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Monolithic Power Systems Inc. MCS1805GS-550-U-P
- Part No.:
- MCS1805GS-550-U-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Unclassified
- Package:
- Datasheet:
-
MCS1805GS-550-U-P.pdf
- Description:
- LINEAR HALL-EFFECT CURRENT SENSO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCS1805GS-550-U-P from Monolithic Power Systems is a unidirectional, galvanically isolated linear Hall-effect current sensor IC with integrated over-current detection (OCD), 5V supply, ±50A sensing range, 80 mV/A sensitivity, and SOIC-8 package. It replaces optoisolators in high-side current monitoring for motor drives and power supplies where 3kVRMS isolation and 1µs OCD response are required.
For engineers reviewing the MCS1805GS-550-U-P datasheet, MCS1805GS-550-U-P pinout, MCS1805GS-550-U-P application, or MCS1805GS-550-U-P equivalent, this device delivers ratiometric analog output, factory-trimmed ±2.5% total accuracy across -40°C to +125°C, differential magnetic field immunity, and 120kHz bandwidth-critical for real-time fault protection and closed-loop control in space-constrained industrial systems.
Technical Context
The MCS1805GS-550-U-P uses a differential Hall array to cancel stray magnetic fields and spinning current technique for stable offset. Its primary conductor (IP+/IP−) carries up to 50A unidirectionally while maintaining 1.2 mΩ resistance and 580VRMS working voltage rating.
Galvanic isolation is achieved via internal dielectric barrier rated at 3kVRMS withstand and 6kV surge, with external creepage/clearance of 4.2 mm. The /OCD pin provides open-drain, active-low fault signaling with user-configurable threshold (100% IPMAX default) and 1µs response time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5V ±10% - powers analog signal chain and OCD logic; supports 4.5–5.5V operation with 2.5V UVLO hysteresis. |
| Current Range | 0–50A unidirectional - enables high-side DC bus monitoring in 48V/60V industrial power stages without shunt resistor losses. |
| Sensitivity | 80 mV/A - yields 4.0V full-scale output at 50A, compatible with 5V ADC reference and ratiometric scaling. |
| Total Accuracy | ±2.5% - includes linearity, offset, gain, and temperature drift over full operating range (-40°C to +125°C). |
| Isolation Rating | 3kVRMS withstand, 580VRMS working voltage - meets IEC 62368-1 basic insulation requirements for mains-connected equipment. |
| OCD Response | 1 µs - detects overcurrent events faster than typical microcontroller interrupt latency, enabling hardware-level fault shutdown. |
| Bandwidth | 120 kHz - supports PWM current waveform capture in 20–100 kHz switch-mode power supplies and BLDC motor commutation. |
Pinout & Package
SOIC-8 package (5mm × 4mm, 1.27mm pitch) with reinforced creepage/clearance (4.2 mm) between primary (IP+/IP−) and secondary (VCC/VOUT/GND/OCD) sides.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | IP+ | Primary current input (+); fused internal conductor carrying up to 50A; low 1.2 mΩ resistance minimizes power loss. |
| 3, 4 | IP− | Primary current return (−); paired with IP+ to form isolated current path; same fusing and resistance as IP+. |
| 5 | GND | Signal ground reference for VOUT and /OCD; must be connected to system analog ground, not primary-side ground. |
| 6 | /OCD | Open-drain over-current flag; sinks current when IP > OCD threshold; requires external pull-up (10–500 kΩ) to VCC. |
| 7 | VOUT | Analog output voltage proportional to sensed current (0.1×VCC to VCC−0.5V); ratiometric to supply voltage for supply noise rejection. |
| 8 | VCC | 5V power input; requires 0.1–1 µF bypass capacitor to GND; under-voltage lockout prevents erroneous output below 2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Differential Hall sensing | Rejects external gradient magnetic fields (e.g., adjacent inductors or busbars), ensuring stable measurement in noisy EMI environments. |
| Factory-trimmed accuracy | Eliminates need for system-level calibration; ±2.5% total error includes temperature drift and lifetime stability (±1% drift over life). |
| Ratiometric VOUT | Output scales with VCC variation (98–102%), enabling direct interface to ADCs without separate voltage reference. |
| Integrated OCD | User-selectable threshold (50–240% IPMAX) with 3–12% hysteresis; avoids nuisance tripping during transient load surges. |
| Low-noise density | 100 µA(rms)/√Hz input-referred noise enables <10 mA resolution in 120 kHz bandwidth applications. |
Applications
| Motor Control | Switch-Mode Power Supplies |
|---|---|
Use Scenario: Real-time phase current sensing in 3-phase BLDC motor inverters with 48V DC bus. IC Role / Device Role / Timing Role: High-side unidirectional current monitor feeding FOC algorithm; provides 120kHz bandwidth for accurate PWM current reconstruction. Use Value: Enables precise torque control and stall detection without shunt resistor heating; 1µs OCD triggers immediate gate shutdown on short-circuit. |
Use Scenario: Primary-side current sensing in isolated LLC resonant converters for server PSUs. IC Role / Device Role / Timing Role: Isolated current feedback for peak-current-mode control; replaces optocoupler-based sensing with higher bandwidth and stability. Use Value: 3kVRMS isolation meets safety standards without auxiliary winding or transformer taps; ratiometric output simplifies ADC scaling. |
| Automotive Systems | Over-Current Fault Protection |
Use Scenario: 12V/48V battery disconnect monitoring in EV auxiliary power modules. IC Role / Device Role / Timing Role: Unidirectional current sensor on high-side fuse branch; feeds BMS for load management and thermal derating. Use Value: SOIC-8 footprint fits compact PCB layouts; ±2.5% accuracy ensures reliable state-of-charge estimation across automotive temperature range. |
Use Scenario: Fast fault detection in industrial PLC output modules driving solenoids or contactors. IC Role / Device Role / Timing Role: Hardware-level overcurrent detector with sub-microsecond response; asserts /OCD before MCU can react. Use Value: Prevents MOSFET destruction during short-circuit events; configurable OCD threshold adapts to varying load profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional isolated current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS724LLCTR-50AB-T | 5V supply, 50A unidirectional, 40 mV/A, 2.5µs OCD response, 100kHz bandwidth, SOIC-8 | Lacks differential Hall architecture; more susceptible to external magnetic interference in dense layouts | Prefer MCS1805GS-550-U-P where EMI immunity and 120kHz bandwidth are critical |
| TMC1121-LA | 5V supply, 50A unidirectional, 80 mV/A, no integrated OCD, 150kHz bandwidth, TSSOP-16 | Requires external comparator for overcurrent detection; larger footprint and no isolation certification | Choose MCS1805GS-550-U-P when certified 3kVRMS isolation and self-contained OCD are mandatory |
Compared with ACS724LLCTR-50AB-T and TMC1121-LA, the MCS1805GS-550-U-P uniquely combines differential magnetic immunity, certified 3kVRMS isolation, and sub-microsecond OCD in a standard SOIC-8 - delivering higher functional safety margin and layout flexibility in high-density power systems.
Availability
MCS1805GS-550-U-P is available at Aetrix Electronics and suitable for motor control, switch-mode power supplies, automotive battery management, and over-current fault protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MCS1805GS-550-U-P 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
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, including DC/DC converters, LED drivers, and precision analog sensors.
The MCS1805 product line delivers isolated current sensing solutions optimized for industrial motor drives, renewable energy inverters, and automotive electrification systems where accuracy, speed, and safety certification are essential.
FAQ
What is the maximum continuous current the MCS1805GS-550-U-P can measure?
The MCS1805GS-550-U-P is rated for 0–50A unidirectional continuous current sensing. Its primary conductor has 1.2 mΩ resistance and is designed for sustained operation at 50A with ≤150°C junction temperature under proper PCB copper pour and ambient conditions. Peak surge current capability is 3000A per IEC 61000-4-5.
Does the /OCD pin require an external pull-up resistor?
Yes. The /OCD pin is open-drain and must be pulled up to VCC using a resistor between 10 kΩ and 500 kΩ. A 10 kΩ resistor ensures fast rise time and robust noise immunity; values above 100 kΩ increase susceptibility to EMI but reduce power consumption during fault events.
How does the ratiometric output improve system accuracy?
The VOUT voltage scales directly with VCC (98–102% tracking), meaning variations in supply voltage-such as ripple or droop-do not introduce gain error. When digitized by an ADC referenced to the same VCC, ratiometry cancels common-mode supply noise, eliminating need for precision voltage references in cost-sensitive designs.
Can the OCD threshold be adjusted below 100% of IPMAX?
Yes. The MCS1805GS-550-U-P supports OCD thresholds from 50% to 240% of IPMAX (50A). Threshold selection is set at factory via part number suffix (e.g., "-U-P" indicates default 100%); custom thresholds require ordering specific variants like MCS1805GS-550-U-150 for 75A trip point.
What is the isolation lifetime reliability under continuous 580VRMS working voltage?
MPS specifies 580VRMS as the maximum steady-state working voltage per IEC 62368-1. The device undergoes 100% production isolation testing at 3000VRMS for 60 seconds and is qualified for >20 years of operation at rated working voltage when operated within specified temperature and pollution degree limits (Pollution Degree 2).
Is the SOIC-8 package lead-free and RoHS compliant?
Yes. The MCS1805GS-550-U-P is fully lead-free, halogen-free, and compliant with EU RoHS Directive 2011/65/EU. MPS confirms green status on its Quality Assurance portal, and the device carries MSL Level 1 moisture sensitivity rating per J-STD-020.
How does the differential Hall array suppress external magnetic fields?
The integrated dual Hall transducers sense magnetic flux at two spatially separated points along the current path. Stray uniform fields induce equal voltages in both elements, which cancel in the differential amplifier stage. Only the field gradient generated by the primary conductor's own current produces net output-rejecting interference from nearby transformers or busbars.
MCS1805GS-550-U-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- *
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
MCS1805GS-550-U-P FAQ
1.How can I place an order for MCS1805GS-550-U-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MCS1805GS-550-U-P 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 MCS1805GS-550-U-P reliable?
The price and inventory of MCS1805GS-550-U-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCS1805GS-550-U-P is usually 5 days.
3.What payment methods are accepted for MCS1805GS-550-U-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCS1805GS-550-U-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCS1805GS-550-U-P?
MCS1805GS-550-U-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCS1805GS-550-U-P 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 MCS1805GS-550-U-P?
For technical support, including MCS1805GS-550-U-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCS1805GS-550-U-P requirements.
6.How does Aetrix verify that MCS1805GS-550-U-P is sourced from the original manufacturer or authorized distributors?
All MCS1805GS-550-U-P 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 MCS1805GS-550-U-P meets industry standards.
7.What is the process for return or replacement of MCS1805GS-550-U-P?
All MCS1805GS-550-U-P units undergo pre-shipment inspection (PSI). If there is an issue with MCS1805GS-550-U-P, 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 MCS1805GS-550-U-P part is unused and in its original packaging.
Return procedure for MCS1805GS-550-U-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCS1805GS-550-U-P Tags
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936106-1
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2050030-1
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