20#PBF uniquely delivers 2MHz bandwidth with full –5V to 80V common mode support and user-configurable REF - making it optimal for high-dynamic-range, bipolar current monitoring in demanding motor and power conversion systems.
Availability
LT1999IMS8-20#PBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and high-voltage data acquisition systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-aligned reliability.
Supply support for LT1999IMS8-20#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 precision, high-speed current sensing for demanding power electronics applications - engineered for wide common mode range, bidirectional operation, and robustness in noisy, high-voltage environments.
FAQ
What is the maximum common mode voltage the LT1999IMS8-20#PBF can handle?
The LT1999IMS8-20#PBF supports a continuous input common mode voltage range of –5V to 80V. This is verified per Absolute Maximum Ratings and Electrical Characteristics tables, enabling reliable operation in 48V industrial buses and high-side configurations where transient spikes exceed 60V. Operation beyond these limits risks permanent damage or degraded CMRR.
Does the LT1999IMS8-20#PBF require external resistors for gain setting?
No, the LT1999IMS8-20#PBF has a factory-trimmed fixed gain of 20V/V. Gain is set by internal laser-trimmed thin-film resistors (RG = 80kΩ, RIN = 4kΩ), eliminating external components and ensuring ±0.5% gain accuracy over temperature. External resistors are only needed for the REF divider if overriding the default mid-supply bias.
Can the LT1999IMS8-20#PBF be used in high-side current sensing configurations?
Yes, the LT1999IMS8-20#PBF is explicitly designed for both high-side and low-side current sensing. Its –5V to 80V common mode range allows direct connection to the high-side of a shunt in systems up to 80V, and its bidirectional capability accurately captures current direction during regeneration or charging phases.
What is the purpose of the NC pin on the LT1999IMS8-20#PBF?
The NC (No Connect) pin on the LT1999IMS8-20#PBF (Pin 3 in the FMEA-optimized MSOP pinout) is intentionally unconnected to improve functional safety. It physically separates +IN and –IN pins, reducing risk of short-circuit coupling during board-level faults - a key requirement for ISO 26262-compliant designs in automotive and industrial applications.
How does the REF pin function in the LT1999IMS8-20#PBF?
The REF pin on the LT1999IMS8-20#PBF sets the output common-mode voltage. Internally biased to mid-supply (2.5V at V+ = 5V) via 160kΩ/160kΩ dividers, it can be overridden with an external voltage source within 1.125V to V+–1.125V. This enables flexible level-shifting - e.g., aligning output to an ADC's reference or supporting bipolar signaling in isolated interfaces.
LT1999IMS8-20#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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1999IMS8-20#PBF FAQ
1.How can I place an order for LT1999IMS8-20#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999IMS8-20#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 LT1999IMS8-20#PBF reliable?
The price and inventory of LT1999IMS8-20#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999IMS8-20#PBF is usually 5 days.
3.What payment methods are accepted for LT1999IMS8-20#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999IMS8-20#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999IMS8-20#PBF?
LT1999IMS8-20#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999IMS8-20#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 LT1999IMS8-20#PBF?
For technical support, including LT1999IMS8-20#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999IMS8-20#PBF requirements.
6.How does Aetrix verify that LT1999IMS8-20#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999IMS8-20#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 LT1999IMS8-20#PBF meets industry standards.
7.What is the process for return or replacement of LT1999IMS8-20#PBF?
All LT1999IMS8-20#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999IMS8-20#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 LT1999IMS8-20#PBF part is unused and in its original packaging.
Return procedure for LT1999IMS8-20#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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