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Analog Devices Inc./Maxim Integrated MAX8559ETAO1+
- Part No.:
- MAX8559ETAO1+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX8559ETAO1+.pdf
- Description:
- IC REG LIN 2.6/1.85V 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,428
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Product details
Overview
MAX8559ETAO1+ from Maxim Integrated is a dual, low-noise, low-dropout linear regulator delivering 300mA per channel with factory-preset outputs of 2.60V (OUTA) and 1.85V (OUTB), operating from 2.5V to 6.5V input. It features independent logic-controlled shutdown inputs (SHDNA/SHDNB), 32µVRMS output noise, 70dB PSRR at 10kHz, and 60mV dropout at 100mA - optimized for space-constrained battery-powered systems like digital cameras and handheld instruments.
For engineers reviewing the MAX8559ETAO1+ datasheet, MAX8559ETAO1+ pinout, MAX8559ETAO1+ application, or MAX8559ETAO1+ equivalent, key selection criteria include dual-output voltage pairing, UCSP/TDFN package compatibility, thermal shutdown behavior at +160°C, and bypass capacitor requirements for noise reduction (0.01µF at BP).
Technical Context
The MAX8559ETAO1+ integrates two independent P-channel MOSFET pass transistors (RDS(ON) ≈ 0.6Ω), enabling load-proportional dropout voltage and eliminating base-drive current loss typical of PNP-based regulators. Each LDO employs a 1.25V bandgap reference and internal resistor divider for fixed output setting without external feedback.
It supports independent shutdown control with 385Ω internal discharge paths on both outputs and autodischarge circuitry. Thermal protection operates per-regulator with +160°C trip point and 10°C hysteresis, while the exposed paddle in TDFN enhances thermal dissipation up to 1.95W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage (OUTA/OUTB) | 2.60V / 1.85V - factory-preset, no external resistors required |
| Max Output Current | 300mA per LDO - sustained with ≥4.7µF ceramic output capacitors |
| Dropout Voltage | 60mV at 100mA - enables operation near battery end-of-life (e.g., 2.66V input for 2.60V OUTA) |
| Output Noise | 32µVRMS (100Hz–100kHz) - reduced to <254µVRMS if BP bypass cap omitted |
| PSRR | 70dB at 10kHz - suppresses switching noise from upstream DC/DC converters |
| Quiescent Current | 115µA per LDO - constant across load and dropout, enabling long battery life |
| Shutdown Current | 0.01µA - achieved only when both SHDNA and SHDNB driven low |
Pinout & Package
MAX8559ETAO1+ is packaged in an 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed thermal pad. Pin 1 is marked by a "+" sign on lead-free variants. The exposed paddle must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INA) | LDO A Input | 2.5V–6.5V supply input; shared with INB; requires ≥2.2µF ceramic bypass to GND |
| 2 (SHDNA) | Shutdown A Control | Logic-low disables OUTA; internal 385Ω discharge path activates; VIH = 1.6V, VIL = 0.4V |
| 3 (SHDNB) | Shutdown B Control | Logic-low disables OUTB; independent of SHDNA; same threshold specs as SHDNA |
| 4 (INB) | LDO B Input | 2.5V–6.5V supply input; electrically tied to INA; same bypass requirement |
| 5 (OUTB) | LDO B Output | 1.85V regulated output; sources up to 300mA; discharged to GND via 385Ω in shutdown |
| 6 (GND) | Ground Reference | Common return for all circuits; connects to exposed paddle for thermal conduction |
| 7 (BP) | Noise Bypass Terminal | Accepts 0.01µF ceramic cap to reduce output noise; critical for achieving 32µVRMS spec |
| 8 (OUTA) | LDO A Output | 2.60V regulated output; sources up to 300mA; discharged to GND via 385Ω in shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Enables simultaneous power domains (e.g., core + I/O) with separate enable control and discharge |
| Low-noise regulation | 32µVRMS output noise with BP bypass cap - suitable for RF, ADC, and precision analog circuits |
| P-channel MOSFET pass devices | Eliminates base-drive current loss; achieves 60mV dropout at 100mA and ultra-low IQ (115µA/LDO) |
| Thermal-overload protection | +160°C per-regulator shutdown with 10°C hysteresis - prevents damage during sustained overload |
| No-bypass-capability mode | Operates stably without BP capacitor - reduces BOM count and board area when noise is non-critical |
Applications
| Digital Camera Power Management | Handheld Instrument Core/I/O Supply |
|---|---|
|
Use Scenario: Dual-rail power for image sensor (2.6V) and processor I/O (1.85V) in compact digital cameras. IC Role / Device Role / Timing Role: Provides low-noise, independently controllable voltage rails with fast load transient response (<15mV overshoot). Use Value: Enables clean analog imaging performance and reliable digital interface operation without external feedback components. |
Use Scenario: Powering microcontroller core (1.85V) and display driver (2.6V) in portable test equipment. IC Role / Device Role / Timing Role: Delivers stable, low-ripple supplies with independent shutdown to extend battery runtime during idle states. Use Value: Reduces system quiescent current to <0.01µA in full shutdown - critical for multi-week battery life. |
| PCMCIA Card Dual-Voltage Regulation | Wireless LAN Module Biasing |
|
Use Scenario: Generating 2.6V for card controller and 1.85V for memory interface in PCMCIA expansion cards. IC Role / Device Role / Timing Role: Supplies tightly regulated voltages with ±3% accuracy over -40°C to +85°C and 0.1–300mA load range. Use Value: Ensures interoperability across host platforms without requiring external trimming or calibration. |
Use Scenario: Biasing RF front-end (1.85V) and baseband processor (2.6V) in 802.11b/g modules. IC Role / Device Role / Timing Role: Rejects switching noise from shared DC/DC converter via 70dB PSRR at 10kHz. Use Value: Prevents EVM degradation and maintains WLAN link stability in noisy power environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2026PDBVR | Single 2.6V LDO (300mA), no dual output or independent shutdown; 16µVRMS noise; SOT-23-5 | Cannot replace MAX8559ETAO1+ in dual-rail designs; lacks OUTB and SHDNB | Select only if system requires single-rail 2.6V with lower noise and smaller footprint |
| ADP5311ACPZ-2-6-1-85-R7 | Dual LDO (2.6V/1.85V), 200mA per channel, 45µVRMS noise, 125µA IQ, 20-pin LFCSP | Lower output current limits and higher noise; larger package increases board area | Choose when ADI ecosystem integration or extended temperature range (-40°C to +125°C) is prioritized over current capability |
Compared with TPS7A2026PDBVR and ADP5311ACPZ-2-6-1-85-R7, the MAX8559ETAO1+ uniquely delivers matched 300mA dual outputs with independent shutdown, 32µVRMS noise, and TDFN/UCSP scalability - making it optimal for space-constrained, battery-powered dual-rail systems requiring high current and low noise.
Availability
MAX8559ETAO1+ is available at Aetrix Electronics and suitable for digital cameras, handheld instruments, PCMCIA cards, and wireless LAN modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8559ETAO1+ 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) designs high-performance analog and mixed-signal ICs for power management, sensing, and communication applications.
The MAX8559 belongs to Maxim's low-noise, low-IQ LDO family targeting portable battery-powered devices where dual-rail efficiency, small solution size, and noise-sensitive analog performance are critical.
FAQ
What are the factory-set output voltages for MAX8559ETAO1+?
The MAX8559ETAO1+ has fixed output voltages of 2.60V on OUTA and 1.85V on OUTB, as indicated by the "O1" suffix in the ordering code. These values are laser-trimmed during manufacturing and require no external resistors or configuration. The MAX8559ETAO1+ achieves ±3% output accuracy across -40°C to +85°C and 0.1mA–300mA load range, ensuring consistent rail generation without calibration.
Does MAX8559ETAO1+ require a bypass capacitor on the BP pin?
Yes, a 0.01µF ceramic capacitor on the BP pin is required to achieve the specified 32µVRMS output noise. Omitting it increases noise to 254µVRMS but allows reduction of total solution size and cost when noise sensitivity is low. The MAX8559ETAO1+ remains stable without the BP capacitor, though PSRR and noise performance degrade significantly above 10kHz.
How does the thermal shutdown function on MAX8559ETAO1+?
The MAX8559ETAO1+ features per-regulator thermal shutdown that triggers at +160°C junction temperature, turning off the affected LDO's pass transistor. After cooling by 10°C, the regulator automatically resumes operation - resulting in pulsed output under continuous overload. This protects the MAX8559ETAO1+ from permanent damage while maintaining partial functionality during transient thermal events.
Can MAX8559ETAO1+ operate without an output capacitor?
No, the MAX8559ETAO1+ requires minimum 2.2µF ceramic output capacitance per rail for stability at ≤150mA loads, and 4.7µF for full 300mA operation across the full temperature range. Tantalum capacitors are not recommended due to ESR and reliability concerns. Removing output capacitors causes oscillation and violates absolute maximum ratings for output short-circuit duration.
What is the maximum allowable input voltage for MAX8559ETAO1+?
The MAX8559ETAO1+ supports input voltages from 2.5V to 6.5V. Exceeding 6.5V risks permanent damage, as absolute maximum rating for INA/INB is +7V. At 6.5V input, power dissipation must be managed: for the TDFN package, PMAX = 1951mW at TA = +70°C (derated 24.4mW/°C above), limiting usable VIN based on (VIN − VOUT) × IOUT. For example, at 300mA load on both rails, VIN must stay ≤5.2V to avoid thermal shutdown.
MAX8559ETAO1+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 2.6V, 1.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.12V @ 100mA, -
- Current - Output:
- 300mA, 300mA
- Current - Quiescent (Iq):
- 290 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB ~ 54dB (10kHz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN-EP (3x3)
MAX8559ETAO1+ FAQ
1.How can I place an order for MAX8559ETAO1+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8559ETAO1+ 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 MAX8559ETAO1+ reliable?
The price and inventory of MAX8559ETAO1+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8559ETAO1+ is usually 5 days.
3.What payment methods are accepted for MAX8559ETAO1+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8559ETAO1+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8559ETAO1+?
MAX8559ETAO1+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8559ETAO1+ 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 MAX8559ETAO1+?
For technical support, including MAX8559ETAO1+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8559ETAO1+ requirements.
6.How does Aetrix verify that MAX8559ETAO1+ is sourced from the original manufacturer or authorized distributors?
All MAX8559ETAO1+ 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 MAX8559ETAO1+ meets industry standards.
7.What is the process for return or replacement of MAX8559ETAO1+?
All MAX8559ETAO1+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8559ETAO1+, 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 MAX8559ETAO1+ part is unused and in its original packaging.
Return procedure for MAX8559ETAO1+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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