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Analog Devices Inc./Maxim Integrated MAX9919NASA+
- Part No.:
- MAX9919NASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MAX9919NASA+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,048
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Product details
Overview
The MAX9919NASA+ from Maxim Integrated is a fixed-gain, high-accuracy, unidirectional/bidirectional current-sense amplifier with -20V to +75V input common-mode range, 90V/V gain, ±50mV full-scale sense voltage, and rail-to-rail output. It operates from a single 4.5V–5.5V supply, supports automotive-grade operation from -40°C to +125°C, and is used for precision motor and solenoid current monitoring in H-bridge and high-side/low-side configurations.
For engineers reviewing the MAX9919NASA+ datasheet, MAX9919NASA+ pinout, MAX9919NASA+ application, or MAX9919NASA+ equivalent, key selection criteria include its AEC-Q100 qualification, 120kHz bandwidth, 400µV max input offset voltage, 0.6% max gain accuracy error, and compatibility with bidirectional sensing via VREFIN = VCC/2 - critical for battery charge/discharge and inductive load protection designs.
Technical Context
The MAX9919NASA+ employs dual-level-shifting input architecture to maintain precision across its extended -20V to +75V common-mode range: one stage handles +2V to +75V, another handles -20V to +2V. Its laser-trimmed 90V/V fixed gain eliminates external resistor networks required by adjustable-gain variants like MAX9918.
It supports both unidirectional (VREFIN = GND) and bidirectional (VREFIN = VCC/2) operation, delivering rail-to-rail output referenced either to ground or to VREFIN. The device features internal instrumentation amplification with indirect feedback, enabling high CMRR (96dB over full common-mode range) and low input bias current (±250µA max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 90V/V - delivers 4.5V output for ±50mV input, enabling full ADC utilization with 5V supply |
| Input Common-Mode Range | -20V to +75V - supports negative kickback and reverse-battery conditions without clamping |
| Input Offset Voltage | ±0.4mV max (–40°C to +125°C) - ensures sub-0.5% error at 50mV full-scale sensing |
| Bandwidth | 120kHz (–3dB) - sufficient for PWM-based motor control up to ~20kHz switching with margin |
| Supply Voltage | 4.5V to 5.5V - compatible with standard 5V automotive and industrial rails |
| Temperature Range | –40°C to +125°C - fully specified for under-hood and industrial environments |
| Shutdown Current | ≤10µA - enables low-power sleep modes in battery-powered systems |
Pinout & Package
Package: 8-pin SOIC with exposed pad (SO-EP), RoHS-compliant, thermal resistance θJA = 41°C/W (4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Positive current-sense input | Connects to power side of sense resistor; withstands –30V to +80V vs. GND |
| 2 RS- | Negative current-sense input | Connects to load side of sense resistor; differential input accepts ±15V |
| 3 SHDN | Active-high shutdown control | Drive ≥2.0V to enter shutdown (ICC ≤10µA); tie to GND for normal operation |
| 4 GND | Analog/digital ground reference | Primary ground return; exposed pad must connect to solid ground plane |
| 5 OUT | Current-sense amplifier output | Rail-to-rail output; drives 100kΩ load with <10mV saturation near rails |
| 6 FB | Feedback input | Leave unconnected - unused in MAX9919NASA+ (fixed-gain variant) |
| 7 REFIN | Reference input | Set to GND for unidirectional output; VCC/2 for bidirectional ±VOUT swing |
| 8 VCC | Positive supply input | 4.5V–5.5V supply; requires 0.1µF ceramic bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Qualified for automotive applications per Rev H stress testing - suitable for engine control, ADAS, and body electronics |
| Extended common-mode range | –20V to +75V enables direct sensing in high-voltage battery systems and reverse-polarity tolerant designs |
| Laser-trimmed 90V/V gain | Eliminates external gain-setting resistors and layout sensitivity - improves production yield and long-term stability |
| Bidirectional sensing support | VREFIN = VCC/2 enables symmetric ±2.5V output for charge/discharge current direction detection |
| Rail-to-rail output | Delivers >4.9V output swing with 100kΩ load - maximizes dynamic range for 12-bit+ ADC interfaces |
Applications
| H-Bridge Motor Current Sensing | Solenoid Current Sensing |
|---|---|
Use Scenario: Real-time phase current measurement in 12V/24V automotive H-bridge motor drivers during PWM commutation. IC Role / Device Role / Timing Role: High-side/low-side current-sense amplifier providing isolated analog feedback to MCU ADC with <1µs settling time. Use Value: Enables precise torque control and overcurrent shutdown within 3.5µs (1% settling), preventing MOSFET failure during inductive kickback. | Use Scenario: Monitoring energizing/de-energizing current in 12V automotive solenoids (e.g., transmission shift actuators, fuel injectors). IC Role / Device Role / Timing Role: Bidirectional current sensor interfaced to microcontroller with VREFIN = VCC/2 to distinguish pull-in vs. hold current. Use Value: Detects coil open-circuit or short-circuit faults using ±50mV full-scale range and 120kHz bandwidth - captures fast turn-off transients. |
| Super-Capacitor Charge/Discharge Monitoring | Precision High-Voltage Current Monitoring |
Use Scenario: Bidirectional current measurement across supercapacitor bank in energy recovery systems (e.g., regenerative braking, UPS hold-up). IC Role / Device Role / Timing Role: Unidirectional/bidirectional current-sense amplifier with rail-to-rail output feeding precision SAR ADC. Use Value: ±0.4mV offset and 0.6% gain error ensure <1% total current measurement error over –40°C to +125°C - critical for state-of-charge estimation. | Use Scenario: High-side current monitoring in 48V mild-hybrid vehicle DC/DC converters and battery disconnect units. IC Role / Device Role / Timing Role: High-common-mode amplifier placed between 48V bus and ground-referenced controller, rejecting >96dB of common-mode noise. Use Value: –20V to +75V input range accommodates load dump transients and reverse-battery events without external protection diodes. |
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+ | Fixed 45V/V gain, same package and temperature grade; 250kHz bandwidth vs. 120kHz | Better suited for higher-speed current loops (e.g., fast-switching GaN inverters) where lower gain reduces output swing requirements | Select MAX9919FASA+ when full-scale output must stay below 2.25V for 50mV sense voltage - e.g., interfacing to 2.5V ADC references |
| INA240A1QDRQ1 | TI AEC-Q100 qualified, 20V/V gain, –4V to 80V common-mode, 4V/V to 500V/V selectable gain via pins | Wider common-mode range but lower gain accuracy (±0.9% vs. ±0.6%) and no laser-trimmed fixed 90V/V option | Choose INA240A1QDRQ1 only if system requires programmable gain or operation beyond +75V common-mode - not a drop-in replacement |
Compared with MAX9919FASA+ and INA240A1QDRQ1, the MAX9919NASA+ provides the highest fixed gain (90V/V) and tightest gain accuracy (±0.6%) in an automotive-qualified 8-pin SO-EP package, making it optimal for space-constrained, high-precision 50mV-sense applications where output swing to 4.5V is required.
Availability
MAX9919NASA+ is available at Aetrix Electronics and suitable for H-bridge motor control, solenoid actuation, and supercapacitor energy management requiring stable component supply across automotive production lifecycles.
Supply support for MAX9919NASA+ 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.
The MAX9918/MAX9919/MAX9920 product line delivers high-accuracy current sensing for inductive loads - engineered specifically for automotive motor control, battery management, and fault-tolerant power systems operating across extreme temperatures and voltage transients.
FAQ
What is the maximum common-mode voltage the MAX9919NASA+ can handle?
The MAX9919NASA+ supports an input common-mode voltage range of –20V to +75V. This allows direct connection to high-side or low-side sense resistors in 12V, 24V, and 48V automotive systems, including handling inductive kickback and reverse-battery conditions without external protection circuitry. Absolute maximum ratings extend RS+/RS– to –30V/+80V for 15 minutes at VCC = 0V.
Does the MAX9919NASA+ require external gain-setting resistors?
No, the MAX9919NASA+ does not require external gain-setting resistors. It features laser-trimmed fixed gain of 90V/V, eliminating the need for external R1/R2 networks used in the adjustable-gain MAX9918/MAX9920. Pin 6 (FB) must be left unconnected for proper operation of the MAX9919NASA+.
How do I configure the MAX9919NASA+ for bidirectional current sensing?
To configure the MAX9919NASA+ for bidirectional current sensing, apply a low-impedance reference voltage of VCC/2 to pin 7 (REFIN). This sets the output midpoint to VCC/2, allowing VOUT to swing above and below that point proportionally to positive or negative VSENSE. Ensure REFIN is driven from a stable, low-noise source - internal divider is not recommended.
Is the MAX9919NASA+ qualified for automotive applications?
Yes, the MAX9919NASA+ is AEC-Q100 qualified (Grade 0, –40°C to +125°C ambient), as indicated by the "/V+" suffix in its ordering code. It undergoes full automotive stress testing including HTOL, TC, UHAST, and ESD per AEC-Q100 Rev H, making it suitable for engine control, transmission, and ADAS subsystems.
What is the typical power supply current of the MAX9919NASA+?
The MAX9919NASA+ draws 1.0mA to 1.6mA supply current (ICC) depending on common-mode voltage and temperature, with a maximum of 2.2mA over –40°C to +125°C. In shutdown mode (SHDN ≥2.0V), ICC drops to ≤10µA - enabling ultra-low-power monitoring in always-on vehicle modules.
MAX9919NASA+ 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):
- 4.5 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
MAX9919NASA+ FAQ
1.How can I place an order for MAX9919NASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9919NASA+ 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+ reliable?
The price and inventory of MAX9919NASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9919NASA+ is usually 5 days.
3.What payment methods are accepted for MAX9919NASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9919NASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9919NASA+?
MAX9919NASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9919NASA+ 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+?
For technical support, including MAX9919NASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9919NASA+ requirements.
6.How does Aetrix verify that MAX9919NASA+ is sourced from the original manufacturer or authorized distributors?
All MAX9919NASA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX9919NASA+?
All MAX9919NASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9919NASA+, 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+ part is unused and in its original packaging.
Return procedure for MAX9919NASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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