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Analog Devices Inc./Maxim Integrated MAX8840ELT27+T
- Part No.:
- MAX8840ELT27+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8840ELT27+T.pdf
- Description:
- IC REG LINEAR 2.7V 150MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,249
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Product details
Overview
MAX8840ELT27+T from Maxim Integrated is a 2.7V fixed-output, ultra-low-noise, high-PSRR, low-dropout linear regulator delivering up to 150mA 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 MAX8840ELT27+T datasheet, MAX8840ELT27+T pinout, MAX8840ELT27+T application, or MAX8840ELT27+T equivalent, key selection criteria include its 2.7V preset output, µDFN-6 (1.5mm × 1.0mm) package, BP pin-enabled noise reduction, 40µA ground current, and guaranteed stability with 1µF ceramic output capacitance.
Technical Context
The MAX8840ELT27+T 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, ensuring tight output regulation.
Noise performance is enhanced by a dedicated BP pin connected to a 10nF capacitor, which shunts high-frequency noise from the error amplifier's bias network. Shutdown logic disables the reference, error amp, and gate driver, reducing supply current to <1µA while placing OUT in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.7V ±3% over -40°C to +85°C - ensures stable biasing for 2.7V I/O domains and analog subsystems. |
| Max Output Current | 150mA guaranteed - supports moderate-power RF ICs, ADCs, or sensor signal chains without thermal derating. |
| Dropout Voltage | 120mV at 120mA load - enables operation down to VIN = 2.82V, extending usable battery life in single-cell Li-ion or Li-poly systems. |
| Output Noise | 11µVRMS (100Hz–100kHz) with 10nF BP cap - meets stringent noise requirements for VCOs, PLLs, and high-resolution audio DACs. |
| PSRR | 78dB at 1kHz, 54dB at 100kHz - suppresses switching noise from DC-DC converters feeding the LDO input. |
| Ground Current | 40µA typical at light load - minimizes standby power loss in always-on subsystems like real-time clocks or wake-up receivers. |
| Shutdown Current | <1µA - enables deep-sleep modes in portable devices without compromising system-level energy budget. |
Pinout & Package
MAX8840ELT27+T 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 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 | Primary return path and thermal conduction node; must connect to large copper area 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 to OUT via 10nF capacitor to reduce output voltage noise; shorted to OUT during shutdown. |
| 5 N.C. | No Internal Connection | Not bonded or connected internally; leave unconnected and unpopulated on PCB footprint. |
| 6 OUT | Regulated 2.7V Output | Delivers regulated 2.7V; bypassed with 1µF ceramic capacitor to GND; high-impedance when SHDN is asserted. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 11µVRMS (100Hz–100kHz) with BP capacitor - enables clean power for RF synthesizers and precision analog front-ends. |
| High PSRR at audio frequencies | 78dB at 1kHz - rejects ripple from buck converter switching frequencies and their harmonics. |
| Stable with minimal capacitance | Guaranteed stability using only 1µF ceramic COUT - reduces BOM count and board area vs. traditional LDOs requiring ≥10µF. |
| p-Channel MOSFET pass element | 40µA ground current independent of load - eliminates base-drive losses seen in PNP-based regulators, improving battery runtime. |
| Integrated protection | Current limit (150–300mA) and thermal shutdown (160°C trip, 10°C hysteresis) - prevents damage during fault conditions without external components. |
Applications
| Cellular RF Front-End Power | Portable Audio DAC Supply |
|---|---|
Use Scenario: Powering VCOs, mixers, and low-noise amplifiers in GSM/UMTS/WCDMA transceivers where supply noise 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 phase noise degradation and maintain ACLR compliance under dynamic load. |
Use Scenario: Supplying stereo audio DACs and headphone amplifiers in Bluetooth headsets and portable media players requiring low THD+N and wide dynamic range. IC Role / Device Role / Timing Role: Clean 2.7V analog supply isolated from noisy digital domains and DC-DC converters. Use Value: Ultra-low noise floor preserves SNR >110dB and avoids audible hiss or distortion in high-fidelity playback paths. |
| Low-Power Sensor Signal Conditioning | Wearable Biometric Monitoring |
Use Scenario: Biasing precision op-amps, instrumentation amplifiers, and 16-bit+ SAR ADCs in industrial sensor nodes and IoT edge devices. IC Role / Device Role / Timing Role: Stable, low-drift 2.7V reference rail for analog signal acquisition stages sensitive to supply-induced offset and gain errors. Use Value: ±3% output accuracy over temperature and 0.003%/mA load regulation minimize calibration drift and improve measurement repeatability. |
Use Scenario: Powering optical heart-rate sensors (PPG), accelerometers, and ultra-low-power MCUs in compact wearable bands and patches. IC Role / Device Role / Timing Role: Primary regulated supply enabling sub-10µA sleep current and fast wake-up from shutdown (<300µs exit delay). Use Value: <1µA shutdown current extends battery life beyond 7 days on coin cells; 120mV dropout allows full utilization of 3.0V nominal Li-SOCl₂ cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79527DRVR | 2.7V fixed, 250mA output, 30µVRMS noise, 65dB PSRR @100kHz, SOT-23-5 package | Higher noise and lower PSRR than MAX8840ELT27+T; larger footprint and no BP pin for noise tuning | Select when higher output current is required and ultra-low noise is secondary; verify layout compatibility with SOT-23 thermal constraints. |
| MCP1703T-2702E/MB | 2.7V fixed, 250mA, 30µVRMS noise, 60dB PSRR @100kHz, SOT-23-5, 4µA quiescent current | Lower IQ but significantly higher output noise and reduced PSRR; lacks BP pin and thermal shutdown | Prefer for ultra-low-IQ battery monitoring circuits where noise sensitivity is minimal; not suitable for RF or high-precision analog use cases. |
Compared with TPS79527DRVR and MCP1703T-2702E/MB, the MAX8840ELT27+T delivers superior noise performance (11µVRMS) and PSRR (78dB @1kHz) in a smaller µDFN package, making it optimal for space- and noise-constrained RF/analog designs - though its 150mA rating requires careful load margining versus the 250mA alternatives.
Availability
MAX8840ELT27+T is available at Aetrix Electronics and suitable for cellular RF front-end power, portable audio DAC supply, and low-power sensor signal conditioning requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX8840ELT27+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 industrial, communications, and consumer applications.
The MAX8840 family was designed specifically for ultra-low-noise, high-PSRR power delivery in space-constrained portable electronics - targeting RF, audio, and precision analog subsystems where conventional LDOs introduce unacceptable noise coupling.
FAQ
What is the output voltage tolerance of the MAX8840ELT27+T over temperature and load?
The MAX8840ELT27+T guarantees ±3% output voltage accuracy across the full -40°C to +85°C operating temperature range and for load currents from 100µA to 80mA. At 25°C and 1mA load, typical deviation is ±1%. This tight tolerance ensures reliable operation of 2.7V I/O interfaces and analog circuitry without external trimming.
Does the MAX8840ELT27+T require an external bypass capacitor on the BP pin?
Yes - the MAX8840ELT27+T requires a 10nF capacitor between BP and OUT to achieve its specified 11µVRMS output noise. Omitting this capacitor increases noise to ~230µVRMS. The BP pin is internally shorted to OUT during shutdown, so the capacitor remains safe and functional across all states.
Can the MAX8840ELT27+T operate with input voltages below 2.7V?
No - the MAX8840ELT27+T requires a minimum input voltage of 2V, but stable regulation at 2.7V output demands VIN ≥ VOUT + dropout. With 120mV dropout at 120mA, the practical minimum input is 2.82V. Below this, output voltage sags and regulation is lost; operation below 2V risks violating absolute maximum ratings.
How does the shutdown functionality affect the output impedance of the MAX8840ELT27+T?
When SHDN is pulled low, the MAX8840ELT27+T disables its internal reference, error amplifier, and pass transistor, placing the OUT pin in a true high-impedance state - not just zero-voltage output. This allows safe sharing of the output rail with other regulators or back-driving scenarios without reverse-current issues or loading effects.
Is the MAX8840ELT27+T stable with ceramic capacitors having low ESR?
Yes - the MAX8840ELT27+T is explicitly designed and tested for stability with low-ESR ceramic capacitors, including 1µF X7R/X5R types. Unlike many older LDOs, it does not require added ESR or tantalum capacitors. Stability is maintained across the full 0.1Ω–100Ω ESR range per the "Region of Stable COUT ESR" graph in the datasheet.
MAX8840ELT27+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- 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):
- 2.7V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.135V @ 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-µDFN (1.5x1)
MAX8840ELT27+T FAQ
1.How can I place an order for MAX8840ELT27+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8840ELT27+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 MAX8840ELT27+T reliable?
The price and inventory of MAX8840ELT27+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8840ELT27+T is usually 5 days.
3.What payment methods are accepted for MAX8840ELT27+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8840ELT27+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8840ELT27+T?
MAX8840ELT27+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8840ELT27+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 MAX8840ELT27+T?
For technical support, including MAX8840ELT27+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8840ELT27+T requirements.
6.How does Aetrix verify that MAX8840ELT27+T is sourced from the original manufacturer or authorized distributors?
All MAX8840ELT27+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 MAX8840ELT27+T meets industry standards.
7.What is the process for return or replacement of MAX8840ELT27+T?
All MAX8840ELT27+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8840ELT27+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 MAX8840ELT27+T part is unused and in its original packaging.
Return procedure for MAX8840ELT27+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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