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Analog Devices Inc./Maxim Integrated MAX44280AYT+
- Part No.:
- MAX44280AYT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-UFLGA
- Datasheet:
-
MAX44280AYT+.pdf
- Description:
- DECOMPENSATED VERSION OF MAX4426
- Quantity:
- Payment:
- Shipping:
Inventory:4,536
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Product details
Overview
MAX44280AYT+ from Maxim Integrated is a precision rail-to-rail input/output operational amplifier optimized for low-voltage, high-speed signal conditioning in battery-powered systems. It delivers 50MHz gain-bandwidth, <50µV max input offset voltage at +25°C, 12.7nV/√Hz input voltage-noise density, and operates from 1.8V to 5.5V supply across –40°C to +125°C - enabling high-fidelity ADC buffering in portable medical instruments and 3G/4G handsets.
For engineers reviewing the MAX44280AYT+ datasheet, MAX44280AYT+ pinout, MAX44280AYT+ application, or MAX44280AYT+ equivalent, key selection criteria include its ultra-low 750µA quiescent current, absence of input crossover distortion due to integrated charge-pump architecture, shutdown current <1µA, and compatibility with 12- to 16-bit SAR ADCs such as the MAX11645.
Technical Context
The MAX44280AYT+ employs a proprietary BiCMOS process with an internal ultra-quiet charge pump that generates a +1V rail above VDD to bias a pMOS input stage - eliminating crossover distortion while maintaining rail-to-rail common-mode input range (–0.1V to VDD + 0.1V) and output swing (within 50mV of rails at 600Ω load). This architecture enables stable operation at minimum gain of 5V/V without external compensation.
It integrates power-up autotrim (10ms self-calibration to <50µV VOS), active-low shutdown with 15µs turn-on time, and robust capacitive-load drive capability (up to 80pF at AV = 5V/V). Its PSRR (82–95dB) and CMRR (75–90dB) remain stable over temperature and frequency, supporting precision DC-coupled signal paths in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 50MHz - supports stable closed-loop gain ≥5V/V up to 10MHz signal bandwidth for anti-aliasing filter design. |
| Input Offset Voltage (max) | 500µV over –40°C to +125°C - ensures <0.005% full-scale error in 12-bit ADC buffer applications. |
| Input Voltage-Noise Density | 12.7nV/√Hz at 10kHz - preserves SNR in low-amplitude sensor signal amplification before 16-bit ADCs. |
| Quiescent Current | 750µA per amplifier - enables always-on signal monitoring in energy-constrained IoT nodes. |
| Shutdown Supply Current | <1µA - reduces system standby power by >99.9% when idle, critical for multi-day battery life. |
| Rail-to-Rail I/O Swing | VOL ≤50mV above VSS, VOH ≤50mV below VDD at 600Ω - maximizes dynamic range in single-supply 1.8V systems. |
| Input Bias Current | 100pA max over –40°C to +125°C - minimizes voltage error with high-impedance photodiode or pH sensor sources. |
Pinout & Package
MAX44280AYT+ is housed in a 1mm × 1.5mm ultra-thin µDFN (Ultra-Thin LGA) package with wettable flanks, RoHS-compliant and lead-free. The package features a thermal pad on the bottom for enhanced heat dissipation (θJA = 470°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN+ | Noninverting Input | CMOS input with 0.4pF capacitance; accepts signals from –0.1V to VDD + 0.1V - enables true rail-to-rail differential sensing. |
| 2 VSS | Negative Power Supply | Ground reference; requires 0.1µF bypass capacitor to minimize noise coupling into sensitive analog front-end. |
| 3 IN− | Inverting Input | Differential pair node; matched to IN+ for <50µV offset; low 1.2fA/√Hz current noise supports transimpedance designs. |
| 4 OUT | Amplifier Output | Capable of sourcing/sinking 85mA; drives 32Ω loads with <800mV headroom - suitable for direct connection to ADC input RC filters. |
| 5 SHDN | Active-Low Shutdown Control | Logic-compatible with 1.8V/3.3V microcontrollers; independent of VDD - allows host MCU to disable amplifier without supply reconfiguration. |
| 6 VDD | Positive Power Supply | Accepts 1.8V–5.5V; internal regulation ensures stable performance across battery discharge curve in portable devices. |
Key Features
| Feature | Design Value |
|---|---|
| Charge-Pump Input Stage | Eliminates crossover distortion in noninverting configurations (e.g., Sallen-Key filters), enabling clean 0–VDD signal handling without dead zones. |
| Power-Up Autotrim | Self-calibrates input offset to <50µV within 10ms at power-on - removes need for external trimming or software calibration in field-deployed equipment. |
| Rail-to-Rail Output Drive | Delivers 85mA short-circuit current while maintaining <50mV saturation voltage - supports driving 50Ω coaxial lines or multiplexed ADC inputs directly. |
| Low 1.2fA/√Hz Input Current Noise | Enables high-gain transimpedance amplification of picoamp-level photodiode currents with minimal added noise floor degradation. |
| Stable at AV ≥ 5V/V | Internally compensated - no external compensation required, reducing BOM count and PCB area in space-constrained wearables. |
Applications
| Portable Medical Instrumentation | High-Resolution SAR ADC Buffering |
|---|---|
|
Use Scenario: Amplifying low-amplitude ECG or EEG sensor outputs in handheld diagnostic devices powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Precision DC-coupled buffer with rail-to-rail I/O, autotrimmed offset, and low 12.7nV/√Hz noise to preserve microvolt-level biopotential signals. Use Value: Enables 16-bit effective resolution with MAX11645 ADC without external offset correction, extending battery life via 750µA quiescent current. |
Use Scenario: Driving the analog input of 12–16-bit successive-approximation ADCs in data loggers requiring low THD and fast settling. IC Role / Device Role / Timing Role: Low-distortion (–110dB THD), 0.6µs settling-to-0.01% driver with 50MHz GBW and 30V/µs slew rate for accurate sampling. Use Value: Maintains linearity across full 1.8V supply range and –40°C to +125°C, eliminating gain/offset drift-induced measurement errors. |
| 3G/4G Handset Front-End | Transimpedance Amplifier for Photodiodes |
|
Use Scenario: Conditioning RF envelope detection or audio codec line-level signals in compact smartphone form factors. IC Role / Device Role / Timing Role: Low-power, small-footprint (1mm × 1.5mm µDFN) op amp with shutdown mode (<1µA) for dynamic power gating during sleep cycles. Use Value: Reduces system standby power while retaining fast 15µs wake-up response - critical for LTE modem coexistence timing budgets. |
Use Scenario: Converting nanoampere photocurrents from ambient light or pulse oximetry sensors into precise voltage outputs. IC Role / Device Role / Timing Role: Ultra-low input bias current (100pA max) and 1.2fA/√Hz current noise minimize Johnson-Nyquist and shot noise contributions. Use Value: Achieves sub-1% gain error with GΩ-range feedback resistors, enabling accurate optical intensity measurement down to 10nA photocurrent. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision, low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Lower offset drift (0.1µV/°C vs. 0.8–5µV/°C), but only 350kHz GBW and 1.8V min supply limited to 0°C to +70°C. | Better for ultra-stable DC instrumentation; unsuitable for >100kHz filtering or wide-temp industrial use. | Select OPA333AIDBVR only when sub-µV/°C drift dominates over speed and temperature range requirements. |
| ADA4522-1ARMZ | Zero-drift architecture with 2.5µV max VOS and 3MHz GBW; consumes 1.2mA vs. 750µA; requires external compensation above unity gain. | Superior DC accuracy for weigh scales; higher power and lower bandwidth limit use in ADC drivers above 100ksps. | Choose ADA4522-1ARMZ when long-term VOS stability outweighs power and speed constraints in precision sensor interfaces. |
Compared with OPA333AIDBVR and ADA4522-1ARMZ, the MAX44280AYT+ uniquely balances 50MHz bandwidth, <50µV VOS, 750µA quiescent current, and –40°C to +125°C operation - making it the only option capable of driving 16-bit SAR ADCs in thermally demanding, battery-powered edge devices without trade-offs in speed, accuracy, or efficiency.
Availability
MAX44280AYT+ is available at Aetrix Electronics and suitable for portable medical instrumentation, 3G/4G handset front-ends, and high-resolution SAR ADC buffering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX44280AYT+ 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 high-performance analog and mixed-signal ICs for power, sensing, connectivity, and signal processing in demanding environments.
The MAX44280AYT+ belongs to Maxim's precision, low-power op amp product line - engineered specifically for signal integrity in space-constrained, battery-operated systems where rail-to-rail operation, low noise, and wide temperature performance are non-negotiable.
FAQ
What is the maximum operating temperature range for the MAX44280AYT+?
The MAX44280AYT+ is fully specified and guaranteed over –40°C to +125°C. It maintains all electrical parameters including input offset voltage (≤500µV), CMRR (≥75dB), and PSRR (≥82dB) across this full industrial temperature range - unlike many competing op amps rated only to +85°C or +105°C.
Does the MAX44280AYT+ require external compensation for unity-gain stability?
No, the MAX44280AYT+ is internally compensated for gains of 5V/V or greater. It is not unity-gain stable; attempting unity-gain configuration may cause oscillation. For gains below 5V/V, external compensation is required - refer to Figure 26 and Figure 27 in the datasheet for stability guidelines with capacitive loads.
How does the charge-pump architecture in the MAX44280AYT+ eliminate crossover distortion?
The MAX44280AYT+ integrates an ultra-quiet charge pump that generates a +1V rail above VDD to power a pMOS input differential pair. This eliminates the dead zone inherent in conventional CMOS input stages where nMOS and pMOS transistors switch dominance near mid-supply - resulting in zero measurable crossover distortion even in noninverting configurations like Sallen-Key filters.
Can the MAX44280AYT+ drive a 50Ω transmission line directly?
Yes - the MAX44280AYT+ can source/sink up to 85mA and maintains rail-to-rail output swing even under 32Ω load (VOL ≤400mV, VOH ≤800mV). When driving a 50Ω line, it delivers full-scale output with <1% gain error and preserves 0.6µs settling time, making it suitable for direct interface to high-speed ADC inputs or RF envelope detectors.
What is the shutdown behavior of the MAX44280AYT+ regarding input/output states?
When SHDN is pulled low, the MAX44280AYT+ places both inputs and output into high-impedance state, draws <1µA supply current, and retains its power-up autotrim offset setting. Outputs do not float - they are actively tri-stated, allowing safe multiplexing of multiple MAX44280AYT+ outputs onto a shared bus without external isolation components.
MAX44280AYT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-UFLGA
- Packaging:
- Strip
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 30V/µs
- Gain Bandwidth Product:
- 50 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.01 pA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 750µA
- Current - Output / Channel:
- 85 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UTLGA (1.5x1.0)
MAX44280AYT+ FAQ
1.How can I place an order for MAX44280AYT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX44280AYT+ 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 MAX44280AYT+ reliable?
The price and inventory of MAX44280AYT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX44280AYT+ is usually 5 days.
3.What payment methods are accepted for MAX44280AYT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX44280AYT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX44280AYT+?
MAX44280AYT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX44280AYT+ 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 MAX44280AYT+?
For technical support, including MAX44280AYT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX44280AYT+ requirements.
6.How does Aetrix verify that MAX44280AYT+ is sourced from the original manufacturer or authorized distributors?
All MAX44280AYT+ 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 MAX44280AYT+ meets industry standards.
7.What is the process for return or replacement of MAX44280AYT+?
All MAX44280AYT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX44280AYT+, 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 MAX44280AYT+ part is unused and in its original packaging.
Return procedure for MAX44280AYT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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