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Analog Devices Inc./Maxim Integrated MAX8511ETA31+T
- Part No.:
- MAX8511ETA31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
MAX8511ETA31+T.pdf
- Description:
- IC REG LINEAR 3.1V 120MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MAX8511ETA31+T from Maxim Integrated is a 3.1V fixed-output, ultra-low-noise, low-dropout linear regulator delivering up to 120mA with 120mV dropout at full load, 40μA ground current, and stable operation using only 1μF ceramic input/output capacitors. It targets noise-sensitive RF and analog circuitry in portable battery-powered systems.
For engineers reviewing the MAX8511ETA31+T datasheet, MAX8511ETA31+T pinout, MAX8511ETA31+T application, or MAX8511ETA31+T equivalent, key selection criteria include output voltage accuracy (±2% over load/temperature), PSRR (72dB at 1kHz), shutdown current (<1μA), thermal protection (160°C trip), and TDFN-EP package compatibility with high-density PCB layouts.
Technical Context
The MAX8511ETA31+T uses a P-channel MOSFET pass transistor (1Ω typical RDS(ON)) enabling low dropout and minimal quiescent current-no base drive required unlike PNP-based LDOs. Its architecture omits the BP (bypass) pin, eliminating need for external noise-reduction capacitor and reducing board area.
It integrates overcurrent limiting (130–300mA range), thermal shutdown with 10°C hysteresis, and logic-level shutdown control (SHDN active-low, 0.4V max low threshold). Designed for 2V–6V input, it maintains ±3% output voltage accuracy across –40°C to +85°C and 100μA–80mA load range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.1V ±2% (guaranteed over load/temperature; enables direct replacement of 3.1V rails without feedback resistor network) |
| Max Output Current | 120mA continuous (supports moderate-power RF ICs, ADCs, or sensor signal chains without derating) |
| Dropout Voltage | 120mV at 120mA load (allows operation down to VIN = 3.22V, extending usable battery life in single-cell Li-ion or dual-cell alkaline systems) |
| Ground Current | 40μA typical at light load (minimizes standby power loss; critical for always-on subsystems) |
| PSRR | 72dB at 1kHz, 46dB at 100kHz (suppresses switching noise from DC-DC converters feeding the LDO input) |
| Shutdown Current | <1μA (enables deep-sleep modes in portable devices; SHDN pin compatible with 1.8V/3.3V GPIO) |
| Thermal Protection | 160°C shutdown with 10°C hysteresis (prevents permanent damage during sustained overload or poor heatsinking) |
Pinout & Package
MAX8511ETA31+T is housed in an 8-pin, 2mm × 2mm × 0.8mm TDFN-EP package with exposed pad (EP) internally connected to GND for enhanced thermal performance. The EP must be soldered to a large PCB ground plane to achieve θJA = 83.9°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Unregulated Input Supply | Accepts 2V–6V input; requires 1μF ceramic capacitor to GND for stability and noise filtering |
| 2 (GND) | Ground Reference and Thermal Path | Primary return path; connects internally to EP; must tie to solid ground plane for thermal dissipation |
| 3 (SHDN) | Active-Low Shutdown Control | Pull ≤0.4V to disable regulator; draws <0.01μA bias current; compatible with 1.8V logic |
| 4 (NC) | No Connection | Not internally bonded; leave unconnected or float; no electrical function |
| 5 (OUT) | Regulated Output Voltage | Delivers stable 3.1V; bypassed with 1μF ceramic capacitor to GND; high-impedance when disabled |
| 6, 7, 8 (NC) | No Connection | Unused pins; no internal connection; may be left unconnected or tied to GND for mechanical stability |
| EP | Exposed Pad (GND) | Internally connected to GND; mandatory thermal interface; must be soldered to ≥100mm² copper area |
Key Features
| Feature | Design Value |
|---|---|
| No BP pin required | Eliminates external 10nF bypass capacitor, reducing BOM count and PCB footprint by ~0.5mm² vs. MAX8510 variants |
| Stable with 1μF ceramic caps | Enables use of low-cost, small-footprint X5R/X7R MLCCs without ESR tuning-no minimum ESR constraint |
| Ultra-low ground current | 40μA typical at light load ensures >1-year battery life in 10μA average-current IoT sensors powered from coin cells |
| Integrated protection | Current limit (130–300mA) and thermal shutdown (160°C/150°C max junction) allow safe operation under fault conditions without external circuitry |
| Logic-compatible shutdown | 0.4V max SHDN low threshold supports direct interfacing with 1.8V/2.5V/3.3V microcontrollers without level-shifting |
Applications
| Cellular Front-End Modules | Portable Audio DAC Power |
|---|---|
|
Use Scenario: Powering RF transceiver LNA and mixer stages in 4G/5G handset front-end modules where supply noise directly impacts EVM and adjacent channel leakage. IC Role / Device Role / Timing Role: Low-noise post-regulator supplying clean 3.1V bias to analog RF blocks downstream of noisy buck converters. Use Value: 230μVRMS output noise and 72dB PSRR at 1kHz prevent AM-to-PM distortion and maintain ACLR >45dB. |
Use Scenario: Providing ultra-quiet analog supply for stereo audio DACs (e.g., PCM5102A) in Bluetooth headphones and portable speakers. IC Role / Device Role / Timing Role: Dedicated low-noise LDO for DAC VDDA rail, decoupling digital switching noise from sensitive analog reference paths. Use Value: 120mV dropout allows operation from partially discharged 3.6V Li-ion, while 40μA quiescent current extends playback time between charges. |
| Medical Wearable Sensors | Industrial Handheld Scanners |
|
Use Scenario: Powering precision analog front-ends (e.g., instrumentation amplifiers, 24-bit sigma-delta ADCs) in ECG/PPG patches requiring sub-μV noise floors. IC Role / Device Role / Timing Role: Primary analog supply regulator ensuring <±0.5% output drift over temperature and load for calibrated biosignal acquisition. Use Value: ±2% output accuracy and 0.003%/mA load regulation minimize gain error in sensor signal chains without software calibration. |
Use Scenario: Supplying image sensor and laser driver circuits in rugged barcode scanners operating from 2xAA or Li-Po batteries. IC Role / Device Role / Timing Role: Main system LDO delivering regulated 3.1V to CMOS image sensor and timing-critical laser diode drivers. Use Value: Thermal shutdown and current limiting protect against short-circuits during field use; TDFN package withstands mechanical shock per MIL-STD-883. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B312MR-G | 3.1V fixed, 150mA, 120mV dropout, 25μA IQ, but only 55dB PSRR at 1kHz and no thermal shutdown | Lacks integrated thermal protection; suitable only for thermally benign environments with external thermal monitoring | Prefer when lowest quiescent current is critical and thermal risk is mitigated externally |
| Analog Devices ADP125ARHZ-3.1-R7 | 3.1V fixed, 500mA, 135mV dropout, 30μA IQ, 65dB PSRR at 1kHz, includes soft-start but larger 6-lead SOT-23 package | Higher current capability and soft-start beneficial for powering multiple downstream rails, but larger footprint and lower PSRR | Choose when higher output current or controlled startup sequencing is required |
Compared with XC6219B312MR-G and ADP125ARHZ-3.1-R7, MAX8511ETA31+T delivers superior PSRR (72dB vs. ≤65dB) and integrated thermal safety in the smallest 2mm×2mm footprint-critical for space-constrained RF modules and wearables where noise and reliability are non-negotiable.
Availability
MAX8511ETA31+T is available at Aetrix Electronics and suitable for cellular front-end modules, portable audio DACs, medical wearable sensors, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8511ETA31+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) designs high-performance analog and mixed-signal ICs for demanding applications in communications, computing, consumer, and industrial markets.
The MAX8510/MAX8511/MAX8512 family was engineered specifically for ultra-low-noise, low-quiescent-current power regulation in space-constrained portable electronics-prioritizing noise suppression, dropout efficiency, and minimal external components.
FAQ
What is the output voltage tolerance of MAX8511ETA31+T over temperature and load?
The MAX8511ETA31+T guarantees ±2% output voltage accuracy across –40°C to +85°C ambient temperature and 100μA to 80mA load current. At room temperature and 1mA load, accuracy tightens to ±1%. This ensures reliable operation for 3.1V-dependent analog circuits without external trimming.
Does MAX8511ETA31+T require an external bypass capacitor on the BP pin?
No, MAX8511ETA31+T does not include a BP (bypass) pin and therefore requires no external bypass capacitor. Unlike the MAX8510 series, its architecture achieves 230μVRMS output noise without BP-reducing component count and PCB area while maintaining robust noise performance for RF and audio applications.
What is the maximum input voltage rating for MAX8511ETA31+T?
The absolute maximum input voltage for MAX8511ETA31+T is +7V, but the recommended operating range is 2V to 6V. Exceeding 6V risks exceeding the 0.953W power dissipation limit in the TDFN package-even at light loads-due to increased (VIN – VOUT) × IOUT losses and thermal stress.
How does the shutdown functionality work on MAX8511ETA31+T?
Driving the SHDN pin ≤0.4V disables MAX8511ETA31+T, dropping output to high-impedance and reducing supply current to <1μA. The pin accepts logic-high up to VIN + 0.3V and draws <0.01μA bias current. No external pull-up is needed-connect directly to MCU GPIO for precise power sequencing control.
Can MAX8511ETA31+T be used with ceramic capacitors smaller than 1μF?
No-MAX8511ETA31+T is specified and guaranteed stable only with ≥1μF ceramic output capacitance (X5R/X7R dielectric). Using smaller values risks oscillation or degraded transient response. Input capacitance must also be ≥1μF; both capacitors should be placed within 3mm of the IN and OUT pins respectively.
MAX8511ETA31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.12V @ 120mA (Typ)
- Current - Output:
- 120mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 72dB ~ 46dB (1kHz ~ 100kHz)
- Control Features:
- Shutdown
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN-EP (2x2)
MAX8511ETA31+T FAQ
1.How can I place an order for MAX8511ETA31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8511ETA31+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 MAX8511ETA31+T reliable?
The price and inventory of MAX8511ETA31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8511ETA31+T is usually 5 days.
3.What payment methods are accepted for MAX8511ETA31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8511ETA31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8511ETA31+T?
MAX8511ETA31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8511ETA31+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 MAX8511ETA31+T?
For technical support, including MAX8511ETA31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8511ETA31+T requirements.
6.How does Aetrix verify that MAX8511ETA31+T is sourced from the original manufacturer or authorized distributors?
All MAX8511ETA31+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 MAX8511ETA31+T meets industry standards.
7.What is the process for return or replacement of MAX8511ETA31+T?
All MAX8511ETA31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8511ETA31+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 MAX8511ETA31+T part is unused and in its original packaging.
Return procedure for MAX8511ETA31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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