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Analog Devices Inc./Maxim Integrated MAX8840ELT30+T
- Part No.:
- MAX8840ELT30+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8840ELT30+T.pdf
- Description:
- IC REG LINEAR 3V 150MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
MAX8840ELT30+T from Maxim Integrated is a 3.0V 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 - designed for powering noise-sensitive analog circuitry in portable RF systems.
For engineers reviewing the MAX8840ELT30+T datasheet, MAX8840ELT30+T pinout, MAX8840ELT30+T application, or MAX8840ELT30+T equivalent, key selection criteria include guaranteed 3.0V ±3% output accuracy over load/temperature, 40µA ground current at light load, shutdown current <1µA, stability with 1µF ceramic output capacitor, and µDFN-6 (1.5mm × 1.0mm) package compatibility with space-constrained PCB layouts.
Technical Context
The MAX8840ELT30+T employs a p-channel MOSFET pass transistor (typ. RDS(ON) = 1Ω) enabling low dropout and minimal quiescent current without base-drive losses. Its bandgap reference (1.225V) feeds an error amplifier that controls the pass gate via internal feedback, achieving tight regulation across line, load, and temperature.
Noise suppression relies on a dedicated BP pin connected to a 10nF capacitor between BP and OUT, enabling 11µVRMS output noise by shunting high-frequency noise from the reference path. 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 3.0V ±3% over 100µA–80mA load and -40°C to +85°C - ensures stable bias for ADCs, VCOs, and RF front-ends without external resistors. |
| Dropout Voltage | 120mV at 120mA load - enables operation down to VIN = 3.12V, 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 spectral purity requirements for PLLs, audio codecs, and precision sensors. |
| PSRR | 78dB at 1kHz, 54dB at 100kHz - suppresses switching noise from DC-DC converters feeding intermediate supply rails in mixed-signal SoCs. |
| Ground Current | 40µA typical at no load, 220µA in dropout - minimizes standby power loss in always-on subsystems like Bluetooth LE receivers. |
| Shutdown Current | <1µA - supports deep-sleep modes in portable devices without compromising wake-up latency (exit delay <300µs). |
| Stability | Guaranteed with 1µF ceramic output capacitor (X7R/X5R) - eliminates need for large tantalum or electrolytic caps, reducing BOM cost and board area. |
Pinout & Package
MAX8840ELT30+T is housed in a lead-free 6-pin µDFN package measuring 1.5mm × 1.0mm × 0.8mm, with exposed thermal pad (GND-connected) for enhanced heat dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Unregulated input supply | Accepts 2V–6V input; requires 1µF ceramic bypass to GND for EMI filtering and transient response. |
| 2 GND | Power and thermal ground | Primary return path for load current and thermal conduction path; must connect to large copper pour or ground plane. |
| 3 SHDN | Active-low enable control | Pull ≤0.4V to disable regulator (OUT high-Z); pull ≥1.5V for normal operation; input bias current <0.1µA. |
| 4 BP | Noise bypass terminal | Connects to 10nF capacitor between BP and OUT; reduces output voltage noise by filtering reference path; shorted to OUT during shutdown. |
| 5 N.C. | No internal connection | Not bonded; must remain unconnected - floating or tied to GND/IN degrades noise performance or causes malfunction. |
| 6 OUT | Regulated 3.0V output | Delivers up to 150mA; requires 1µF ceramic capacitor to GND; output impedance remains low across 10Hz–1MHz for dynamic load support. |
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 synthesizers and high-resolution data converters. |
| High PSRR at RF frequencies | 54dB rejection at 100kHz - mitigates coupling from switch-mode power supplies operating near IF/RF bands in wireless transceivers. |
| Low dropout with p-MOSFET | 120mV dropout at 120mA using 1Ω RDS(ON) pass device - avoids saturation losses seen in PNP-based LDOs, preserving battery runtime. |
| Minimal external components | Only IN, OUT, and BP capacitors required - eliminates feedback resistors, compensation networks, or bypass inductors needed by competing regulators. |
| Robust protection suite | Thermal shutdown (160°C trip, 10°C hysteresis) and current limit (150–300mA) - enables safe operation under fault conditions without external circuitry. |
Applications
| Bluetooth Audio Transceiver | Portable Medical Sensor Node |
|---|---|
|
Use Scenario: Powers RF transceiver IC and audio DAC in battery-operated Bluetooth earbuds requiring clean 3.0V supply. IC Role / Device Role / Timing Role: Low-noise LDO supplying VDD_RF and VDD_DAC rails; replaces noisy switching converter outputs. Use Value: 11µVRMS noise prevents audible hiss and RF desensitization; 78dB PSRR isolates DAC from digital switching noise. |
Use Scenario: Supplies analog front-end (AFE) and low-power MCU in wearable ECG patch with multi-day battery life. IC Role / Device Role / Timing Role: Primary 3.0V power rail for precision instrumentation amplifier and SAR ADC. Use Value: ±3% output accuracy maintains ADC reference ratio integrity; 40µA ground current extends sleep-mode battery life. |
| Wireless LAN Baseband Processor | Digital Camera Image Signal Processor |
|
Use Scenario: Provides regulated 3.0V to WLAN baseband SoC in compact IoT gateway, co-located with Wi-Fi/Bluetooth radios. IC Role / Device Role / Timing Role: Clean post-regulator for sensitive PLL and clock recovery circuits. Use Value: 120mV dropout allows direct use of 3.3V buck output; 54dB PSRR at 100kHz suppresses adjacent-band switching interference. |
Use Scenario: Powers CMOS image sensor and ISP core in ultra-thin digital camera where board space limits capacitor count. IC Role / Device Role / Timing Role: Compact 3.0V source for sensor analog bias and ISP I/O banks. Use Value: Stable with 1µF X7R ceramic capacitor - eliminates need for larger 4.7µF tantalum, saving 60% PCB area in 0402 footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B302MR-G | 3.0V fixed, 150mA, 250mV dropout at 100mA, 45µVRMS noise, SOT-25 package (2.9mm × 2.8mm) | Larger footprint, higher dropout, 4× higher output noise - suitable only where noise sensitivity is relaxed and board area permits. | Select when cost is primary constraint and PSRR/noise specs allow 45µVRMS and 250mV dropout. |
| Analog Devices ADP125ARHZ-3.0-R7 | 3.0V fixed, 500mA, 135mV dropout at 500mA, 40µVRMS noise, 6-lead LFCSP (2mm × 2mm) | Higher current capability but 3.6× higher noise and 2.3× larger package - trades noise performance for drive strength. | Select only if >150mA load current is required and 40µVRMS noise is acceptable for the signal chain. |
Compared with XC6219B302MR-G and ADP125ARHZ-3.0-R7, the MAX8840ELT30+T delivers the lowest output noise (11µVRMS) in the smallest footprint (1.5mm × 1.0mm), making it uniquely suited for space- and noise-critical RF and precision analog applications where 150mA capacity is sufficient.
Availability
MAX8840ELT30+T is available at Aetrix Electronics and suitable for Bluetooth audio transceivers, portable medical sensor nodes, wireless LAN baseband processors, and digital camera image signal processors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8840ELT30+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer markets.
The MAX8840 series was developed specifically for ultra-low-noise, high-PSRR power regulation in space-constrained portable RF and precision analog systems - targeting cellular infrastructure, wireless accessories, and battery-powered instrumentation.
FAQ
What is the exact output voltage tolerance of the MAX8840ELT30+T over temperature and load?
The MAX8840ELT30+T guarantees ±3% output voltage accuracy across the full operating range: -40°C to +85°C ambient temperature and 100µA to 80mA load current. At +25°C and 1mA load, typical deviation is ±1%. This specification ensures reliable biasing for 3.0V-tolerant analog circuits without external trimming.
Can the MAX8840ELT30+T operate stably with a 0.47µF ceramic output capacitor?
No - the MAX8840ELT30+T requires a minimum 1µF ceramic output capacitor (X7R or X5R dielectric) for guaranteed stability across all loads and temperatures. Using 0.47µF risks oscillation or poor transient response, especially below -10°C with Z5U/Y5V dielectrics. The datasheet explicitly specifies 1µF as the minimum stable value.
Does the BP pin on the MAX8840ELT30+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 leakage >10nA degrade noise performance. Values outside 1nF–100nF are not recommended; 10nF delivers optimal 11µVRMS noise per characterization data.
What is the maximum continuous input voltage the MAX8840ELT30+T can withstand?
The MAX8840ELT30+T has an absolute maximum input voltage of +7V relative to GND. However, for reliable operation within specifications, the input must remain within 2V to 6V. Exceeding 6V violates the recommended operating conditions and may cause parametric degradation or premature failure, even if below the 7V absolute limit.
How does the shutdown function affect the output impedance of the MAX8840ELT30+T?
When SHDN is pulled low, the MAX8840ELT30+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. Measured output impedance exceeds 10MΩ, preventing back-driving or loading of downstream circuitry during system sleep modes.
MAX8840ELT30+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):
- 3V
- 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 (1.5x1.0)
MAX8840ELT30+T FAQ
1.How can I place an order for MAX8840ELT30+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8840ELT30+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 MAX8840ELT30+T reliable?
The price and inventory of MAX8840ELT30+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8840ELT30+T is usually 5 days.
3.What payment methods are accepted for MAX8840ELT30+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8840ELT30+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8840ELT30+T?
MAX8840ELT30+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8840ELT30+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 MAX8840ELT30+T?
For technical support, including MAX8840ELT30+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8840ELT30+T requirements.
6.How does Aetrix verify that MAX8840ELT30+T is sourced from the original manufacturer or authorized distributors?
All MAX8840ELT30+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 MAX8840ELT30+T meets industry standards.
7.What is the process for return or replacement of MAX8840ELT30+T?
All MAX8840ELT30+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8840ELT30+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 MAX8840ELT30+T part is unused and in its original packaging.
Return procedure for MAX8840ELT30+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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