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Analog Devices Inc./Maxim Integrated MAX4231AUT-T
- Part No.:
- MAX4231AUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4231AUT-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,095
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Product details
Overview
The MAX4231AUT-T from Maxim Integrated is a single, rail-to-rail input/output CMOS operational amplifier with integrated shutdown control, designed for high-current output drive in portable RF and audio systems. It delivers 200mA peak output current, features 10MHz gain-bandwidth product and 10V/μs slew rate, operates from a single 2.7V to 5.5V supply, and is packaged in a 6-pin SOT23. It is used to bias RF power amplifiers in wireless handsets and drive 32Ω headset loads.
For engineers reviewing the MAX4231AUT-T datasheet, MAX4231AUT-T pinout, MAX4231AUT-T application, or MAX4231AUT-T equivalent, key selection criteria include shutdown-enabled low-power operation (<1μA), rail-to-rail I/O swing under heavy load (≤500mV from rails at 32Ω), capacitive-load stability up to 780pF, and guaranteed performance across –40°C to +125°C.
Technical Context
The MAX4231AUT-T implements parallel n- and p-channel differential input stages to achieve true rail-to-rail common-mode input range (VSS to VDD), with each stage active over complementary voltage regions. Its output stage supports rail-to-rail swing while sourcing/sinking up to 200mA - critical for driving low-impedance RF PA bias networks and 32Ω audio loads without external buffers.
Shutdown functionality is implemented via a dedicated SHDN pin that actively pulls the output to VSS when asserted low, ensuring RF PA disablement with <1μA quiescent current per amplifier. The device maintains unity-gain stability with capacitive loads ≤780pF and exhibits no phase reversal under overdriven input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V single supply - enables direct integration into Li-ion–powered handheld devices without level-shifting. |
| Gain-Bandwidth Product | 10MHz - supports stable closed-loop gain ≥10 at audio frequencies up to 1MHz, suitable for wideband PA bias control and DAC buffering. |
| Slew Rate | 10V/μs - ensures fast transient response for RF envelope tracking and headphone driver step recovery. |
| Output Drive Current | 200mA peak - directly drives 32Ω headsets and RF PA bias nodes without external transistors or discrete drivers. |
| Input Offset Voltage | ±8mV max - minimizes DC error in precision biasing circuits where offset-induced PA quiescent current drift must be constrained. |
| Shutdown Current | <1μA at VDD = 2.7V - extends battery life in intermittent-use applications like hands-free call detection and standby PA control. |
| Capacitive Load Stability | Stable up to 780pF - eliminates need for isolation resistors when driving long PCB traces or filter capacitors in RF front-end bias paths. |
Pinout & Package
MAX4231AUT-T is housed in a 6-pin SOT23 package (package code U6SN+1), measuring 2.9mm × 1.6mm × 1.1mm, with exposed pad option not applicable. Pin functions are validated per Maxim's official pin configuration diagram (page 13, Rev 23).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input - accepts full rail-to-rail common-mode signals (VSS to VDD) for accurate bias reference tracking. |
| 2 | IN− | Inverting input - forms feedback node; high input impedance (1000MΩ) minimizes loading on preceding DAC or control circuitry. |
| 3 | OUT | Amplifier output - capable of sourcing/sinking 200mA while maintaining rail-to-rail swing; actively driven to VSS during shutdown. |
| 4 | VSS | Negative supply - connects to ground in single-supply configurations; serves as return path for output current and shutdown sink. |
| 5 | VDD | Positive supply - accepts 2.7V–5.5V; requires local 0.1μF ceramic bypass to ensure stability under high-current transients. |
| 6 | SHDN | Shutdown control - TTL/CMOS-compatible logic input; asserts shutdown when pulled below 0.8V, enabling system-level power gating. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in single-supply 3.3V/5V systems, eliminating level-shifting components in PA bias chains. |
| 200mA peak output drive | Directly interfaces with RF PA gate/base nodes and 32Ω audio loads without external buffer stages, reducing BOM count and board area. |
| No phase reversal on overdrive | Prevents uncontrolled RF PA turn-on during input signal clipping - critical for handset ESD robustness and call reliability. |
| Unity-gain stable to 780pF | Supports direct connection to RF matching networks and LC filters without destabilizing compensation, simplifying front-end design. |
| Active-low shutdown with VSS output | Ensures RF PA is fully disabled (not just biased off) during sleep mode, blocking unintended antenna radiation and leakage current paths. |
Applications
| RF PA Bias Control in Wireless Handsets | Single-Supply Headphone Driver |
|---|---|
Use Scenario: Biasing the gate of a GaAs or SiGe RF power amplifier in a GSM/WCDMA/LTE mobile handset during transmit bursts. IC Role / Device Role / Timing Role: Precision voltage-controlled current source delivering stable DC bias under fast envelope modulation, with shutdown disabling PA between frames. Use Value: Eliminates discrete transistor bias networks; 200mA drive ensures sufficient gate charge delivery for fast PA turn-on/turn-off, reducing TX-RX switching latency. | Use Scenario: Driving stereo 32Ω earpieces from a single 5V supply in portable media players or Bluetooth headsets. IC Role / Device Role / Timing Role: Low-distortion, high-current output buffer for DAC outputs, configured as noninverting amplifier with AC-coupled output. Use Value: Delivers 60mW/channel at <1% THD+N; rail-to-rail swing maximizes usable voltage headroom, extending battery runtime versus legacy op amps. |
| Audio Hands-Free Car Kit Interface | DAC Output Buffer for Portable Instrumentation |
Use Scenario: Amplifying microphone and speaker signals in automotive hands-free kits with strict EMC and thermal constraints. IC Role / Device Role / Timing Role: Dual-role amplifier: one channel buffers mic preamp output, another drives speaker load; shutdown disables both during mute. Use Value: 10V/μs slew rate preserves voice fidelity; 85dB PSRR rejects ignition noise; shutdown reduces quiescent current to <1μA during vehicle sleep mode. | Use Scenario: Buffering 12-bit/16-bit DAC outputs in portable test equipment requiring low noise, high linearity, and fast settling. IC Role / Device Role / Timing Role: Unity-gain follower isolating DAC from varying load impedances while preserving DC accuracy and bandwidth. Use Value: ±8mV max VOS and 15nV/√Hz input noise maintain DAC resolution; 10MHz GBWP supports >100kHz update rates with minimal droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-drive op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2377AIDBVR | Lower output drive (65mA), no shutdown, 5.5MHz GBWP, 2.5V–5.5V supply | Not suitable for RF PA bias or 32Ω headset drive; limited to medium-current signal conditioning | Select only if drive requirement ≤65mA and shutdown is unnecessary. |
| ADA4891-1ARJZ-R7 | 175mA output drive, no shutdown, 220MHz GBWP, 3V–11V supply, higher quiescent current (5.6mA) | Better for high-frequency signal chain but lacks shutdown and consumes >5× more supply current in active mode | Choose when bandwidth >10MHz is required and battery life is secondary to speed. |
Compared with OPA2377AIDBVR and ADA4891-1ARJZ-R7, the MAX4231AUT-T uniquely combines 200mA drive, rail-to-rail I/O, sub-1μA shutdown, and 10MHz bandwidth in a 6-pin SOT23 - making it the only option qualified for RF PA bias control with system-level power gating in space-constrained handhelds.
Availability
MAX4231AUT-T is available at Aetrix Electronics and suitable for RF power amplifier biasing, portable headphone driver designs, and DAC output buffering requiring stable component supply across industrial temperature ranges and high-volume production cycles.
Supply support for MAX4231AUT-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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for demanding applications in communications, computing, and consumer electronics.
The MAX4230–MAX4234 family was engineered specifically for high-current, rail-to-rail operational amplification in battery-powered RF and audio subsystems - prioritizing output drive, shutdown efficiency, and capacitive-load robustness over raw bandwidth.
FAQ
What is the maximum continuous output current specification for the MAX4231AUT-T?
The MAX4231AUT-T is rated for 200mA peak output current under specified conditions (VDD = 5V, VIN = ±100mV). Continuous DC output current capability depends on thermal limits and package power dissipation - for the 6-pin SOT23, continuous dissipation is limited to 1072mW at TA = +70°C. Derating applies above this temperature. The MAX4231AUT-T datasheet specifies output short-circuit duration to VDD or VSS is limited to 10 seconds maximum.
Does the MAX4231AUT-T support true rail-to-rail input common-mode voltage range?
Yes, the MAX4231AUT-T supports a true rail-to-rail input common-mode voltage range from VSS to VDD, enabled by parallel n-channel and p-channel differential input stages. This allows the device to accurately amplify signals near either supply rail - essential for biasing RF PAs referenced to VDD or ground and for interfacing with rail-to-rail DAC outputs. Input offset voltage remains within ±8mV across this full range.
How does the shutdown function behave on the MAX4231AUT-T output pin?
When the SHDN pin of the MAX4231AUT-T is pulled low (≤0.8V), the amplifier enters shutdown mode and its output is actively driven to VSS (ground), not placed in high-impedance state. This ensures reliable disablement of downstream RF power amplifiers by pulling their bias node to ground. The shutdown supply current drops to <1μA at VDD = 2.7V, and enable time from shutdown is 6μs.
Can the MAX4231AUT-T drive a 32Ω headset load with acceptable distortion performance?
Yes, the MAX4231AUT-T is explicitly optimized for 32Ω headset drive. At VDD = 5V, it delivers 60mW per channel with <1% THD+N at 10kHz and 2VP-P output. Its rail-to-rail output swing (≤500mV from rails into 32Ω) and 10V/μs slew rate preserve audio fidelity, while 200mA peak current ensures adequate headroom for dynamic peaks without clipping.
Is the MAX4231AUT-T qualified for automotive applications?
No, the MAX4231AUT-T is not automotive-qualified. Automotive-grade variants are designated with "/V" suffix (e.g., MAX4231AUT/V+T) and undergo AEC-Q100 stress testing. The MAX4231AUT-T is rated for –40°C to +125°C operating temperature but lacks the extended reliability validation, traceability, and qualification documentation required for automotive use cases.
MAX4231AUT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 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-6
MAX4231AUT-T FAQ
1.How can I place an order for MAX4231AUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4231AUT-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 MAX4231AUT-T reliable?
The price and inventory of MAX4231AUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4231AUT-T is usually 5 days.
3.What payment methods are accepted for MAX4231AUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4231AUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4231AUT-T?
MAX4231AUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4231AUT-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 MAX4231AUT-T?
For technical support, including MAX4231AUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4231AUT-T requirements.
6.How does Aetrix verify that MAX4231AUT-T is sourced from the original manufacturer or authorized distributors?
All MAX4231AUT-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 MAX4231AUT-T meets industry standards.
7.What is the process for return or replacement of MAX4231AUT-T?
All MAX4231AUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4231AUT-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 MAX4231AUT-T part is unused and in its original packaging.
Return procedure for MAX4231AUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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