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Analog Devices Inc./Maxim Integrated MAX9919NASA/V+
- Part No.:
- MAX9919NASA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MAX9919NASA/V+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,074
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Product details
Overview
MAX9919NASA/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 delivers 90V/V gain, ±50mV full-scale input range, -20V to +75V common-mode voltage support, and operates from a single 4.5V–5.5V supply across -40°C to +125°C - enabling precise motor and solenoid current monitoring in automotive H-bridge systems.
For engineers reviewing the MAX9919NASA/V+ datasheet, MAX9919NASA/V+ pinout, MAX9919NASA/V+ application, or MAX9919NASA/V+ equivalent, this page provides verified technical context, validated pin functions, real-world automotive use cases, and confirmed alternative parts with documented functional differences - all grounded in Maxim's official electrical characteristics and ordering guide.
Technical Context
The MAX9919NASA/V+ employs dual-level-shifting input architecture to maintain precision across its -20V to +75V common-mode range: one stage handles +2V to +75V, another handles -20V to +2V. Its laser-trimmed 90V/V gain eliminates external resistor networks, reducing layout sensitivity and drift.
It supports both unidirectional (REFIN = GND) and bidirectional (REFIN = VCC/2) operation with rail-to-rail output, 120kHz -3dB bandwidth, and 400µV max input offset voltage over temperature - making it suitable for high-dynamic-range current feedback in safety-critical automotive power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 90V/V - enables direct 50mV sense voltage scaling to 4.5V full-scale output at 5V supply, eliminating gain-setting resistors and associated tolerance errors. |
| Input Common-Mode Range | -20V to +75V - supports negative kickback during motor commutation and reverse-battery conditions without saturation or damage. |
| Full-Scale Sense Voltage | ±50mV - matches standard low-value shunt resistors (e.g., 5–50mΩ), minimizing I²R loss while maintaining signal-to-noise ratio. |
| Input Offset Voltage (max) | 400µV - ensures ≤0.8% error at 50mV full-scale, critical for accurate low-current detection in battery management and solenoid control. |
| -3dB Bandwidth | 120kHz - captures fast current transients in PWM-driven motors and switching regulators without phase lag or distortion. |
| Supply Voltage Range | 4.5V to 5.5V - compatible with automotive 5V rails and tolerant of battery voltage fluctuations during cranking or load dump. |
| AEC-Q100 Qualification | Qualified - certified for automotive applications per Grade 0 (-40°C to +125°C), including stress testing for reliability in engine control and ADAS subsystems. |
Pinout & Package
MAX9919NASA/V+ is housed in an 8-pin SOIC package with exposed pad (SO-EP), optimized for thermal dissipation in high-power automotive environments. The exposed pad must be connected to a solid ground plane for proper thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Positive current-sense input | Connects to high-side of shunt resistor; withstands -20V to +75V common-mode voltage - supports high-side and low-side sensing topologies. |
| 2 RS- | Negative current-sense input | Connects to low-side of shunt; differential input pair rejects common-mode noise and enables accurate VSENSE measurement. |
| 3 SHDN | Active-high shutdown control | Pulling high reduces supply current to ≤10µA - enables power gating during system sleep modes without external circuitry. |
| 4 GND | Analog and power ground reference | Primary return path for internal bias currents; must be tied to low-impedance ground plane to minimize offset drift. |
| 5 OUT | Current-sense amplifier output | Rail-to-rail output drives ADC inputs directly; output swing stays ≥100mV from rails to maintain specified gain accuracy. |
| 6 FB | Feedback input | No connection required - left floating for MAX9919N operation; internal gain network eliminates need for external resistors. |
| 7 REFIN | Reference input | Set to GND for unidirectional output (0–VCC); set to VCC/2 for bidirectional output (VCC/2 ± ΔV) - defines output zero point. |
| 8 VCC | Positive supply input | 4.5V–5.5V single supply; requires local 0.1µF ceramic bypass capacitor to GND for stability and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed 90V/V gain | Eliminates external gain-setting resistors, reducing BOM count, layout area, and gain drift over temperature and time. |
| Dual-level-shifting input stage | Enables seamless operation across -20V to +75V common-mode range - no external clamping or level translation needed for inductive kickback. |
| Rail-to-rail output with 100mV headroom | Ensures full accuracy across entire output swing; simplifies interface to 12-bit+ SAR or delta-sigma ADCs without signal conditioning. |
| AEC-Q100 Grade 0 qualification | Validated for under-hood automotive use - includes HTOL, TC, ESD, and mechanical stress testing per JEDEC standards. |
| Exposed thermal pad (SO-EP) | Reduces θJA to 41°C/W on 4-layer board - sustains continuous operation at 1.5mA supply current even at +125°C ambient. |
Applications
| H-Bridge Motor Current Sensing | Solenoid Current Sensing |
|---|---|
Use Scenario: Real-time phase current measurement in 12V/24V automotive BLDC motor controllers using high-side and low-side shunts. IC Role / Device Role / Timing Role: Precision current-sense amplifier providing bidirectional analog output synchronized to PWM switching edges. Use Value: Enables field-oriented control (FOC) with <0.8% total current error at 125°C - critical for torque ripple reduction and thermal derating. | Use Scenario: Monitoring energizing/de-energizing current in transmission solenoids and fuel injectors during cold-start and gear-shift events. IC Role / Device Role / Timing Role: High-CMRR analog front-end converting milliohm-shunt voltage into clean, stable ADC input. Use Value: Supports fast 120kHz transient capture of solenoid turn-on spikes and decay tails - improves diagnostic accuracy for ASAM-compliant UDS services. |
| Super-Capacitor Charge/Discharge Monitoring | Precision High-Voltage Current Monitoring |
Use Scenario: Bidirectional current tracking in 48V mild-hybrid energy storage systems with regenerative braking and start-stop functions. IC Role / Device Role / Timing Role: Unidirectional/bidirectional current sensor referenced to VCC/2, interfacing directly to microcontroller ADC. Use Value: Delivers ±50mV full-scale range with 400µV offset - achieves ±0.5A resolution on 10mΩ shunt at 50A full scale, enabling SOC estimation within ±1.2%. | Use Scenario: High-side current monitoring in automotive DC-DC converters handling up to 75V bus voltages (e.g., EV onboard chargers). IC Role / Device Role / Timing Role: High-common-mode amplifier isolating sense signal from noisy high-voltage domains without optocouplers or isolated supplies. Use Value: Eliminates need for isolated amplifiers or magnetic sensors - reduces cost and PCB area while maintaining ±0.6% gain error over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9919FASA/V+ | Fixed 45V/V gain, same package and AEC-Q100 qualification; 250kHz bandwidth vs. 120kHz. | Better suited for higher-bandwidth applications like fast-switching GaN converters where lower gain allows larger sense voltage before rail saturation. | Select when full-scale sense voltage exceeds 50mV or when higher bandwidth is prioritized over output dynamic range. |
| INA240A1QDRQ1 | TI device with 20V/V gain, -4V to 80V common-mode, 4V/V to 500V/V selectable via external resistors, 400kHz bandwidth. | Offers programmable gain and wider CM range but requires external resistors and lacks laser-trimmed 90V/V precision; not qualified to AEC-Q100 Grade 0. | Choose when design flexibility across multiple current ranges is needed, and AEC-Q100 Grade 0 is not mandatory. |
Compared with MAX9919FASA/V+, the MAX9919NASA/V+ trades bandwidth for higher gain and tighter offset specs - ideal for precision low-current sensing; versus INA240A1QDRQ1, it offers guaranteed automotive qualification and resistorless 90V/V accuracy at the cost of configurability.
Availability
MAX9919NASA/V+ is available at Aetrix Electronics and suitable for automotive motor control, solenoid actuation, and high-voltage power conversion requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 compliance.
Supply support for MAX9919NASA/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 applications.
The MAX9918/MAX9919/MAX9920 product line was engineered specifically for high-accuracy current sensing in harsh automotive environments - emphasizing wide common-mode range, AEC-Q100 qualification, and robustness against inductive transients.
FAQ
What is the maximum common-mode voltage the MAX9919NASA/V+ can handle?
The MAX9919NASA/V+ supports an input common-mode voltage range of -20V to +75V. This specification is validated per Maxim's absolute maximum ratings and electrical characteristics tables, enabling reliable operation during negative inductive kickback and 75V load-dump transients in 24V automotive systems. The dual-level-shifting architecture ensures accuracy across the full range without external protection components.
Does the MAX9919NASA/V+ require external gain-setting resistors?
No, the MAX9919NASA/V+ does not require external gain-setting resistors. It features laser-trimmed internal resistors that fix the gain at 90V/V. The FB pin is left unconnected in normal operation - unlike the adjustable-gain MAX9918/MAX9920 variants - simplifying layout and eliminating resistor tolerance and temperature drift effects on gain accuracy.
How does the MAX9919NASA/V+ support bidirectional current sensing?
The MAX9919NASA/V+ supports bidirectional current sensing by setting the REFIN pin to VCC/2 (e.g., 2.5V with 5V supply). This establishes the output zero point at mid-supply, so positive VSENSE produces VOUT > VCC/2 and negative VSENSE produces VOUT < VCC/2. The device maintains 90V/V gain and 400µV max offset across the full -40°C to +125°C range, ensuring symmetric accuracy for charge/discharge monitoring.
Is the MAX9919NASA/V+ pin-compatible with other devices in the MAX9918/MAX9919/MAX9920 family?
Yes, the MAX9919NASA/V+ shares identical 8-pin SO-EP pinout and footprint with MAX9918ASA/V+, MAX9919FASA/V+, and MAX9920ASA/V+. All devices use the same pin configuration (RS+, RS-, SHDN, GND, OUT, FB, REFIN, VCC), allowing drop-in replacement in existing layouts - though gain, bandwidth, and full-scale sense voltage differ between variants and must be verified in circuit simulation.
What is the shutdown current consumption of the MAX9919NASA/V+?
The MAX9919NASA/V+ draws ≤10µA (typical 0.5µA) in shutdown mode when the SHDN pin is driven high. This ultra-low quiescent current enables power gating during vehicle sleep modes while maintaining fast wake-up response (<6µs power-up time), supporting ISO 16750-2 compliant low-power requirements for always-on automotive ECUs.
MAX9919NASA/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:
- 3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 120 kHz
- Current - Input Bias:
- 175 µA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 1mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.75 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
MAX9919NASA/V+ FAQ
1.How can I place an order for MAX9919NASA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9919NASA/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 MAX9919NASA/V+ reliable?
The price and inventory of MAX9919NASA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9919NASA/V+ is usually 5 days.
3.What payment methods are accepted for MAX9919NASA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9919NASA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9919NASA/V+?
MAX9919NASA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9919NASA/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 MAX9919NASA/V+?
For technical support, including MAX9919NASA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9919NASA/V+ requirements.
6.How does Aetrix verify that MAX9919NASA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX9919NASA/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 MAX9919NASA/V+ meets industry standards.
7.What is the process for return or replacement of MAX9919NASA/V+?
All MAX9919NASA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9919NASA/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 MAX9919NASA/V+ part is unused and in its original packaging.
Return procedure for MAX9919NASA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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