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Analog Devices Inc. LT1999CMS8-10F#PBF
- Part No.:
- LT1999CMS8-10F#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999CMS8-10F#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
LT1999CMS8-10F#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 10V/V fixed gain, –5V to 80V input common mode range, 2MHz bandwidth, and MSOP-8 FMEA-optimized pinout. 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 control and battery charge/discharge systems.
For engineers reviewing the LT1999CMS8-10F#PBF datasheet, LT1999CMS8-10F#PBF pinout, LT1999CMS8-10F#PBF application, or LT1999CMS8-10F#PBF equivalent, this device supports high-side/low-side sensing in automotive-grade power systems requiring AEC-Q100 compliance, fast common-mode step recovery (0.8µs), and shutdown current <10µA.
Technical Context
The LT1999CMS8-10F#PBF uses matched internal 4kΩ input resistors and transconductance-based signal path to achieve smooth, continuous operation across its full –5V to 80V common mode range. Its architecture includes integrated 160kΩ/160kΩ REF divider and 2µA internal SHDN pull-up, enabling mid-supply reference without external components.
It features differential input impedance of 8kΩ (typ), CMRR >96dB over full VCM range, and AC CMRR >80dB at 100kHz. The output stage drives ≥200pF directly and provides ±31mA sourcing/sinking capability with 0.15Ω output impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V ±0.5% - enables direct conversion of ±350mV shunt voltage to ±3.5V output for ADC interfacing |
| Common Mode Range | –5V to 80V - supports high-side sensing in 48V industrial systems and low-side sensing down to negative rail |
| Bandwidth | 2MHz - captures fast current transients in PWM-controlled motor drives and switching power supplies |
| Input Offset Voltage | ±1.5mV max - ensures ≤0.15% error at full-scale sense voltage (±350mV) |
| Supply Current | 1.55mA active / <10µA shutdown - reduces system power budget in always-on battery monitoring |
| Operating Temp | 0°C to 70°C - specified for commercial applications with extended reliability validation per C-grade spec |
| ESD Rating | 4kV HBM / 1kV CDM - withstands handling and board-level ESD events in automated assembly |
Pinout & Package
Package: 8-Lead Plastic MSOP 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).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Positive sense input | Connects to high-potential side of shunt; matched 4kΩ input impedance minimizes gain error vs. VCM |
| –IN (Pin 2) | Negative sense input | Connects to low-potential side of shunt; differential pair rejects common-mode noise up to 80V |
| NC (Pin 3) | No connect | FMEA-optimized layout eliminates unintended current paths during fault conditions |
| V+ (Pin 4) | Power supply | 4.5V–5.5V supply; pins 1 and 4 are internally tied - allows single-point decoupling |
| GND (Pin 5) | Ground reference | Return path for REF divider and output stage; separate from power ground improves PSRR |
| REF (Pin 6) | Output common-mode reference | Default mid-supply (2.5V); externally overdrivable from 1.25V to V+–1.25V for custom level-shifting |
| OUT (Pin 7) | Amplified output | Low-impedance (0.15Ω) rail-to-rail capable output; drives 1kΩ loads with <250mV headroom |
| 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 |
|---|---|
| Bidirectional sensing | Outputs positive/negative voltage relative to REF to indicate current direction through shunt |
| FMEA-optimized pinout | NC on Pin 3 prevents short-circuit faults between +IN/–IN during solder bridging or trace damage |
| Fast common-mode recovery | 0.8µs recovery from ±50V VCM step - maintains accuracy during PWM edge transitions |
| AEC-Q100 qualified | Validated for automotive applications including solenoid control and battery management |
| Internal REF divider | Matched 160kΩ/160kΩ network sets default 2.5V REF - eliminates external resistor matching errors |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Monitoring bidirectional armature current in 24V/48V brushed DC motor drives with PWM commutation. IC Role / Device Role / Timing Role: High-side current sense amplifier providing real-time magnitude/direction feedback to MCU for torque regulation and stall detection. Use Value: 2MHz bandwidth captures PWM-edge current spikes; –5V to 80V VCM range accommodates bootstrap gate drive offsets. | Use Scenario: Measuring energizing/de-energizing current in automotive fuel injectors or transmission solenoids. IC Role / Device Role / Timing Role: Low-latency current monitor feeding closed-loop control to prevent coil overheating during rapid duty-cycle changes. Use Value: 0.8µs common-mode recovery ensures accurate current reading within 1µs after switch turn-on transient. |
| Battery Charge/Discharge Monitoring | PWM-Controlled Power Supply |
Use Scenario: Bidirectional current measurement in Li-ion battery packs from full charge (+3A) to deep discharge (–3A). IC Role / Device Role / Timing Role: Precision shunt amplifier feeding coulomb counter or protection IC with polarity-aware analog output. Use Value: ±1.5mV offset ensures <0.5% full-scale error over temperature; shutdown mode extends battery life during sleep. | Use Scenario: Output current sensing in isolated DC-DC converters with synchronous rectification. IC Role / Device Role / Timing Role: High-bandwidth current feedback element in voltage-mode or current-mode control loops. Use Value: 2MHz bandwidth supports >500kHz switching frequencies; 96dB CMRR rejects transformer leakage-induced noise. |
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 | 500kHz bandwidth, 80V VCM, 20V/V gain option only; no FMEA pinout | Lower bandwidth limits use in >200kHz PWM systems; requires external REF biasing | Select when cost sensitivity outweighs need for 2MHz response or FMEA layout assurance |
| MAX40056ATA+T | 1.5MHz bandwidth, 65V VCM, 10V/V gain; SO-8 package only, no MSOP-FMEA variant | Lacks NC pin for fault mitigation; higher 2.5mV offset increases full-scale error | Choose for legacy SO-8 footprint compatibility where FMEA optimization is not required |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999CMS8-10F#PBF delivers superior bandwidth (2MHz), guaranteed FMEA-optimized layout, and tighter offset (±1.5mV), making it optimal for high-dynamic-range automotive and industrial motor control where transient fidelity and fault resilience are critical.
Availability
LT1999CMS8-10F#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, solenoid actuation, and battery management systems requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LT1999CMS8-10F#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 power systems, with design emphasis on wide common-mode range, fast transient response, and robust fault tolerance in automotive and industrial environments.
FAQ
What is the exact gain accuracy specification for LT1999CMS8-10F#PBF?
The LT1999CMS8-10F#PBF has a gain accuracy of ±0.5% maximum over temperature (0°C to 70°C), verified at full-scale input (±350mV differential) with output swing within supply rails. This is achieved via laser-trimmed internal 4kΩ input resistors and matched on-chip gain-setting resistor network.
Does LT1999CMS8-10F#PBF support both high-side and low-side current sensing?
Yes, LT1999CMS8-10F#PBF supports both configurations: its –5V to 80V input common mode range allows connection above or below ground. For high-side sensing, +IN connects to load side of shunt; for low-side, –IN connects to ground side - polarity of VOUT relative to REF indicates current direction in either case.
What is the purpose of the NC pin (Pin 3) in LT1999CMS8-10F#PBF's FMEA-optimized pinout?
The NC pin (Pin 3) in LT1999CMS8-10F#PBF is intentionally unconnected to prevent short-circuit faults between +IN (Pin 1) and –IN (Pin 2) during PCB manufacturing defects like solder bridging or trace damage. This physical separation enhances functional safety compliance in automotive and industrial applications.
How does the REF pin function in LT1999CMS8-10F#PBF, and what voltage range is supported?
The REF pin in LT1999CMS8-10F#PBF sets the output common-mode level. Internally biased to 2.5V (mid-supply) by 160kΩ/160kΩ divider, it can be overdriven externally from 1.25V to V+–1.25V (i.e., 1.25V to 3.75V at 5V supply). This enables flexible level-shifting for ADC input ranges or differential receiver interfaces.
What shutdown current does LT1999CMS8-10F#PBF draw, and how is shutdown activated?
LT1999CMS8-10F#PBF draws <10µA in shutdown mode, activated by pulling SHDN (Pin 8) to ≤0.5V relative to GND. When floating, an internal 2µA pull-up current source keeps the device active. Turn-on/turn-off time is 1µs, enabling rapid power cycling in burst-mode systems.
LT1999CMS8-10F#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1999CMS8-10F#PBF FAQ
1.How can I place an order for LT1999CMS8-10F#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999CMS8-10F#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 LT1999CMS8-10F#PBF reliable?
The price and inventory of LT1999CMS8-10F#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999CMS8-10F#PBF is usually 5 days.
3.What payment methods are accepted for LT1999CMS8-10F#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999CMS8-10F#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999CMS8-10F#PBF?
LT1999CMS8-10F#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999CMS8-10F#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 LT1999CMS8-10F#PBF?
For technical support, including LT1999CMS8-10F#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999CMS8-10F#PBF requirements.
6.How does Aetrix verify that LT1999CMS8-10F#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999CMS8-10F#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 LT1999CMS8-10F#PBF meets industry standards.
7.What is the process for return or replacement of LT1999CMS8-10F#PBF?
All LT1999CMS8-10F#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999CMS8-10F#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 LT1999CMS8-10F#PBF part is unused and in its original packaging.
Return procedure for LT1999CMS8-10F#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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