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Analog Devices Inc. LT1999CS8-10#PBF
- Part No.:
- LT1999CS8-10#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1999CS8-10#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,801
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Product details
Overview
LT1999CS8-10#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. It senses current via external shunt resistor and outputs a voltage referenced to mid-supply or external REF, enabling precise H-bridge motor current monitoring in industrial power supplies.
For engineers reviewing the LT1999CS8-10#PBF datasheet, LT1999CS8-10#PBF pinout, LT1999CS8-10#PBF application, or LT1999CS8-10#PBF equivalent, key selection criteria include common mode voltage tolerance, shutdown current (<10µA), input offset voltage (±1.5mV max), and SO-8 package compatibility with high-side/low-side sensing layouts.
Technical Context
The LT1999CS8-10#PBF uses a transconductance-based architecture with matched internal 4kΩ sense resistors and a transresistance output stage. Its differential input structure enables seamless operation across –5V to 80V common mode, with no gain discontinuity at V+ boundary due to integrated D1 biasing network for sub-supply operation.
It features a dedicated REF pin for output level shifting, internal 160kΩ/160kΩ divider for default mid-supply reference, and SHDN pin with 2µA internal pull-up. The output drives ≥200pF loads directly and supports sourcing/sinking up to 40mA with rail-to-rail swing capability relative to V+ and GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V fixed - delivers 10× sensed differential voltage (±0.35V full-scale) with <0.5% error over temperature. |
| Common Mode Range | –5V to 80V - supports direct high-side sensing in 48V/60V systems without level-shifting circuitry. |
| Bandwidth | 2MHz - enables accurate current measurement in fast-switching PWM control loops (e.g., 500kHz–1MHz converters). |
| Input Offset Voltage | ±1.5mV max - ensures ≤150µV output error at 10× gain, critical for low-current shunt applications. |
| Supply Current | 1.55mA active / <10µA shutdown - reduces system power in battery-backed or standby-critical designs. |
| Operating Temp | 0°C to 70°C - specified performance range for commercial-grade LT1999CS8-10#PBF in non-automotive industrial use. |
| ESD Rating | 4kV HBM, 1kV CDM - robust handling during PCB assembly and field service in noisy industrial environments. |
Pinout & Package
LT1999CS8-10#PBF is housed in an 8-lead plastic SO (narrow) package (S8), RoHS-compliant, with standard SOIC footprint (5.0mm × 4.0mm, 1.27mm pitch). Pin 1 marked by notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 4) | Power supply input | Internally tied pins accepting 4.5V–5.5V; dual connection improves PSRR and thermal stability. |
| +IN (Pin 2) | Positive sense input | High-impedance node (≥5MΩ) for connection to shunt's high-potential side in high-side or low-side configurations. |
| –IN (Pin 3) | Negative sense input | Matched impedance to +IN; differential pair rejects common-mode noise in noisy power rails. |
| GND (Pin 5) | Analog ground reference | Return path for internal bias networks and REF divider; must be connected to clean system ground plane. |
| REF (Pin 6) | Output reference level | Sets output common-mode voltage; open-circuit defaults to V+/2; externally driven to shift output range. |
| OUT (Pin 7) | Amplified output | Low-impedance (0.15Ω) buffered voltage proportional to sensed current direction/magnitude. |
| SHDN (Pin 8) | Shutdown control | Active-low logic input; <0.5V forces shutdown (<10µA); floating or >V+–0.5V enables operation via 2µA internal pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Outputs positive/negative voltage relative to REF to indicate current flow direction through shunt. |
| FMEA-optimized pinout option | Available in MSOP-FMEA variant (LT1999CS8-10F#PBF); SO-8 version uses standard pinout per datasheet Figure 1. |
| Smooth CM transition | No gain or offset discontinuity when VCM crosses V+ - eliminates measurement glitches in wide-dynamic-range systems. |
| AC CMRR >80dB @100kHz | Maintains accuracy in presence of high-frequency switching noise (e.g., MOSFET gate drive coupling). |
| AEC-Q100 qualified variants | LT1999HMS8-10F#WPBF available for automotive; SO-8 commercial grade LT1999CS8-10#PBF is not AEC-Q100 rated. |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Monitoring bidirectional armature current in brushed DC motor drivers with PWM commutation. IC Role / Device Role / Timing Role: High-side current sense amplifier providing real-time magnitude/direction feedback to MCU PWM controller. Use Value: Enables precise torque control and overcurrent protection using single shunt, eliminating need for dual-sense amplifiers or Hall sensors. | Use Scenario: Measuring energizing/de-energizing current in industrial solenoid valves operating from 24V–48V rails. IC Role / Device Role / Timing Role: Bidirectional analog front-end converting shunt voltage to MCU-readable signal with 2µs settling time. Use Value: Detects coil open-circuit (no current) and short-circuit (excess current) within 5µs, supporting predictive maintenance. |
| High Voltage Data Acquisition | PWM Control Loops |
Use Scenario: Isolated current measurement in telecom rectifiers or server PSU secondary-side monitoring (up to 80V common mode). IC Role / Device Role / Timing Role: Front-end signal conditioner feeding isolated ADC or digital isolator interface. Use Value: Eliminates need for expensive isolated amplifiers; 80V CMR allows direct connection to 48V bus without external level shifters. | Use Scenario: Real-time current feedback in synchronous buck converter with 500kHz–1MHz switching frequency. IC Role / Device Role / Timing Role: Fast-settling (2.5µs), low-noise (97nV/√Hz) current sense element in inner current loop. Use Value: Supports stable voltage-mode or peak-current-mode control with minimal phase lag, improving transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1DR | 20V/V gain, 80V CMR, 1.1MHz BW, 5V supply only; SO-8 package; lower offset (±20µV typ) but no REF pin flexibility. | Fixed gain and no REF pin limit output level-shifting; better for cost-sensitive, single-rail systems where mid-supply reference suffices. | Select INA240A1DR when ultra-low offset and higher CMRR (120dB) outweigh need for adjustable output common-mode. |
| MAX4080TASA+ | 10V/V gain, 76V CMR, 2.5MHz BW, 4.5V–76V supply; SO-8; includes internal 2.5V reference but no external REF pin. | Wider supply range enables direct 12V/24V operation; lacks REF pin adjustability but offers higher bandwidth and integrated reference. | Select MAX4080TASA+ when operating from unregulated 12V/24V rails and requiring faster response than LT1999CS8-10#PBF's 2MHz. |
Compared with INA240A1DR and MAX4080TASA+, the LT1999CS8-10#PBF uniquely supports user-defined output common-mode via REF pin, maintains smooth CM transition across V+, and delivers best-in-class 4kV HBM ESD robustness for factory-floor deployment.
Availability
LT1999CS8-10#PBF is available at Aetrix Electronics and suitable for industrial motor control, solenoid actuation, high-voltage data acquisition, and PWM power conversion requiring stable component supply across commercial temperature range.
Supply support for LT1999CS8-10#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, communications, automotive, and consumer markets.
The LT1999 family was designed specifically for high-accuracy, high-common-mode current sensing in harsh industrial and power electronics environments, emphasizing robustness, wide temperature operation, and seamless bidirectional measurement.
FAQ
What is the maximum common mode voltage supported by the LT1999CS8-10#PBF?
The LT1999CS8-10#PBF supports a continuous input common mode voltage range of –5V to 80V. This allows direct high-side sensing on 48V and 60V bus systems without external level-shifting circuitry. Absolute maximum ratings permit brief exposure to –5.25V to 88V, but sustained operation should remain within the specified –5V to 80V range to ensure guaranteed performance and reliability.
Does the LT1999CS8-10#PBF require external resistors for the REF pin?
No, the LT1999CS8-10#PBF includes internal 160kΩ/160kΩ resistive divider between V+ and GND, establishing a default REF voltage at V+/2 (2.5V at 5V supply). External resistors are optional and only needed if a different reference level is required - the REF pin accepts external voltages from 1.25V to V+–1.25V while maintaining ±3mV offset specification.
Can the LT1999CS8-10#PBF be used in automotive applications?
The LT1999CS8-10#PBF is a commercial-grade part rated for 0°C to 70°C and is not AEC-Q100 qualified. For automotive use, Analog Devices offers the LT1999HMS8-10F#WPBF (H-grade, –40°C to 125°C, FMEA-optimized MSOP, AEC-Q100 qualified). The LT1999CS8-10#PBF itself is intended for industrial and commercial power systems only.
What is the typical supply current of the LT1999CS8-10#PBF in active mode?
The LT1999CS8-10#PBF draws 1.55mA typical supply current at V+ = 5V and VCM > 5.5V. Current increases to 1.9mA maximum over temperature and supply variation. In shutdown mode (SHDN ≤ 0.5V), supply current drops below 10µA, making it suitable for low-power standby states in energy-conscious designs.
How does the LT1999CS8-10#PBF handle common mode transitions across the supply rail?
The LT1999CS8-10#PBF employs an internal diode bias network (D1) that activates when VCM falls below V+, ensuring continuous, glitch-free operation across the full –5V to 80V range. Unlike conventional amplifiers, it exhibits no gain step, offset shift, or recovery delay when crossing V+, enabling reliable current measurement in systems with rapidly varying bus voltages.
LT1999CS8-10#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SO
LT1999CS8-10#PBF FAQ
1.How can I place an order for LT1999CS8-10#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999CS8-10#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 LT1999CS8-10#PBF reliable?
The price and inventory of LT1999CS8-10#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999CS8-10#PBF is usually 5 days.
3.What payment methods are accepted for LT1999CS8-10#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999CS8-10#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999CS8-10#PBF?
LT1999CS8-10#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999CS8-10#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 LT1999CS8-10#PBF?
For technical support, including LT1999CS8-10#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999CS8-10#PBF requirements.
6.How does Aetrix verify that LT1999CS8-10#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999CS8-10#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 LT1999CS8-10#PBF meets industry standards.
7.What is the process for return or replacement of LT1999CS8-10#PBF?
All LT1999CS8-10#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999CS8-10#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 LT1999CS8-10#PBF part is unused and in its original packaging.
Return procedure for LT1999CS8-10#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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