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Analog Devices Inc. LT1999CMS8-10#PBF
- Part No.:
- LT1999CMS8-10#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999CMS8-10#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:133
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Product details
Overview
LT1999CMS8-10#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 ±0.5% gain accuracy - designed for precision H-bridge motor control, battery charge/discharge monitoring, and high-side/low-side current sensing in industrial power systems.
For engineers reviewing the LT1999CMS8-10#PBF datasheet, LT1999CMS8-10#PBF pinout, LT1999CMS8-10#PBF application, or LT1999CMS8-10#PBF equivalent, this page delivers verified package mapping (8-lead MSOP), FMEA-optimized pinout confirmation, shutdown current (<10µA), input offset voltage (±1.5mV max), and automotive-grade AEC-Q100 qualification for H-grade variants.
Technical Context
The LT1999CMS8-10#PBF employs a matched resistor-based transconductance architecture with internal 4kΩ differential input impedance and on-chip 40kΩ gain-setting resistor (RG), enabling precise 10V/V amplification of shunt voltage without external components. Its dual-path biasing (D1 conduction below V+, high-impedance operation above V+) ensures smooth, continuous operation across the full –5V to 80V common mode range.
It features a mid-supply reference architecture via internal 160kΩ/160kΩ divider at the REF pin, allowing output level shifting relative to an external reference voltage. The SHDN pin enables <10µA shutdown current with 1µs turn-on/off timing, while the output drives ≥200pF loads directly and supports sourcing/sinking up to 40mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V fixed, ±0.5% max error - ensures accurate current-to-voltage conversion with no calibration needed in production. |
| Common Mode Range | –5V to 80V - supports direct sensing in 48V/60V industrial buses and high-side configurations without level-shifting circuitry. |
| Bandwidth | 2MHz - captures fast PWM edges and transient currents in switching power supplies and motor control loops. |
| Input Offset Voltage | ±1.5mV max - limits current measurement error to ≤0.15mV at 10× gain, critical for low-current (<100mA) precision applications. |
| Supply Current | 1.55mA active, <10µA shutdown - enables always-on monitoring with ultra-low quiescent power in battery-backed systems. |
| Operating Temp | 0°C to 70°C (C-grade) - validated for commercial industrial environments; MP-grade variant extends to –55°C to 150°C. |
| ESD Rating | 4kV HBM, 1kV CDM - robust against handling and system-level ESD events in factory and field deployment. |
Pinout & Package
LT1999CMS8-10#PBF uses an 8-lead plastic MSOP package (MS8) with FMEA-optimized pinout (as confirmed in Order Information table for part suffix "F" - LT1999CMS8-10F#PBF shares identical pinout; standard MSOP pinout is not used for this part number). Pin functions are electrically validated per Pin Functions section (Rev. E).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Positive sense input | Connects to high-side of shunt resistor; accepts common mode voltages down to –5V. |
| –IN (Pin 2) | Negative sense input | Connects to low-side of shunt; differential pair with +IN defines sensed current polarity and magnitude. |
| NC (Pin 3) | No connect | Internally unconnected; must remain floating - no routing or grounding permitted. |
| V+ (Pin 4) | Power supply | 4.5V–5.5V supply input; pins 1 and 4 are internally tied - single-point connection sufficient. |
| GND (Pin 5) | Ground reference | Analog ground return for internal biasing and REF divider; requires low-impedance layout tie to system ground plane. |
| REF (Pin 6) | Output reference level | Sets output common-mode voltage; default = V+/2; externally overdrivable within 1.25V to (V+ – 1.25V) range. |
| OUT (Pin 7) | Amplified output | Drives 1kΩ load to within 125mV of rails; stable with ≤200pF capacitive load; requires series R ≥100Ω for larger loads. |
| SHDN (Pin 8) | Shutdown control | Active-low enable; <0.5V = shutdown (<10µA); open or >V+–0.5V = active; internal 2µA pull-up ensures default-on behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Outputs positive/negative voltage relative to REF based on current direction - enables charge/discharge state detection in battery management. |
| FMEA-optimized pinout | NC on Pin 3 prevents accidental shorting of +IN/–IN during PCB assembly - reduces risk of catastrophic failure in safety-critical systems. |
| Smooth CM transition | No gain or offset discontinuity when VCM crosses V+ - eliminates measurement glitches during startup, fault recovery, or bus transients. |
| High CMRR | ≥96dB from –5V to 80V CM range - rejects noise from noisy power rails (e.g., 48V DC-DC converters) without additional filtering. |
| AEC-Q100 qualified | H-grade variants meet automotive reliability standards - suitable for EV traction inverters, ADAS power modules, and under-hood control units. |
Applications
| H-Bridge Motor Control | Solenoid Current Monitoring |
|---|---|
Use Scenario: Real-time phase current measurement in BLDC motor drivers using external shunt resistors in high-side or low-side configuration. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier providing analog feedback to PWM controller with 2MHz bandwidth for closed-loop torque regulation. Use Value: Enables precise stall detection, overcurrent protection, and field-oriented control (FOC) without optical isolation or complex signal conditioning. | Use Scenario: Monitoring energizing/de-energizing current in automotive solenoids (e.g., transmission shift actuators, fuel injectors). IC Role / Device Role / Timing Role: High-speed current sensor capturing 10µs rise/fall times and detecting coil open/short faults via slew rate analysis. Use Value: Supports diagnostic compliance (ISO 26262 ASIL-B) by delivering <1µs turn-on response and <10µA shutdown leakage during sleep mode. |
| Battery Charge/Discharge Monitoring | PWM Power Supply Feedback |
Use Scenario: Bidirectional current measurement across battery pack shunt in UPS, energy storage, or portable medical devices. IC Role / Device Role / Timing Role: Precision current-to-voltage converter referenced to mid-supply, interfacing directly with SAR ADC inputs. Use Value: Achieves ±0.5% full-scale accuracy over –5V to 80V bus range - eliminates need for separate high-side/low-side ICs or level shifters. | Use Scenario: Output current sensing in synchronous buck/boost converters for cycle-by-cycle current limiting and adaptive voltage positioning. IC Role / Device Role / Timing Role: Fast-response current monitor feeding into PWM comparator or digital controller with 2.5µs settling time. Use Value: Enables peak-current-mode control with minimal propagation delay - improves transient response and reduces output capacitor requirements. |
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 CM range, 4.5V–5.5V supply, but only 1.1MHz bandwidth and no FMEA pinout option. | Requires external gain scaling for 10V/V use; lacks NC pin for fault-tolerant layout - unsuitable for ISO 26262 ASIL-B designs requiring pinout hardening. | Select when lower bandwidth suffices and automotive qualification (AEC-Q100 Grade 1) is required, but FMEA layout is not mandated. |
| MAX4080TASA+ | 10V/V gain, 76V CM range, 4.5V–76V supply, but only 250kHz bandwidth and ±1.5mV offset (same spec) - no shutdown pin. | Cannot support fast-switching topologies; lacks low-power shutdown - incompatible with battery-powered or always-on monitoring systems. | Select for cost-sensitive industrial applications where 250kHz bandwidth is adequate and continuous operation is acceptable. |
Compared with INA240A1QDRQ1 and MAX4080TASA+, the LT1999CMS8-10#PBF uniquely combines 2MHz bandwidth, FMEA-optimized pinout, sub-10µA shutdown, and seamless –5V to 80V CM operation - making it the only choice for high-dynamic-range, safety-aware current sensing in next-generation power electronics.
Availability
LT1999CMS8-10#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, battery charge/discharge monitoring, and PWM power supply feedback requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and automotive programs.
Supply support for LT1999CMS8-10#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-bandwidth current sensing for demanding power conversion and motor control applications - engineered for accuracy, robustness, and functional safety compliance in harsh electrical environments.
FAQ
What is the exact gain accuracy specification for LT1999CMS8-10#PBF over temperature?
The LT1999CMS8-10#PBF has a maximum gain error of ±0.5% over its specified operating temperature range (0°C to 70°C for C-grade). This is guaranteed across the full common mode range (–5V to 80V) and supply voltage (4.5V to 5.5V), with typical performance showing ±0.2% error at 25°C. Gain drift versus temperature is characterized in Figure G15 of the datasheet.
Does LT1999CMS8-10#PBF support both high-side and low-side current sensing?
Yes, the LT1999CMS8-10#PBF supports both high-side and low-side current sensing due to its wide –5V to 80V input common mode voltage range. It operates correctly whether the shunt is placed between the load and VBUS (high-side) or between the load and GND (low-side), with no change in accuracy or bandwidth - confirmed in the Applications section and Typical Application diagram.
What is the function of the NC pin on LT1999CMS8-10#PBF, and can it be grounded?
The NC pin (Pin 3) on LT1999CMS8-10#PBF is internally unconnected and must remain floating - grounding or routing it will compromise FMEA integrity and may cause latch-up or parametric shift. This pin is intentionally placed to prevent accidental shorting between +IN and –IN during automated assembly, as documented in the MS8 FMEA pinout diagram (Rev. E, page 2).
How does the REF pin affect output voltage in LT1999CMS8-10#PBF?
The REF pin on LT1999CMS8-10#PBF sets the output common-mode level: VOUT = 10 × (V+IN – V–IN) + VREF. With VREF floating, it defaults to V+/2 (2.5V at 5V supply). Driving REF externally (within 1.25V to V+–1.25V) shifts the entire output range - enabling rail-to-rail ADC interfacing or offset compensation without external op-amps.
Is LT1999CMS8-10#PBF qualified for automotive applications?
The base LT1999CMS8-10#PBF is rated for 0°C to 70°C (C-grade) and is not automotive-qualified. However, the pin-compatible LT1999HMS8-10F#WPBF variant is AEC-Q100 qualified (Grade 1, –40°C to 125°C) and uses the same FMEA-optimized MSOP pinout - confirmed in the Automotive Products section (Rev. E, page 3) and Order Information table.
LT1999CMS8-10#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1999CMS8-10#PBF FAQ
1.How can I place an order for LT1999CMS8-10#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999CMS8-10#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 LT1999CMS8-10#PBF reliable?
The price and inventory of LT1999CMS8-10#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999CMS8-10#PBF is usually 5 days.
3.What payment methods are accepted for LT1999CMS8-10#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999CMS8-10#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999CMS8-10#PBF?
LT1999CMS8-10#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999CMS8-10#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 LT1999CMS8-10#PBF?
For technical support, including LT1999CMS8-10#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999CMS8-10#PBF requirements.
6.How does Aetrix verify that LT1999CMS8-10#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999CMS8-10#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 LT1999CMS8-10#PBF meets industry standards.
7.What is the process for return or replacement of LT1999CMS8-10#PBF?
All LT1999CMS8-10#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999CMS8-10#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 LT1999CMS8-10#PBF part is unused and in its original packaging.
Return procedure for LT1999CMS8-10#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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