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Analog Devices Inc./Maxim Integrated MAX8866SEUA
- Part No.:
- MAX8866SEUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX8866SEUA.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:25,913
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Product details
Overview
MAX8866SEUA from Maxim Integrated is a dual, low-dropout linear regulator IC delivering two independent 2.84V fixed outputs (or adjustable 1.25V–5.5V) with up to 100mA per channel, 55mV dropout at 50mA, 105µA no-load supply current, and integrated auto-discharge on shutdown. It targets battery-powered portable systems requiring stable dual-rail power with minimal quiescent consumption.
For engineers reviewing the MAX8866SEUA datasheet, MAX8866SEUA pinout, MAX8866SEUA application, or MAX8866SEUA equivalent, key selection criteria include its dual-mode output configuration, thermal shutdown behavior, reverse-battery protection, and µMAX-8 package compatibility in space-constrained handheld designs.
Technical Context
The MAX8866SEUA integrates two independent P-channel MOSFET-based LDO regulators sharing a 1.25V bandgap reference and thermal sensor. Each channel features separate error amplifiers, MOSFET drivers, and Dual Mode™ comparators that select between internal fixed-voltage feedback (2.84V for 'S' variant) or external resistor-divider adjustment.
Unlike PNP-based regulators, its 1.1Ω typical RDS(ON) pass transistors eliminate base-drive current, enabling consistent 145µA operating supply current across load conditions-including dropout-and supporting active output discharge during shutdown-a feature exclusive to the MAX8866 family versus MAX8865.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.84V (fixed, 'S' variant), ±3% tolerance over -40°C to +85°C - ensures stable bias for 2.8V logic rails and analog subsystems. |
| Dropout Voltage | 55mV @ 50mA - enables operation down to VIN = 2.895V while maintaining regulation, extending usable battery life in single-cell Li-ion or alkaline systems. |
| No-Load Supply Current | 105µA - minimizes standby drain in always-on subsystems such as real-time clocks or wake-up circuitry. |
| Operating Supply Current | 145µA (at 200mA total load) - remains constant across dropout, light, and heavy loads due to PMOS architecture. |
| Output Noise | 350µVRMS (10Hz–1MHz) - suitable for powering noise-sensitive analog circuits including 12-bit ADCs without additional filtering. |
| Input Voltage Range | +2.5V to +5.5V - supports direct connection to single-cell Li-ion (3.0–4.2V), NiMH (2.4–3.6V), or regulated 3.3V/5V supplies. |
| Thermal Shutdown | Triggers at +170°C with +20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
MAX8866SEUA is housed in an 8-pin µMAX package (3.0mm × 3.0mm × 0.8mm, 0.65mm pitch), optimized for high-density portable PCB layouts. Thermal performance relies on soldering GND (Pin 3) to a large copper plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pin 1) | Regulator 1 output | Delivers up to 100mA at 2.84V; 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 suppress input ripple and source peak currents. |
| GND (Pin 3) | Power ground | Common return for both regulators and thermal reference; critical for thermal dissipation and noise control. |
| OUT2 (Pin 4) | Regulator 2 output | Independent 100mA 2.84V rail; shares no internal current path with OUT1-enables true dual-rail isolation. |
| SET2 (Pin 5) | Feedback input for OUT2 | Grounded for 2.84V fixed mode; connected to external resistor divider for adjustable output (1.25V–5.5V). |
| SET1 (Pin 6) | Feedback input for OUT1 | Identical function to SET2; allows independent configuration of each output (e.g., one fixed, one adjustable). |
| SHDN1 (Pin 7) | Active-low shutdown for OUT1 | Pulling low disables OUT1 and actively discharges it to GND (MAX8866-specific auto-discharge function). |
| SHDN2 (Pin 8) | Active-low shutdown for OUT2 | Independent control of OUT2; same auto-discharge behavior as SHDN1 when asserted. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ operation | Single-pin (SETx) selection between factory-trimmed 2.84V output or user-adjustable 1.25V–5.5V via external resistors-eliminates need for multiple SKUs or post-manufacture trimming. |
| Auto-discharge on shutdown | Active pull-down of OUT1/OUT2 to GND within 1ms when SHDN1/SHDN2 is asserted-prevents floating outputs and unintended biasing of downstream circuitry. |
| Reverse battery protection | Limits reverse supply current to <1mA if VIN or SHDNx falls below GND-protects battery and IC during incorrect insertion or fault conditions without external diodes. |
| Low-noise, low-PSRR architecture | 350µVRMS output noise and 60dB PSRR at DC–400Hz-reduces need for post-regulation filtering in RF front-ends and precision analog signal chains. |
| Thermal and current limiting | Integrated thermal shutdown (+170°C trigger) and per-channel current limit (~220mA typical)-enables robust operation under short-circuit or overload without external protection components. |
Applications
| Cellular Telephones | Cordless Telephones |
|---|---|
Use Scenario: Powering baseband processor core voltage and RF transceiver bias rails simultaneously from a single Li-ion cell. IC Role / Device Role / Timing Role: Dual-rail LDO providing isolated, low-noise 2.84V supplies for digital and RF sections with independent shutdown control. Use Value: Enables simultaneous power management of two critical subsystems while minimizing board area and eliminating discrete discharge paths. |
Use Scenario: Supplying DSP, audio codec, and display controller in DECT handsets with tight battery runtime requirements. IC Role / Device Role / Timing Role: Dual-output regulator delivering matched 2.84V rails with auto-discharge to prevent phantom current draw during sleep mode. Use Value: Extends standby time by reducing shutdown leakage to sub-nA levels and ensuring clean power sequencing. |
| PCMCIA Cards | Palmtop Computers |
Use Scenario: Providing regulated 2.84V I/O and core voltages for hot-pluggable PCMCIA peripherals operating from host 3.3V or battery sources. IC Role / Device Role / Timing Role: Dual LDO with reverse-battery protection and fast load-transient response to handle dynamic card insertion/removal events. Use Value: Prevents damage during misinsertion and maintains stable voltage during rapid load changes caused by interface negotiation. |
Use Scenario: Powering microcontroller, memory, and touchscreen controller in compact palmtop devices using a single-cell alkaline or Li-ion source. IC Role / Device Role / Timing Role: Dual 100mA LDO with ultra-low quiescent current (105µA no-load) and thermal protection for thermally constrained enclosures. Use Value: Delivers reliable dual-rail operation while maximizing battery life and avoiding thermal throttling in sealed form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8865SEUA | No auto-discharge function; identical pinout, specs, and package-but SHDN assertion only disables output without active discharge. | Suitable where output discharge is handled externally or unnecessary; lower cost where MAX8866-specific functionality is unused. | Select MAX8865SEUA only if auto-discharge is not required and BOM simplification is prioritized. |
| TSM1024IDT | Dual 150mA LDO in SO-8; fixed 3.3V/2.5V outputs; higher dropout (200mV @ 100mA); no reverse-battery protection. | Targets industrial or non-battery applications; lacks shutdown-controlled discharge and battery-reversal hardening. | Choose TSM1024IDT only for fixed 3.3V/2.5V dual-rail needs in non-portable systems with adequate headroom. |
Compared with MAX8866SEUA, MAX8865SEUA omits auto-discharge but matches all other electrical and mechanical specs, while TSM1024IDT trades battery-specific protections and low-noise performance for higher output current and fixed dual-voltage convenience in non-portable designs.
Availability
MAX8866SEUA is available at Aetrix Electronics and suitable for cellular telephones, cordless telephones, and palmtop computers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8866SEUA 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 demanding applications.
The MAX8866SEUA belongs to Maxim's low-dropout linear regulator product line, engineered specifically for battery-powered portable equipment requiring dual independent rails, ultra-low quiescent current, and robust fault protection.
FAQ
What output voltage does the MAX8866SEUA deliver?
The MAX8866SEUA delivers two independent 2.84V fixed outputs (±3% over temperature) when SET1 and SET2 are grounded. This 'S' variant is factory-trimmed for 2.84V; alternative versions (T/R) offer 3.15V or 2.80V. In adjustable mode, outputs range from 1.25V to 5.5V using external resistors.
Does the MAX8866SEUA support independent shutdown of each output?
Yes, the MAX8866SEUA provides fully independent shutdown control via SHDN1 (Pin 7) and SHDN2 (Pin 8). Asserting either pin low disables its respective regulator and-uniquely for the MAX8866 family-actively discharges the corresponding output to ground within 1ms.
How does the MAX8866SEUA protect against reverse battery connection?
The MAX8866SEUA incorporates integrated reverse battery protection that limits reverse current to less than 1mA if VIN or any SHDN pin falls below ground. This eliminates the need for external blocking diodes and prevents damage to both the IC and battery during incorrect installation.
What is the dropout voltage specification for the MAX8866SEUA?
The MAX8866SEUA has a dropout voltage of 55mV at 50mA load per channel, defined as the minimum VIN–VOUT differential needed to maintain regulation. Its P-channel MOSFET pass transistor ensures this low dropout is maintained across temperature and load conditions, including dropout operation.
Can the MAX8866SEUA be used in adjustable-output configurations?
Yes, the MAX8866SEUA supports adjustable outputs from 1.25V to 5.5V by connecting external resistor dividers to SET1 and SET2. The output voltage follows VOUT = 1.25V × (1 + R1/R2), with R2 recommended at 100kΩ for optimal accuracy and PSRR performance.
MAX8866SEUA 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 (2.84V)
- 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
MAX8866SEUA FAQ
1.How can I place an order for MAX8866SEUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8866SEUA 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 MAX8866SEUA reliable?
The price and inventory of MAX8866SEUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8866SEUA is usually 5 days.
3.What payment methods are accepted for MAX8866SEUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8866SEUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8866SEUA?
MAX8866SEUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8866SEUA 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 MAX8866SEUA?
For technical support, including MAX8866SEUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8866SEUA requirements.
6.How does Aetrix verify that MAX8866SEUA is sourced from the original manufacturer or authorized distributors?
All MAX8866SEUA 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 MAX8866SEUA meets industry standards.
7.What is the process for return or replacement of MAX8866SEUA?
All MAX8866SEUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX8866SEUA, 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 MAX8866SEUA part is unused and in its original packaging.
Return procedure for MAX8866SEUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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