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Analog Devices Inc. LT1999CS8-50#PBF
- Part No.:
- LT1999CS8-50#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1999CS8-50#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:188
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Product details
Overview
LT1999CS8-50#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with fixed 50V/V gain, –5V to 80V input common mode range, 1.2MHz small-signal bandwidth, ±0.5% gain accuracy, and 8-lead SO package. It senses shunt voltage to generate polarity-aware output referenced to mid-supply or external REF, enabling precise H-bridge motor current monitoring.
For engineers reviewing the LT1999CS8-50#PBF datasheet, LT1999CS8-50#PBF pinout, LT1999CS8-50#PBF application, or LT1999CS8-50#PBF equivalent, this page delivers verified specifications, FMEA-compatible SO package details, automotive-grade temperature support (0°C to 70°C), and real-world use cases in PWM control loops and battery charge/discharge monitoring.
Technical Context
The LT1999CS8-50#PBF employs a transconductance-based sensing architecture with matched on-chip 4kΩ input resistors and a 200kΩ internal gain-setting resistor (RG), delivering exact 50V/V gain. Its dual-path biasing-via internal 160kΩ divider for VCM > V+ and integrated diode D1 for VCM < V+-ensures smooth, continuous operation across the full –5V to 80V common mode range without gain or offset discontinuity.
It features an active REF pin that sets output common-mode level, supports external reference override within 1.125V to (V+ – 1.125V), and provides 62dB REF rejection. Shutdown mode reduces supply current to <10µA while maintaining 1µs turn-on/turn-off timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V fixed - enables direct conversion of ±20mV shunt voltage to ±1V 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 | 1.2MHz - captures fast current transients in PWM switching power supplies operating up to 200kHz. |
| Gain Accuracy | ±0.5% max - ensures ≤10mV error at ±1V full-scale output, critical for closed-loop motor torque control. |
| Input Offset Voltage | ±1.5mV max - contributes ≤75µV error referred to input, preserving resolution for sub-amp current measurement. |
| Supply Current | 1.55mA typical at VCM > 5.5V - enables low-power operation in always-on battery monitoring circuits. |
| Shutdown Current | <10µA - allows system-level power gating during idle states without compromising wake-up latency. |
Pinout & Package
LT1999CS8-50#PBF uses an 8-lead plastic SO (narrow) package (S8), JEDEC MS-012AC compliant, with 1.27mm lead pitch and 5.0mm × 6.2mm body size. Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 4) | Power supply input | Internally tied pins accept 4.5V–5.5V; supports single 5V rail; lower voltages possible but uncharacterized. |
| +IN (Pin 2) | Positive sense input | Connects to high-side of shunt; differential pair input with 6.4–9.6kΩ impedance matching –IN. |
| –IN (Pin 3) | Negative sense input | Connects to low-side of shunt; matched to +IN for CMRR >96dB over full common mode range. |
| GND (Pin 5) | Analog ground reference | Return path for REF divider and internal bias; must be star-connected to minimize noise coupling. |
| REF (Pin 6) | Output common-mode reference | Defaults to V+/2 via internal 160kΩ dividers; externally overdrivable to set custom output center point. |
| OUT (Pin 7) | Amplified output | Low-impedance (0.15Ω) rail-to-rail capable output; drives ≥200pF directly; requires series R for larger capacitive loads. |
| SHDN (Pin 8) | Active-low shutdown control | Pulled to GND ≤0.5V to enter shutdown; floating or pulled high enables operation via internal 2µA pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Output polarity indicates current direction - essential for regenerative braking and battery charge/discharge state detection. |
| FMEA-optimized pinout option | Available in dedicated MSOP-FMEA variant (LT1999CS8-50F#PBF); SO version uses standard pinout but shares same functional reliability. |
| High common-mode step recovery | 1.3µs recovery from ±50V CM step - maintains signal integrity during fast-switching inverter transitions. |
| AEC-Q100 qualified | Rated for automotive applications (H-grade variants); C-grade LT1999CS8-50#PBF meets 0°C to 70°C ambient requirements with proven reliability. |
| ESD robustness | 4kV HBM / 1kV CDM tolerance - withstands handling and board-level ESD events without latch-up or parameter shift. |
Applications
| Motor Control Feedback | Battery Management System |
|---|---|
Use Scenario: Real-time armature current monitoring in 24V/48V brushed DC or BLDC motor drivers with H-bridge topology. IC Role / Device Role / Timing Role: High-side or low-side bidirectional current amplifier feeding analog input of MCU ADC or dedicated motor controller. Use Value: Enables precise torque control and overcurrent protection with 1.2MHz bandwidth capturing PWM ripple without aliasing. | Use Scenario: Monitoring charge/discharge current in lithium-ion battery packs during charging cycles and load dumps. IC Role / Device Role / Timing Role: Shunt-based current transducer converting mV-level sense voltage to clean, referenced ±1V output for fuel gauge IC or microcontroller. Use Value: ±0.5% gain accuracy and ±1.5mV offset ensure ≤1% total current measurement error across –20°C to 70°C ambient. |
| Industrial Power Supply | Automotive Solenoid Driver |
Use Scenario: Output current sensing in isolated DC-DC converters and programmable lab power supplies with wide output voltage ranges. IC Role / Device Role / Timing Role: High-common-mode current monitor placed on primary or secondary side to feed feedback loop or safety circuitry. Use Value: –5V to 80V CM range supports sensing on either side of isolation barrier; 1.2MHz bandwidth enables dynamic load transient response analysis. | Use Scenario: Closed-loop current regulation in 12V/24V automotive solenoid actuators (e.g., transmission shift solenoids, fuel injectors). IC Role / Device Role / Timing Role: Bidirectional amplifier detecting coil energization and flyback current decay phase for precise dwell time control. Use Value: Fast 1.3µs common-mode recovery prevents false triggering during inductive kickback; AEC-Q100-compliant reliability ensures field longevity. |
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 | 50V/V gain, –4V to 80V CM range, 1.1MHz bandwidth, 10ppm/°C gain drift vs. LT1999's 5μV/°C offset drift | Requires external REF decoupling; no internal mid-supply divider - adds BOM cost and layout complexity | Preferred for ultra-low drift systems where offset stability dominates over REF convenience |
| MAX4080TASA+ | 50V/V gain, –5V to 76V CM range, 250kHz bandwidth, 1.5µV/°C offset drift, SO-8 package | Lower bandwidth limits use in >100kHz PWM systems; lacks SHDN pin - no low-power sleep mode | Selected when cost sensitivity outweighs bandwidth needs and shutdown functionality is unnecessary |
Compared with INA240A1DR and MAX4080TASA+, the LT1999CS8-50#PBF uniquely integrates a factory-trimmed mid-supply REF divider, 1.2MHz bandwidth for high-frequency switching, and sub-10µA shutdown - making it optimal for space-constrained, battery-aware motor and power systems requiring zero-additional-component operation.
Availability
LT1999CS8-50#PBF is available at Aetrix Electronics and suitable for industrial motor control, automotive solenoid monitoring, and battery management systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1999CS8-50#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LT1999 product line delivers high-voltage, high-bandwidth current sensing for demanding real-time control applications - engineered specifically for H-bridge motor drives, switching power supplies, and battery systems where accuracy, speed, and reliability are non-negotiable.
FAQ
What is the maximum common mode voltage the LT1999CS8-50#PBF can handle?
The LT1999CS8-50#PBF supports an input common mode voltage range of –5V to 80V. This allows safe operation in high-side configurations of 48V industrial systems and negative-rail sensing in specialized power architectures. Absolute maximum ratings extend to –5.25V and 88V for short-duration transients, but sustained operation should remain within the specified range to ensure guaranteed performance and reliability.
Does the LT1999CS8-50#PBF require external resistors to set gain?
No, the LT1999CS8-50#PBF has a fixed 50V/V gain implemented using laser-trimmed on-chip resistors - no external components are needed. The internal RG resistor is nominally 200kΩ, paired with 4kΩ input resistors to achieve exact 50× amplification. This eliminates gain-setting errors and PCB area associated with discrete resistor networks.
Can the LT1999CS8-50#PBF operate from a 3.3V supply?
No - the LT1999CS8-50#PBF is specified for 4.5V to 5.5V operation. While functional behavior may occur down to ~4V, Analog Devices does not characterize, guarantee, or recommend operation below 4.5V. Using 3.3V violates the absolute maximum rating for total supply voltage and risks degraded CMRR, bandwidth, output swing, and thermal instability.
How does the REF pin function in the LT1999CS8-50#PBF?
The REF pin in the LT1999CS8-50#PBF sets the output common-mode voltage. Internally biased to V+/2 by matched 160kΩ resistors, it defaults to 2.5V with a 5V supply. It can be overdriven by an external source within 1.125V to (V+ – 1.125V) to shift the output baseline - enabling compatibility with ADC reference voltages other than mid-supply, such as 1.25V or 3.3V systems.
Is the LT1999CS8-50#PBF pin-compatible with other gain versions like LT1999CS8-10#PBF?
Yes - all LT1999 SO-8 variants (LT1999CS8-10#PBF, LT1999CS8-20#PBF, LT1999CS8-50#PBF) share identical pinout, package, and footprint. Only the internal gain-setting resistor differs. This allows design reuse across current-sensing ranges: ±350mV full-scale for -10, ±200mV for -20, and ±80mV for -50 - simplifying schematic and layout revisions.
LT1999CS8-50#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:
- 1.2 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
LT1999CS8-50#PBF FAQ
1.How can I place an order for LT1999CS8-50#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999CS8-50#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 LT1999CS8-50#PBF reliable?
The price and inventory of LT1999CS8-50#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999CS8-50#PBF is usually 5 days.
3.What payment methods are accepted for LT1999CS8-50#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999CS8-50#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999CS8-50#PBF?
LT1999CS8-50#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999CS8-50#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 LT1999CS8-50#PBF?
For technical support, including LT1999CS8-50#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999CS8-50#PBF requirements.
6.How does Aetrix verify that LT1999CS8-50#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999CS8-50#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 LT1999CS8-50#PBF meets industry standards.
7.What is the process for return or replacement of LT1999CS8-50#PBF?
All LT1999CS8-50#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999CS8-50#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 LT1999CS8-50#PBF part is unused and in its original packaging.
Return procedure for LT1999CS8-50#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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