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Analog Devices Inc./Maxim Integrated MAX4378HASD+
- Part No.:
- MAX4378HASD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4378HASD+.pdf
- Description:
- IC CURR SENSE 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:160
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Product details
Overview
MAX4378HASD+ from Maxim Integrated is a quad-channel, high-side current-sense amplifier with fixed +100V/V gain, 0–28V input common-mode range independent of supply voltage, ±0.5% typical full-scale accuracy at +25°C, 1.2MHz bandwidth (gain = +100V/V), and automotive-grade operation from –40°C to +125°C. It enables precise battery-current monitoring in notebook computers, smart battery packs, and automotive power management systems without disrupting ground paths.
For engineers reviewing the MAX4378HASD+ datasheet, MAX4378HASD+ pinout, MAX4378HASD+ application, or MAX4378HASD+ equivalent, key selection criteria include its fixed +100V/V gain, buffered 2mA-output voltage interface, 1mA per-amplifier supply current, 14-pin SOIC package, and AEC-Q100-qualified performance for high-reliability current sensing in battery-charger control loops and board-level power monitoring.
Technical Context
The MAX4378HASD+ implements a precision high-side sensing architecture using internal current-mirror gain stages and buffered output drivers. Its input common-mode range (0 to +28V) remains fully functional even when VRS+ drops below 2V - critical for deep-discharge battery monitoring - and is decoupled from VCC (3V to 28V).
Each of the four amplifiers delivers a voltage output proportional to ILOAD × RSENSE × 100, with total output error as low as ±0.5% at +25°C and ±5.5% over full temperature range. The device supports up to 1000pF capacitive load and achieves 1µs saturation recovery time, enabling stable integration into fast-switching power-control feedback paths.
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 loss of functionality. |
| Full-Scale Sense Voltage | 150mV - defines maximum differential input before clipping; determines minimum RSENSE for target current range. |
| Supply Voltage Range | +3V to +28V - supports wide-input industrial and automotive power rails without external regulation. |
| Bandwidth | 1.2MHz at +100V/V - sufficient for closed-loop response inside battery-charger control circuits. |
| Supply Current per Amplifier | 1mA (typ) - enables low-power system monitoring across all four channels with minimal overhead. |
| 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
MAX4378HASD+ is housed in a 14-pin SOIC package (package code S14+1, outline 21-0041), RoHS-compliant, with standard 1.27mm pitch and JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | OUT1, OUT2, OUT3, OUT4 | Buffered voltage outputs proportional to sensed current; each drives up to 2mA into ground-referenced loads. |
| 2, 6, 9, 13 | RS1–, RS2–, RS3–, RS4– | Load-side terminals of external sense resistors; referenced to respective amplifier inverting inputs. |
| 3, 5, 10, 12 | RS1+, RS2+, RS3+, RS4+ | Power-rail side terminals of external sense resistors; tolerate 0–28V common-mode voltage. |
| 4 | GND | Analog ground reference for all four amplifiers; must be connected to system ground plane for accuracy. |
| 11 | VCC | Single supply rail for all four amplifiers; powers internal bias, mirror, and output buffer stages. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +100V/V gain | Eliminates external gain-setting resistors and associated layout sensitivity; ensures repeatable scaling across production units. |
| ±0.5% full-scale accuracy at +25°C | Enables high-precision fuel gauging and current-limiting decisions without calibration in most portable systems. |
| 0V to +28V common-mode range | Supports uninterrupted current sensing down to battery voltages near 0V - essential for accurate end-of-discharge detection. |
| Buffered 2mA output drive | Directly drives 12-bit ADC inputs (e.g., 1kΩ input impedance) with <1 LSB error; avoids signal degradation from external buffers. |
| AEC-Q100 qualification | Validated for automotive applications including battery management modules and body control units requiring extended reliability. |
| 1.2MHz bandwidth at +100V/V | Meets timing requirements for real-time current feedback in switching charger controllers operating up to ~200kHz. |
Applications
| Smart Battery Fuel Gauging | Battery Charger Current Control |
|---|---|
|
Use Scenario: Monitoring bidirectional charge/discharge current in laptop smart battery packs to compute state-of-charge (SoC) and remaining runtime. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated, ground-independent analog voltage output proportional to battery current polarity and magnitude. Use Value: Enables accurate SoC estimation across full battery voltage range (0–18V), including deep discharge, due to 0V–28V common-mode tolerance and ±0.5% gain accuracy. |
Use Scenario: Providing real-time current feedback to PWM controller in constant-current/constant-voltage (CC/CV) battery chargers for Li-ion cells. IC Role / Device Role / Timing Role: Quad-channel analog front-end delivering synchronized, low-latency current measurements to charger IC's error amplifier or digital controller. Use Value: 1.2MHz bandwidth and 1µs saturation recovery ensure stable loop response during transient load steps; buffered outputs reduce noise coupling into sensitive control circuitry. |
| Automotive Body Control Module (BCM) | Industrial Board-Level Power Monitoring |
|
Use Scenario: Detecting overcurrent conditions in 12V/24V automotive subsystems such as lighting, HVAC actuators, and infotainment power rails. IC Role / Device Role / Timing Role: High-side current monitor integrated into power distribution unit (PDU) for fault detection and load profiling. Use Value: AEC-Q100 qualification and –40°C to +125°C operation guarantee reliability in under-hood environments; quad configuration supports multi-rail monitoring on single PCB area. |
Use Scenario: Measuring real-time current draw across multiple DC/DC converter outputs on server or telecom power supply boards. IC Role / Device Role / Timing Role: Precision analog sensor converting milliohm-shunt voltage drops into scalable, noise-immune voltage signals for system health monitoring. Use Value: 1mA per channel supply current minimizes self-heating impact on measurement stability; 2mA output drive allows direct routing to remote ADCs without level-shifting components. |
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 |
|---|---|---|---|
| INA226AIDGST | I²C digital output, 16-bit resolution, 0.1% gain error, 10µA quiescent current, 500kHz bandwidth. | Requires microcontroller interface and firmware support; lacks analog immediacy for analog control loops. | Preferred when digital telemetry, programmable gain, or multi-device bus topology is required over analog simplicity. |
| MAX4080TASA+ | Single-channel, +20V/V gain, 2.5MHz bandwidth, same SO-8 package, 1.2mA supply current. | Limited to single-sensing point; lower gain reduces dynamic range for low-current applications. | Selected when space-constrained designs need only one high-bandwidth channel and can accept reduced gain flexibility. |
Compared with MAX4378HASD+, the INA226AIDGST trades analog immediacy for digital configurability and higher resolution, while the MAX4080TASA+ offers higher bandwidth but sacrifices channel count and gain - making MAX4378HASD+ optimal for compact, multi-rail analog current monitoring where fixed +100V/V scaling and automotive qualification are mandatory.
Availability
MAX4378HASD+ is available at Aetrix Electronics and suitable for notebook computer power management, automotive BCM current detection, and industrial board-level power monitoring requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for MAX4378HASD+ 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-common-mode, high-side current sensing in battery-powered and automotive systems where ground-path integrity and wide input voltage tolerance are critical.
FAQ
What is the gain setting of MAX4378HASD+ and how is it implemented?
The MAX4378HASD+ has a fixed +100V/V gain, indicated by the "H" suffix in its part number. This gain is implemented via internal laser-trimmed resistor networks and current-mirror architecture - no external gain-setting components are required. The gain remains stable across temperature (±0.5% at +25°C, ±5.5% over –40°C to +125°C) and supply voltage variations, ensuring consistent scaling of sensed current to output voltage in the MAX4378HASD+.
Does MAX4378HASD+ support bidirectional current sensing?
No, the MAX4378HASD+ is a unidirectional high-side current-sense amplifier optimized for monitoring current flow from supply to load. Its output voltage increases linearly with increasing load current but does not reverse polarity for reverse current. For bidirectional applications like smart battery fuel gauging, the MAX4377HAUA+ (dual-channel variant) is recommended - the MAX4378HASD+ itself does not provide negative output swing or polarity inversion capability.
What is the absolute maximum common-mode voltage rating for MAX4378HASD+?
The MAX4378HASD+ has an absolute maximum common-mode input voltage rating of +30V on RS+ and RS– pins, with operational functionality guaranteed from 0V to +28V. This specification is independent of VCC and allows reliable operation even when the sensed rail exceeds the device's supply voltage - a key requirement for battery anode monitoring in deeply discharged states. Exceeding +30V risks permanent damage per the MAX4378HASD+ absolute maximum ratings table.
Can MAX4378HASD+ drive a 10kΩ ADC input directly?
Yes, the MAX4378HASD+ buffered output can drive a 10kΩ ADC input directly. With a 2mA output drive capability and typical output resistance of 5Ω, the voltage drop across 10kΩ is negligible (<0.05% loading error). The output remains within 1% of ideal scaling across full temperature and supply ranges, making the MAX4378HASD+ compatible with standard SAR and delta-sigma ADCs without external op-amp buffering.
Is MAX4378HASD+ qualified for automotive applications?
Yes, the MAX4378HASD+ is AEC-Q100 qualified for automotive applications. It operates over the full automotive temperature range of –40°C to +125°C and meets stress-test requirements for humidity, thermal cycling, and ESD robustness. This qualification is explicitly documented in Maxim's ordering information and datasheet revision history, confirming suitability for use in battery management systems, body control modules, and other automotive electronics where reliability under harsh environmental conditions is mandatory.
MAX4378HASD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 120 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 1mA (x4 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:
- 14-SOIC
MAX4378HASD+ FAQ
1.How can I place an order for MAX4378HASD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4378HASD+ 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 MAX4378HASD+ reliable?
The price and inventory of MAX4378HASD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4378HASD+ is usually 5 days.
3.What payment methods are accepted for MAX4378HASD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4378HASD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4378HASD+?
MAX4378HASD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4378HASD+ 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 MAX4378HASD+?
For technical support, including MAX4378HASD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4378HASD+ requirements.
6.How does Aetrix verify that MAX4378HASD+ is sourced from the original manufacturer or authorized distributors?
All MAX4378HASD+ 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 MAX4378HASD+ meets industry standards.
7.What is the process for return or replacement of MAX4378HASD+?
All MAX4378HASD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4378HASD+, 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 MAX4378HASD+ part is unused and in its original packaging.
Return procedure for MAX4378HASD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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