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Analog Devices Inc./Maxim Integrated MAX8559ETAJ1+T
- Part No.:
- MAX8559ETAJ1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX8559ETAJ1+T.pdf
- Description:
- IC REG LINEAR 2.85V/1.85V 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,536
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Product details
Overview
MAX8559ETAJ1+T from Maxim Integrated is a dual, low-noise, low-dropout linear regulator delivering 300mA per channel from 2.5V–6.5V input, with 32µVRMS output noise, 60mV dropout at 100mA, and independent logic-controlled shutdown for each LDO - deployed in battery-powered portable electronics requiring clean, compact dual-rail power.
For engineers reviewing the MAX8559ETAJ1+T datasheet, MAX8559ETAJ1+T pinout, MAX8559ETAJ1+T application, or MAX8559ETAJ1+T equivalent, key selection criteria include factory-preset dual outputs (2.85V/2.85V), TDFN-EP package thermal performance, PSRR of 70dB at 10kHz, and operation without mandatory bypass capacitor on BP.
Technical Context
The MAX8559ETAJ1+T integrates two independent P-channel MOSFET pass transistors (RDS(ON) ≈ 0.6Ω) with internal 1.25V bandgap reference and error amplifiers, enabling load-proportional dropout and ultra-low quiescent current (115µA per LDO). Its autodischarge circuitry pulls each output to GND via 385Ω during shutdown.
It features separate SHDNA/SHDNB inputs with 0.4V/1.6V logic thresholds, thermal shutdown at +160°C with 10°C hysteresis, and independent current limiting (310mA min per channel). The BP pin accepts a 0.01µF ceramic capacitor to form an RC filter that reduces broadband noise below 32µVRMS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6.5V - supports single-cell Li-ion, Li-poly, and multi-cell alkaline/NiMH battery inputs without external pre-regulation. |
| Output Voltage (per channel) | 2.85V (factory-preset, J1 code) - fixed dual-rail supply for core logic and I/O in portable SoC designs. |
| Max Output Current | 300mA per LDO - sufficient to power DSPs, RF transceivers, or camera modules with transient headroom. |
| Dropout Voltage | 60mV at 100mA load - extends usable battery life by maintaining regulation down to VIN = VOUT + 60mV. |
| Output Noise | 32µVRMS (100Hz–100kHz, with 0.01µF BP cap) - meets stringent noise requirements for ADC references and RF synthesizers. |
| PSRR | 70dB at 10kHz - suppresses switching noise from adjacent DC/DC converters feeding the same board. |
| Quiescent Current | 115µA per LDO (no load) - enables >1-year shelf life in always-on sensor nodes with periodic wake-up. |
Pinout & Package
MAX8559ETAJ1+T is housed in an 8-pin TDFN-EP package (3mm × 3mm × 0.8mm) with exposed paddle for thermal dissipation. Pin 1 is marked by a "+" sign on lead-free variants. The exposed paddle must be soldered to PCB ground plane for optimal thermal performance (RθJA = 41°C/W typical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INA) | LDO A Input | Shared input rail for both regulators; requires ≥2.2µF ceramic bypass to GND near pin. |
| 2 (SHDNA) | Shutdown A Control | Logic-low (≤0.4V) disables LDO A; internal 385Ω discharge path pulls OUTA to GND in shutdown. |
| 3 (SHDNB) | Shutdown B Control | Logic-low (≤0.4V) disables LDO B; independent control enables dynamic rail sequencing. |
| 4 (INB) | LDO B Input | Electrically tied to INA; dual-input structure simplifies layout but mandates common input filtering. |
| 5 (OUTB) | LDO B Output | Delivers up to 300mA; requires ≥2.2µF ceramic output capacitor; internally discharged during SHDNB assertion. |
| 6 (GND) | Analog/Digital Ground | Single ground reference for all circuitry; must connect directly to low-impedance PCB ground plane. |
| 7 (BP) | Noise Bypass Reference | Accepts 0.01µF ceramic cap to reduce high-frequency noise coupling into both LDO outputs. |
| 8 (OUTA) | LDO A Output | Delivers up to 300mA; identical specs to OUTB; shares same 2.85V preset as OUTB (J1 code). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent shutdown controls | Enables selective power gating of subsystems (e.g., disable camera LDO while keeping display LDO active) without firmware overhead. |
| Low 32µVRMS output noise | Eliminates need for post-LDO LC filtering in noise-sensitive analog signal chains, reducing BOM count and board area. |
| 115µA quiescent current per LDO | Supports >10-year battery life in low-duty-cycle IoT sensors when paired with deep-sleep MCU states. |
| 60mV dropout at 100mA | Extends operational time from Li-ion batteries down to 2.91V (2.85V + 60mV), capturing ~5% additional capacity. |
| Thermal shutdown with 10°C hysteresis | Prevents catastrophic failure under sustained overload; auto-recovery avoids system lockup during transient overloads. |
| Factory-preset 2.85V/2.85V outputs | Removes external feedback resistors, saving 4 passive components and eliminating resistor tolerance-induced voltage drift. |
Applications
| Cellular Handsets | Digital Cameras |
|---|---|
Use Scenario: Powering baseband processor core (1.8V) and RF transceiver (2.85V) from shared Li-ion battery. IC Role / Device Role / Timing Role: Dual-rail LDO providing isolated, low-noise supplies with independent enable control for power sequencing. Use Value: 32µVRMS noise prevents spurious emissions in cellular bands; 60mV dropout extends talk time by delaying brownout during battery sag. |
Use Scenario: Supplying image sensor analog front-end (2.85V) and digital controller (2.85V) in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Dual-output regulator delivering matched, low-noise rails with fast load-transient response (<15mV overshoot). Use Value: Independent shutdown allows sensor power-down between frames, cutting system quiescent current by 230µA. |
| Notebook Subsystems | Wireless LAN Cards |
Use Scenario: Generating 2.85V for PCIe interface logic and 2.85V for embedded controller in ultrabook add-in modules. IC Role / Device Role / Timing Role: Compact dual-LDO replacing discrete regulators to meet strict height and footprint constraints in M.2 slots. Use Value: 3mm × 3mm TDFN-EP package with exposed paddle achieves 1.95W power dissipation - sufficient for 300mA × 2 channels at 3.8V input. |
Use Scenario: Powering 802.11ac WLAN SoC (2.85V analog, 2.85V digital) in mini-PCIe cards with minimal PCB real estate. IC Role / Device Role / Timing Role: Dual LDO with integrated BP noise filter ensuring clean supply for RF PLLs and high-speed SerDes. Use Value: 70dB PSRR at 10kHz rejects noise from nearby switching regulators, preventing packet error rate degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6223D287MR-G | Single-channel, 200mA, 25µVRMS noise, SOT-25 package; no BP pin or independent shutdown. | Lacks dual output and independent control - requires two devices for same functionality, increasing footprint and cost. | Select only if single-rail, lower-current, or smaller package is prioritized over dual-channel integration. |
| Analog Devices ADP5052ACPZ-2-R7 | Dual-channel, 600mA/600mA, 12µVRMS noise, 24-lead LFCSP; includes I²C programmability and power-good flags. | Higher integration and precision at 3× price and 5× footprint; over-spec for cost-sensitive portable designs. | Choose when programmable outputs, higher current, or system monitoring (PGOOD) are required. |
Compared with XC6223D287MR-G, MAX8559ETAJ1+T delivers true dual-rail integration and independent shutdown in half the board area; versus ADP5052ACPZ-2-R7, it offers optimized cost, size, and simplicity for fixed-voltage portable power without sacrificing noise or thermal performance.
Availability
MAX8559ETAJ1+T is available at Aetrix Electronics and suitable for cellular handsets, digital cameras, notebook subsystems, and wireless LAN cards requiring stable component supply across extended production lifecycles.
Supply support for MAX8559ETAJ1+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 markets.
The MAX8559 belongs to Maxim's low-noise, low-quiescent-current LDO family designed specifically for space-constrained, battery-operated portable electronics where power integrity and solution size are critical.
FAQ
What output voltages does the MAX8559ETAJ1+T provide?
The MAX8559ETAJ1+T is factory-preset to deliver 2.85V on both OUTA and OUTB channels, as indicated by the "J1" suffix in the part number per Maxim's Output Voltage Selector Guide. This dual 2.85V configuration is optimized for powering matched analog/digital rails in portable SoCs and RF modules without external feedback components.
Does the MAX8559ETAJ1+T require an external bypass capacitor on the BP pin?
Yes - the MAX8559ETAJ1+T achieves its specified 32µVRMS output noise only when a 0.01µF low-leakage ceramic capacitor is placed between BP and GND. Omitting this capacitor increases output noise to 254µVRMS, making it unsuitable for noise-critical applications like RF synthesizers or high-resolution ADCs.
What is the thermal performance difference between the UCSP and TDFN packages for the MAX8559ETAJ1+T?
The MAX8559ETAJ1+T uses the TDFN-EP package (3mm × 3mm), which provides 1.95W maximum power dissipation and 41°C/W typical junction-to-ambient thermal resistance. In contrast, the UCSP variant (2mm × 1mm) is rated for only 379mW - making the TDFN essential for full 300mA-per-channel operation at elevated ambient temperatures.
Can the MAX8559ETAJ1+T operate without output capacitors?
No - the MAX8559ETAJ1+T requires minimum 2.2µF ceramic output capacitors on both OUTA and OUTB for stability across temperature and load. For 300mA operation, Maxim specifies ≥4.7µF output capacitance. Operating without them risks oscillation, poor transient response, and potential damage under load step changes.
How does the MAX8559ETAJ1+T handle short-circuit conditions?
The MAX8559ETAJ1+T incorporates independent current-limit circuitry per channel, tripping at 310mA (min) to protect against shorts. During sustained short-circuit, the device enters thermal shutdown at +160°C and cycles on/off with 10°C hysteresis - maintaining safe junction temperature without requiring external current-sense or foldback circuitry.
MAX8559ETAJ1+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 2.85V, 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 (3x3)
MAX8559ETAJ1+T FAQ
1.How can I place an order for MAX8559ETAJ1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8559ETAJ1+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 MAX8559ETAJ1+T reliable?
The price and inventory of MAX8559ETAJ1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8559ETAJ1+T is usually 5 days.
3.What payment methods are accepted for MAX8559ETAJ1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8559ETAJ1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8559ETAJ1+T?
MAX8559ETAJ1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8559ETAJ1+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 MAX8559ETAJ1+T?
For technical support, including MAX8559ETAJ1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8559ETAJ1+T requirements.
6.How does Aetrix verify that MAX8559ETAJ1+T is sourced from the original manufacturer or authorized distributors?
All MAX8559ETAJ1+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 MAX8559ETAJ1+T meets industry standards.
7.What is the process for return or replacement of MAX8559ETAJ1+T?
All MAX8559ETAJ1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8559ETAJ1+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 MAX8559ETAJ1+T part is unused and in its original packaging.
Return procedure for MAX8559ETAJ1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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