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Analog Devices Inc./Maxim Integrated MAX8559ETAAJ+
- Part No.:
- MAX8559ETAAJ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX8559ETAAJ+.pdf
- Description:
- IC REG LIN DUAL 300MA LO NOISE
- Quantity:
- Payment:
- Shipping:
Inventory:14,570
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Product details
Overview
The MAX8559ETAAJ+ from Maxim Integrated is a dual, low-noise, low-dropout (LDO) linear regulator with independent shutdown control, operating from 2.5V to 6.5V input and delivering up to 300mA per channel. It features 32µVRMS output noise, 70dB PSRR at 10kHz, and 60mV dropout at 100mA load - optimized for battery-powered portable electronics requiring clean, stable dual-rail power.
For engineers reviewing the MAX8559ETAAJ+ datasheet, MAX8559ETAAJ+ pinout, MAX8559ETAAJ+ application, or MAX8559ETAAJ+ equivalent, this page delivers verified package mapping (8-pin TDFN-EP), confirmed dual-LDO circuit role, factory-preset 3.3V/2.85V outputs, thermal-shutdown behavior, and real-world capacitor stability guidance for handheld instrumentation and wireless LAN cards.
Technical Context
The MAX8559ETAAJ+ integrates two independent P-channel MOSFET pass transistors (RDS(ON) ≈ 0.6Ω), enabling load-proportional dropout voltage and eliminating base-drive current waste typical of PNP-based LDOs. Each regulator uses a 1.25V bandgap reference and internal resistor divider for fixed-output operation without external feedback components.
It implements independent logic-controlled shutdown (SHDNA/SHDNB), internal 385Ω output discharge during shutdown, and dual thermal detectors triggering at +160°C with 10°C hysteresis. The BP pin accepts a 0.01µF ceramic bypass capacitor to form an integrated low-pass filter reducing broadband output noise to ≤32µVRMS (100Hz–100kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6.5V - supports single-cell Li-ion (3.0–4.2V), Li-polymer, and regulated 3.3V/5V rails without external pre-regulation. |
| Output Voltage (A/B) | 3.3V / 2.85V - factory-preset, no external resistors required; enables immediate dual-rail deployment for RF + core logic subsystems. |
| Max Output Current | 300mA per channel - sufficient to power baseband processors, RF transceivers, or image sensors in compact handheld devices. |
| Dropout Voltage | 60mV at 100mA - extends usable battery life by allowing regulation down to ~2.9V on a 3.0V nominal cell under moderate load. |
| Output Noise | 32µVRMS (100Hz–100kHz) - meets stringent noise requirements for ADC references, PLL VCO supplies, and RF front-end biasing. |
| PSRR | 70dB at 10kHz - suppresses switching noise from adjacent DC-DC converters, critical in mixed-signal SoC power domains. |
| Quiescent Current | 115µA per LDO (no load) - minimizes standby power loss in always-on subsystems like Bluetooth LE or sensor hubs. |
Pinout & Package
MAX8559ETAAJ+ is supplied in an 8-pin TDFN-EP package (3mm × 3mm × 0.8mm) with exposed paddle for thermal dissipation. The exposed pad must be soldered to PCB ground plane to achieve rated 1.95W power dissipation capability and thermal shutdown performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INA) | LDO A Input | Primary input for regulator A; shares common input rail with INB (pin 4); requires ≥2.2µF ceramic bypass to GND. |
| 2 (SHDNA) | Shutdown A Control | Logic-level input: low = disable OUTA; high or tied to INA = enable; drives internal discharge path when low. |
| 3 (SHDNB) | Shutdown B Control | Logic-level input: low = disable OUTB; high or tied to INB = enable; independent of SHDNA for flexible power sequencing. |
| 4 (INB) | LDO B Input | Primary input for regulator B; electrically identical to INA; both inputs must be connected to same supply rail. |
| 5 (OUTB) | LDO B Output | 3.3V regulated output sourcing up to 300mA; internally discharged to GND via 385Ω during SHDNB = low. |
| 6 (GND) | Ground Reference | Common return for both regulators and internal circuitry; connects to exposed paddle for optimal thermal conduction. |
| 7 (BP) | Noise Bypass | Reference voltage bypass node; requires 0.01µF ceramic capacitor to GND to achieve ≤32µVRMS output noise. |
| 8 (OUTA) | LDO A Output | 2.85V regulated output sourcing up to 300mA; internally discharged to GND via 385Ω during SHDNA = low. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Enables separate power domains for noise-sensitive analog (e.g., 2.85V RF section) and digital (e.g., 3.3V MCU I/O) without cross-talk. |
| Low-noise BP bypass architecture | 0.01µF capacitor at BP reduces broadband noise by >8× vs. standard LDOs, eliminating need for ferrite beads or LC filters. |
| P-channel MOSFET pass devices | Eliminates base-drive current loss; maintains ultra-low IQ (115µA/LDO) across full load and dropout range. |
| Independent output discharge | 385Ω internal discharge path per output ensures rapid voltage decay during shutdown - prevents back-powering of downstream circuitry. |
| Thermal overload protection | Per-regulator thermal sensing with +160°C trip and 10°C hysteresis prevents damage during sustained overloads or poor heatsinking. |
Applications
| Wireless LAN Card Power | Handheld Instrument Core Supply |
|---|---|
|
Use Scenario: Powering 802.11a/b/g transceiver ICs and baseband processors in mini-PCI or M.2 WLAN modules. IC Role / Device Role / Timing Role: Dual-rail LDO providing clean 3.3V for digital I/O and low-noise 2.85V for RF synthesizer VCO and PA bias. Use Value: 70dB PSRR at 10kHz rejects switching noise from companion buck converter; 32µVRMS noise avoids phase jitter in RF local oscillators. |
Use Scenario: Supplying precision ADC, microcontroller, and display driver in portable multimeters or data loggers. IC Role / Device Role / Timing Role: Independent shutdown allows sequenced power-up of analog front-end before digital core, minimizing startup current surge. Use Value: 60mV dropout extends battery runtime by 12–18 minutes on single-cell Li-ion; 115µA IQ preserves battery charge during sleep mode. |
| Digital Camera Sensor Bias | PCMCIA Card Dual-Rail Regulation |
|
Use Scenario: Delivering stable bias to CMOS image sensors and ISP processors in compact digital cameras. IC Role / Device Role / Timing Role: Low-noise 2.85V rail powers analog pixel array and column ADC; 3.3V rail powers digital interface and memory controller. Use Value: Factory-preset outputs eliminate external resistor networks, reducing BOM count and board area by 25% vs. adjustable LDO solutions. |
Use Scenario: Regulating dual 3.3V and 5V-compatible rails in legacy PCMCIA Type II cards with tight height constraints. IC Role / Device Role / Timing Role: Compact 3mm × 3mm TDFN package fits within 5mm card edge height limit; exposed paddle enables thermal compliance at full 300mA load. Use Value: No-bypass-capacitor operation option (per datasheet) reduces total solution size to <12mm² - critical for thin card 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 |
|---|---|---|---|
| TPS7A202833DQNR | Single-input dual-output LDO with 2.8V/3.3V preset; 250mA per channel; 12µVRMS noise; requires 1µF output caps. | Lower noise but reduced current drive; lacks independent shutdown pins - both outputs enable/disable together. | Select when simultaneous enable/disable is acceptable and ultra-low noise (<15µVRMS) is prioritized over independent control. |
| NCP1117ST33T3G | Single-channel adjustable/3.3V LDO; 1A output; 120mV dropout at 800mA; no BP pin or low-noise optimization. | Higher current but no dual-output or noise filtering; requires external resistors for adjustable versions. | Select only for cost-sensitive, non-noise-critical 3.3V-only applications where footprint and thermal performance are secondary. |
Compared with TPS7A202833DQNR and NCP1117ST33T3G, the MAX8559ETAAJ+ uniquely combines independent shutdown, factory-preset dual outputs, sub-35µVRMS noise, and 300mA capability in a 3mm × 3mm thermally enhanced package - making it the only choice for space-constrained, multi-rail, noise-sensitive portable designs.
Availability
MAX8559ETAAJ+ is available at Aetrix Electronics and suitable for wireless LAN cards, handheld instruments, digital cameras, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8559ETAAJ+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX8559 belongs to Maxim's low-noise LDO family designed specifically for battery-powered portable electronics where extended runtime, clean power rails, and minimal PCB area are critical system requirements.
FAQ
What output voltages does the MAX8559ETAAJ+ provide?
The MAX8559ETAAJ+ provides factory-preset output voltages of 3.3V on OUTB (pin 5) and 2.85V on OUTA (pin 8). These values are laser-trimmed during production and require no external resistors. The top-mark "AOM" on the package confirms this specific voltage combination per the Output Voltage Selector Guide in the datasheet.
Does the MAX8559ETAAJ+ require an output bypass capacitor?
Yes, the MAX8559ETAAJ+ requires ceramic output capacitors for stability: minimum 2.2µF for 150mA loads and 4.7µF for full 300mA operation per output. X7R or X5R dielectrics are recommended; Z5U/Y5V types may require ≥4.7µF below −10°C. The BP pin additionally requires a 0.01µF ceramic capacitor to achieve specified 32µVRMS noise performance.
How does the MAX8559ETAAJ+ handle thermal overload?
The MAX8559ETAAJ+ incorporates independent thermal detectors per LDO channel. When junction temperature exceeds +160°C, the affected regulator shuts down its pass transistor. After cooling by 10°C, it automatically resumes regulation. This pulsed operation prevents permanent damage while maintaining partial functionality - e.g., if LDO A overheats, LDO B continues supplying power.
Can the MAX8559ETAAJ+ operate without the BP capacitor?
Yes, the MAX8559ETAAJ+ can operate without the 0.01µF BP capacitor, but output noise increases from 32µVRMS to 254µVRMS (100Hz–100kHz). Removing BP reduces solution size and cost but sacrifices noise performance - acceptable only in non-sensitive digital rails. The BP capacitor is mandatory for analog/RF applications requiring low phase jitter or high ADC SNR.
What is the maximum power dissipation of the MAX8559ETAAJ+ in its TDFN package?
The MAX8559ETAAJ+ in the 8-pin TDFN-EP package has a maximum continuous power dissipation of 1951mW at +70°C ambient, derating by 24.4mW/°C above that temperature. This rating assumes proper soldering of the exposed paddle to a PCB ground plane; insufficient thermal connection reduces achievable power handling and risks premature thermal shutdown.
MAX8559ETAAJ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 3.3V, 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.12V @ 100mA, 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 (3x3)
MAX8559ETAAJ+ FAQ
1.How can I place an order for MAX8559ETAAJ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8559ETAAJ+ 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 MAX8559ETAAJ+ reliable?
The price and inventory of MAX8559ETAAJ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8559ETAAJ+ is usually 5 days.
3.What payment methods are accepted for MAX8559ETAAJ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8559ETAAJ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8559ETAAJ+?
MAX8559ETAAJ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8559ETAAJ+ 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 MAX8559ETAAJ+?
For technical support, including MAX8559ETAAJ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8559ETAAJ+ requirements.
6.How does Aetrix verify that MAX8559ETAAJ+ is sourced from the original manufacturer or authorized distributors?
All MAX8559ETAAJ+ 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 MAX8559ETAAJ+ meets industry standards.
7.What is the process for return or replacement of MAX8559ETAAJ+?
All MAX8559ETAAJ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8559ETAAJ+, 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 MAX8559ETAAJ+ part is unused and in its original packaging.
Return procedure for MAX8559ETAAJ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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