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Analog Devices Inc./Maxim Integrated MAX8840ELT28+T
- Part No.:
- MAX8840ELT28+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8840ELT28+T.pdf
- Description:
- IC REG LINEAR 2.8V 150MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,776
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Product details
Overview
MAX8840ELT28+T from Maxim Integrated is a 2.8V preset, 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, achieves 40µA ground current, and operates from 2V to 6V input - ideal for powering RF sections and precision analog circuitry in portable wireless devices.
For engineers reviewing the MAX8840ELT28+T datasheet, MAX8840ELT28+T pinout, MAX8840ELT28+T application, or MAX8840ELT28+T equivalent, key selection criteria include its 2.8V fixed output, µDFN-6 (1.5mm × 1.0mm) package, BP-capacitor–enabled noise suppression, guaranteed ±3% output accuracy over load/temperature, and shutdown current <1µA - critical for battery life in space-constrained, noise-sensitive designs.
Technical Context
The MAX8840ELT28+T 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 ultra-low quiescent operation. Its dedicated BP pin connects to a 10nF capacitor to shunt high-frequency noise from the internal reference path, directly enabling the 11µVRMS noise performance.
Shutdown control is implemented through a logic-compatible SHDN pin (0.4V low / 1.5V high thresholds), disabling the reference, error amp, and gate drive to reduce supply current below 1µA. Thermal protection activates at +160°C with 10°C hysteresis, and current limiting ensures safe operation up to 300mA peak while guaranteeing ≥150mA continuous output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±3% (guaranteed over -40°C to +85°C, 100µA–80mA load) |
| Dropout Voltage | 120mV at 120mA load (enables operation down to VIN = 2.92V while maintaining regulation) |
| Output Noise | 11µVRMS (100Hz–100kHz bandwidth, measured with 10nF BP capacitor) |
| PSRR | 78dB at 1kHz, 54dB at 100kHz (rejects switching noise from adjacent DC/DC converters) |
| Ground Current | 40µA typical at light load; 220µA max in dropout (minimizes battery drain in standby) |
| Shutdown Current | <1µA (ensures negligible leakage during system sleep modes) |
| Input Voltage Range | 2V to 6V (supports single-cell Li-ion, dual-cell NiMH, and regulated 3.3V/5V rails) |
Pinout & Package
MAX8840ELT28+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 power dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Unregulated Input Supply | Accepts 2V–6V input; requires 1µF ceramic decoupling capacitor close to pin |
| 2 GND | Ground Reference & Thermal Path | Electrical return and primary heat conduction path; must connect to large PCB copper area |
| 3 SHDN | Active-Low Shutdown Control | Logic-compatible input (0.4V max low, 1.5V min high); pulls internal reference and pass gate offline when low |
| 4 BP | Noise Bypass Terminal | Connects to 10nF capacitor between BP and OUT to suppress reference noise; shorted to OUT in shutdown |
| 5 N.C. | No Connection | Not internally bonded; must remain unconnected on PCB |
| 6 OUT | Regulated Output | Delivers stable 2.8V; bypassed with 1µF ceramic capacitor to GND for stability across all loads |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 11µVRMS enables clean power for VCOs, ADCs, and RF front-ends without additional filtering |
| p-Channel MOSFET pass element | Eliminates base-drive current, ensuring 40µA ground current and consistent dropout behavior vs. load |
| Stable with minimal capacitance | Guaranteed stability using only 1µF ceramic output capacitor - reduces BOM count and board area |
| Integrated protection | Thermal shutdown (+160°C trip, 10°C hysteresis) and current limit (150mA min) prevent damage under fault conditions |
| Low shutdown current | <1µA disable state extends battery runtime in intermittent-operation systems like Bluetooth peripherals |
Applications
| RF Power Amplifier Bias Supply | Low-Noise Analog Signal Chain |
|---|---|
|
Use Scenario: Providing clean bias voltage to GaAs or SiGe PAs in Bluetooth/WLAN transceivers where supply ripple induces AM-to-PM distortion. IC Role / Device Role / Timing Role: Low-noise LDO supplying 2.8V PA bias rail, rejecting switching noise from shared PMIC outputs. Use Value: 11µVRMS noise and 78dB PSRR at 1kHz prevent EVM degradation; 120mV dropout extends usable battery range. |
Use Scenario: Powering high-resolution SAR ADCs and instrumentation amplifiers in portable medical sensors where supply noise corrupts microvolt-level signals. IC Role / Device Role / Timing Role: Precision analog supply rail with tight DC accuracy (±3%) and ultra-low broadband noise. Use Value: 11µVRMS noise floor preserves ENOB; 40µA quiescent current minimizes impact on sensor node battery life. |
| Portable Audio Codec Supply | Wireless Headset Baseband Core |
|
Use Scenario: Delivering regulated 2.8V to audio DACs and headphone drivers in compact personal stereos, where switching noise causes audible hiss. IC Role / Device Role / Timing Role: Dedicated low-noise supply isolating sensitive audio circuitry from noisy digital domains. Use Value: 54dB PSRR at 100kHz suppresses DC/DC ripple; BP capacitor option enables design margin against worst-case noise coupling. |
Use Scenario: Powering the baseband processor core in Bluetooth headsets requiring stable 2.8V during burst-mode RF transmission and deep-sleep states. IC Role / Device Role / Timing Role: Primary system LDO supporting dynamic voltage scaling and fast wake-up from sub-µA shutdown. Use Value: <1µA shutdown current and 300µs exit delay enable rapid transitions between active and idle modes without voltage droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B282MR-G | 2.8V fixed, 150mA, 120mV dropout, but 25µVRMS noise and no BP pin; SOT-25 package (2.9mm × 2.8mm) | Larger footprint; higher noise limits use in RF/analog sections; no bypass-capacitor optimization path | Select when board area allows larger package and noise requirements are less stringent than MAX8840ELT28+T. |
| Analog Devices ADP160ACBZ-2.8-R7 | 2.8V fixed, 150mA, 190mV dropout at 150mA, 22µVRMS noise, 65dB PSRR @ 1kHz; 5-ball WLCSP (1.0mm × 1.0mm) | Smaller package but higher dropout and lower PSRR reduce headroom and noise rejection in demanding RF apps | Choose for ultra-compact layouts where 190mV dropout and 22µVRMS noise are acceptable trade-offs. |
Compared with XC6219B282MR-G and ADP160ACBZ-2.8-R7, the MAX8840ELT28+T uniquely delivers the lowest noise (11µVRMS) and highest PSRR (78dB @ 1kHz) in a 1.5mm × 1.0mm footprint - making it the preferred choice for noise-critical RF and precision analog subsystems where performance outweighs minor size or cost differences.
Availability
MAX8840ELT28+T is available at Aetrix Electronics and suitable for cellular handsets, Bluetooth accessories, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX8840ELT28+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 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 electronics where PSRR, output noise, and quiescent current are critical.
FAQ
What is the output voltage tolerance of the MAX8840ELT28+T over temperature and load?
The MAX8840ELT28+T guarantees ±3% output voltage accuracy across the full operating temperature range (-40°C to +85°C) and load current range (100µA to 80mA). At +25°C and 1mA load, typical deviation is ±1%. This specification ensures reliable operation of downstream 2.8V logic and analog components without external trimming.
Does the MAX8840ELT28+T require an external bypass capacitor, and what value is recommended?
Yes - the MAX8840ELT28+T requires a 10nF capacitor connected between the BP pin and the OUT pin to achieve its specified 11µVRMS output noise. The BP pin is internally shorted to OUT during shutdown. Using values outside 1nF–100nF degrades noise performance; 10nF is the optimal value validated in the datasheet for minimum RMS noise.
Can the MAX8840ELT28+T be used with ceramic output capacitors smaller than 1µF?
No - the MAX8840ELT28+T is designed and guaranteed stable only with ≥1µF ceramic output capacitance (X7R or X5R dielectric recommended). Using smaller values risks oscillation or poor transient response. The 1µF requirement applies across all load conditions and temperatures, and is verified per the "Region of Stable COUT ESR vs. Load Current" curve in the datasheet.
What is the maximum input voltage rating for the MAX8840ELT28+T, and what happens above that limit?
The absolute maximum input voltage for the MAX8840ELT28+T is +7V relative to GND. Operation above this level may cause permanent damage. The recommended operating input range is 2V to 6V. Exceeding +7V violates Absolute Maximum Ratings and can degrade reliability even if immediate failure does not occur.
How does the shutdown functionality of the MAX8840ELT28+T affect output behavior?
When SHDN is pulled low (<0.4V), the MAX8840ELT28+T disables its internal voltage reference, error amplifier, and gate driver, placing the OUT pin in a high-impedance state with leakage current <1µA. The output voltage collapses rapidly (shutdown exit delay is ~300µs), and the device draws <1µA total supply current - preserving battery charge during system sleep.
MAX8840ELT28+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):
- 2.8V
- 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)
MAX8840ELT28+T FAQ
1.How can I place an order for MAX8840ELT28+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8840ELT28+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 MAX8840ELT28+T reliable?
The price and inventory of MAX8840ELT28+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8840ELT28+T is usually 5 days.
3.What payment methods are accepted for MAX8840ELT28+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8840ELT28+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8840ELT28+T?
MAX8840ELT28+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8840ELT28+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 MAX8840ELT28+T?
For technical support, including MAX8840ELT28+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8840ELT28+T requirements.
6.How does Aetrix verify that MAX8840ELT28+T is sourced from the original manufacturer or authorized distributors?
All MAX8840ELT28+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 MAX8840ELT28+T meets industry standards.
7.What is the process for return or replacement of MAX8840ELT28+T?
All MAX8840ELT28+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8840ELT28+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 MAX8840ELT28+T part is unused and in its original packaging.
Return procedure for MAX8840ELT28+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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