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Analog Devices Inc./Maxim Integrated MAX49925ATB/VY+
- Part No.:
- MAX49925ATB/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX49925ATB/VY+.pdf
- Description:
- IC CSA W/ FAST PWM REJ
- Quantity:
- Payment:
- Shipping:
Inventory:927
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Product details
Overview
MAX49925ATB/VY+ from Analog Devices is a bidirectional current-sense amplifier designed for in-phase motor winding and solenoid current monitoring in 48V HEV systems. It features -40V to +76V input common-mode range, 500ns PWM edge recovery from >500V/µs transients, ±0.3% max gain error, 140dB DC CMRR, and rail-to-rail output - enabling accurate bidirectional sensing under harsh automotive transients.
For engineers reviewing the MAX49925ATB/VY+ datasheet, MAX49925ATB/VY+ pinout, MAX49925ATB/VY+ application, or MAX49925ATB/VY+ equivalent, this page delivers verified technical context, AEC-Q100 Grade 1 qualification status, TDFN-10 side-wettable flanks package details, and real-world selection guidance for high-voltage inductive load monitoring.
Technical Context
The MAX49925ATB/VY+ employs a proprietary input stage optimized to reject fast PWM edges up to ±500V/µs while maintaining stable operation across -40°C to +125°C. Its dual-reference architecture (REF1/REF2) sets output common-mode at VREF = (VREF1 + VREF2)/2, supporting bidirectional current polarity detection with rail-to-rail output swing.
Gain is selected via two logic inputs (GAIN1/GAIN2), offering four discrete options: 10V/V, 20V/V, 50V/V, and 100V/V. Input protection extends to -42V/+80V, exceeding standard automotive reverse-battery and load-dump requirements without external TVS diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Common-Mode Range | -40V to +76V - supports direct sensing across 48V bus with full transient margin in HEV/EV power stages. |
| PWM Edge Recovery Time | 500ns - enables clean current measurement during high-frequency H-bridge switching without settling delay. |
| DC CMRR | 140dB - rejects common-mode noise from high-dV/dt motor drive nodes, preserving accuracy in noisy environments. |
| Gain Error | ±0.3% max - ensures <1mV absolute error at 100mΩ sense resistor and 10A load, critical for torque control fidelity. |
| Supply Voltage Range | +2.7V to +5.5V - compatible with standard 3.3V or 5V microcontroller I/O and ADC reference domains. |
| Bandwidth (-3dB) | 300kHz - captures fast current transients in servo and BLDC motor phase-current waveforms. |
| Input Offset Voltage | 5µV (typ), 200µV (max over temp) - enables use of low-value, low-power sense resistors (e.g., 2mΩ) without offset-induced error. |
Pinout & Package
MAX49925ATB/VY+ is housed in a 3mm × 3mm, 10-pin TDFN package with side-wettable flanks (package code T1033Y+1C), optimized for automated optical inspection (AOI) and high-reliability automotive assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Power-side sense resistor terminal | Connects to high-side of shunt; withstands -42V to +80V relative to GND - no external clamping needed. |
| 2 RS- | Load-side sense resistor terminal | Completes Kelvin sense path; differential input accepts ±2V max voltage drop across RSENSE. |
| 3 N.C. | No connection | Internally unconnected; must be left floating or tied to GND per layout best practice. |
| 4 OUT | Differential-sense output | Rail-to-rail output referenced to VREF; polarity indicates current direction (OUT > VREF = forward flow). |
| 5 GND | Signal and power return | Low-impedance ground reference for all analog circuitry; requires dedicated plane under device. |
| 6 VDD | Positive supply input | Accepts 2.7V–5.5V; requires local 10nF COG/NPO + 1µF X5R bypassing to suppress switching noise. |
| 7 REF2 | Reference input 2 | Together with REF1, sets output common-mode voltage VREF = (REF1 + REF2)/2; can be driven externally. |
| 8 REF1 | Reference input 1 | Paired with REF2; allows flexible biasing (e.g., VDD/2 or external DAC) for single-supply signal chain alignment. |
| 9 GAIN2 | Gain selection bit 1 | Logic-level input (VIH ≥ 1.3V, VIL ≤ 0.55V) selecting 20V/V (GAIN1=GND), 50V/V (GAIN2=VDD), or 100V/V (both high). |
| 10 GAIN1 | Gain selection bit 0 | Logic-level input defining gain: 10V/V (both low), 20V/V (GAIN1=VDD), 50V/V (GAIN2=VDD), 100V/V (both high). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive operation from -40°C to +125°C ambient, meeting stress test requirements for engine bay and powertrain modules. |
| On-the-fly programmable gain | Four precise gains (10/20/50/100V/V) set by two digital inputs - enables dynamic range adaptation without hardware change. |
| Extended input protection | -42V to +80V fault tolerance eliminates need for external TVS diodes in 48V HEV battery monitoring and motor control designs. |
| Fast PWM rejection architecture | Proprietary input stage recovers in 500ns from ±500V/µs edges - prevents blanking window insertion and preserves current waveform fidelity. |
| Side-wettable flanks package | T1033Y+1C package enables reliable AOI solder joint inspection - critical for zero-defect automotive production requirements. |
Applications
| 48V Hybrid Electric Vehicle Motor Control | Solenoid Actuator Current Monitoring |
|---|---|
|
Use Scenario: Real-time in-phase current sensing in 48V traction inverters driving PMSM motors, where PWM frequencies exceed 20kHz and bus transients reach ±60V. IC Role / Device Role / Timing Role: Bidirectional CSA providing isolated, high-bandwidth current feedback to motor control MCU for field-oriented control (FOC) and overcurrent protection. Use Value: 500ns PWM recovery and 140dB CMRR eliminate current measurement distortion during gate switching, improving torque ripple <2% and enabling safe 100% duty cycle operation. |
Use Scenario: Monitoring peak hold-and-drop currents in automotive fuel injectors and transmission solenoids powered from 48V battery rails. IC Role / Device Role / Timing Role: High-accuracy, wide common-mode CSA capturing fast solenoid turn-on/turn-off transitions with sub-millisecond timing resolution. Use Value: ±0.3% gain error and 5µV offset enable detection of <50mA current changes across 10mΩ shunts - critical for closed-loop solenoid position control. |
| Battery Stack Cell Balancing Monitor | H-Bridge Phase-Current Sensing |
|
Use Scenario: Bidirectional current measurement across individual cells or modules in 48V lithium-ion battery packs during charge/discharge and active balancing cycles. IC Role / Device Role / Timing Role: CSA interfacing with isolated ADC or microcontroller to report net stack current direction and magnitude with ±100µA resolution. Use Value: -40V to +76V common-mode range allows direct connection across stacked cells without level-shifting, reducing BOM count and isolation complexity. |
Use Scenario: In-line current sensing on each leg of an H-bridge driving industrial DC motors or linear actuators with 0–100% PWM duty cycle. IC Role / Device Role / Timing Role: Precision bidirectional amplifier delivering real-time phase current to safety-critical motor protection logic and thermal derating algorithms. Use Value: Rail-to-rail output and 300kHz bandwidth capture full current waveform including startup inrush and regenerative braking spikes - enabling ISO 13849 PLd-compliant diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | Fixed 20V/V gain; 80V max common-mode; 100kHz bandwidth; no programmable gain pins. | Limited to fixed-gain designs; lower bandwidth restricts use in >15kHz PWM systems. | Select when gain stability and cost are prioritized over dynamic range flexibility and ultra-fast PWM rejection. |
| MAX40056ATA+T | Unidirectional only; 85V common-mode; 500kHz bandwidth; 1.5µV offset; no AEC-Q100 qualification. | Cannot support regenerative braking or solenoid reversal; not certified for automotive under-hood use. | Select for non-automotive, high-speed unidirectional sensing where offset and bandwidth outweigh bidirectionality needs. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the MAX49925ATB/VY+ uniquely combines AEC-Q100 Grade 1 qualification, on-the-fly gain selection, 500ns PWM recovery, and -40V to +76V bidirectional sensing - making it the only option qualified for safety-critical 48V HEV inverter and solenoid control where both polarity detection and transient immunity are mandatory.
Availability
MAX49925ATB/VY+ is available at Aetrix Electronics and suitable for 48V hybrid electric vehicle motor control, solenoid actuator monitoring, and battery stack current sensing requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for MAX49925ATB/VY+ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision signal-chain solutions.
The MAX49925ATB/VY+ belongs to Analog Devices' automotive-qualified current-sense amplifier product line, engineered specifically for high-voltage, high-transient motor control and battery management in 48V HEV/EV architectures.
FAQ
What is the maximum common-mode voltage the MAX49925ATB/VY+ can withstand without damage?
The MAX49925ATB/VY+ has an absolute maximum RS+/RS- to GND rating of -42V to +80V, providing robust protection against reverse-battery conditions and load-dump transients in 48V automotive systems. This extended immunity eliminates the need for external TVS diodes in most applications, reducing BOM cost and PCB area. The guaranteed operating common-mode range remains -40V to +76V across the full -40°C to +125°C temperature range.
How does the MAX49925ATB/VY+ achieve 500ns PWM edge recovery?
The MAX49925ATB/VY+ uses a proprietary input-stage architecture specifically designed to suppress fast common-mode transients. Its internal circuitry actively cancels the effect of slew rates up to ±500V/µs on the differential output, allowing the amplifier to settle within 500ns after a PWM edge. This capability is verified in the datasheet's tS_PWM parameter and enables accurate current sampling without blanking windows - a key advantage over conventional CSAs in high-frequency motor drives.
Can the MAX49925ATB/VY+ be used with a single-ended reference voltage?
Yes - the MAX49925ATB/VY+ supports flexible reference configuration. While REF1 and REF2 are designed for differential reference input (VREF = (REF1 + REF2)/2), they can be tied together to accept a single-ended reference voltage (e.g., VDD/2 or an external DAC output). This simplifies interface with microcontrollers lacking differential reference outputs and maintains full rail-to-rail output swing centered at the chosen VREF level.
Is the MAX49925ATB/VY+ pin-compatible with other devices in the MAX499xx family?
No - the MAX49925ATB/VY+ is not pin-compatible with other MAX499xx variants such as MAX49920 or MAX49926. Although they share the same 10-pin TDFN package footprint, pin functions differ significantly (e.g., MAX49920 uses different gain selection and reference configurations). Layout reuse is not possible without schematic and PCB revision. Always verify pin mapping using the specific device's datasheet.
What is the purpose of the side-wettable flanks on the MAX49925ATB/VY+ package?
The side-wettable flanks on the MAX49925ATB/VY+ (package code T1033Y+1C) expose solderable metal along the vertical edges of the TDFN body, enabling automated optical inspection (AOI) of solder joint quality during reflow. This feature is required for zero-defect manufacturing in automotive electronics and ensures reliable detection of voids, insufficient solder, or bridging - directly supporting IATF 16949 process validation requirements.
MAX49925ATB/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tray
- 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:
- 300 kHz
- Current - Input Bias:
- 3.5 µA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-TDFN (3x3)
MAX49925ATB/VY+ FAQ
1.How can I place an order for MAX49925ATB/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX49925ATB/VY+ 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 MAX49925ATB/VY+ reliable?
The price and inventory of MAX49925ATB/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX49925ATB/VY+ is usually 5 days.
3.What payment methods are accepted for MAX49925ATB/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX49925ATB/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX49925ATB/VY+?
MAX49925ATB/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX49925ATB/VY+ 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 MAX49925ATB/VY+?
For technical support, including MAX49925ATB/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX49925ATB/VY+ requirements.
6.How does Aetrix verify that MAX49925ATB/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX49925ATB/VY+ 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 MAX49925ATB/VY+ meets industry standards.
7.What is the process for return or replacement of MAX49925ATB/VY+?
All MAX49925ATB/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX49925ATB/VY+, 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 MAX49925ATB/VY+ part is unused and in its original packaging.
Return procedure for MAX49925ATB/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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