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Analog Devices Inc./Maxim Integrated MAX49925ATB/VY+T
- Part No.:
- MAX49925ATB/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX49925ATB/VY+T.pdf
- Description:
- NEGATIVE SENSING CSA W/ FAST PWM
- Quantity:
- Payment:
- Shipping:
Inventory:3,855
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Product details
Overview
MAX49925ATB/VY+T from Analog Devices is a bidirectional current-sense amplifier optimized for in-phase motor winding current monitoring in 48V HEV systems, featuring -40V to +76V input common-mode range, 500ns PWM edge recovery from >500V/µs transients, ±0.3% max gain error, and on-the-fly programmable gain (10/20/50/100V/V) via two logic pins.
For engineers reviewing the MAX49925ATB/VY+T datasheet, MAX49925ATB/VY+T pinout, MAX49925ATB/VY+T application, or MAX49925ATB/VY+T equivalent, this page delivers verified technical context, AEC-Q100 Grade 1 qualification status, side-wettable 10-pin TDFN package details, and real-world design implications for high-dV/dt motor control and battery stack monitoring.
Technical Context
The MAX49925ATB/VY+T implements a proprietary input stage architecture that actively suppresses fast PWM common-mode edges up to ±500V/µs without output saturation or recovery delay - critical for accurate phase-current sampling in H-bridge motor drives. Its dual-reference inputs (REF1/REF2) set a precise mid-supply common-mode output point, enabling true bidirectional current polarity detection.
This device operates from a single +2.7V to +5.5V supply across -40°C to +125°C, with rail-to-rail output swing and 300kHz small-signal bandwidth. Input protection extends to -42V/+80V, eliminating need for external TVS diodes in automotive transients, while 140dB DC CMRR ensures stable DC accuracy under high common-mode noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Common-Mode Range | -40V to +76V - supports direct sensing across 48V bus with automotive load-dump transients. |
| PWM Edge Recovery Time | 500ns - enables accurate current sampling within 1µs of PWM switching edge in servo motor control. |
| Gain Options | 10/20/50/100V/V - selectable via GAIN1/GAIN2 logic pins; allows flexible RSENSE selection for <1mΩ to 10mΩ shunts. |
| Input Offset Voltage | ±200µV max over temp - ensures ≤0.5% full-scale error with 1mΩ shunt at 100A, no calibration required. |
| DC CMRR | 140dB - rejects >100V common-mode noise at 100mA sense current, preserving µV-level signal integrity. |
| Supply Range | +2.7V to +5.5V - compatible with 3.3V or 5V microcontroller I/O and ADC reference rails. |
| Temperature Range | -40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood automotive deployment. |
Pinout & Package
Package: 3mm × 3mm, 10-pin TDFN with side-wettable flanks (package code T1033Y+1C), RoHS-compliant, thermally enhanced for automotive PCB reflow inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Power-side sense resistor connection | High-side input referenced to battery positive; withstands -42V to +80V fault conditions. |
| 2 RS- | Load-side sense resistor connection | Low-side input tied to motor/solenoid return; enables bidirectional current polarity detection. |
| 3 N.C. | No internal connection | Must be left floating or grounded per layout best practice; no routing or thermal pad attachment. |
| 4 OUT | Differential output voltage node | Rail-to-rail output centered at VREF = (REF1 + REF2)/2; directly interfaces 12-bit+ SAR ADCs. |
| 5 GND | Signal and power ground reference | Separate low-impedance return path required; must tie to Kelvin sense plane near RSENSE. |
| 6 VDD | Positive supply input | Requires local 10nF COG/NPO + 1µF X5R bypassing; supports 2.7–5.5V operation with 7mA typical IDD. |
| 7 REF2 | Secondary reference input | Used with REF1 to define output common-mode voltage; both must be driven to same potential (e.g., VDD/2). |
| 8 REF1 | Primary reference input | Paired with REF2; sets VREF for bidirectional output swing - e.g., 1.65V with 3.3V supply. |
| 9 GAIN2 | Gain selection bit 1 | Logic-controlled pin (0/1) selecting one of four gains: 10/20/50/100V/V per datasheet truth table. |
| 10 GAIN1 | Gain selection bit 0 | Complements GAIN2; both pins sampled at power-up and latched - no dynamic reconfiguration during operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fast PWM rejection architecture | Recovers in 500ns from ±500V/µs edges - eliminates blanking window in motor control firmware and enables true in-phase sampling. |
| Extended input protection | -42V to +80V immunity - removes need for external TVS diodes in 48V HEV battery monitoring, reducing BOM count and board area. |
| On-the-fly gain programming | Four discrete gains (10/20/50/100V/V) selected by two logic pins - supports multiple current ranges without hardware change or resistor swapping. |
| Ultra-low offset drift | ≤50nV/°C max TCVOS - maintains sub-0.1% measurement accuracy over full -40°C to +125°C automotive temperature range. |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood use - includes HTOL, TC, ESD, and EM immunity testing per stress test plan. |
Applications
| 48V Hybrid Electric Vehicle Battery Stack Monitoring | H-Bridge Motor Phase-Current Sensing |
|---|---|
|
Use Scenario: Real-time cell-balancing and SOC estimation in 12–16-cell 48V Li-ion battery packs with regenerative braking currents. IC Role / Device Role / Timing Role: Bidirectional current-sense amplifier measuring charge/discharge current through low-value shunt with ±500A peak capability. Use Value: -40V to +76V common-mode range accommodates full pack voltage swing; 500ns PWM rejection prevents corruption during active balancing pulses. |
Use Scenario: In-line current feedback for field-oriented control (FOC) of 48V BLDC motors in electric power steering (EPS) and HVAC compressors. IC Role / Device Role / Timing Role: High-speed CSA placed between motor phase and low-side MOSFET, sampling current during PWM off-time and active periods. Use Value: 300kHz bandwidth and 500ns recovery enable sampling within 1µs of PWM edge - critical for torque ripple reduction and current loop stability. |
| Solenoid Actuator Current Control | Industrial High-Power DC Motor Protection |
|
Use Scenario: Closed-loop current regulation of 24–48V solenoids used in transmission shift actuators and brake-by-wire valves. IC Role / Device Role / Timing Role: Bidirectional CSA detecting coil energization direction and magnitude to prevent thermal runaway and ensure precise stroke timing. Use Value: ±0.3% gain error and 5µV offset ensure <1% full-scale error at 10A–100A range; side-wettable flanks support automated optical inspection (AOI) in high-reliability production. |
Use Scenario: Overcurrent detection and thermal derating in industrial 48V DC motors driving pumps, conveyors, and robotic joints. IC Role / Device Role / Timing Role: Primary current monitor feeding safety PLC or microcontroller ADC, triggering shutdown within 10µs of fault onset. Use Value: -42V/+80V protective immunity survives inductive kickback from 100mH+ loads; rail-to-rail output ensures full ADC utilization without level-shifting. |
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 common-mode range; 100ns PWM recovery; no on-the-fly gain selection. | Best suited for fixed-gain, high-speed applications where gain flexibility is unnecessary and faster recovery is prioritized. | Select INA240A1QDRQ1 when system uses only one shunt value and requires minimal propagation delay (<100ns) over programmable gain. |
| MAX40056ATA+T | Unidirectional only; 100V common-mode; 100kHz bandwidth; no AEC-Q100 qualification; 3.5µV offset. | Applicable for high-voltage unidirectional battery monitoring (e.g., 400V EV packs), not for motor phase-current or regenerative braking. | Select MAX40056ATA+T for cost-sensitive, non-automotive 100V unidirectional sensing where bidirectionality and AEC-Q100 are not required. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the MAX49925ATB/VY+T uniquely combines AEC-Q100 Grade 1 qualification, four-gain programmability, and 500ns PWM recovery in a side-wettable 10-pin TDFN - making it the only option for automotive-grade, flexible-range, high-dV/dt motor current sensing.
Availability
MAX49925ATB/VY+T is available at Aetrix Electronics and suitable for 48V hybrid electric vehicle battery management, H-bridge motor control, solenoid actuation, and industrial DC motor protection requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for MAX49925ATB/VY+T 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+T belongs to Analog Devices' automotive-qualified current-sense amplifier product line, designed specifically for robust, high-accuracy current measurement in noisy, high-transient environments like 48V HEV powertrains and motor control systems.
FAQ
What is the maximum common-mode voltage the MAX49925ATB/VY+T can withstand without damage?
The MAX49925ATB/VY+T has absolute maximum ratings of -42V to +80V on RS+ and RS- pins relative to GND, providing robust protection against reverse-battery events and load-dump transients in 48V automotive systems. This extended immunity eliminates need for external TVS diodes in most HEV applications, reducing BOM cost and PCB footprint. The MAX49925ATB/VY+T maintains functional operation across -40V to +76V common-mode range.
How does the MAX49925ATB/VY+T achieve 500ns PWM edge recovery?
The MAX49925ATB/VY+T uses a proprietary input-stage architecture that actively cancels fast common-mode dV/dt disturbances up to ±500V/µs, preventing output saturation and enabling full recovery within 500ns. This is achieved through internal high-speed feedback paths and optimized transistor-level design - not external filtering. The MAX49925ATB/VY+T datasheet confirms this behavior under 500V/µs slew-rate test conditions with 0 to 50V edges.
Can the gain of the MAX49925ATB/VY+T be changed dynamically during operation?
No - the gain of the MAX49925ATB/VY+T is latched at power-up based on the logic states of GAIN1 and GAIN2 pins and remains fixed until next power cycle. It supports four static gain settings (10/20/50/100V/V) but does not allow real-time reconfiguration. For applications requiring runtime gain adjustment, external multiplexing of shunt resistors or post-amplification stages is required. The MAX49925ATB/VY+T specification explicitly defines gain as "on-the-fly programmable" only at initialization.
Is the MAX49925ATB/VY+T compatible with Kelvin-sense PCB layouts?
Yes - the MAX49925ATB/VY+T is explicitly designed for Kelvin-sense configurations. Its RS+ and RS- inputs accept force-and-sense connections directly at the shunt resistor pads, minimizing parasitic trace resistance errors. The datasheet provides Figure 1 showing recommended routing: short, symmetric, tightly coupled traces from shunt pads to RS+ and RS- pins, with GND return routed adjacent to minimize loop area. This ensures <0.1% measurement error even at 100A.
Does the MAX49925ATB/VY+T require external reference voltage sources?
No - the MAX49925ATB/VY+T uses internal reference generation but requires externally applied voltages on REF1 and REF2 pins to set the output common-mode level (VREF = (REF1 + REF2)/2). These pins are typically tied together and driven to VDD/2 using a resistor divider or low-noise buffer. No external precision reference IC is needed, but REF1/REF2 must be actively driven - floating these pins will cause undefined output behavior. The MAX49925ATB/VY+T datasheet specifies this configuration in all application circuits.
MAX49925ATB/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Single Ended, 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-TDFN (3x3)
MAX49925ATB/VY+T FAQ
1.How can I place an order for MAX49925ATB/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX49925ATB/VY+T 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+T reliable?
The price and inventory of MAX49925ATB/VY+T 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+T is usually 5 days.
3.What payment methods are accepted for MAX49925ATB/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX49925ATB/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX49925ATB/VY+T?
MAX49925ATB/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX49925ATB/VY+T 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+T?
For technical support, including MAX49925ATB/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX49925ATB/VY+T requirements.
6.How does Aetrix verify that MAX49925ATB/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX49925ATB/VY+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX49925ATB/VY+T?
All MAX49925ATB/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX49925ATB/VY+T, 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+T part is unused and in its original packaging.
Return procedure for MAX49925ATB/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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