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Analog Devices Inc./Maxim Integrated MAX4377HASA
- Part No.:
- MAX4377HASA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4377HASA.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,353
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Product details
Overview
MAX4377HASA 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, and 1.2MHz bandwidth (gain = +100V/V). It operates from +3V to +28V supply, draws 1mA per amplifier, and supports automotive temperature range (−40°C to +125°C), ideal for battery-charger control loops and smart fuel gauges in notebook computers.
For engineers reviewing the MAX4377HASA datasheet, MAX4377HASA pinout, MAX4377HASA application, or MAX4377HASA equivalent, key selection criteria include its dual-channel configuration, fixed +100V/V gain, buffered 2mA-output voltage interface, AEC-Q100-qualified operation, and compatibility with high-common-mode, low-offset current monitoring in space-constrained 8-pin SO packages.
Technical Context
The MAX4377HASA implements a precision high-side sensing architecture using internal current-mirror gain stages and buffered output buffers. Its input common-mode range (0V to +28V) remains fully functional even when VRS+ drops below 2V - though high-accuracy operation is specified above +2V - and is decoupled from VCC, enabling deep-battery-discharge monitoring without ground-path interference.
Each channel delivers a rail-to-rail compatible, buffered voltage output proportional to (RSENSE × ILOAD) × 100, with total output error as low as ±0.5% at +25°C and ±5.5% over full temperature range. The device features 2mA output drive capability into ground-referenced loads, 1µs saturation recovery time, and stable operation with up to 1000pF capacitive load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +100V/V - fixed internal gain enables direct voltage output scaling without external resistors; sets full-scale output to 10V for 100mV sense voltage. |
| Common-Mode Input Range | 0V to +28V - supports monitoring of battery packs down to 0V while maintaining functionality; independent of VCC. |
| Supply Voltage Range | +3V to +28V - allows single-supply operation across wide system rails including 3.3V, 5V, 12V, and 24V industrial/battery systems. |
| Bandwidth | 1.2MHz - sufficient for closed-loop battery-charger control and fast transient current detection in portable power systems. |
| Full-Scale Accuracy | ±0.5% (typ, +25°C) - ensures precise current measurement critical for fuel-gauge calibration and overcurrent protection thresholds. |
| Supply Current per Channel | 1mA (typ) - ultra-low quiescent current preserves battery life in always-on monitoring applications. |
| Operating Temperature | −40°C to +125°C - AEC-Q100 qualified for under-hood automotive and industrial embedded environments. |
Pinout & Package
MAX4377HASA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27mm pitch, RoHS-compliant lead-free finish (+ suffix), and thermal resistance θJA = 195°C/W on multi-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | OUT1, OUT2 | Buffered voltage outputs proportional to sensed current; each drives up to 2mA into ground-referenced loads. |
| 2, 6 | RS1−, RS2− | Load-side terminals of external sense resistors; connect to low-side of RSENSE for each channel. |
| 3, 5 | RS1+, RS2+ | Power-side terminals of external sense resistors; connect to high-voltage source (e.g., battery+) for high-side sensing. |
| 4 | GND | Analog ground reference for internal circuitry and output buffer; must be tied to system ground plane. |
| 8 | VCC | Positive supply input; powers both channels; accepts +3V to +28V with no reverse-polarity protection required. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +100V/V gain | Eliminates need for external gain-setting resistors, reducing BOM count and layout sensitivity in high-precision current paths. |
| Buffered 2mA output drive | Directly interfaces with ADC inputs or comparator thresholds without external op-amp buffering, simplifying signal chain design. |
| 0V to +28V common-mode range | Enables accurate current monitoring during battery deep discharge (<2V) and high-voltage charging phases without signal loss. |
| ±0.5% full-scale accuracy (typ) | Supports tight fuel-gauge resolution and reliable overcurrent trip points in safety-critical battery management systems. |
| AEC-Q100 qualified | Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD robustness per stress test standards. |
Applications
| Battery Charger Control Loop | Smart Fuel Gauge in Notebook PCs |
|---|---|
|
Use Scenario: Real-time current feedback inside switching charger ICs to regulate charge current and terminate charging based on dI/dt or Coulomb counting. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated, high-bandwidth analog feedback to charger controller's error amplifier or ADC. Use Value: Enables <1.2MHz closed-loop response for stable 2A–5A fast-charge regulation and prevents overcharge via precise ±0.5% current measurement. |
Use Scenario: Monitoring bidirectional battery current in Windows/Linux notebooks to compute state-of-charge (SoC) and remaining runtime. IC Role / Device Role / Timing Role: Dual-channel high-side amplifier measuring charge/discharge current through shared sense resistor with polarity-aware output mapping. Use Value: Delivers 100mV full-scale sense voltage scaled to 10V output, improving ADC SNR and reducing quantization error in fuel-gauge microcontrollers. |
| Automotive Body Control Module (BCM) | Industrial Power Supply Current Limiting |
|
Use Scenario: Detecting abnormal current draw in 12V/24V vehicle subsystems (e.g., lighting, HVAC, seat motors) for fault logging and fuseless protection. IC Role / Device Role / Timing Role: Dual-channel current monitor feeding diagnostic microcontroller with real-time load-current data across two independent circuits. Use Value: −40°C to +125°C operation and AEC-Q100 qualification ensure reliable performance in under-dash environments; 1mA/channel minimizes parasitic drain. |
Use Scenario: Implementing programmable current limiting in 24V industrial DC-DC converters by feeding sensed current into voltage-controlled current-limit circuitry. IC Role / Device Role / Timing Role: High-side amplifier converting RSENSE voltage drop into clean, buffered output used to modulate PWM duty cycle or enable/disable regulator. Use Value: 0V–28V common-mode range accommodates wide input voltage swings; 1.2MHz bandwidth supports fast current-limit response (<1µs recovery). |
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 |
|---|---|---|---|
| MAX4377FASA+ | +50V/V gain (vs. +100V/V); identical package, temp range, and bandwidth (1.7MHz). | Better suited for higher-current ranges where 100mV sense voltage yields >5V output; lower gain reduces noise sensitivity. | Select MAX4377FASA+ when full-scale load current exceeds 5A and system ADC input range is ≤5V. |
| INA240A2DR | TI part with +50V/V gain, wider common-mode (−4V to +80V), higher CMR (120dB), but larger 8-pin SOIC footprint and no AEC-Q100 rating. | Supports negative common-mode for low-side sensing; lacks automotive qualification but offers superior noise rejection in noisy motor-drive environments. | Choose INA240A2DR only if −4V to +80V common-mode or >120dB CMR is required and AEC-Q100 compliance is not mandatory. |
Compared with MAX4377FASA+ and INA240A2DR, MAX4377HASA provides the highest gain (+100V/V) in a compact AEC-Q100-qualified 8-pin SOIC, making it optimal for low-current, high-accuracy applications like notebook fuel gauges where 10V full-scale output maximizes ADC resolution and system-level accuracy.
Availability
MAX4377HASA is available at Aetrix Electronics and suitable for battery charger control loops, smart fuel gauges in notebook PCs, and automotive body control modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified performance.
Supply support for MAX4377HASA 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.
The MAX4376/MAX4377/MAX4378 family was engineered specifically for high-accuracy, high-common-mode, space-constrained current sensing in battery-powered and automotive systems - emphasizing integration, low power, and guaranteed accuracy across extreme temperatures.
FAQ
What is the exact gain setting of MAX4377HASA and how is it implemented?
The MAX4377HASA has a fixed internal gain of +100V/V, indicated by the "H" suffix in its part number. This gain is achieved via laser-trimmed internal resistor ratios and a precision current-mirror architecture - no external components are needed. The output voltage is calculated as VOUT = 100 × (VRS+ − VRS−), delivering 10V for a 100mV differential input. This is confirmed in the Electrical Characteristics table and Pin Descriptions section of the MAX4377HASA datasheet.
Does MAX4377HASA support bidirectional current sensing?
MAX4377HASA is a unidirectional high-side current-sense amplifier optimized for positive current flow from source to load. It does not inherently support bidirectional sensing - its output saturates near ground when VRS− > VRS+. For true bidirectional applications (e.g., charge/discharge monitoring), the MAX4377HAUA+ variant in µMAX package is recommended, or external level-shifting circuitry must be added. This limitation is explicitly noted in the Applications Information section of the MAX4377HASA documentation.
What is the minimum common-mode voltage at which MAX4377HASA maintains specified accuracy?
The MAX4377HASA maintains its ±0.5% full-scale accuracy specification only for VRS+ ≥ +2V. Below +2V - including down to 0V - the device remains functional and outputs a valid voltage, but total output error increases significantly (up to ±32% at VRS+ = 0.1V, per Electrical Characteristics table). This behavior is documented in the "Total OUT Voltage Error vs. Common-Mode Voltage" graph (toc05) and clarified in Revision 5 of the MAX4377HASA datasheet.
Can MAX4377HASA drive a 10kΩ load directly, and what is its output voltage swing?
Yes, MAX4377HASA can directly drive a 10kΩ load. Its buffered output delivers rail-to-rail compatible swing: VOUT(HIGH) = VCC − 0.9V (min) and VOUT(LOW) = 25mV (max) at IOUT = 200µA, per Electrical Characteristics. With a 10kΩ load drawing only ~1mA at 10V output, voltage drop is negligible - the output remains within 1% of ideal across the full temperature range. This is verified in the "OUT High Voltage" and "OUT Low Voltage" specifications.
Is MAX4377HASA pin-compatible with other members of the MAX4376/MAX4377/MAX4378 family in the same package?
Yes, all MAX4377 variants (T/F/H suffixes) in the 8-pin SOIC package (e.g., MAX4377TASA+, MAX4377FASA+, MAX4377HASA+) share identical pinout, footprint, and electrical interface - only gain and minor AC performance (bandwidth, slew rate) differ. This allows drop-in replacement during design iteration or production ramp without PCB changes, as confirmed in the Pin Configurations and Ordering Information tables of the MAX4377HASA datasheet.
MAX4377HASA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SOIC
MAX4377HASA FAQ
1.How can I place an order for MAX4377HASA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377HASA 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 MAX4377HASA reliable?
The price and inventory of MAX4377HASA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377HASA is usually 5 days.
3.What payment methods are accepted for MAX4377HASA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377HASA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377HASA?
MAX4377HASA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377HASA 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 MAX4377HASA?
For technical support, including MAX4377HASA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377HASA requirements.
6.How does Aetrix verify that MAX4377HASA is sourced from the original manufacturer or authorized distributors?
All MAX4377HASA 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 MAX4377HASA meets industry standards.
7.What is the process for return or replacement of MAX4377HASA?
All MAX4377HASA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377HASA, 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 MAX4377HASA part is unused and in its original packaging.
Return procedure for MAX4377HASA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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