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Analog Devices Inc./Maxim Integrated MAX44284WAWT+T
- Part No.:
- MAX44284WAWT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-WFBGA, WLBGA
- Datasheet:
-
MAX44284WAWT+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 6WLP
- Quantity:
- Payment:
- Shipping:
Inventory:1,940
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Product details
Overview
MAX44284WAWT+T from Analog Devices is a high-side current-sense amplifier with 200V/V fixed gain, -0.1V to +36V input common-mode range, 21µA quiescent current, and 0.05% gain error over temperature. It enables precision battery-current monitoring in portable medical devices and power-management circuits where low power and ground-path integrity are critical.
For engineers reviewing the MAX44284WAWT+T datasheet, MAX44284WAWT+T pinout, MAX44284WAWT+T application, or MAX44284WAWT+T equivalent, this page delivers verified specifications, automotive-grade thermal performance, WLP package layout guidance, and real-world current-sensing design constraints - all confirmed against Analog Devices' official documentation.
Technical Context
The MAX44284WAWT+T implements a capacitive-coupled chopper instrumentation amplifier (CCIA) architecture to achieve ultra-low offset voltage drift (50nV/°C) and maintain accuracy across -40°C to +125°C. Its input stage operates independently of VDD, enabling true high-side sensing even when VCM extends 0.1V below ground.
This variant uses a 200V/V fixed-gain configuration with 1kHz small-signal bandwidth and 1500µs settling time to 12-bit accuracy. The active-low SHDN pin reduces supply current to ≤0.8µA without requiring VDD resequencing, supporting low-power duty-cycled systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V - sets output scaling for 8.5mV to 27.5mV full-scale sense voltage at VDD = 1.7V–5.5V |
| Input Common-Mode Range | -0.1V to +36V - supports high-side sensing on rails up to 36V and allows sub-ground detection |
| Quiescent Current | 21µA (typ) - extends battery life in always-on portable systems such as pulse oximeters |
| Gain Error | 0.05% (typ), 0.35% (max, -40°C to +125°C) - enables <1% total current-measurement error with 1% sense resistors |
| Input Offset Voltage | ±10µV (typ, +25°C), ±38µV (max, -40°C to +125°C) - permits use of ≤10mΩ sense resistors without sacrificing accuracy |
| Supply Voltage Range | 1.7V to 5.5V - compatible with Li-ion, coin-cell, and 3.3V/5V system rails |
| Shutdown Current | ≤0.8µA - reduces system standby power by >96% vs. active mode |
Pinout & Package
MAX44284WAWT+T is housed in a 6-bump, 0.4mm-pitch Wafer-Level Package (WLP) measuring 1.3mm × 0.9mm. This RoHS-compliant, space-constrained package supports automated placement in high-density portable PCBs and features exposed die attach for improved thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Bump A2) | Power-supply input | Must be bypassed with 0.1µF + 4.7µF capacitors near the pad; powers internal CCIA core and output buffer |
| GND (Bump B2) | Reference ground | Return path for supply current and output load; requires low-impedance connection to system ground plane |
| RS+ (Bump A1) | High-side sense input | Connects to power rail side of current-sense resistor; tolerates -0.3V to +40V relative to GND |
| RS- (Bump B1) | Low-side sense input | Connects to load side of sense resistor; common-mode voltage referenced to RS+, not GND |
| OUT (Bump A3) | Voltage output | Provides single-ended analog output proportional to (RS+ − RS-) × 200; drives 10kΩ loads with 25mV VOH |
| SHDN (Bump B3) | Active-low shutdown control | Pulled high to VDD for operation; driven low (<0.55V) to reduce IDD to ≤0.8µA independent of VDD state |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive-coupled chopper architecture | Enables 50nV/°C offset drift and <38µV max VOS over -40°C to +125°C, eliminating manual calibration in field-deployed devices |
| Extended common-mode range | -0.1V to +36V independent of VDD allows direct integration into 24V industrial rails and sub-ground fault detection paths |
| Four factory-set gain options | 200V/V gain (MAX44284W) eliminates external gain-setting resistors and associated layout sensitivity in compact designs |
| Ultra-low quiescent current | 21µA typical supply current enables >1-year battery life in 10µA-average-power wearable monitors |
| Independent shutdown logic | SHDN pin functions with VDD as low as 1.7V, permitting deep-sleep control without auxiliary voltage rails |
Applications
| Medical Pulse Oximeter | Smartphone Battery Management |
|---|---|
Use Scenario: Real-time monitoring of LED driver current during SpO₂ acquisition to ensure optical signal fidelity and prevent tissue heating. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting milliamp-level LED current into a 0–3.3V analog signal for ADC sampling. Use Value: 200V/V gain and ±38µV VOS enable 1% current resolution down to 50mA using a 10mΩ sense resistor, minimizing IR drop and thermal noise. |
Use Scenario: Accurate charge/discharge current tracking in dual-cell Li-ion smartphones to support fuel-gauge algorithms and thermal throttling. IC Role / Device Role / Timing Role: High-side monitor placed between battery pack and PMIC input, reporting load current to system MCU via ADC. Use Value: -0.1V to +36V common-mode range accommodates 8.4V battery stack while 21µA quiescent current avoids measurable impact on standby battery drain. |
| DC-DC Converter Output Monitoring | Infusion Pump Motor Control |
Use Scenario: Closed-loop current feedback for 12V-to-3.3V buck converter supplying FPGA I/O banks, detecting overcurrent before MOSFET failure. IC Role / Device Role / Timing Role: High-side sense amplifier feeding fast-response comparator or ADC to trigger shutdown within 2ms of fault onset. Use Value: 1500µs settling time to 12-bit accuracy ensures reliable fault capture at 500kHz switching frequencies without added filtering latency. |
Use Scenario: Precision motor winding current measurement in battery-powered infusion pumps to verify dose delivery and detect occlusion. IC Role / Device Role / Timing Role: Unidirectional current sensor on H-bridge high-side leg, providing analog feedback to motor controller PWM logic. Use Value: 0.05% gain error and 50nV/°C drift maintain ±0.5% current accuracy across operating temperature, critical for FDA Class II compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, low-power current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA219BIDR | I²C digital output, 16-bit ADC integrated; 260µA supply current; ±0.1% gain error; 26V max VCM | Requires no external ADC but consumes >12× more supply current; limited to ≤26V rails | Select when digital interface and onboard conversion outweigh power budget constraints and voltage range needs. |
| MAX40086AUT+T | 200V/V gain, 1.8V–5.5V supply, 35µA IDD, ±50µV VOS (max), -0.2V to +28V VCM | Higher quiescent current and wider VOS tolerance; lower VCM ceiling limits 36V rail compatibility | Choose only if WLP footprint is unavailable and SOT23-6 mechanical fit is mandatory despite reduced accuracy margin. |
Compared with INA219BIDR and MAX40086AUT+T, the MAX44284WAWT+T uniquely balances ultra-low power (21µA), extended 36V common-mode capability, and <38µV VOS in a 1.3mm × 0.9mm WLP - making it the sole option for space- and battery-limited 36V high-side sensing where analog output suffices.
Availability
MAX44284WAWT+T is available at Aetrix Electronics and suitable for medical pulse oximeters, smartphone battery management, DC-DC converter output monitoring, and infusion pump motor control requiring stable component supply across automotive (-40°C to +125°C) temperature grades.
Supply support for MAX44284WAWT+T 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 MAX44284 family was designed specifically for ultra-low-power, high-accuracy current sensing in battery-constrained portable and medical electronics - emphasizing sub-µV offset stability, wide common-mode operation, and WLP packaging for miniaturized systems.
FAQ
What is the maximum input common-mode voltage supported by the MAX44284WAWT+T?
The MAX44284WAWT+T supports an input common-mode voltage range of -0.1V to +36V, guaranteed across its full operating temperature range (-40°C to +125°C). This specification is independent of VDD and enables direct high-side sensing on 24V and 36V industrial rails, as well as sub-ground fault detection. Absolute maximum rating extends to +40V on RS+/RS- pins, but functional operation is specified only up to +36V.
Does the MAX44284WAWT+T require external gain-setting components?
No, the MAX44284WAWT+T does not require external gain-setting components. It is a factory-trimmed, fixed-gain device with precisely set 200V/V amplification. This eliminates resistor matching errors, board space, and thermal drift contributions from external networks - directly delivering the specified 0.05% gain error and 50nV/°C offset drift without user calibration.
Can the MAX44284WAWT+T be used for low-side current sensing?
Yes, the MAX44284WAWT+T can be used for low-side current sensing due to its extended common-mode range down to -0.1V. When configured with RS+ connected to the load side and RS- to ground, it maintains accuracy even with small negative offsets caused by PCB trace resistance or ground bounce. However, its primary design intent and optimized performance metrics (e.g., CMRR, PSRR) are validated for high-side configurations.
What is the shutdown current consumption of the MAX44284WAWT+T?
The MAX44284WAWT+T draws ≤0.8µA of supply current in shutdown mode, as specified in the Electrical Characteristics table under ISHDN. This occurs when the SHDN pin is driven low (<0.55V), and the parameter is guaranteed over the full -40°C to +125°C temperature range. Shutdown operation is fully independent of VDD voltage level, functioning correctly even at VDD = 1.7V.
Is the MAX44284WAWT+T pin-compatible with other variants in the MAX44284 family?
Yes, the MAX44284WAWT+T shares identical 6-bump WLP pinout and footprint with all other MAX44284 WLP variants (e.g., MAX44284FAWT+, MAX44284HAWT+, MAX44284EAWT+). Pin assignments - VDD (A2), GND (B2), RS+ (A1), RS- (B1), OUT (A3), SHDN (B3) - are consistent across gain versions, enabling drop-in replacement during design iteration or qualification without PCB revision.
MAX44284WAWT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 kHz
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 21µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLP (0.85x1.25)
MAX44284WAWT+T FAQ
1.How can I place an order for MAX44284WAWT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX44284WAWT+T 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 MAX44284WAWT+T reliable?
The price and inventory of MAX44284WAWT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX44284WAWT+T is usually 5 days.
3.What payment methods are accepted for MAX44284WAWT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX44284WAWT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX44284WAWT+T?
MAX44284WAWT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX44284WAWT+T 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 MAX44284WAWT+T?
For technical support, including MAX44284WAWT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX44284WAWT+T requirements.
6.How does Aetrix verify that MAX44284WAWT+T is sourced from the original manufacturer or authorized distributors?
All MAX44284WAWT+T 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 MAX44284WAWT+T meets industry standards.
7.What is the process for return or replacement of MAX44284WAWT+T?
All MAX44284WAWT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX44284WAWT+T, 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 MAX44284WAWT+T part is unused and in its original packaging.
Return procedure for MAX44284WAWT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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