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Analog Devices Inc./Maxim Integrated MAX8840ELT40+
- Part No.:
- MAX8840ELT40+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8840ELT40+.pdf
- Description:
- IC REG LIN ULTRA LO NOISE HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:12,670
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Product details
Overview
MAX8840ELT40+ from Maxim Integrated is a 4.0V fixed-output, 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. It employs a p-channel MOSFET pass transistor, operates from 2V–6V input, and targets noise-sensitive analog rails in portable RF systems.
For engineers reviewing the MAX8840ELT40+ datasheet, MAX8840ELT40+ pinout, MAX8840ELT40+ application, or MAX8840ELT40+ equivalent, key selection criteria include its 4.0V preset output, µDFN-6 (1.5mm × 1.0mm) package, sub-1µA shutdown current, 40µA ground current under light load, and BP-capacitor–enabled ultra-low-noise performance.
Technical Context
The MAX8840ELT40+ uses an integrated 1.225V bandgap reference and error amplifier to regulate output via a 1Ω (typ) p-channel MOSFET pass transistor-eliminating base-drive current and enabling stable 40µA quiescent operation across load and temperature. Its BP pin connects to an external 10nF capacitor that shunts high-frequency noise from the internal reference path, directly enabling the 11µVRMS noise specification.
Shutdown logic disables the voltage reference, error amplifier, gate driver, and pass transistor when SHDN is pulled low, reducing supply current to <1µA while placing OUT in high-impedance state. Thermal protection activates at +160°C junction temperature with 10°C hysteresis, ensuring safe operation during overload or poor heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0V ±3% over load/temperature - ensures stable bias for 3.3V/4.0V analog circuitry without external feedback components. |
| Dropout Voltage | 120mV at 120mA load - enables operation down to VIN = 4.12V, extending usable battery life in single-cell Li-ion or dual-cell alkaline systems. |
| Output Noise | 11µVRMS (100Hz–100kHz) with 10nF BP capacitor - meets stringent noise requirements for RF receivers, ADC references, and PLL VCO supplies. |
| PSRR | 78dB at 1kHz, 54dB at 100kHz - suppresses switching noise from DC-DC converters feeding the LDO input, critical in mixed-signal SoC power domains. |
| Ground Current | 40µA typical at no load - minimizes standby power loss in always-on subsystems such as Bluetooth LE or sensor wake-up circuits. |
| Shutdown Current | <1µA - supports deep-sleep modes in portable devices without compromising system-level energy budgets. |
| Stability | Guaranteed with 1µF ceramic output capacitor - eliminates need for costly tantalum or large-case ceramics, reducing BOM cost and PCB area. |
Pinout & Package
MAX8840ELT40+ 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 dissipation in space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Unregulated input supply | Accepts 2V–6V input; requires 1µF ceramic bypass to GND for stability and line-transient suppression. |
| 2 GND | Power and thermal ground | Primary return path for load current and internal circuitry; also serves as thermal conduction path to PCB ground plane. |
| 3 SHDN | Active-low enable control | Pull ≤0.4V to disable regulator; connect to IN or logic high for normal operation; input bias current <0.1µA minimizes leakage impact. |
| 4 BP | Noise bypass terminal | Connects to OUT via 10nF capacitor to reduce reference noise; shorted to OUT during shutdown; leakage <10nA preserves capacitor charge. |
| 5 N.C. | No internal connection | Not bonded; must be left floating or tied to GND per layout best practice-no electrical function. |
| 6 OUT | Regulated 4.0V output | Delivers up to 150mA; requires 1µF ceramic capacitor to GND; high-impedance when SHDN is active. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 11µVRMS (100Hz–100kHz) enabled by dedicated BP pin and internal noise-bypass architecture-critical for RF front-end and precision analog supply rails. |
| High PSRR at audio frequencies | 78dB at 1kHz-effectively attenuates ripple from upstream switching regulators, preventing audible noise in audio codecs and DACs. |
| p-Channel MOSFET pass element | 1Ω typical RDS(ON) with zero base-drive current-enables 40µA ground current and consistent dropout behavior independent of load current. |
| Thermal and overcurrent protection | Auto-recovering thermal shutdown at +160°C (10°C hysteresis) and current limit ≥150mA-ensures robustness during fault conditions without external circuitry. |
| Minimal external components | Only IN and OUT 1µF ceramic capacitors required-reduces bill-of-materials, PCB footprint, and design validation effort versus multi-capacitor LDO solutions. |
Applications
| Bluetooth Radio Module Power | RF Transceiver Bias Rail |
|---|---|
Use Scenario: Powers the RF section of a Class 2 Bluetooth transceiver operating from a 3.6V Li-ion cell. IC Role / Device Role / Timing Role: Provides ultra-clean 4.0V supply to VCO and LNA stages, isolating them from noisy digital core voltage. Use Value: 11µVRMS noise and 78dB PSRR prevent reciprocal mixing and phase noise degradation, maintaining -80dBm sensitivity. |
Use Scenario: Supplies the analog front-end of a 2.4GHz ISM-band transceiver in a wireless sensor node. IC Role / Device Role / Timing Role: Delivers stable 4.0V rail to mixer and IF amplifier, rejecting switching noise from adjacent buck converter. Use Value: 120mV dropout allows operation until battery reaches 4.12V, maximizing runtime; 40µA IQ extends shelf-life in storage mode. |
| Digital Camera Image Sensor Bias | Portable Audio Codec Reference |
Use Scenario: Generates clean bias for CMOS image sensor analog signal chain in a compact digital camera. IC Role / Device Role / Timing Role: Regulates 4.0V for column ADC reference and pixel amplifiers, decoupled from noisy processor domain. Use Value: Sub-1µA shutdown current enables fast power cycling between frames; 1µF stability simplifies layout in tight sensor module space. |
Use Scenario: Supplies reference voltage and analog supply to stereo audio codec in a personal stereo device. IC Role / Device Role / Timing Role: Low-noise 4.0V rail powers DAC output stage and headphone amplifier bias networks. Use Value: 11µVRMS noise prevents audible hiss; 78dB PSRR blocks 1MHz switching artifacts from PMU, preserving SNR >95dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2040PDBVR | 4.0V fixed, 25µVRMS noise (10Hz–100kHz), 68dB PSRR at 1kHz, 0.8V dropout at 300mA, SOT-23-5 package (2.9mm × 1.6mm) | Larger footprint, higher noise, lower PSRR-suitable where board area is less constrained and noise budget allows ~2× increase. | Select when requiring higher output current (300mA) and compatibility with legacy SOT-23 layouts; not drop-in due to pinout and noise performance gap. |
| MCP1703T-4002E/MB | 4.0V fixed, 30µVRMS noise (10Hz–100kHz), 60dB PSRR at 1kHz, 600mV dropout at 250mA, SOT-23-3 package (same pinout as TO-220 variant) | Higher dropout, significantly higher noise, no BP pin-intended for general-purpose, non-RF applications. | Choose for cost-sensitive, non-noise-critical systems where 4.0V regulation suffices and µDFN assembly capability is unavailable. |
Compared with TPS7A2040PDBVR and MCP1703T-4002E/MB, the MAX8840ELT40+ delivers superior noise and PSRR in a 60% smaller footprint, making it the preferred choice for RF and precision analog supply domains where spectral purity and space are primary constraints.
Availability
MAX8840ELT40+ is available at Aetrix Electronics and suitable for Bluetooth radios, RF transceivers, digital camera sensors, and portable audio codecs requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX8840ELT40+ 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 series belongs to Maxim's ultra-low-noise LDO product line, engineered specifically for powering noise-sensitive RF, analog, and mixed-signal circuits in battery-operated portable equipment.
FAQ
What is the output voltage tolerance of the MAX8840ELT40+ over temperature and load?
The MAX8840ELT40+ maintains ±3% output voltage accuracy across the full –40°C to +85°C operating temperature range and for load currents from 100µA to 80mA. At room temperature and 1mA load, the tolerance tightens to ±1%. This specification ensures reliable operation of downstream 4.0V-tolerant analog circuitry without additional calibration or trimming.
Does the MAX8840ELT40+ require an external bypass capacitor on the BP pin, and what happens if it is omitted?
Yes-the MAX8840ELT40+ requires a 10nF capacitor between BP and OUT to achieve its specified 11µVRMS output noise. Without this capacitor, output noise rises to 230µVRMS (typ), degrading performance in RF and precision analog applications. The BP pin is internally shorted to OUT during shutdown, so the capacitor remains safely biased.
Can the MAX8840ELT40+ be used with input voltages below 2.0V?
No-the absolute minimum input voltage for the MAX8840ELT40+ is 2.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.0V may result in improper regulation, increased dropout, or failure to start up. For sub-2V operation, consider alternative LDOs with lower VIN min specifications.
How does the thermal shutdown behavior of the MAX8840ELT40+ affect system reliability?
The MAX8840ELT40+ enters thermal shutdown at +160°C junction temperature and resumes operation only after cooling by 10°C (hysteresis). During sustained overload, this causes pulsed output rather than latch-off, allowing gradual thermal recovery without manual reset. This behavior protects the IC and PCB while enabling graceful degradation in thermally constrained designs.
Is the MAX8840ELT40+ compatible with standard 1µF X5R/X7R ceramic capacitors for both input and output?
Yes-the MAX8840ELT40+ is fully stable with 1µF X5R or X7R ceramic capacitors on both IN and OUT pins across the full operating temperature range. These dielectrics provide sufficient capacitance and low ESR without significant variation, eliminating the need for larger or more expensive capacitor types while ensuring robust transient response and PSRR performance.
MAX8840ELT40+ 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):
- 4V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.12V @ 120mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 78dB ~ 54dB (1kHz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-uDFN (1.5x1)
MAX8840ELT40+ FAQ
1.How can I place an order for MAX8840ELT40+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8840ELT40+ 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 MAX8840ELT40+ reliable?
The price and inventory of MAX8840ELT40+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8840ELT40+ is usually 5 days.
3.What payment methods are accepted for MAX8840ELT40+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8840ELT40+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8840ELT40+?
MAX8840ELT40+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8840ELT40+ 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 MAX8840ELT40+?
For technical support, including MAX8840ELT40+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8840ELT40+ requirements.
6.How does Aetrix verify that MAX8840ELT40+ is sourced from the original manufacturer or authorized distributors?
All MAX8840ELT40+ 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 MAX8840ELT40+ meets industry standards.
7.What is the process for return or replacement of MAX8840ELT40+?
All MAX8840ELT40+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8840ELT40+, 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 MAX8840ELT40+ part is unused and in its original packaging.
Return procedure for MAX8840ELT40+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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