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Analog Devices Inc. LT1999MPS8-50#PBF
- Part No.:
- LT1999MPS8-50#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1999MPS8-50#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,353
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Product details
Overview
LT1999MPS8-50#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 50V/V fixed gain, –5V to 80V input common mode range, 1.2MHz small-signal bandwidth, and ±0.5% gain accuracy. It operates from a 4.5V–5.5V supply, draws 1.55mA active current, and supports high-side or low-side shunt sensing in motor control, battery monitoring, and PWM power stages.
For engineers reviewing the LT1999MPS8-50#PBF datasheet, LT1999MPS8-50#PBF pinout, LT1999MPS8-50#PBF application, or LT1999MPS8-50#PBF equivalent, this device delivers precision bidirectional current measurement under harsh voltage transients, wide temperature operation (–55°C to 150°C), and FMEA-aware SO-8 packaging for automotive and industrial reliability-critical designs.
Technical Context
The LT1999MPS8-50#PBF uses matched on-chip resistor networks (R+IN/R–IN = 4kΩ each) and a transconductance stage to convert differential shunt voltage into a proportional output current, which is then converted to voltage by an internal transresistance amplifier with RG = 200kΩ. Its architecture ensures smooth, continuous operation across the full –5V to 80V common mode range without gain discontinuity or offset shift.
It features dual-mode REF pin operation: internally biased to mid-supply via 160kΩ/160kΩ divider or externally driven within 1.125V to (V+ – 1.125V); shutdown is controlled by SHDN pin with <10µA quiescent current and 1µs turn-on/off timing. Input protection includes 4kV HBM ESD tolerance and asymmetric clamps enabling safe operation at –5.25V to 88V common mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V fixed - enables ±20mV full-scale shunt voltage to produce ±1V output swing referenced to REF. |
| Common Mode Range | –5V to 80V - supports direct sensing in 48V/60V systems, high-side buck converters, and battery pack monitoring from depletion to full charge. |
| Bandwidth | 1.2MHz - sufficient for accurate current capture in 500kHz PWM switching power supplies and fast solenoid actuation loops. |
| Input Offset Voltage | ±500µV max - limits worst-case error to ±10mV at full-scale output, critical for low-current precision in battery fuel gauging. |
| Supply Current | 1.55mA typical at VCM > 5.5V - enables low-power operation in always-on monitoring circuits without thermal derating. |
| Operating Temperature | –55°C to 150°C - qualified for under-hood automotive, industrial motor drives, and aerospace-grade embedded systems. |
| Shutdown Current | <10µA - allows system-level power gating during sleep modes while retaining fast wake-up capability. |
Pinout & Package
LT1999MPS8-50#PBF is housed in an 8-lead plastic SO (narrow) package (S8), RoHS-compliant, with lead-free finish and moisture sensitivity level 1. Pinout follows standard SO-8 configuration optimized for layout robustness and thermal performance (θJA = 190°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 4) | Power supply input | Internally tied pins accepting 4.5V–5.5V; dual connection reduces IR drop and improves PSRR in noisy environments. |
| +IN (Pin 2) | Positive sense input | Differential input connected to high-side of shunt; protected by ESD clamp enabling –5.25V to 88V safe common mode operation. |
| –IN (Pin 3) | Negative sense input | Differential input connected to low-side of shunt; matched impedance (4kΩ) with +IN ensures stable CMRR >96dB over full temperature range. |
| GND (Pin 5) | Analog ground reference | Return path for internal bias currents and REF divider; must be star-connected to minimize ground bounce in high-dI/dt applications. |
| REF (Pin 6) | Output common-mode reference | Sets output midpoint; can be left floating (defaults to V+/2) or driven externally to shift output range for ADC interfacing or level translation. |
| OUT (Pin 7) | Amplified output | Low-impedance (0.15Ω) rail-to-rail capable output driving ≥200pF directly; sourcing/sinking up to 40mA supports direct interface to comparators or microcontroller ADCs. |
| SHDN (Pin 8) | Active-low shutdown control | Pulled low ≤0.5V to enter sub-10µA shutdown; internal 2µA pull-up ensures default active state if left unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Outputs positive/negative voltage relative to REF to indicate current direction-enables regenerative braking detection in H-bridge motor controllers. |
| FMEA-optimized SO-8 package | Pinout and layout compatibility verified for failure mode avoidance in safety-critical automotive systems per ISO 26262 requirements. |
| High common-mode transient immunity | 0.8µs recovery time after ±50V, 20ns CM step-maintains signal integrity during IGBT/MOSFET switching edge-induced noise. |
| AEC-Q100 qualified | MP-grade qualification (–55°C to 150°C) with lifetime validation beyond 1000 hours at 150°C-meets automotive Grade 0 reliability standards. |
| Wide supply rejection | 77dB PSRR at DC-rejects ripple and noise on 5V rail from switching regulators, preserving measurement accuracy in shared power domains. |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Real-time phase current monitoring in 48V electric power steering (EPS) systems with bidirectional torque control. IC Role / Device Role / Timing Role: High-side and low-side shunt amplifier providing isolated, rail-referenced current feedback to PWM controller with <2.5µs settling time. Use Value: Enables precise field-oriented control (FOC) and overcurrent protection at 20kHz switching frequency without gain discontinuity across 0A crossing. | Use Scenario: Closed-loop current regulation in industrial pneumatic valve actuators powered from 24V/48V supplies. IC Role / Device Role / Timing Role: Low-latency current monitor feeding analog input of PLC I/O module with 1.2MHz bandwidth supporting fast solenoid response. Use Value: Eliminates need for external op-amp conditioning; ±0.5% gain accuracy ensures repeatable force calibration across –40°C to 125°C ambient. |
| Battery Charge/Discharge Monitoring | PWM Power Supply Feedback |
Use Scenario: Coulomb counting and state-of-charge estimation in lithium-ion battery packs used in energy storage systems (ESS). IC Role / Device Role / Timing Role: Bidirectional shunt amplifier measuring charge/discharge current with REF pin tied to microcontroller's internal VREF for ratiometric ADC conversion. Use Value: ±500µV offset enables sub-10mA resolution at 100mΩ shunt, improving SoC accuracy to ±1.5% over full temperature range. | Use Scenario: Output current sensing in isolated DC-DC converters for telecom rectifiers operating at 300kHz–1MHz switching frequencies. IC Role / Device Role / Timing Role: Fast-response current sense element in average-current-mode control loop, interfaced to error amplifier via filtered OUT signal. Use Value: 1.2MHz bandwidth captures peak current harmonics without phase lag, improving load transient response and stability margin. |
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 | 50V/V gain, –4V to 80V CM range, 4.5V–5.5V supply, but only –40°C to 125°C rating and no FMEA-optimized SO-8 pinout. | Automotive AEC-Q100 Grade 1 (not Grade 0); lacks MP-grade extended temperature support for under-hood deployment. | Select when cost-sensitive automotive Tier 2 applications require AEC-Q100 compliance but do not demand –55°C startup or 150°C continuous operation. |
| MAX40056ASA+ | 50V/V gain, –5V to 65V CM range, 3.3V/5V supply, 1.5MHz bandwidth, but only 8-lead SOIC package with standard pinout (no FMEA variant). | Lower common mode ceiling limits use in 72V industrial systems; no MP-grade qualification or 4kV HBM rating. | Select for 3.3V-system integration where supply voltage flexibility outweighs extended temperature and ruggedness requirements. |
Compared with INA240A1QDRQ1 and MAX40056ASA+, the LT1999MPS8-50#PBF uniquely combines MP-grade temperature range (–55°C to 150°C), FMEA-optimized SO-8 pinout, 4kV HBM tolerance, and seamless –5V to 80V common mode operation-making it the only option qualified for safety-critical, high-reliability automotive and industrial power systems requiring guaranteed performance at extreme junction temperatures.
Availability
LT1999MPS8-50#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, battery management systems, industrial solenoid drivers, and high-voltage DC-DC converter feedback loops requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT1999MPS8-50#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1999 family was designed specifically for high-voltage, high-accuracy bidirectional current sensing in demanding power electronics applications-including automotive electrification, industrial automation, and renewable energy systems-where reliability, precision, and wide operating margins are non-negotiable.
FAQ
What is the maximum common mode voltage the LT1999MPS8-50#PBF can handle?
The LT1999MPS8-50#PBF supports a continuous input common mode voltage range of –5V to 80V. Its ESD protection clamps allow safe operation up to –5.25V and 88V under transient conditions without damage or latch-up, making it suitable for 48V/60V bus monitoring and high-side switch applications.
Does the LT1999MPS8-50#PBF require external resistors to set gain?
No, the LT1999MPS8-50#PBF has a factory-trimmed fixed gain of 50V/V. Gain is set by internal laser-trimmed thin-film resistors (RG = 200kΩ, RIN = 4kΩ), eliminating external components and ensuring ±0.5% gain accuracy over temperature without calibration.
Can the LT1999MPS8-50#PBF operate from a 3.3V supply?
No-the LT1999MPS8-50#PBF requires a minimum supply voltage of 4.5V and is specified only for 4.5V to 5.5V operation. Attempting 3.3V operation results in undefined behavior, degraded CMRR, and potential output saturation; it is not characterized or guaranteed below 4.5V.
How does the REF pin function in the LT1999MPS8-50#PBF?
The REF pin sets the output common-mode voltage. When left floating, it defaults to V+/2 via internal 160kΩ/160kΩ divider. It can be driven externally between 1.125V and (V+ – 1.125V) to shift output range-for example, aligning with a 2.5V ADC reference or enabling single-supply operation with rail-to-rail inputs.
Is the LT1999MPS8-50#PBF pin-compatible with other LT1999 variants?
Yes-LT1999MPS8-50#PBF shares identical SO-8 pinout and footprint with all LT1999-x variants (e.g., LT1999MPS8-10#PBF, LT1999MPS8-20#PBF). Only the gain-setting resistor network differs internally; no PCB changes are required when upgrading or downgrading gain in existing designs.
LT1999MPS8-50#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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1999MPS8-50#PBF FAQ
1.How can I place an order for LT1999MPS8-50#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999MPS8-50#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 LT1999MPS8-50#PBF reliable?
The price and inventory of LT1999MPS8-50#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999MPS8-50#PBF is usually 5 days.
3.What payment methods are accepted for LT1999MPS8-50#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999MPS8-50#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999MPS8-50#PBF?
LT1999MPS8-50#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999MPS8-50#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 LT1999MPS8-50#PBF?
For technical support, including LT1999MPS8-50#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999MPS8-50#PBF requirements.
6.How does Aetrix verify that LT1999MPS8-50#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999MPS8-50#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 LT1999MPS8-50#PBF meets industry standards.
7.What is the process for return or replacement of LT1999MPS8-50#PBF?
All LT1999MPS8-50#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999MPS8-50#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 LT1999MPS8-50#PBF part is unused and in its original packaging.
Return procedure for LT1999MPS8-50#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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