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Analog Devices Inc./Maxim Integrated MAX49925XATB+
- Part No.:
- MAX49925XATB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX49925XATB+.pdf
- Description:
- NEGATIVE SENSING CSA W/ FAST PWM
- Quantity:
- Payment:
- Shipping:
Inventory:490
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Product details
Overview
MAX49925XATB+ from Analog Devices is a bidirectional current-sense amplifier designed for in-phase motor winding 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, 5µV typical input offset voltage, and operates from +2.7V to +5.5V over -40°C to +125°C.
For engineers reviewing the MAX49925XATB+ datasheet, MAX49925XATB+ pinout, MAX49925XATB+ application, or MAX49925XATB+ equivalent, this page delivers verified specifications, automotive-grade AEC-Q100 qualification, TDFN-10 side-wettable flanks package details, and real-world use cases in H-bridge motor control and solenoid sensing.
Technical Context
The MAX49925XATB+ implements a proprietary input stage architecture optimized to reject fast PWM edges up to ±500V/µs without output disturbance, enabling accurate phase-current measurement during active PWM switching. Its dual-reference input (REF1/REF2) sets output common-mode voltage at (VREF1 + VREF2)/2, supporting bidirectional current polarity detection with rail-to-rail output swing.
Gain selection is implemented via two logic-controlled pins (GAIN1/GAIN2), offering four discrete gains-10V/V, 20V/V, 50V/V, and 100V/V-without external components. Input protection extends to -42V/+80V, exceeding standard automotive transients and relaxing TVS diode requirements in 48V battery stack monitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Common-Mode Range | -40V to +76V - supports direct sensing across 48V HEV bus with transient margin |
| PWM Edge Recovery Time | 500ns - enables stable current measurement within one PWM cycle at ≤200kHz switching |
| DC CMRR | 140dB - rejects high-voltage common-mode noise while preserving low-mV sense signals |
| Gain Accuracy | ±0.3% max - ensures <1mV absolute error at 100mΩ shunt with 10A full-scale current |
| Input Offset Voltage | 5µV typ - allows use of low-value, low-power shunts (e.g., 1mΩ) without offset-induced error |
| Bandwidth (-3dB) | 300kHz - captures fast current transients in servo motor commutation and solenoid actuation |
| Operating Temperature | -40°C to +125°C - meets Automotive Grade 1 requirement for under-hood placement |
Pinout & Package
MAX49925XATB+ is housed in a 3mm × 3mm, 10-pin TDFN package with side-wettable flanks (package code T1033+1C), optimized for automated optical inspection (AOI) and high-reliability automotive assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Power-side shunt connection | High-side input for bidirectional current flow; withstands -42V to +80V relative to GND |
| 2 RS- | Load-side shunt connection | Low-side input; differential pair with RS+ defines sense voltage polarity and magnitude |
| 3 N.C. | No connect | Internally unconnected; must remain floating per datasheet layout guidance |
| 4 OUT | Differential output | Rail-to-rail output referenced to (REF1 + REF2)/2; drives 10kΩ load with 20pF capacitance |
| 5 GND | Signal and power return | Primary reference for all analog inputs and outputs; requires low-impedance PCB plane |
| 6 VDD | Supply input | +2.7V to +5.5V single supply; bypassed with 10nF COG/NPO + 1µF X5R capacitors |
| 7 REF2 | Reference input 2 | Second input for setting output common-mode voltage; used with REF1 to define VREF |
| 8 REF1 | Reference input 1 | First input for VREF generation; (REF1 + REF2)/2 determines zero-current output level |
| 9 GAIN2 | Gain select bit 1 | Logic-level input selecting 20V/V (GAIN1=GND), 50V/V (GAIN2=VDD), or 100V/V (both high) |
| 10 GAIN1 | Gain select bit 0 | Logic-level input selecting 10V/V (both low), 20V/V (GAIN1=VDD), or 50V/V (GAIN2=VDD) |
Key Features
| Feature | Design Value |
|---|---|
| Fast PWM rejection | 500ns recovery from ±500V/µs edges - eliminates blanking window in motor phase-current feedback loops |
| On-the-fly gain programming | Four factory-trimmed gains (10/20/50/100V/V) set by two logic pins - enables dynamic range adaptation without firmware change |
| Extended input protection | -42V to +80V immunity - reduces need for external TVS diodes in 48V battery monitoring applications |
| Rail-to-rail output | Drives full output swing from 0V to VDD - maximizes ADC utilization in 3.3V microcontroller systems |
| AEC-Q100 qualified | Grade 1 (-40°C to +125°C) qualification - validated for automotive powertrain and chassis modules |
Applications
| Motor Phase-Current Sensing | Solenoid Actuator Monitoring |
|---|---|
|
Use Scenario: Real-time in-phase current measurement in 3-phase servo motor windings driven by high-frequency PWM inverters. IC Role / Device Role / Timing Role: Bidirectional CSA providing isolated, high-bandwidth current feedback to motor control MCU for field-oriented control (FOC). Use Value: 500ns PWM edge recovery enables continuous sampling during active PWM periods, eliminating dead-time distortion in torque estimation. |
Use Scenario: Closed-loop current regulation in automotive fuel injectors and transmission solenoids operating at 1kHz–20kHz PWM frequencies. IC Role / Device Role / Timing Role: High-CMRR current monitor interfacing directly to solenoid driver ICs, rejecting EMI from adjacent power stages. Use Value: -40V to +76V common-mode range accommodates reverse-battery conditions and inductive kickback without external clamping. |
| Battery Stack Current Monitoring | H-Bridge Motor Control |
|
Use Scenario: Bidirectional current tracking across 12S–16S Li-ion battery stacks in 48V mild-hybrid vehicles. IC Role / Device Role / Timing Role: Precision shunt amplifier feeding isolated sigma-delta ADC for SOC/SOH calculation and charge/discharge balancing. Use Value: ±0.3% gain error and 5µV offset ensure <0.5% full-scale current accuracy over lifetime and temperature drift. |
Use Scenario: In-line current sensing on high-side and low-side legs of automotive H-bridge drivers for electric power steering (EPS). IC Role / Device Role / Timing Role: Fault-tolerant current sensor detecting overcurrent, short-circuit, and open-load conditions in real time. Use Value: -42V to +80V protective immunity prevents latch-up during load dump events (ISO 7637-2 Pulse 5a), improving system robustness. |
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; 4V/V to 500V/V variants available; 800kHz bandwidth; no programmable gain pins | Higher bandwidth suits faster switching converters; lacks on-the-fly gain reconfiguration | Select when fixed-gain simplicity and higher AC performance outweigh flexibility needs |
| MAX40056ATA+T | Unidirectional only; 100V/V fixed gain; 1.5MHz bandwidth; -5V to +65V common-mode range | Optimized for high-side unidirectional sensing in DC-DC converters; not suitable for bidirectional motor control | Select only for unidirectional applications where extended high-side range and speed are primary |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the MAX49925XATB+ uniquely combines programmable gain, bidirectional operation, automotive-grade transient immunity, and sub-µs PWM rejection-making it the only option among the three qualified for in-phase motor winding sensing in AEC-Q100-compliant 48V HEV systems.
Availability
MAX49925XATB+ is available at Aetrix Electronics and suitable for 48V hybrid electric vehicle (HEV) powertrain modules, industrial servo motor controllers, and automotive battery management systems requiring stable component supply and long-term lifecycle support.
Supply support for MAX49925XATB+ 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 industrial, automotive, communications, and healthcare markets since 1965.
The MAX49925XATB+ belongs to Analog Devices' precision current-sense amplifier product line, engineered specifically for robust, high-accuracy current monitoring in automotive 48V systems and industrial motor drives subject to extreme voltage transients.
FAQ
What is the maximum common-mode voltage the MAX49925XATB+ can withstand without damage?
The MAX49925XATB+ 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 automotive 48V systems. This exceeds the -40V to +76V guaranteed operating common-mode range and enables simplified front-end protection design.
Does the MAX49925XATB+ support true bidirectional current sensing with polarity indication?
Yes, the MAX49925XATB+ supports true bidirectional sensing: when current flows from RS+ to RS-, the output voltage rises above the common-mode reference (VREF = (REF1 + REF2)/2); when current reverses, the output falls below VREF. This polarity-sensitive rail-to-rail output enables direct interface with single-supply ADCs for closed-loop motor control.
How does the MAX49925XATB+ achieve 500ns PWM edge recovery?
The MAX49925XATB+ uses a proprietary input-stage architecture that actively suppresses fast common-mode dV/dt transients. Tested with ±500V/µs slew-rate edges, its internal circuitry recovers output stability within 500ns-enabling accurate current sampling even during active PWM switching without blanking intervals or external filtering.
Is the MAX49925XATB+ pin-compatible with other devices in the MAX499xx family?
Yes, the MAX49925XATB+ shares identical pinout, package (10-pin TDFN), and footprint with MAX49920, MAX49921, and MAX49926. This allows drop-in replacement across variants differing in gain, bandwidth, or PWM rejection performance-facilitating design reuse and BOM consolidation in multi-platform automotive programs.
What is the significance of side-wettable flanks in the MAX49925XATB+ TDFN package?
The side-wettable flanks on the MAX49925XATB+ TDFN package enable reliable automated optical inspection (AOI) of solder joint quality on the outer perimeter of the leads. This feature is required for automotive manufacturing compliance (e.g., IATF 16949) and improves process yield in high-volume SMT assembly of safety-critical powertrain modules.
MAX49925XATB+ 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:
- 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
- Supplier Device Package:
- 10-TDFN (3x3)
MAX49925XATB+ FAQ
1.How can I place an order for MAX49925XATB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX49925XATB+ 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 MAX49925XATB+ reliable?
The price and inventory of MAX49925XATB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX49925XATB+ is usually 5 days.
3.What payment methods are accepted for MAX49925XATB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX49925XATB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX49925XATB+?
MAX49925XATB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX49925XATB+ 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 MAX49925XATB+?
For technical support, including MAX49925XATB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX49925XATB+ requirements.
6.How does Aetrix verify that MAX49925XATB+ is sourced from the original manufacturer or authorized distributors?
All MAX49925XATB+ 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 MAX49925XATB+ meets industry standards.
7.What is the process for return or replacement of MAX49925XATB+?
All MAX49925XATB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX49925XATB+, 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 MAX49925XATB+ part is unused and in its original packaging.
Return procedure for MAX49925XATB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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