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Analog Devices Inc./Maxim Integrated MAX9920ASA/V+
- Part No.:
- MAX9920ASA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MAX9920ASA/V+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:624
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Product details
Overview
MAX9920ASA/V+ from Maxim Integrated is a single-supply, AEC-Q100 qualified current-sense amplifier optimized for high-accuracy uni-/bidirectional sensing of inductive loads. It features a -20V to +75V input common-mode range, 200mV full-scale sense voltage (attenuated input), adjustable gain via external resistors, and rail-to-rail output - enabling precision motor/solenoid current monitoring in automotive H-bridge systems with inductive kickback.
For engineers reviewing the MAX9920ASA/V+ datasheet, MAX9920ASA/V+ pinout, MAX9920ASA/V+ application, or MAX9920ASA/V+ equivalent, this page delivers verified technical context, validated pin functions, real-world automotive use cases, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX9920ASA/V+ employs dual level-shifting input stages to support operation across -20V to +75V common-mode voltages: one stage handles +2V to +75V, the other enables negative CM operation down to -20V. Its internal instrumentation amplifier architecture achieves ≤400µV max input offset voltage and ±1.7% max gain error over -40°C to +125°C.
Gain is externally adjustable via FB pin using R1/R2 resistor network, with minimum gain of 7.5V/V. The device attenuates differential input by 4× at the front end, allowing ±100mV bidirectional or 200mV unidirectional full-scale sensing - distinct from the 50mV range of MAX9918/MAX9919. Reference input (REFIN) sets operating mode: GND for unidirectional, VCC/2 for bidirectional output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Common-Mode Range | -20V to +75V - supports reverse-battery, inductive kickback, and transient events in automotive power stages. |
| Full-Scale Sense Voltage | ±100mV (bidirectional) or 200mV (unidirectional) - 4× attenuation enables higher current sensing without increasing RSENSE power loss. |
| Max Input Offset Voltage | ±3.5µV (over temp) - ensures sub-0.5% current measurement error at low load currents with typical 5mΩ–50mΩ sense resistors. |
| Gain Accuracy Error | ±1.7% (max, -40°C to +125°C) - guaranteed performance for closed-loop motor control and battery charge/discharge monitoring. |
| Small-Signal Bandwidth | 230kHz (-3dB) - sufficient for PWM-based current loop sampling up to ~20kHz switching frequencies with phase margin. |
| Supply Voltage Range | 4.5V to 5.5V - compatible with standard automotive 5V LDO rails; no external regulation required. |
| AEC-Q100 Qualification | Qualified per Grade 0 (-40°C to +125°C) - certified for engine bay, transmission, and ADAS ECU applications. |
Pinout & Package
MAX9920ASA/V+ is housed in an 8-pin SOIC package with exposed pad (SO-EP, package code S8E+14), requiring connection of the EP to solid ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Positive current-sense input | Connects to high-side of sense resistor; withstands -30V to +80V (VCC = 5V) - survives load dump and reverse polarity. |
| 2 RS- | Negative current-sense input | Connects to low-side of sense resistor; differential input accepts ±5V continuous - matches 200mV full-scale with 4× attenuation. |
| 3 SHDN | Active-high shutdown control | Drives >2.0V to enter shutdown (ICC_SHDN ≤ 10µA); allows system-level power gating during sleep modes. |
| 4 GND | Analog/digital ground reference | Primary ground return; must be star-connected near EP to minimize ground bounce in high-dI/dt motor phases. |
| 5 OUT | Current-sense amplifier output | Rail-to-rail output (0V to VCC) referenced to GND (unidir) or REFIN (bidir); drives 100kΩ ADC inputs directly. |
| 6 FB | Feedback gain-setting node | Accepts external R1/R2 divider to configure gain ≥7.5V/V; open for MAX9919, but mandatory for MAX9920 calibration. |
| 7 REFIN | Bidirectional reference input | Set to 0V for unidirectional output; set to VCC/2 (0 to VCC–2.4V range) for ±VOUT swing - enables charge/discharge polarity detection. |
| 8 VCC | 5V supply input | Requires local 0.1µF ceramic bypass to GND; supplies internal bias, level shifters, and output stage - no external regulators needed. |
Key Features
| Feature | Design Value |
|---|---|
| 4× input attenuation | Enables 200mV full-scale sensing - reduces I²R losses in RSENSE by 4× vs. 50mV devices, improving efficiency in high-current solenoids. |
| Dual-level shifter architecture | Guarantees stable operation across -20V to +75V CM range - eliminates need for external protection clamps in 24V/48V automotive systems. |
| Adjustable gain (≥7.5V/V) | External R1/R2 network allows precise gain tuning to match ADC input range and optimize SNR - no laser trimming required. |
| Rail-to-rail output | Delivers full dynamic range to 12-bit+ ADCs without level-shifting circuitry - simplifies signal chain and reduces BOM count. |
| AEC-Q100 Grade 0 qualification | Validated for under-hood deployment - meets automotive reliability, ESD, and thermal cycling requirements without derating. |
Applications
| H-Bridge Motor Current Sensing | Solenoid Current Sensing |
|---|---|
|
Use Scenario: Real-time phase current monitoring in 12V/24V automotive BLDC motor drivers with regenerative braking. IC Role / Device Role / Timing Role: High-side and low-side current sensing amplifier providing isolated, high-bandwidth feedback to MCU PWM timers. Use Value: 230kHz bandwidth and ±100mV bidirectional range enable accurate torque control and stall detection during rapid direction reversal. |
Use Scenario: Closed-loop current control of 12V starter solenoids and transmission shift actuators. IC Role / Device Role / Timing Role: Unidirectional current monitor interfacing directly with vehicle body controller ADC inputs. Use Value: 200mV full-scale sensing allows use of 2mΩ–10mΩ low-inductance sense resistors, minimizing thermal drift and power loss. |
| Super-Capacitor Charge/Discharge Monitoring | Precision High-Voltage Current Monitoring |
|
Use Scenario: Bidirectional energy flow measurement in 48V mild-hybrid energy storage systems. IC Role / Device Role / Timing Role: Dual-polarity current sensor feeding CAN/FD gateway with SOC/SOH calculation firmware. Use Value: VREFIN-referenced output and ±1.7% gain accuracy ensure <±0.5% charge/discharge current error over full temperature range. |
Use Scenario: High-side current monitoring in 48V DC-DC converters and battery disconnect units. IC Role / Device Role / Timing Role: High-common-mode amplifier isolating sense signal from noisy 48V bus while rejecting >86dB CM noise. Use Value: -20V to +75V CM range accommodates load dump transients up to +75V without saturation or latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9918ASA/V+ | 50mV full-scale sense voltage, 30V/V minimum gain, same SO-EP package and pinout. | Optimized for lower-current applications (<50A) where 50mV sensing provides better SNR; lacks 200mV attenuation. | Select when sensing smaller currents with higher-precision RSENSE (e.g., <10mΩ) and tighter offset budget is critical. |
| INA240A1QDRQ1 | Texas Instruments AEC-Q100 Grade 1 device; 80V CM range, 20V/V fixed gain, 50µV max VOS, SOIC-8 package. | Fixed-gain, lower offset, but no adjustable gain or 200mV full-scale option; requires external reference for bidirectional use. | Select when ultra-low offset (<50µV) is prioritized over configurability, and system design tolerates fixed gain and separate REF circuitry. |
Compared with MAX9918ASA/V+, MAX9920ASA/V+ offers 4× higher full-scale sensing capability for reduced power loss, while INA240A1QDRQ1 trades adjustability for lower offset and different CMRR/PSRR trade-offs - choice depends on whether gain flexibility or offset minimization dominates the design requirement.
Availability
MAX9920ASA/V+ is available at Aetrix Electronics and suitable for automotive H-bridge motor control, solenoid actuation, super-capacitor energy management, and 48V high-voltage current monitoring requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MAX9920ASA/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 high-performance solutions.
The MAX9918/MAX9919/MAX9920 product line targets automotive-grade current sensing in harsh environments, delivering wide common-mode range, AEC-Q100 qualification, and configurable gain for motor, solenoid, and energy storage applications.
FAQ
What is the maximum full-scale sense voltage supported by MAX9920ASA/V+?
The MAX9920ASA/V+ supports 200mV full-scale sense voltage in unidirectional mode and ±100mV in bidirectional mode due to its integrated 4× input attenuation stage - a key differentiator from the 50mV full-scale of MAX9918/MAX9919. This allows use of lower-value, lower-power sense resistors while maintaining measurement resolution.
How does the gain adjustment work on MAX9920ASA/V+?
The MAX9920ASA/V+ uses an external resistor divider (R1 and R2) connected to the FB pin to set gain, with minimum gain of 7.5V/V. Gain is calculated as G = [1 + (R2/R1)] / 4. This configuration enables precise matching to ADC input ranges and compensates for RSENSE tolerance without requiring factory trimming.
Is MAX9920ASA/V+ qualified for automotive applications?
Yes, MAX9920ASA/V+ is AEC-Q100 qualified (Grade 0, -40°C to +125°C) and specifically designed for automotive use - including under-hood motor control, transmission solenoids, and 48V mild-hybrid systems. The "/V+" suffix explicitly denotes automotive qualification and RoHS compliance.
What is the purpose of the REFIN pin on MAX9920ASA/V+?
The REFIN pin on MAX9920ASA/V+ sets the output reference level: grounding REFIN enables unidirectional output (0V to VCC), while applying VCC/2 enables bidirectional output (VREFIN ± VOUT swing). Its valid range is 0V to VCC–2.4V, supporting robust operation even with supply droop during cranking.
Can MAX9920ASA/V+ operate with negative common-mode voltages?
Yes, MAX9920ASA/V+ operates with common-mode voltages from -20V to +75V - essential for handling inductive kickback in motor/solenoid circuits and reverse-battery conditions. Its dual-level shifter architecture ensures stable amplification across this full range without saturation or phase inversion.
MAX9920ASA/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:
- 1.5V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 230 kHz
- Current - Input Bias:
- 175 µA
- Voltage - Input Offset:
- 480 µV
- Current - Supply:
- 1mA
- Current - Output / Channel:
- 44 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX9920ASA/V+ FAQ
1.How can I place an order for MAX9920ASA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9920ASA/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 MAX9920ASA/V+ reliable?
The price and inventory of MAX9920ASA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9920ASA/V+ is usually 5 days.
3.What payment methods are accepted for MAX9920ASA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9920ASA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9920ASA/V+?
MAX9920ASA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9920ASA/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 MAX9920ASA/V+?
For technical support, including MAX9920ASA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9920ASA/V+ requirements.
6.How does Aetrix verify that MAX9920ASA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX9920ASA/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 MAX9920ASA/V+ meets industry standards.
7.What is the process for return or replacement of MAX9920ASA/V+?
All MAX9920ASA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9920ASA/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 MAX9920ASA/V+ part is unused and in its original packaging.
Return procedure for MAX9920ASA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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