My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX8840ELT31+
- Part No.:
- MAX8840ELT31+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8840ELT31+.pdf
- Description:
- ULTRA-LOW-NOISE, HIGH PSRR, LOW-
- Quantity:
- Payment:
- Shipping:
Inventory:1,173
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX8840ELT31+ from Maxim Integrated is a preset 3.1V, ultra-low-noise, high-PSRR, low-dropout linear regulator delivering up to 150mA output current with 120mV dropout at 120mA load, 11µVRMS output noise (100Hz–100kHz), and 78dB PSRR at 1kHz - designed for powering noise-sensitive RF and analog circuitry in portable battery-powered systems.
For engineers reviewing the MAX8840ELT31+ datasheet, MAX8840ELT31+ pinout, MAX8840ELT31+ application, or MAX8840ELT31+ equivalent, key selection criteria include its 3.1V fixed output, µDFN-6 (1.5mm × 1.0mm) package, BP-pin noise-bypass capability, 40µA ground current, and guaranteed stability with 1µF ceramic output capacitance.
Technical Context
The MAX8840ELT31+ employs a p-channel MOSFET series pass transistor (typ. RDS(ON) = 1Ω) enabling low quiescent current and minimal dropout voltage across load and temperature. Its bandgap reference (1.225V) feeds an error amplifier that controls the pass gate via internal feedback, delivering tight output regulation.
Noise reduction is achieved through a dedicated BP pin connected to a 10nF capacitor between BP and OUT, which shunts high-frequency noise from the bandgap core - a feature exclusive to the MAX8840 variant and not present in MAX8841/MAX8842.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.1V ±3% over -40°C to +85°C - ensures stable biasing for 3.3V-tolerant analog/RF ICs without external resistors. |
| Max Output Current | 150mA guaranteed - supports moderate-power RF front-ends, ADC/DAC references, and sensor signal chains. |
| Dropout Voltage | 120mV at 120mA load - enables operation down to VIN = 3.22V, extending usable battery life in single-cell Li-ion or 3.3V rail systems. |
| Output Noise | 11µVRMS (100Hz–100kHz) with 10nF BP cap - meets stringent phase-noise and SNR requirements in VCOs, PLLs, and audio codecs. |
| PSRR | 78dB at 1kHz, 54dB at 100kHz - suppresses switching noise from DC-DC converters feeding adjacent digital blocks. |
| Ground Current | 40µA typical at light load - minimizes standby power in always-on subsystems like Bluetooth LE receivers or real-time clocks. |
| Shutdown Current | <1µA - enables deep-sleep modes without compromising fast wake-up (<300µs exit delay). |
Pinout & Package
MAX8840ELT31+ is housed in a lead-free, RoHS-compliant 6-pin µDFN package measuring 1.5mm × 1.0mm × 0.8mm, with exposed thermal pad (GND-connected) for enhanced thermal performance in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Unregulated Input Supply | Accepts 2V–6V input; requires 1µF ceramic decoupling close to pin for stability and transient response. |
| 2 GND | Ground Reference & Thermal Path | Electrical return and primary heat dissipation path; must connect to large copper pour or internal ground plane. |
| 3 SHDN | Active-Low Enable Control | Pull ≤0.4V to disable regulator; logic-high ≥1.5V enables operation; draws <0.1µA bias current. |
| 4 BP | Noise Bypass Terminal | Connects 10nF capacitor to OUT to reduce output voltage noise by filtering bandgap reference ripple - unique to MAX8840 family. |
| 5 N.C. | No Internal Connection | Not bonded; must remain unconnected on PCB - no routing or pull-up/pull-down required. |
| 6 OUT | Regulated Output | Delivers 3.1V ±3%; stable with ≥1µF X7R/X5R ceramic capacitor; high-impedance during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 11µVRMS (100Hz–100kHz) enabled by BP pin and internal bandgap noise bypass - critical for RF synthesizer power rails. |
| High PSRR at audio frequencies | 78dB rejection at 1kHz - prevents audible hum or distortion in audio codec supplies fed from noisy system rails. |
| Stable with minimal capacitance | Guaranteed stability using only 1µF ceramic output capacitor - reduces BOM count and board area vs. legacy LDOs requiring ≥10µF. |
| p-Channel MOSFET pass element | Eliminates base-drive current loss; maintains 40µA ground current even under full 150mA load - extends battery runtime in portable devices. |
| Integrated protection | Thermal shutdown (160°C trip, 10°C hysteresis) and current limiting (150–300mA range) - prevents damage during short-circuit or overload events. |
Applications
| Cellular Transceiver Power | Low-Noise Audio Codec Supply |
|---|---|
Use Scenario: Powering the VCO, LNA, and mixer stages in GSM/UMTS/WCDMA front-end modules where supply ripple directly impacts EVM and adjacent channel leakage. IC Role / Device Role / Timing Role: Primary low-noise bias rail for RF signal chain components; replaces noisier switching regulators or higher-dropout LDOs. Use Value: 11µVRMS noise and 78dB PSRR at 1kHz prevent degradation of receiver sensitivity and transmit spectral purity. | Use Scenario: Supplying DAC/ADC reference buffers and headphone amplifiers in smartphones and portable media players. IC Role / Device Role / Timing Role: Clean analog supply rail decoupled from noisy digital cores and PMIC switchers. Use Value: Ultra-low noise avoids audible hiss; 3.1V output matches common audio IC bias requirements while allowing margin below 3.3V I/O rails. |
| Digital Camera Image Sensor Bias | Bluetooth LE Radio Core Supply |
Use Scenario: Providing regulated power to CMOS image sensor analog front-ends and column ADCs where supply noise causes fixed-pattern noise (FPN) and reduced dynamic range. IC Role / Device Role / Timing Role: Dedicated low-noise LDO for sensor analog block, isolated from digital pixel clock and interface noise. Use Value: 120mV dropout enables operation from partially discharged batteries; 11µVRMS noise preserves SNR in low-light imaging. | Use Scenario: Powering the RF transceiver and baseband processor in Bluetooth Low Energy earbuds and wearables requiring multi-day battery life and minimal RF interference. IC Role / Device Role / Timing Role: Always-on supply for BLE radio during advertising/scanning states; shut down during sleep via SHDN control. Use Value: <1µA shutdown current extends shelf life; 40µA quiescent current enables long idle periods without significant battery drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79531DRVR | 3.1V fixed output, 150mA, 130mV dropout @ 150mA, 30µVRMS noise, SOT-23-5 package | Larger footprint (2.9mm × 1.6mm), higher noise, no BP pin - less suitable for ultra-low-noise RF rails | Choose when µDFN assembly is unavailable or thermal constraints allow larger package. |
| ADP125ARHZ-3.1-R7 | 3.1V fixed output, 500mA, 135mV dropout @ 150mA, 45µVRMS noise, 6-lead LFCSP | Higher current rating but significantly higher output noise - trades noise performance for headroom and thermal margin | Prefer when future design scaling requires >150mA or when layout allows larger 2mm × 2mm package. |
Compared with TPS79531DRVR and ADP125ARHZ-3.1-R7, the MAX8840ELT31+ delivers the lowest output noise (11µVRMS) in the smallest footprint (1.5mm × 1.0mm), making it optimal for space- and noise-constrained RF/analog subsystems where every microvolt and square millimeter matters.
Availability
MAX8840ELT31+ is available at Aetrix Electronics and suitable for cellular transceivers, low-noise audio codecs, digital camera image sensors, and Bluetooth LE radio cores requiring stable component supply, consistent parametric performance, and long-term production availability.
Supply support for MAX8840ELT31+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX8840 family belongs to Maxim's ultra-low-noise LDO product line, engineered specifically for powering sensitive RF, audio, and imaging circuits in battery-operated portable electronics where PSRR, noise, and size are critical.
FAQ
What is the exact output voltage tolerance of the MAX8840ELT31+ over temperature and load?
The MAX8840ELT31+ guarantees ±3% output voltage accuracy over the full operating range of -40°C to +85°C and for load currents from 100µA to 80mA. At room temperature and 1mA load, the tolerance tightens to ±1%. This specification ensures reliable biasing of 3.3V-tolerant analog components without external trimming.
Does the MAX8840ELT31+ require an external bypass capacitor on the BP pin, and what happens if it is omitted?
Yes, the MAX8840ELT31+ requires a 10nF capacitor between BP and OUT to achieve its specified 11µVRMS output noise. Without this capacitor, output noise rises to 230µVRMS - a 21× increase - degrading performance in noise-sensitive applications like VCO power supplies. The BP pin is internally shorted to OUT during shutdown.
Can the MAX8840ELT31+ be used with input voltages below 2.0V?
No. The MAX8840ELT31+ has a minimum input voltage rating of 2.0V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.0V is not characterized or guaranteed, and may result in improper regulation, increased dropout, or failure to start up - especially near the 3.1V output where VIN must exceed VOUT + dropout (≥3.22V typical).
How does the thermal shutdown behavior of the MAX8840ELT31+ affect system reliability during sustained overload?
The MAX8840ELT31+ activates thermal shutdown at 160°C junction temperature and re-enables after cooling by 10°C (hysteresis). During continuous overload, this results in pulsed output rather than latch-off, preventing permanent damage while alerting the system to thermal stress - a safety feature that maintains long-term reliability without requiring external thermal monitoring.
Is the MAX8840ELT31+ compatible with standard 0201 or 0402 ceramic capacitors for input and output filtering?
Yes. The MAX8840ELT31+ is fully compatible with standard 0201 and 0402 X7R/X5R ceramic capacitors for both CIN and COUT. Its stability is guaranteed with ≥1µF total output capacitance, and the 0201 1µF X7R capacitor (e.g., GRM033R71C105KA12D) meets all requirements while minimizing PCB area - a key advantage in ultra-compact designs.
MAX8840ELT31+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Bulk
- Product Status:
- Active
- 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
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 500 µA
- Current - Supply (Max):
- -
- PSRR:
- 78dB ~ 54dB (1kHz ~ 100kHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX8840ELT31+ FAQ
1.How can I place an order for MAX8840ELT31+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8840ELT31+ 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 MAX8840ELT31+ reliable?
The price and inventory of MAX8840ELT31+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8840ELT31+ is usually 5 days.
3.What payment methods are accepted for MAX8840ELT31+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8840ELT31+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8840ELT31+?
MAX8840ELT31+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8840ELT31+ 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 MAX8840ELT31+?
For technical support, including MAX8840ELT31+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8840ELT31+ requirements.
6.How does Aetrix verify that MAX8840ELT31+ is sourced from the original manufacturer or authorized distributors?
All MAX8840ELT31+ 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 MAX8840ELT31+ meets industry standards.
7.What is the process for return or replacement of MAX8840ELT31+?
All MAX8840ELT31+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8840ELT31+, 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 MAX8840ELT31+ part is unused and in its original packaging.
Return procedure for MAX8840ELT31+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX8840ELT31+ Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
