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Analog Devices Inc./Maxim Integrated MAX4377HEUA
- Part No.:
- MAX4377HEUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4377HEUA.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:5,875
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Product details
Overview
MAX4377HEUA from Maxim Integrated is a single high-side current-sense amplifier with fixed +100V/V gain, designed for precision battery-current monitoring in automotive and portable systems. It operates from +3V to +28V supply, supports 0V to +28V input common-mode voltage independent of VCC, delivers ±0.5% typical full-scale accuracy at +25°C, and features buffered 2mA-output voltage output. It is used in battery chargers and fuel gauges where ground-path integrity is critical.
For engineers reviewing the MAX4377HEUA datasheet, MAX4377HEUA pinout, MAX4377HEUA application, or MAX4377HEUA equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional differences.
Technical Context
The MAX4377HEUA implements a high-impedance current-sense architecture with internal gain-setting resistors and a precision current-mirror-based signal path. Its input common-mode range (0V to +28V) remains fully functional even when VRS+ falls below VCC - enabling deep-discharge battery monitoring without loss of accuracy.
It uses BiCMOS process technology to achieve 2MHz bandwidth at +100V/V gain, 1µs saturation recovery time, and ±5.5% gain accuracy over -40°C to +125°C. The buffered output drives up to 2mA into ground-referenced loads while maintaining <5Ω output resistance and <1% total output error at 100mV sense voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +100V/V - sets full-scale output to 10V for 100mV sense voltage; eliminates external gain resistors. |
| Common-Mode Input Range | 0V to +28V - enables direct connection to battery anode during deep discharge without supply dependency. |
| Total Output Voltage Error | ±0.5% (typ) at +25°C - ensures ≤5mV absolute error at 1V output, critical for fuel gauge resolution. |
| Supply Current | 1mA (typ) per amplifier - supports low-power always-on current monitoring in battery-backed systems. |
| Bandwidth | 1.2MHz (at +100V/V) - sufficient for closed-loop battery-charger control with <800ns settling time to 1%. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial embedded applications. |
| Output Drive Capability | 2mA into ground-referenced load - directly interfaces with ADC inputs or comparator thresholds without buffering. |
Pinout & Package
The MAX4377HEUA is housed in an 8-pin µMAX® package (package code U8+1), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal performance. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Buffered voltage output proportional to (RS+ − RS−); drives up to 2mA with <5Ω source impedance. |
| 2 | GND | Analog ground reference for internal circuitry and output stage; must be connected to system AGND. |
| 3 | VCC | Positive supply input (+3V to +28V); powers internal amplifier and current mirror; PSR = 66–90dB. |
| 4 | RS+ | High-side power rail connection to external sense resistor; accepts 0V to +28V common-mode voltage. |
| 5 | RS− | Load-side terminal of external sense resistor; differential input with ±8V max rating and <120µA leakage. |
| 6–8 | N.C. | No internal connection; must be left floating or tied to GND per layout best practices (no routing required). |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +100V/V gain | Eliminates external gain-setting resistors and associated layout sensitivity, reducing BOM count and board area. |
| 0V to +28V common-mode range | Enables uninterrupted current sensing down to battery voltages as low as 0V - essential for accurate end-of-discharge fuel gauging. |
| ±0.5% full-scale accuracy (25°C) | Supports <1% state-of-charge resolution in smart battery packs using standard 10-bit ADCs without calibration. |
| 2mA buffered output drive | Directly drives ADC reference inputs or comparator thresholds without external op-amp buffering, simplifying signal chain. |
| 1.2MHz bandwidth at G = 100 | Meets response-time requirements for active battery-charge current limiting loops operating up to 100kHz switching frequency. |
Applications
| Battery Charger Monitoring | Fuel Gauge in Automotive ECUs |
|---|---|
|
Use Scenario: Real-time measurement of charge/discharge current in 12V/24V automotive battery chargers with isolated feedback paths. IC Role / Device Role / Timing Role: High-side current sensor providing isolated analog output to charger controller's ADC input; no ground loop interference. Use Value: Enables precise Coulomb counting and dynamic charge termination without compromising battery ground integrity or introducing offset drift at low Vbatt. |
Use Scenario: Accurate state-of-charge estimation in vehicle body control modules using lead-acid or LiFePO₄ batteries. IC Role / Device Role / Timing Role: Precision current transducer feeding microcontroller ADC; operates across full -40°C to +125°C ambient range. Use Value: Delivers ±0.5% error at 25°C and ±5% over temperature - sufficient for <3% SoC error in 100Ah battery systems with 10mΩ sense resistor. |
| Portable Medical Device Power Management | Industrial 4–20mA Loop Diagnostics |
|
Use Scenario: Monitoring battery discharge current in portable ultrasound or infusion pumps where runtime prediction impacts patient safety. IC Role / Device Role / Timing Role: High-side sense amplifier interfacing with low-power MCU ADC; powered from same battery rail. Use Value: 1mA quiescent current extends battery life; 0V–28V CMR allows operation down to 1.8V battery voltage with maintained accuracy. |
Use Scenario: Detecting open-wire or short-circuit faults in 4–20mA current-loop sensors by measuring loop supply current upstream of transmitter. IC Role / Device Role / Timing Role: High-side current monitor placed between loop power supply and field transmitter; outputs voltage proportional to loop current. Use Value: +100V/V gain produces 2V–10V output for 20mA–100mA fault currents - compatible with standard PLC analog inputs and avoids shunt heating issues. |
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 |
|---|---|---|---|
| INA240A1QDRQ1 | Bi-directional sensing capability; ±20V common-mode; 20V/V fixed gain; AEC-Q100 Grade 1. | Required for regenerative braking current monitoring; not suitable for unidirectional-only designs needing +100V/V gain. | Select when bidirectional sensing or automotive qualification beyond temperature range is mandatory. |
| MAX4080TASA+ | Single-ended output; +20V/V gain; 0.5µV/°C offset drift; 2.7V–76V supply range. | Used in wide-input industrial supplies; lacks buffered output and 2mA drive; requires external buffer for ADC interface. | Select when ultra-low offset drift or extended supply range outweighs need for integrated gain and drive strength. |
Compared with MAX4377HEUA, INA240A1QDRQ1 adds bidirectional support but reduces gain flexibility and increases cost, while MAX4080TASA+ extends supply range but sacrifices output drive and fixed +100V/V scaling - making MAX4377HEUA optimal for cost-sensitive, unidirectional automotive battery monitoring with minimal external components.
Availability
MAX4377HEUA is available at Aetrix Electronics and suitable for automotive battery management, portable medical device power monitoring, and industrial loop diagnostics requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX4377HEUA 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) is a semiconductor company specializing in precision analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.
The MAX4376/MAX4377/MAX4378 family was designed specifically for high-accuracy, high-side current sensing in space-constrained battery-powered systems - prioritizing common-mode independence, low quiescent current, and integrated gain stability.
FAQ
What is the exact gain value and tolerance of the MAX4377HEUA?
The MAX4377HEUA has a nominal gain of +100V/V with ±5.5% maximum gain error over the full -40°C to +125°C temperature range, and ±0.5% typical gain error at +25°C. This is factory-trimmed and does not require external resistors. The 'H' suffix explicitly denotes the +100V/V version within the MAX4377 family, and the MAX4377HEUA part number confirms this gain setting in its ordering code.
Can the MAX4377HEUA operate with a 2.5V supply voltage?
No, the MAX4377HEUA requires a minimum supply voltage of +3.0V as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below +3V is not guaranteed and may result in undefined output behavior or failure to meet datasheet performance specifications such as bandwidth, accuracy, or output drive capability. The MAX4377HEUA is not rated for sub-3V operation.
Does the MAX4377HEUA support bidirectional current sensing?
No, the MAX4377HEUA is a unidirectional high-side current-sense amplifier. Its output voltage is proportional only to the magnitude of (RS+ − RS−) when RS+ > RS−. It does not produce negative output for reverse current flow and lacks internal circuitry for polarity detection. For bidirectional applications, the MAX4377 dual variant (e.g., MAX4377HAUA+) or dedicated bidirectional amplifiers like the INA240 are required.
What is the maximum capacitive load the MAX4377HEUA output can drive without oscillation?
The MAX4377HEUA output is stable with up to 1000pF of capacitive load, as confirmed in the Electrical Characteristics table under "Maximum Capacitive Load". Driving larger capacitances may cause sustained oscillation or degraded transient response. For loads exceeding 1000pF, an external series resistor (e.g., 10–50Ω) should be added close to the output pin to maintain stability while preserving signal integrity.
Is the MAX4377HEUA RoHS-compliant and lead-free?
Yes, the MAX4377HEUA is RoHS-compliant and lead-free, indicated by the '+' suffix in its package code (U8+1) and explicitly noted in the Ordering Information section of the datasheet. The device meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering at +260°C peak temperature, consistent with standard lead-free assembly processes.
MAX4377HEUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- 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-µMAX
MAX4377HEUA FAQ
1.How can I place an order for MAX4377HEUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377HEUA 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 MAX4377HEUA reliable?
The price and inventory of MAX4377HEUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377HEUA is usually 5 days.
3.What payment methods are accepted for MAX4377HEUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377HEUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377HEUA?
MAX4377HEUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377HEUA 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 MAX4377HEUA?
For technical support, including MAX4377HEUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377HEUA requirements.
6.How does Aetrix verify that MAX4377HEUA is sourced from the original manufacturer or authorized distributors?
All MAX4377HEUA 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 MAX4377HEUA meets industry standards.
7.What is the process for return or replacement of MAX4377HEUA?
All MAX4377HEUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377HEUA, 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 MAX4377HEUA part is unused and in its original packaging.
Return procedure for MAX4377HEUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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