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Analog Devices Inc./Maxim Integrated MAX9919FASA/V+
- Part No.:
- MAX9919FASA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MAX9919FASA/V+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,209
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Product details
Overview
MAX9919FASA/V+ from Maxim Integrated is a fixed-gain, AEC-Q100 qualified current-sense amplifier optimized for high-accuracy bidirectional or unidirectional sensing of inductive loads. It features 45V/V gain, ±50mV full-scale input range, -20V to +75V input common-mode voltage, 400µV max input offset voltage, and operates from a single 4.5V–5.5V supply across -40°C to +125°C. It is used in automotive H-bridge motor current monitoring where inductive kickback demands robust negative common-mode tolerance.
For engineers reviewing the MAX9919FASA/V+ datasheet, MAX9919FASA/V+ pinout, MAX9919FASA/V+ application, or MAX9919FASA/V+ equivalent, this page delivers verified technical context, package mapping, real-world use cases, and validated alternative options - all grounded in official Maxim specifications for automotive-grade current sensing.
Technical Context
The MAX9919FASA/V+ employs dual-level-shifting input architecture to support operation across -20V to +75V common-mode voltage, enabling reliable sensing during reverse-battery events or inductive flyback. Its laser-trimmed 45V/V fixed gain eliminates external resistor networks required by adjustable-gain variants like MAX9918.
It supports both unidirectional (REFIN = GND) and bidirectional (REFIN = VCC/2) output referencing, with rail-to-rail output swing and 250kHz small-signal bandwidth. Shutdown mode reduces supply current to ≤10µA, and the exposed-pad SOIC package ensures thermal stability under continuous 1.5mA supply current at +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 45V/V - enables direct interface to 12-bit ADCs with 50mV sense voltage yielding 2.25V output swing. |
| Input Common-Mode Range | -20V to +75V - supports monitoring of solenoids and motors during negative transients without clamping diodes. |
| Input Offset Voltage | ±400µV max - ensures <0.8% error at 50mV full-scale, critical for precision battery charge/discharge control. |
| Supply Voltage | 4.5V to 5.5V - compatible with standard automotive 5V rails and tolerant of cold-crank dips. |
| Bandwidth | 250kHz (-3dB) - captures fast current transients in PWM-driven motor phases without phase lag. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive applications per AEC-Q100 Grade 0. |
| Shutdown Current | ≤10µA - enables low-power sleep modes in always-on vehicle subsystems. |
Pinout & Package
MAX9919FASA/V+ is housed in an 8-pin SOIC package with exposed pad (SO-EP), outline S8E+14, land pattern 90-0151. The exposed pad must be connected to a solid ground plane for optimal thermal performance (θJA = 41°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Positive current-sense input | Connects to power side of shunt; withstands -30V to +80V vs. GND when VCC = 5V. |
| 2 RS- | Negative current-sense input | Connects to load side of shunt; differential input handles ±15V continuously. |
| 3 SHDN | Active-high shutdown control | Drive ≥2.0V to enter shutdown; draws ≤10µA; logic-low (≤0.8V) enables normal operation. |
| 4 GND | Analog and power ground reference | Primary ground return; exposed pad must also connect to same ground plane. |
| 5 OUT | Current-sense amplifier output | Rail-to-rail output drives 100kΩ load; 10mV max VOH/VOL ensures accuracy near supply rails. |
| 6 FB | Feedback input | Left unconnected for MAX9919F - internal gain resistors eliminate external components. |
| 7 REFIN | Reference input | Set to GND for unidirectional output; set to VCC/2 for bidirectional ±VOUT relative to reference. |
| 8 VCC | Positive supply input | Requires 0.1µF ceramic bypass capacitor to GND; operates over 4.5V–5.5V range. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualification | Qualified per Grade 0 (-40°C to +125°C), enabling use in safety-critical automotive powertrain and chassis systems. |
| Wide common-mode range | -20V to +75V allows direct sensing on high-side or low-side of 12V/24V/48V systems without level-shifting circuitry. |
| Laser-trimmed fixed gain | 45V/V gain with ±0.45% max gain error at +25°C eliminates gain-setting resistors and associated layout sensitivity. |
| Rail-to-rail output | Enables full utilization of ADC input range without external level-shifting, reducing BOM count and signal chain error sources. |
| Exposed thermal pad | Reduces junction-to-ambient thermal resistance to 41°C/W, supporting continuous operation at +125°C ambient. |
Applications
| H-Bridge Motor Current Sensing | Solenoid Current Sensing |
|---|---|
Use Scenario: Real-time phase current measurement in automotive electric power steering (EPS) H-bridge drivers. IC Role / Device Role / Timing Role: High-side or low-side current-sense amplifier providing analog feedback to MCU PWM controllers. Use Value: Enables precise torque control and overcurrent protection during rapid direction reversal, leveraging -20V to +75V common-mode tolerance to survive inductive kickback. | Use Scenario: Monitoring coil current in transmission shift solenoids during gear engagement. IC Role / Device Role / Timing Role: Unidirectional current sensor interfacing to 12-bit SAR ADC for closed-loop solenoid current regulation. Use Value: 45V/V gain and ±400µV offset ensure <1% total error at 50mV sense voltage, improving shift timing accuracy and durability. |
| Super-Capacitor Charge/Discharge Monitoring | Precision High-Voltage Current Monitoring |
Use Scenario: Bidirectional current monitoring in 48V mild-hybrid vehicle supercapacitor energy buffers. IC Role / Device Role / Timing Role: Bidirectional current-sense amplifier with REFIN = VCC/2, feeding isolated sigma-delta ADC. Use Value: Fixed 45V/V gain and 250kHz bandwidth capture fast charge/discharge transients while maintaining ±0.9% gain error over full temperature range. | Use Scenario: High-side current sensing in 24V commercial vehicle battery disconnect units. IC Role / Device Role / Timing Role: High-common-mode amplifier placed between battery positive and load, rejecting bus noise up to 75V. Use Value: 96dB CMRR at DC and 86dB at full common-mode range suppresses EMI from adjacent high-current wiring, ensuring stable readings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9919NASA/V+ | Fixed 90V/V gain, same package and AEC-Q100 qualification; 120kHz bandwidth vs. 250kHz. | Better suited for low-voltage sense applications (e.g., 25mV full-scale); lower bandwidth limits high-frequency PWM fidelity. | Select MAX9919NASA/V+ when higher gain is needed to maximize ADC resolution with smaller sense resistors. |
| INA240A1QDRQ1 | Texas Instruments part; 20V/V gain, -4V to 80V common-mode, 4V/V to 500V/V programmable via external resistors. | Wider common-mode range but requires external gain resistors; not laser-trimmed - ±0.2% typical gain error vs. ±0.45% max for MAX9919F. | Choose INA240A1QDRQ1 only if system requires programmable gain or extended -4V lower common-mode limit beyond MAX9919F's -20V capability. |
Compared with MAX9919NASA/V+, MAX9919FASA/V+ offers higher bandwidth for fast transient response; compared with INA240A1QDRQ1, it delivers superior factory-trimmed gain accuracy and zero external component count - critical for space-constrained automotive modules.
Availability
MAX9919FASA/V+ is available at Aetrix Electronics and suitable for automotive H-bridge motor control, solenoid actuation, and 48V mild-hybrid energy storage systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for MAX9919FASA/V+ 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 thermally robust solutions.
The MAX9918/MAX9919/MAX9920 product line was engineered specifically for automotive current sensing - delivering wide common-mode tolerance, AEC-Q100 qualification, and integrated level-shifting to replace discrete op-amp + level-shifter solutions in motor and solenoid control.
FAQ
What is the full-scale input voltage range for MAX9919FASA/V+?
The MAX9919FASA/V+ has a full-scale sense voltage of ±50mV. This means it is designed to accurately amplify differential input voltages up to 50mV with its fixed 45V/V gain, producing a corresponding 2.25V output swing. This range is confirmed in Maxim's datasheet Table "Full-Scale Sense Voltage" and applies across the full -40°C to +125°C operating temperature range.
Is MAX9919FASA/V+ pin-compatible with MAX9919NASA/V+?
Yes, MAX9919FASA/V+ is pin-compatible with MAX9919NASA/V+. Both share identical 8-pin SO-EP packaging, identical pin functions (RS+, RS-, SHDN, GND, OUT, FB, REFIN, VCC), and identical footprint and thermal pad layout. The only functional difference is gain: 45V/V for MAX9919FASA/V+ versus 90V/V for MAX9919NASA/V+ - no PCB changes are required for substitution within the same gain design constraints.
Does MAX9919FASA/V+ require external gain-setting resistors?
No, MAX9919FASA/V+ does not require external gain-setting resistors. As a fixed-gain variant, it integrates laser-trimmed internal resistors to deliver 45V/V gain. The FB pin must be left unconnected per Maxim's pin description - unlike the MAX9918 or MAX9920, which rely on external R1/R2 networks for adjustable gain.
What is the maximum common-mode voltage MAX9919FASA/V+ can handle?
The MAX9919FASA/V+ supports an input common-mode voltage range of -20V to +75V. This is explicitly stated in the "Common-Mode Range" parameter of the Electrical Characteristics table and verified across absolute maximum ratings (RS+/RS- to GND: -30V to +80V at VCC = 5V). This enables operation during reverse-battery conditions and inductive kickback in automotive 12V/24V systems.
Is MAX9919FASA/V+ qualified for automotive applications?
Yes, MAX9919FASA/V+ is AEC-Q100 qualified (Grade 0) and explicitly listed in the "AEC-Q100 Qualified" bullet of the Benefits and Features section. The "/V+" suffix denotes automotive qualification, and the device is fully specified over -40°C to +125°C, with production testing and reliability validation per automotive standards.
MAX9919FASA/V+ 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:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
MAX9919FASA/V+ FAQ
1.How can I place an order for MAX9919FASA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9919FASA/V+ 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/V+ reliable?
The price and inventory of MAX9919FASA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9919FASA/V+ is usually 5 days.
3.What payment methods are accepted for MAX9919FASA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9919FASA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9919FASA/V+?
MAX9919FASA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9919FASA/V+ 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/V+?
For technical support, including MAX9919FASA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9919FASA/V+ requirements.
6.How does Aetrix verify that MAX9919FASA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX9919FASA/V+ 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/V+ meets industry standards.
7.What is the process for return or replacement of MAX9919FASA/V+?
All MAX9919FASA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9919FASA/V+, 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/V+ part is unused and in its original packaging.
Return procedure for MAX9919FASA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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