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Analog Devices Inc./Maxim Integrated MAX4377HAUA+
- Part No.:
- MAX4377HAUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4377HAUA+.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,702
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Product details
Overview
MAX4377HAUA+ from Maxim Integrated is a dual-channel, high-side current-sense amplifier with fixed +100V/V gain, 0V to +28V input common-mode range independent of supply voltage, ±0.5% typical full-scale accuracy at +25°C, 2mA buffered output drive, and operation over -40°C to +125°C for battery-charger feedback loops in automotive and portable systems.
For engineers reviewing the MAX4377HAUA+ datasheet, MAX4377HAUA+ pinout, MAX4377HAUA+ application, or MAX4377HAUA+ equivalent, key selection criteria include its dual-channel configuration, µMAX-8 package footprint, 100V/V gain setting, high common-mode rejection (90dB), and compatibility with low-value external sense resistors for precise high-side current monitoring in space-constrained power management designs.
Technical Context
The MAX4377HAUA+ implements a precision high-side sensing architecture using internal current-mirror gain stages and buffered voltage outputs, eliminating external gain-setting resistors. Its input stage operates with rail-to-rail common-mode capability down to 0V, enabling accurate current measurement even during deep battery discharge.
Each channel features a dedicated RS+ and RS− pair referenced to the high-side power rail, with independent OUT pins driving ground-referenced loads up to 2mA. The device maintains stable performance across +3V to +28V supply voltage and exhibits 1.2MHz bandwidth at +100V/V gain, optimized for closed-loop battery charger control response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +100V/V - sets full-scale output to 10V for 100mV sense voltage, enabling high-resolution current measurement with low RSENSE values |
| Common-Mode Input Range | 0V to +28V - supports direct connection to battery packs and high-voltage rails without level-shifting circuitry |
| Supply Voltage Range | +3V to +28V - allows single-supply operation across wide input voltage domains including automotive 12V/24V systems |
| Full-Scale Sense Voltage | 150mV - defines maximum differential input before saturation; enables use of standard low-inductance shunt resistors |
| Bandwidth | 1.2MHz - sufficient for real-time current feedback in switching charger control loops with <800ns settling time |
| Supply Current per Amplifier | 1mA (typ) - minimizes system power overhead in always-on monitoring applications such as fuel gauging |
| Total Output Voltage Error | ±0.5% (typ, +25°C) - ensures high-accuracy current reporting critical for battery state-of-charge estimation |
Pinout & Package
MAX4377HAUA+ is housed in an 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal enhancement. It is RoHS-compliant (+ suffix) and AEC-Q100 qualified for automotive use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | OUT1, OUT2 | Buffered voltage outputs proportional to sensed current; each drives ≥2mA into ground-referenced loads |
| 2, 6 | RS−1, RS−2 | Load-side terminals of external sense resistors; referenced to load ground, not device GND |
| 3, 5 | RS+1, RS+2 | Power-rail side terminals of external sense resistors; accept 0V–28V common-mode inputs |
| 4 | GND | Analog ground reference for internal circuitry and output stage; separate from sense resistor return path |
| 8 | VCC | Positive supply input; powers both amplifiers and output buffers; decoupling capacitor required at pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +100V/V gain | Eliminates external gain resistors and layout sensitivity, reducing BOM count and improving temperature stability |
| ±0.5% full-scale accuracy (typ) | Enables precise battery charge/discharge current tracking for fuel gauge algorithms in smart battery systems |
| 0V to +28V common-mode range | Permits direct high-side sensing on deeply discharged batteries or >VCC rails without auxiliary bias networks |
| 2MHz bandwidth at +20V/V (1.2MHz at +100V/V) | Supports fast transient response in switching regulator current limiting and overcurrent protection circuits |
| Buffered 2mA output drive | Directly interfaces with ADC inputs or comparator thresholds without external op-amp buffering stages |
| AEC-Q100 qualified | Validated for automotive-grade reliability across -40°C to +125°C, suitable for engine control and ADAS power monitoring |
Applications
| Battery Charger Feedback Loop | Automotive Smart Fuse Monitoring |
|---|---|
|
Use Scenario: Real-time current sensing inside constant-current/constant-voltage battery charging circuits for Li-ion packs in EVs and HEVs. IC Role / Device Role / Timing Role: Dual-channel high-side current monitor providing isolated feedback signals to charger controller PWM logic. Use Value: Enables tight current regulation (<±1%) across full battery voltage range (0–28V), improving charge efficiency and cell longevity. |
Use Scenario: Continuous monitoring of branch currents in automotive power distribution units to detect overloads and enable electronic fuse tripping. IC Role / Device Role / Timing Role: Dual high-side sensor feeding two independent protection channels for redundant safety-critical current detection. Use Value: Delivers sub-millisecond fault response with ±0.5% accuracy, meeting ISO 26262 ASIL-B functional safety requirements. |
| Fuel Gauge in Portable PCs | PA Bias Control in RF Power Modules |
|
Use Scenario: Bidirectional current measurement in laptop battery packs to compute remaining capacity and health metrics. IC Role / Device Role / Timing Role: Dual amplifier configured for forward/reverse current sensing via shared sense resistor and polarity-aware signal routing. Use Value: Achieves <1% SOC error over lifetime by maintaining stable gain and offset across temperature and aging. |
Use Scenario: Dynamic bias current adjustment for GaN or LDMOS power amplifiers based on real-time PA supply current draw. IC Role / Device Role / Timing Role: High-bandwidth (+100V/V) current monitor feeding analog loop compensator to stabilize PA quiescent current under varying RF load. Use Value: Reduces thermal drift-induced distortion by enabling closed-loop bias correction with <1.2MHz bandwidth and 800ns settling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4377FAUA+ | +50V/V gain, 1.7MHz bandwidth, same package and temp range | Better SNR for mid-range currents (1–5A); lower output swing limits full-scale resolution at low RSENSE | Select when higher bandwidth and reduced gain error at low VSENSE are prioritized over maximum output headroom |
| INA240A2DR | Bi-directional sensing, 80V common-mode, SOIC-8, ±20ppm/°C gain drift | Supports reverse current detection and higher voltage rails; wider package pitch eases layout but increases board area | Choose for industrial motor drives requiring bidirectional monitoring and extended voltage tolerance beyond 28V |
Compared with MAX4377HAUA+, the MAX4377FAUA+ offers faster response for moderate-current applications, while the INA240A2DR adds bidirectional capability and higher voltage robustness at the cost of larger footprint and different gain architecture-making MAX4377HAUA+ optimal for compact, unidirectional, high-accuracy 100× gain implementations.
Availability
MAX4377HAUA+ is available at Aetrix Electronics and suitable for automotive current detection, battery charger feedback loops, and portable-system fuel gauging requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for MAX4377HAUA+ 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 power management, sensing, and interface applications in automotive, industrial, and consumer markets.
The MAX4377HAUA+ belongs to the MAX4376/MAX4377/MAX4378 family of high-side current-sense amplifiers engineered specifically for accurate, resistorless current monitoring in battery-powered and automotive systems where ground-path integrity is critical.
FAQ
What is the function of the RS+ and RS− pins on the MAX4377HAUA+?
The RS+ and RS− pins on the MAX4377HAUA+ form the differential input pair for each channel's high-side current sense path. RS+ connects to the positive side of the external sense resistor (e.g., battery or power rail), while RS− connects to the load side. This configuration enables measurement of current flowing from source to load without disturbing the system ground reference, preserving signal integrity in sensitive analog and digital subsystems.
Does the MAX4377HAUA+ support bidirectional current sensing?
The MAX4377HAUA+ is designed for unidirectional high-side current sensing only. Its internal architecture produces a positive output voltage proportional to forward current flow (RS+ > RS−). For bidirectional applications such as smart battery fuel gauging, external circuitry like an inverting amplifier or a dedicated bidirectional device (e.g., MAX40080) must be used alongside the MAX4377HAUA+.
What is the minimum sense resistor value recommended for use with the MAX4377HAUA+?
Based on the MAX4377HAUA+'s 150mV full-scale sense voltage and +100V/V gain, a minimum practical RSENSE is ~2mΩ for 7.5A full-scale current. However, for optimal accuracy and noise immunity, Maxim recommends ≥10mΩ (e.g., 10mΩ yields 1V output at 100mV sense drop). Lower values increase susceptibility to PCB trace resistance and thermal EMF errors, especially below 5mΩ.
Can the MAX4377HAUA+ operate with a 3.3V supply voltage?
Yes, the MAX4377HAUA+ operates over a supply voltage range of +3V to +28V, fully supporting 3.3V single-supply systems. At VCC = 3.3V, the output swing is limited to approximately 2.1V (VCC − 1.2V), which remains compatible with most 3.3V ADCs when paired with appropriate RSENSE sizing to keep VOUT within this range.
Is the MAX4377HAUA+ pin-compatible with other variants in the MAX4377 family?
Yes, all MAX4377 variants-including MAX4377TAUA+, MAX4377FAUA+, and MAX4377HAUA+-share identical 8-pin µMAX® pinouts and package dimensions. Gain differences are implemented internally; no PCB layout changes are required when substituting between T (20×), F (50×), or H (100×) versions, enabling flexible design iteration and BOM optimization.
MAX4377HAUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 120 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 1mA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 28 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4377HAUA+ FAQ
1.How can I place an order for MAX4377HAUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377HAUA+ 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 MAX4377HAUA+ reliable?
The price and inventory of MAX4377HAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377HAUA+ is usually 5 days.
3.What payment methods are accepted for MAX4377HAUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377HAUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377HAUA+?
MAX4377HAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377HAUA+ 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 MAX4377HAUA+?
For technical support, including MAX4377HAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377HAUA+ requirements.
6.How does Aetrix verify that MAX4377HAUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4377HAUA+ 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 MAX4377HAUA+ meets industry standards.
7.What is the process for return or replacement of MAX4377HAUA+?
All MAX4377HAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377HAUA+, 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 MAX4377HAUA+ part is unused and in its original packaging.
Return procedure for MAX4377HAUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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