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Analog Devices Inc./Maxim Integrated MAX8866REUA
- Part No.:
- MAX8866REUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX8866REUA.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:1,918
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Product details
Overview
MAX8866REUA from Maxim Integrated is a dual, low-dropout linear regulator IC delivering two independent 2.80V outputs at up to 100mA each, operating from +2.5V to +5.5V input. It features PMOS pass transistors (1.1Ω typical RDS(ON)), 55mV dropout at 50mA, 145µA operating supply current, and auto-discharge functionality on shutdown-designed for battery-powered portable systems including cellular phones and modems.
For engineers reviewing the MAX8866REUA datasheet, MAX8866REUA pinout, MAX8866REUA application, or MAX8866REUA equivalent, key selection criteria include fixed 2.80V dual-output configuration, µMAX-8 package compatibility, thermal shutdown (170°C trip), reverse battery protection (<1mA reverse current), and independent active-low shutdown with output discharge capability.
Technical Context
The MAX8866REUA integrates two independent LDO regulators sharing a 1.25V bandgap reference and thermal sensor, each with its own error amplifier, MOSFET driver, P-channel pass transistor, Dual Mode™ comparator, and current limiter. Its preset mode fixes both outputs to 2.80V via internal trimmed resistors when SET1/SET2 are grounded.
Unlike PNP-based regulators, it uses P-channel MOSFETs eliminating base-drive current-enabling stable 145µA quiescent current across load, dropout, and temperature conditions. The MAX8866 variant adds auto-discharge circuitry that actively pulls OUT1/OUT2 to GND during SHDN1/SHDN2 assertion, distinguishing it from the MAX8865.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.80V per channel (±3% over -40°C to +85°C); enables direct replacement of 2.8V rails without external feedback components. |
| Max Output Current | 100mA per regulator; supports dual-rail powering of RF front-ends and baseband ICs in handheld instruments. |
| Dropout Voltage | 55mV at 50mA load; allows operation down to VIN = 2.855V while maintaining regulation-critical for Li-ion battery end-of-life extension. |
| Quiescent Current | 145µA total at 200mA combined load; sustains ultra-low power consumption even in dropout, extending battery life in standby modes. |
| Output Noise | 350µVRMS (10Hz–1MHz); suitable for noise-sensitive analog sections like ADC references in palmtop computers. |
| Thermal Shutdown | 170°C trip with 20°C hysteresis; protects against sustained overload in compact PCMCIA card enclosures with limited airflow. |
| Reverse Battery Protection | Limits reverse current to <1mA when VIN or SHDN pins go below GND; prevents battery drain and IC damage in misinserted battery scenarios. |
Pinout & Package
MAX8866REUA is housed in an 8-pin µMAX package (3.05mm × 3.05mm × 0.8mm), optimized for space-constrained portable designs. Thermal pad soldering to PCB ground plane is recommended for maximum power dissipation (θJA = 244°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pin 1) | Regulator 1 output | Sources up to 100mA at fixed 2.80V; requires 1µF ceramic bypass to GND for stability and transient response. |
| IN (Pin 2) | Input supply | Accepts +2.5V to +5.5V; must be bypassed with 2µF ceramic capacitor to minimize input ripple and improve PSRR. |
| GND (Pin 3) | Power ground | Common return path for both regulators and thermal sensor; must connect to large copper area for thermal management. |
| OUT2 (Pin 4) | Regulator 2 output | Independent 2.80V/100mA output; identical specs to OUT1; enables dual-rail isolation for noise-sensitive subsystems. |
| SET2 (Pin 5) | Feedback select for OUT2 | Grounded to enable 2.80V fixed output; floating or externally biased for adjustable mode (1.25V–5.5V). |
| SET1 (Pin 6) | Feedback select for OUT1 | Grounded to enable 2.80V fixed output; same function as SET2-both pins tied to GND for MAX8866REUA operation. |
| SHDN1 (Pin 7) | Active-low shutdown for OUT1 | Pulls OUT1 to GND when asserted (auto-discharge); connects to IN for normal operation. |
| SHDN2 (Pin 8) | Active-low shutdown for OUT2 | Pulls OUT2 to GND when asserted (auto-discharge); independent control enables staggered power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ operation | Enables either factory-trimmed 2.80V outputs (SETx = GND) or adjustable 1.25V–5.5V outputs (external resistor divider), reducing BOM count across product variants. |
| Auto-discharge on shutdown | Actively discharges OUT1/OUT2 to GND within 1ms when SHDN1/SHDN2 is asserted-prevents floating voltage on powered-down circuits in cellular phone baseband sections. |
| P-channel MOSFET pass devices | 1.1Ω typical RDS(ON) eliminates base-drive current, enabling consistent 145µA supply current regardless of load or dropout condition-ideal for always-on modem subsystems. |
| Reverse battery protection | Blocks reverse current to <1mA when VIN or SHDN pins fall below GND-protects primary battery cells and prevents thermal runaway in cordless telephone battery compartments. |
| Independent shutdown control | SHDN1 and SHDN2 operate separately, allowing dynamic power gating of individual rails (e.g., disabling RF section while keeping baseband active) without software coordination. |
Applications
| Cellular Telephones | Cordless Telephones |
|---|---|
|
Use Scenario: Powering RF transceiver and baseband processor from single Li-ion cell with tight voltage margin. IC Role / Device Role / Timing Role: Dual LDO providing isolated 2.80V rails-one for low-noise RF VCO bias, one for digital baseband core logic. Use Value: 55mV dropout extends usable battery life by ~12% compared to 100mV-dropout regulators, delaying brownout during deep discharge. |
Use Scenario: Supplying DSP and audio codec in DECT handsets with reverse-polarity battery insertion risk. IC Role / Device Role / Timing Role: Dual 2.80V regulator with reverse battery protection and independent shutdown for power sequencing. Use Value: <1mA reverse leakage prevents battery drain during accidental reverse insertion-eliminating field returns due to dead batteries. |
| Modems | Palmtop Computers |
|
Use Scenario: Providing clean, regulated power to UART interface and line-driver ICs in embedded dial-up modems. IC Role / Device Role / Timing Role: Dual LDO delivering low-noise 2.80V supplies with 350µVRMS noise for analog signal integrity. Use Value: Low output noise ensures <0.5 LSB error in 12-bit ADCs used for line-quality monitoring, improving connection reliability. |
Use Scenario: Powering SRAM and real-time clock in memory-retention mode during suspend-to-RAM. IC Role / Device Role / Timing Role: One regulator powers SRAM (OUT1), the other powers RTC (OUT2), both shut down independently via SHDN pins. Use Value: 145µA total quiescent current enables >30-day battery hold-up time in palmtop suspend mode using standard coin-cell backup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8865REUA | No auto-discharge; identical pinout, 2.80V outputs, and electrical specs except SHDN behavior. | Cannot actively discharge outputs-requires external discharge FETs if fast rail collapse is needed. | Select when auto-discharge is unnecessary and cost minimization is critical; shares same footprint and layout. |
| TSM102ACD | Dual op-amp + dual reference IC; not a regulator-requires external pass transistors and feedback networks. | Higher design complexity, larger board area, and no integrated thermal/reverse protection. | Choose only for custom LDO designs requiring programmable output or higher current; not a drop-in replacement. |
Compared with MAX8866REUA, MAX8865REUA offers identical regulation performance but lacks auto-discharge-making it suitable for simpler power domains where controlled rail collapse isn't required. TSM102ACD demands significant external circuitry and validation effort, limiting its use to highly specialized analog power architectures.
Availability
MAX8866REUA is available at Aetrix Electronics and suitable for cellular telephones, cordless telephones, and modems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for production programs.
Supply support for MAX8866REUA 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 MAX886x family was designed specifically for battery-powered portable equipment-emphasizing ultra-low quiescent current, small footprint, and robust protection features in µMAX packaging for space- and energy-constrained devices.
FAQ
What is the output voltage tolerance of the MAX8866REUA over temperature?
The MAX8866REUA delivers 2.80V outputs with ±3% tolerance across the full operating range of -40°C to +85°C. This specification is guaranteed by production testing and applies to both OUT1 and OUT2 simultaneously when SET1 and SET2 are grounded-ensuring consistent rail matching for dual-supply analog circuits in handheld instruments.
Does the MAX8866REUA support adjustable output voltages?
Yes, the MAX8866REUA supports adjustable outputs from 1.25V to 5.5V via external resistor dividers connected to SET1 and SET2. However, the "R" suffix denotes factory-trimmed 2.80V operation-so adjustable mode requires disconnecting SET1/SET2 from GND and adding precision resistors per the VOUT = 1.25V × (1 + R1/R2) equation. Fixed-mode use is default and recommended for MAX8866REUA.
How does the auto-discharge function work in the MAX8866REUA?
When SHDN1 or SHDN2 is pulled low, the MAX8866REUA activates internal discharge switches between OUT1 or OUT2 and GND, collapsing the respective output voltage to ground within 1ms. This prevents residual voltage from interfering with downstream logic states during power-down sequences in cellular telephone baseband sections.
What is the maximum allowable input voltage for the MAX8866REUA?
The MAX8866REUA supports input voltages from +2.5V to +5.5V under normal operation. Its absolute maximum rating is +6V on the IN pin relative to GND. Exceeding +5.5V may degrade long-term reliability or trigger thermal shutdown, especially at high ambient temperatures-so 5.5V is the practical upper limit for continuous operation.
Can the MAX8866REUA be used in automotive applications?
The MAX8866REUA is specified for -40°C to +85°C operation and includes thermal shutdown and reverse battery protection-features beneficial in automotive cabin environments. However, it is not AEC-Q100 qualified, lacks extended temperature grade (-40°C to +125°C), and has no automotive-specific qualification documentation. Use in non-safety-critical infotainment peripherals is possible with system-level validation, but not recommended for engine bay or ADAS applications.
MAX8866REUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V (2.8V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.12V @ 50mA, 0.12V @ 50mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 270 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX8866REUA FAQ
1.How can I place an order for MAX8866REUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8866REUA 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 MAX8866REUA reliable?
The price and inventory of MAX8866REUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8866REUA is usually 5 days.
3.What payment methods are accepted for MAX8866REUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8866REUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8866REUA?
MAX8866REUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8866REUA 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 MAX8866REUA?
For technical support, including MAX8866REUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8866REUA requirements.
6.How does Aetrix verify that MAX8866REUA is sourced from the original manufacturer or authorized distributors?
All MAX8866REUA 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 MAX8866REUA meets industry standards.
7.What is the process for return or replacement of MAX8866REUA?
All MAX8866REUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX8866REUA, 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 MAX8866REUA part is unused and in its original packaging.
Return procedure for MAX8866REUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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