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Analog Devices Inc./Maxim Integrated MAX8840ELT25+T
- Part No.:
- MAX8840ELT25+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8840ELT25+T.pdf
- Description:
- IC REG LINEAR 2.5V 150MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,631
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Product details
Overview
MAX8840ELT25+T from Maxim Integrated is a preset 2.5V, 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 40µA ground current - designed for powering noise-sensitive analog circuitry in portable RF systems.
For engineers reviewing the MAX8840ELT25+T datasheet, MAX8840ELT25+T pinout, MAX8840ELT25+T application, or MAX8840ELT25+T equivalent, key selection criteria include its µDFN-6 package footprint, BP-capacitor–enabled noise suppression, shutdown current <1µA, and guaranteed stability with 1µF ceramic output capacitance across temperature.
Technical Context
The MAX8840ELT25+T employs a p-channel MOSFET pass transistor (typ. RDS(ON) = 1Ω) enabling low dropout and minimal quiescent current - unlike bipolar-based LDOs, it avoids base-drive losses and maintains 40µA ground current even under light loads. Its bandgap reference (1.225V) feeds an error amplifier that controls the pass gate via internal feedback.
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; this architecture delivers 11µVRMS output noise and 78dB PSRR at 1kHz - performance not shared by the MAX8841/MAX8842 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±3% over -40°C to +85°C - ensures stable biasing for ADC references and RF VCOs without external resistors. |
| Max Output Current | 150mA guaranteed minimum - supports moderate-power analog subsystems like Bluetooth transceivers or camera sensor interfaces. |
| Dropout Voltage | 120mV at 120mA load - enables operation down to VIN = 2.62V, extending usable battery life in single-cell Li-ion or Li-poly systems. |
| Output Noise | 11µVRMS (100Hz–100kHz) with 10nF BP capacitor - meets stringent spectral purity requirements for PLL power rails and audio DAC 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 sensor nodes and wearable devices. |
| Shutdown Current | <1µA - enables deep-sleep modes in battery-powered equipment without compromising wake-up latency. |
Pinout & Package
MAX8840ELT25+T is housed in a 1.5mm × 1.0mm × 0.8mm, 6-pin µDFN package with exposed thermal pad (pin 5 is NC, pin 4 is BP). The package supports high-density PCB layouts and efficient heat dissipation via GND-connected thermal land.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Unregulated Input Supply | Accepts 2V–6V input; requires ≥1µF ceramic bypass capacitor to suppress supply ripple and enable fast line transient response. |
| 2 (GND) | Ground Reference & Thermal Path | Primary return path for load current and internal circuitry; must connect to large copper area or ground plane for thermal management and noise control. |
| 3 (SHDN) | Active-Low Shutdown Control | Pull ≤0.4V to disable regulator; draws <0.01µA bias current - compatible with GPIOs of ultra-low-power MCUs. |
| 4 (BP) | Noise Bypass Terminal | Connects 10nF capacitor to OUT to reduce output voltage noise by filtering bandgap reference noise; shorted to OUT during shutdown. |
| 5 (NC) | No Connection | Not internally bonded; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress on die. |
| 6 (OUT) | Regulated Output | Delivers 2.5V ±3%; requires ≥1µF ceramic output capacitor for stability across all loads and temperatures (X5R/X7R dielectric recommended). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 11µVRMS (100Hz–100kHz) with 10nF BP cap - enables clean power for RF front-ends and precision data converters without additional filtering stages. |
| High PSRR at key frequencies | 78dB @ 1kHz, 54dB @ 100kHz - rejects noise from adjacent switching regulators, reducing need for ferrite beads or LC filters in compact layouts. |
| Stable with minimal capacitance | Guaranteed stability using only 1µF ceramic COUT - eliminates cost/size penalty of larger capacitors and simplifies BOM for space-constrained designs. |
| p-Channel MOSFET pass element | 1Ω typ. RDS(ON), zero base-drive current - achieves 40µA ground current and avoids saturation-related inefficiency seen in PNP-based LDOs. |
| Robust protection suite | Thermal shutdown (160°C trip, 10°C hysteresis) and current limiting (150–300mA range) - prevents damage during fault conditions without external components. |
Applications
| Bluetooth Transceiver Power | RF Front-End Biasing |
|---|---|
|
Use Scenario: Powering the VCC rail of a Bluetooth 5.0 radio IC in a wireless earbud. IC Role / Device Role / Timing Role: Low-noise 2.5V supply for RF synthesizer and PA bias, minimizing phase noise and EVM degradation. Use Value: 11µVRMS noise and 78dB PSRR prevent digital switching noise from degrading receiver sensitivity and transmit spectral mask compliance. |
Use Scenario: Supplying local oscillator (LO) buffers and mixer bias in a 2.4GHz Wi-Fi front-end module. IC Role / Device Role / Timing Role: Clean, stable 2.5V source for analog signal chain components requiring low jitter and high SNR. Use Value: 120mV dropout allows operation from partially discharged Li-ion cells while maintaining LO phase stability and mixer linearity. |
| Digital Camera Sensor Core | Portable Audio DAC Supply |
|
Use Scenario: Providing regulated power to CMOS image sensor analog core and column ADC in a compact action camera. IC Role / Device Role / Timing Role: Primary LDO for sensor pixel array and analog readout circuitry, rejecting noise from digital processor domain. Use Value: 1µF ceramic stability and 40µA quiescent current extend battery runtime without sacrificing image SNR or dark current performance. |
Use Scenario: Powering stereo audio DAC and headphone amplifier in a portable music player. IC Role / Device Role / Timing Role: Ultra-low-noise 2.5V rail for DAC reference and analog output stage, minimizing audible hiss and distortion. Use Value: 11µVRMS noise directly translates to >105dB THD+N floor, meeting Hi-Res Audio certification requirements without post-regulation filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B252MR-G | 2.5V fixed, 150mA, 120mV dropout, but 25µVRMS noise and no BP pin - lacks ultra-low-noise architecture. | Suitable for general-purpose analog rails where PSRR >65dB at 1kHz is not required. | Select when board space permits larger output caps and noise budget allows ~2× higher RMS noise than MAX8840ELT25+T. |
| Analog Devices ADP160AUJZ-2.5-R7 | 2.5V fixed, 150mA, 190mV dropout at 150mA, 20µVRMS noise, no BP pin, 1.8µA quiescent current - higher IQ and lower PSRR (65dB @ 1kHz). | Better suited for non-noise-critical digital I/O rails or MCU core supplies with relaxed transient response needs. | Choose if thermal design accommodates higher dropout and system-level noise filtering is already implemented upstream. |
Compared with XC6219B252MR-G and ADP160AUJZ-2.5-R7, the MAX8840ELT25+T uniquely delivers sub-12µVRMS noise with integrated BP-capacitor optimization - making it irreplaceable in RF and high-fidelity audio signal chains where noise floor directly impacts system-level specifications.
Availability
MAX8840ELT25+T is available at Aetrix Electronics and suitable for Bluetooth radios, Wi-Fi front-ends, digital camera sensors, and portable audio DACs requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for MAX8840ELT25+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 series belongs to Maxim's ultra-low-noise LDO product line, engineered specifically for powering sensitive RF, audio, and precision analog circuits in battery-operated portable devices where spectral purity and efficiency are co-optimized.
FAQ
What is the exact output voltage tolerance of the MAX8840ELT25+T over temperature and load?
The MAX8840ELT25+T guarantees ±3% output voltage accuracy over full operating conditions: -40°C to +85°C temperature range, 100µA to 80mA load current, and input voltage from (VOUT + 0.5V) to 6V. At room temperature and 1mA load, typical deviation is ±1%. This tight tolerance ensures reliable operation of 2.5V-dependent analog blocks without calibration overhead.
Can the MAX8840ELT25+T operate stably with a 0.47µF ceramic output capacitor?
No - the MAX8840ELT25+T is specified and guaranteed stable only with ≥1µF ceramic output capacitance (X5R or X7R dielectric). Using 0.47µF violates the minimum COUT requirement and risks oscillation, especially under varying load or temperature. The 1µF value ensures phase margin >45° across all conditions per the stability analysis in the datasheet.
Does the BP pin on the MAX8840ELT25+T require a specific capacitor type or voltage rating?
Yes - the BP pin requires a 10nF ceramic capacitor (X7R or C0G/NP0) rated for ≥6.3V, connected directly between BP and OUT. Capacitors with higher leakage (e.g., Y5V/Z5U) or insufficient voltage rating may degrade noise performance or cause reliability issues. The BP capacitor must be placed within 2mm of the MAX8840ELT25+T package to minimize parasitic inductance.
How does the MAX8840ELT25+T behave during shutdown, and what is the output state?
When SHDN is pulled low (<0.4V), the MAX8840ELT25+T disables its voltage reference, error amplifier, and pass transistor, reducing supply current to <1µA. The OUT pin enters a high-impedance state - it is neither driven nor clamped, so external pull-downs or loads determine its voltage. The BP pin is internally shorted to OUT during shutdown, discharging the BP capacitor safely.
Is the MAX8840ELT25+T pin-compatible with other variants in the MAX8840/MAX8841/MAX8842 family?
Yes - all three variants share identical 6-pin µDFN-6 (1.5mm × 1.0mm) packaging and pinout: IN, GND, SHDN, BP (or NC/FB), NC (or FB), OUT. However, functional compatibility requires verification: MAX8840ELT25+T uses BP for noise reduction, MAX8841ELT25+T has NC at pin 4, and MAX8842ELT+T uses FB at pin 4 for adjustable output - direct substitution is not electrically safe without circuit review.
MAX8840ELT25+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.5V
- 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)
MAX8840ELT25+T FAQ
1.How can I place an order for MAX8840ELT25+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8840ELT25+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 MAX8840ELT25+T reliable?
The price and inventory of MAX8840ELT25+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8840ELT25+T is usually 5 days.
3.What payment methods are accepted for MAX8840ELT25+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8840ELT25+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8840ELT25+T?
MAX8840ELT25+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8840ELT25+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 MAX8840ELT25+T?
For technical support, including MAX8840ELT25+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8840ELT25+T requirements.
6.How does Aetrix verify that MAX8840ELT25+T is sourced from the original manufacturer or authorized distributors?
All MAX8840ELT25+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 MAX8840ELT25+T meets industry standards.
7.What is the process for return or replacement of MAX8840ELT25+T?
All MAX8840ELT25+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8840ELT25+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 MAX8840ELT25+T part is unused and in its original packaging.
Return procedure for MAX8840ELT25+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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