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Analog Devices Inc./Maxim Integrated MAX9919FASA+
- Part No.:
- MAX9919FASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MAX9919FASA+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,172
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Product details
Overview
The MAX9919FASA+ from Maxim Integrated is a fixed-gain, high-accuracy current-sense amplifier optimized for automotive and industrial inductive load monitoring. It features a -20V to +75V input common-mode range, 45V/V fixed gain, ±50mV full-scale sense voltage, and operates from a single 4.5V–5.5V supply across -40°C to +125°C - enabling precise H-bridge motor or solenoid current sensing under reverse-battery or inductive-kickback conditions.
For engineers reviewing the MAX9919FASA+ datasheet, MAX9919FASA+ pinout, MAX9919FASA+ application, or MAX9919FASA+ equivalent, this device delivers rail-to-rail output, 250kHz small-signal bandwidth, 0.45% max gain error over temperature, 400µV max input offset voltage, and AEC-Q100 qualification - critical for robust bidirectional current measurement in safety-critical embedded systems.
Technical Context
The MAX9919FASA+ employs dual-level-shifting input architecture to support operation from -20V to +75V common-mode voltage while maintaining precision. Its laser-trimmed internal resistors fix gain at 45V/V, eliminating external gain-setting components and reducing layout sensitivity.
It supports both unidirectional (REFIN = GND) and bidirectional (REFIN = VCC/2) operation with rail-to-rail output swing, and integrates active shutdown (SHDN) with <10µA quiescent current. Input bias current remains stable across the full common-mode range, ensuring accuracy during transient events like inductive kickback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 45V/V - eliminates external resistor network, reduces BOM count and layout sensitivity. |
| Input Common-Mode Range | -20V to +75V - enables direct sensing on high-side, low-side, or floating nodes in 12V/24V automotive systems, including reverse-battery and inductive-kickback scenarios. |
| Full-Scale Sense Voltage | ±50mV - matches standard high-precision shunt resistors (e.g., 5–50mΩ), minimizing I²R loss while preserving resolution. |
| Gain Error (max) | ±1.2% over -40°C to +125°C - ensures consistent current-to-voltage scaling across automotive thermal extremes without calibration. |
| Small-Signal Bandwidth | 250kHz - supports accurate sensing of fast-switching motor currents (e.g., PWM-driven BLDC phases) with minimal phase lag. |
| Input Offset Voltage (max) | 400µV - contributes ≤0.8% error at 50mV full-scale, enabling sub-1% total unadjusted current measurement accuracy. |
| Supply Voltage Range | 4.5V to 5.5V - compatible with standard 5V automotive rails and LDO outputs, with 74dB PSRR rejecting supply noise. |
Pinout & Package
Package: 8-pin SOIC with exposed pad (SO-EP), RoHS-compliant, thermally enhanced for automotive ambient operation up to +125°C. Exposed pad must be connected to solid ground for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Positive current-sense input | Connects to power side of shunt; withstands -30V to +80V vs. GND (VCC = 5V) - supports high-side sensing with negative transients. |
| 2 RS- | Negative current-sense input | Connects to load side of shunt; differential input accepts ±15V (MAX9919F), enabling wide dynamic range without clipping. |
| 3 SHDN | Active-high shutdown control | Pull high (>2.0V) to reduce supply current to ≤10µA; essential for low-power sleep modes in battery-powered ECUs. |
| 4 GND | Analog/digital ground reference | Primary ground return; exposed pad must be tied to same low-impedance ground plane to minimize offset drift and thermal resistance (θJC = 7°C/W). |
| 5 OUT | Current-sense amplifier output | Rail-to-rail output drives ADC inputs directly; 0.1Ω output impedance ensures stability into 10kΩ+ loads (e.g., SAR ADC sample capacitors). |
| 6 FB | Feedback input | Left unconnected for MAX9919F - internal fixed-gain path bypasses external divider; incorrect connection degrades accuracy. |
| 7 REFIN | Bidirectional reference input | Set to GND for unidirectional mode (0–5V output); set to VCC/2 (2.5V) for bidirectional mode (±2.5V output swing relative to REFIN). |
| 8 VCC | Positive supply input | Requires 0.1µF ceramic bypass capacitor to GND; supports 4.5–5.5V operation with 1.2mA typical supply current at +25°C. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive Grade 1 (-40°C to +125°C), with production-tested reliability and failure-rate data supporting safety-critical applications. |
| Dual-level-shifting input stage | Enables seamless transition between negative (-20V) and high-positive (+75V) common-mode voltages without saturation or recovery delay. |
| Rail-to-rail output | Delivers full 0–5V (unidirectional) or ±2.5V (bidirectional) output swing, maximizing ADC utilization and minimizing quantization error. |
| 250kHz small-signal bandwidth | Supports accurate current capture in 20kHz PWM motor drives with <3.5µs 1% settling time - critical for real-time torque control loops. |
| Low input offset drift | ±1.8µV/°C (at VCM = +14V) - limits temperature-induced gain error drift to <0.22% over full automotive range. |
| High CMRR (96dB) | Maintains accuracy despite large common-mode transients (e.g., 12V battery ripple), reducing need for additional filtering stages. |
Applications
| H-Bridge Motor Current Sensing | Solenoid Current Sensing |
|---|---|
Use Scenario: Real-time phase current monitoring in BLDC or stepper motor drivers with PWM switching up to 20kHz. IC Role / Device Role / Timing Role: High-side/low-side current-sense amplifier providing isolated analog feedback to MCU ADC with <3.5µs settling. Use Value: Enables closed-loop torque control and overcurrent protection without adding isolation amplifiers or increasing PCB area. |
Use Scenario: Monitoring energizing/de-energizing current in automotive fuel injectors or transmission solenoids. IC Role / Device Role / Timing Role: Bidirectional current sensor referenced to VCC/2, capturing both pull-in and release transients. Use Value: Detects coil degradation or open-circuit faults by analyzing current slew rate and peak amplitude within 5µs of activation. |
| Automotive Battery Management | Industrial Inductive Load Monitoring |
Use Scenario: Charge/discharge current sensing in 12V starter-battery or 48V mild-hybrid systems with reverse-polarity protection. IC Role / Device Role / Timing Role: Unidirectional amplifier (REFIN = GND) measuring bidirectional current flow via separate high/low-side channels. Use Value: Supports ISO 16750-2 pulse testing with -20V tolerance, eliminating need for external clamping diodes and reducing component count. |
Use Scenario: Monitoring current in industrial PLC output modules driving 24V solenoids, relays, or valve actuators. IC Role / Device Role / Timing Role: High-common-mode amplifier interfacing directly to field-side shunts in noisy factory environments. Use Value: 96dB CMRR rejects 50/60Hz magnetic interference and switching noise, improving measurement SNR by >15dB vs. standard op-amps. |
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 | Fixed 20V/V gain, wider supply range (2.7–5.5V), lower bandwidth (400kHz), higher offset (±25µV typ). | Optimized for lower-gain, higher-current shunts (e.g., 1–10mΩ); less suitable for ±50mV full-scale designs requiring 45V/V scaling. | Select when system uses low-value shunts and requires higher supply flexibility; verify REFIN interface compatibility for bidirectional mode. |
| MAX40056ATA+T | Fixed 50V/V gain, identical package, but only specified to +105°C (not AEC-Q100), 120kHz bandwidth, ±1.5% gain error. | Targeted at industrial/commercial motor drives; lacks automotive qualification and thermal margin for under-hood deployment. | Consider for cost-sensitive non-automotive applications where AEC-Q100 and +125°C operation are not required. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the MAX9919FASA+ provides superior gain accuracy (±1.2% vs. ±1.5%), guaranteed automotive temperature range, and higher bandwidth per gain setting - making it the preferred choice for safety-critical, high-fidelity current sensing in demanding vehicular environments.
Availability
MAX9919FASA+ is available at Aetrix Electronics and suitable for automotive ECU design, industrial motor control, and battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for MAX9919FASA+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for automotive, industrial, and communications markets, with emphasis on high-reliability, low-power, and high-performance solutions.
The MAX9918/MAX9919/MAX9920 family was engineered specifically for high-accuracy current sensing in harsh automotive environments - delivering extended common-mode range, AEC-Q100 qualification, and robust transient immunity for motor, solenoid, and battery monitoring.
FAQ
What is the maximum common-mode voltage the MAX9919FASA+ can handle?
The MAX9919FASA+ supports an input common-mode voltage range of -20V to +75V. This allows direct connection to high-side, low-side, or floating shunt resistors in 12V/24V automotive systems - including operation during reverse-battery conditions (-14V) and inductive kickback events exceeding +60V - without damage or saturation.
Does the MAX9919FASA+ require external gain-setting resistors?
No. The MAX9919FASA+ features laser-trimmed internal resistors that fix its gain at 45V/V. The FB pin must be left unconnected for proper operation. Adding external resistors will disrupt the calibrated gain path and degrade accuracy - unlike the adjustable-gain MAX9918/MAX9920 variants.
How does the MAX9919FASA+ support bidirectional current sensing?
The MAX9919FASA+ supports bidirectional operation by applying a stable reference voltage (typically VCC/2 = 2.5V) to the REFIN pin. When configured this way, the output voltage (OUT) swings symmetrically around REFIN - e.g., +2.5V for forward current and -2.5V for reverse current - enabling true AC-coupled current measurement in H-bridge or regenerative braking circuits.
Is the MAX9919FASA+ qualified for automotive applications?
Yes. The MAX9919FASA+ is AEC-Q100 qualified (Grade 1) and fully specified over -40°C to +125°C. It undergoes rigorous stress testing for temperature cycling, humidity, and mechanical shock - meeting requirements for engine control units, transmission controllers, and other under-hood automotive electronics.
What is the recommended power-supply bypassing for the MAX9919FASA+?
A 0.1µF ceramic capacitor must be placed as close as possible between the VCC pin and GND. This minimizes high-frequency supply noise coupling into the amplifier's input stage and ensures stable operation during fast current transients. The exposed pad must also be soldered to a solid ground plane to maintain thermal integrity and reduce offset drift.
MAX9919FASA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.9V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 250 kHz
- Current - Input Bias:
- 175 µA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 1mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
MAX9919FASA+ FAQ
1.How can I place an order for MAX9919FASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9919FASA+ 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 MAX9919FASA+ reliable?
The price and inventory of MAX9919FASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9919FASA+ is usually 5 days.
3.What payment methods are accepted for MAX9919FASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9919FASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9919FASA+?
MAX9919FASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9919FASA+ 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 MAX9919FASA+?
For technical support, including MAX9919FASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9919FASA+ requirements.
6.How does Aetrix verify that MAX9919FASA+ is sourced from the original manufacturer or authorized distributors?
All MAX9919FASA+ 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 MAX9919FASA+ meets industry standards.
7.What is the process for return or replacement of MAX9919FASA+?
All MAX9919FASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9919FASA+, 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 MAX9919FASA+ part is unused and in its original packaging.
Return procedure for MAX9919FASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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