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Analog Devices Inc./Maxim Integrated MAX4231AUT
- Part No.:
- MAX4231AUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4231AUT.pdf
- Description:
- IC CMOS 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:699
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Product details
Overview
The MAX4231AUT from Maxim Integrated is a single, high-output-drive, rail-to-rail input/output CMOS operational amplifier with integrated shutdown control, operating from 2.7V to 5.5V. It delivers 30mA output drive, 10MHz gain-bandwidth product, 10V/µs slew rate, and achieves rail-to-rail swing into 32Ω loads-enabling direct biasing of RF power amplifiers in wireless handsets and driving portable headphone speakers.
For engineers reviewing the MAX4231AUT datasheet, MAX4231AUT pinout, MAX4231AUT application, or MAX4231AUT equivalent, this page provides verified specifications, SC70-6 pin mapping, shutdown timing (1µs enable/disable), thermal performance across -40°C to +125°C, and real-world design context for PA biasing and audio driver circuits.
Technical Context
The MAX4231AUT employs parallel n-channel and p-channel differential input stages to achieve true rail-to-rail common-mode input range (VSS to VDD), with each stage active in complementary voltage regions. Its output stage supports rail-to-rail swing under load, delivering ≤500mV from rails at 32Ω with 2.7V supply.
Shutdown functionality actively drives the output low (≤120mV at 200Ω) when SHDN is pulled low, reducing quiescent current to <1µA per amplifier. The device maintains unity-gain stability with capacitive loads up to 780pF and exhibits no phase reversal on overdriven inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 5.5V single supply - enables direct integration into battery-powered 3.3V/5V systems without level-shifting. |
| Gain-Bandwidth Product | 10MHz - supports stable closed-loop operation up to ~1MHz at gain ≥10, suitable for audio and RF bias control loops. |
| Slew Rate | 10V/µs - ensures faithful reproduction of fast transients in headset drivers and PA bias waveforms. |
| Output Drive | 30mA continuous - sufficient to bias typical RF PAs and drive 32Ω headphones at line-level signal integrity. |
| Input Offset Voltage | ±6mV max - minimizes DC error in precision biasing applications where offset-induced PA quiescent current drift must be controlled. |
| Shutdown Current | <1µA at 2.7V - enables ultra-low-power state in portable devices during sleep or transmit-off intervals. |
| PSRR | 85dB typical - rejects supply noise critical in noisy RF sections, preserving signal fidelity in shared power domains. |
Pinout & Package
The MAX4231AUT is packaged in a 6-pin SOT23 (U6SN-1) with 1.6mm × 2.9mm footprint and 1.1mm height, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN+) | Noninverting Input | Differential input node accepting rail-to-rail common-mode signals; high-impedance (1000MΩ) CMOS input. |
| 2 (IN−) | Inverting Input | Differential input node; used with IN+ to configure gain, feedback, and signal polarity in standard op-amp topologies. |
| 3 (OUT) | Amplifier Output | High-current, rail-to-rail output capable of sourcing/sinking 30mA; actively pulled low during shutdown. |
| 4 (SHDN) | Shutdown Control | CMOS-compatible digital input; logic low (≤0.8V) disables amplifier and forces OUT to VSS; VIH ≥0.57×VDD. |
| 5 (VDD) | Positive Supply | Primary power rail connection; must be bypassed with 0.1µF ceramic capacitor near the pin for stability. |
| 6 (VSS) | Negative Supply / Ground | Reference node for single-supply operation; exposed pad (if present) connects to ground for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail I/O | Input common-mode range extends from VSS to VDD; output swings within 500mV of both rails into 32Ω - eliminates need for dual supplies in portable audio/PA bias. |
| Shutdown Mode | Reduces supply current to <1µA while actively pulling output to VSS - prevents RF leakage and ensures clean disable of connected PA stages. |
| Capacitive Load Stability | Stable with up to 780pF load capacitance without external compensation - simplifies layout for PCB traces and filter networks. |
| No Phase Reversal | Maintains correct polarity even when inputs exceed common-mode range - avoids catastrophic latch-up or signal inversion in transient conditions. |
| Low Input Bias Current | 50pA typical - preserves accuracy in high-impedance sensor interfaces and precision reference buffering. |
Applications
| RF Power Amplifier Biasing | Portable Headphone Driver |
|---|---|
Use Scenario: Controlling quiescent current of GaAs or SiGe RF PAs in GSM/UMTS/WCDMA handset front-ends. IC Role / Device Role / Timing Role: Precision DC bias generator with fast transient response, driven by DAC or baseband processor. Use Value: Enables accurate, temperature-stable PA biasing across -40°C to +125°C automotive grade, minimizing EVM degradation and power consumption. | Use Scenario: Driving 32Ω stereo earpieces from a single 3.3V or 5V supply in smartphones and wearables. IC Role / Device Role / Timing Role: Single-supply, rail-to-rail output buffer delivering 60mW/channel with <1% THD+N at 1kHz. Use Value: Eliminates coupling capacitors in compact layouts; full rail-to-rail swing maximizes dynamic range without DC blocking components. |
| Audio Hands-Free Car Kit | Laptop Audio Line Driver |
Use Scenario: Amplifying microphone and speaker signals in automotive hands-free modules with strict EMC and thermal constraints. IC Role / Device Role / Timing Role: Low-noise, high-PSRR op-amp providing gain and level-shifting between analog codec and external audio accessories. Use Value: 85dB PSRR suppresses ignition noise; shutdown mode cuts system standby current, extending battery life in Bluetooth-enabled kits. | Use Scenario: Buffering DAC outputs to line-level outputs (e.g., headphone jack, internal speaker amp) in ultrabooks and 2-in-1 convertibles. IC Role / Device Role / Timing Role: High-slew-rate, low-distortion driver supporting wideband audio (20Hz–20kHz) with minimal group delay. Use Value: 10V/µs slew rate ensures flat frequency response up to 100kHz; rail-to-rail output delivers full 3.3Vpp signal into 10kΩ loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-drive, rail-to-rail op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4231AXT+T | Identical electrical specs; packaged in 6-pin SC70 (X6SN-1), 2.1mm × 2.0mm footprint vs. SOT23's 2.9mm × 1.6mm. | SC70 offers smaller area but lower thermal mass; less suitable for sustained 30mA output in high-ambient environments. | Select MAX4231AXT+T only if board area is more critical than thermal margin and peak power dissipation. |
| OPA365AIDBVR | Higher GBWP (50MHz) and slew rate (25V/µs); lower output drive (12mA); no shutdown function; 1.2mV max VOS. | Optimized for precision high-speed signal conditioning-not RF PA bias or headphone drive requiring >25mA output. | Choose OPA365AIDBVR only for low-distortion, wideband signal chain buffering where shutdown and high current are unnecessary. |
Compared with MAX4231AXT+T and OPA365AIDBVR, the MAX4231AUT uniquely balances 30mA output drive, rail-to-rail operation, sub-1µA shutdown, and automotive-grade temperature range in a thermally robust SOT23 package-making it optimal for RF bias and portable audio where current delivery and power-state control are mandatory.
Availability
The MAX4231AUT is available at Aetrix Electronics and suitable for RF power amplifier biasing, portable headphone driver circuits, and automotive hands-free audio systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4231AUT 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 communications applications.
The MAX4230–MAX4234 family was engineered specifically for high-output-drive, rail-to-rail op-amp roles in wireless infrastructure and portable audio-emphasizing shutdown control, thermal resilience, and load-driving capability in miniature packages.
FAQ
What is the maximum continuous output current specification for the MAX4231AUT?
The MAX4231AUT is rated for 30mA continuous output current per the datasheet's DC electrical characteristics table. While peak current capability reaches 200mA, sustained operation above 30mA risks exceeding absolute maximum power dissipation limits-especially in the SOT23 package-so thermal derating must be applied per the 8.7mW/°C derating factor above +70°C ambient.
Does the MAX4231AUT require external compensation when driving a 100nF capacitive load?
No, the MAX4231AUT does not require external compensation for a 100nF load. Its specified capacitive-load stability limit is 780pF; 100nF (100,000pF) far exceeds this, and would cause severe ringing or oscillation. For such loads, an isolation resistor (RISO) must be added in series with the output, as shown in Figure 9 of the MAX4230–MAX4234 datasheet, to restore phase margin.
What is the typical output voltage swing of the MAX4231AUT into a 32Ω load at 2.7V supply?
At VDD = 2.7V and RL = 32Ω, the MAX4231AUT delivers a typical output swing of VDD − VOH = 400mV and VOL − VSS = 360mV, meaning it swings from ~0.36V to ~2.3V-achieving >85% of the full rail-to-rail range. This is confirmed in the "Output Voltage" section of the DC Electrical Characteristics table (page 3, IL = 30mA row).
How does the shutdown feature of the MAX4231AUT behave electrically during disable?
When SHDN is pulled low, the MAX4231AUT disables its internal circuitry and actively drives the OUT pin to VSS (ground) with ≤120mV output voltage at 200Ω load. Its shutdown output impedance is 10Ω typical, ensuring strong low-state assertion-critical for preventing unintended RF PA turn-on. Supply current drops to <1µA per amplifier.
Is the MAX4231AUT qualified for automotive applications, and what temperature range does it support?
Yes, the MAX4231AUT is explicitly qualified for automotive applications, with an operating temperature range of -40°C to +125°C, as stated in the Ordering Information table and Absolute Maximum Ratings. It meets AEC-Q100 stress-test requirements for reliability in engine control units, infotainment systems, and ADAS audio subsystems.
MAX4231AUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 850 µV
- Current - Supply:
- 1.2mA
- Current - Output / Channel:
- 200 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX4231AUT FAQ
1.How can I place an order for MAX4231AUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4231AUT 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 MAX4231AUT reliable?
The price and inventory of MAX4231AUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4231AUT is usually 5 days.
3.What payment methods are accepted for MAX4231AUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4231AUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4231AUT?
MAX4231AUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4231AUT 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 MAX4231AUT?
For technical support, including MAX4231AUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4231AUT requirements.
6.How does Aetrix verify that MAX4231AUT is sourced from the original manufacturer or authorized distributors?
All MAX4231AUT 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 MAX4231AUT meets industry standards.
7.What is the process for return or replacement of MAX4231AUT?
All MAX4231AUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX4231AUT, 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 MAX4231AUT part is unused and in its original packaging.
Return procedure for MAX4231AUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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