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Analog Devices Inc./Maxim Integrated MAX8559ETADK+T
- Part No.:
- MAX8559ETADK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX8559ETADK+T.pdf
- Description:
- IC REG LINEAR 3.15V/2.8V 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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Product details
Overview
MAX8559ETADK+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 - used in space-constrained portable electronics requiring clean, stable dual-rail power.
For engineers reviewing the MAX8559ETADK+T datasheet, MAX8559ETADK+T pinout, MAX8559ETADK+T application, or MAX8559ETADK+T equivalent, key selection criteria include factory-preset dual-output voltage (2.85V/1.80V per this variant), TDFN-EP package thermal performance, low quiescent current (115µA per LDO), and absence of required bypass capacitor for minimal BOM count.
Technical Context
The MAX8559ETADK+T integrates two independent P-channel MOSFET pass transistors (0.6Ω RDS(ON)) with internal 1.25V bandgap reference and error amplifiers, enabling load-dependent dropout and ultra-low quiescent current independent of load or dropout voltage. Each LDO features autodischarge via 385Ω internal resistor during shutdown.
It employs separate SHDNA/SHDNB inputs to control regulator A/B independently or jointly, reducing supply current to 0.01µA when both are low. The BP pin accepts a 0.01µF ceramic capacitor to form an RC filter that suppresses reference noise, directly enabling the 32µVRMS output noise specification.
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), 3.3V rails, and regulated 5V supplies without external pre-regulation. |
| Output Current per LDO | 300mA continuous - sufficient to power core logic, RF ICs, or sensors in handheld devices without external boost or parallel regulation. |
| Dropout Voltage | 60mV at 100mA - enables >98% efficiency at light loads and extends usable battery life near end-of-discharge in 2.85V/1.80V systems. |
| Output Noise | 32µVRMS (100Hz–100kHz) - meets stringent analog/RF supply requirements without additional LC filtering or ferrite beads. |
| PSRR | 70dB at 10kHz - rejects switching noise from adjacent DC/DC converters, critical for ADC references and audio codecs. |
| Quiescent Current | 115µA per LDO - ensures <230µA total system standby current when both outputs active, preserving battery shelf life. |
| Shutdown Current | 0.01µA with both SHDN pins low - enables true zero-power sleep modes in always-on sensor nodes or wake-on-event architectures. |
Pinout & Package
MAX8559ETADK+T is packaged in an 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed thermal pad. The package supports 1.95W power dissipation and requires soldering the EP pad to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA / INB | LDO A & B Input | Shared input pins accepting 2.5V–6.5V; must be bypassed with ≥2.2µF ceramic capacitor to GND for stability and line transient rejection. |
| OUTA / OUTB | LDO A & B Output | Each sources up to 300mA; internally discharged to GND via 385Ω resistor during shutdown to prevent floating bias in downstream circuitry. |
| SHDNA / SHDNB | Independent Shutdown Control | Logic-low disables corresponding LDO; driving both low shuts down entire IC and reference, reducing IQ to 0.01µA. |
| BP | Reference Bypass | Accepts 0.01µF ceramic capacitor to reduce reference noise - essential for achieving 32µVRMS output noise specification. |
| GND | Analog/Digital Ground | Common return path; must be connected directly to EP pad and low-impedance ground plane to minimize noise coupling and thermal resistance. |
| EP | Exposed Thermal Pad | Internally connected to GND; soldering to PCB ground plane lowers θJA by >30°C/W and enables full 1.95W power dissipation capability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Enables simultaneous generation of two factory-set voltages (2.85V/1.80V for ETADK+T) without cross-regulation or shared feedback path. |
| P-channel MOSFET pass transistors | Delivers load-proportional dropout (60mV @ 100mA) and eliminates base-drive current loss - improves battery life vs. PNP-based regulators. |
| No mandatory bypass capacitor | Operates stably with only output capacitors (≥2.2µF ceramic), reducing bill-of-materials count and PCB area in size-sensitive designs. |
| Internal current limiting & thermal shutdown | 310mA min current limit per channel and +160°C thermal shutdown with 10°C hysteresis protect against short-circuit and overload conditions without external components. |
| Low-noise BP pin architecture | External 0.01µF capacitor on BP creates dedicated low-pass filter for reference, enabling 32µVRMS noise without increasing output capacitance or ESR. |
Applications
| Cellular Handsets | Digital Cameras |
|---|---|
Use Scenario: Powering baseband processor core (2.85V) and image sensor interface (1.80V) from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-rail LDO providing isolated, low-noise, independently controllable supplies to avoid noise coupling between digital processing and analog imaging blocks. Use Value: 32µVRMS noise prevents spurious patterns in raw image data; independent shutdown allows sensor power-down during preview mode while keeping processor active. | Use Scenario: Supplying CMOS image sensor (1.80V) and ISP (2.85V) in compact point-and-shoot camera with tight thermal constraints. IC Role / Device Role / Timing Role: Low-quiescent-current dual LDO delivering stable rails during burst capture and video recording, with thermal shutdown preventing overheating in sealed plastic housing. Use Value: 115µA per LDO minimizes standby drain; 1.95W TDFN-EP rating sustains 300mA loads without derating at ambient ≤60°C. |
| Notebook Subsystems | Wireless LAN Cards |
Use Scenario: Generating 2.85V for PCIe Gen1 SerDes and 1.80V for WLAN MAC in ultraportable notebook add-in module. IC Role / Device Role / Timing Role: Dual LDO with high PSRR (70dB @ 10kHz) rejecting noise from main CPU VRM and maintaining signal integrity on high-speed serial links. Use Value: 70dB PSRR suppresses 10kHz ripple from buck converter switching artifacts, preventing bit errors in 2.5Gbps PCIe lanes. | Use Scenario: Powering 802.11n RF transceiver (1.80V) and baseband SoC (2.85V) on mini-PCIe WLAN card with no heatsink. IC Role / Device Role / Timing Role: Compact dual LDO with exposed-pad TDFN package dissipating heat directly into PCB ground plane, eliminating need for thermal vias or copper pours. Use Value: 3mm × 3mm footprint fits within 12mm × 12mm mini-PCIe card area; EP pad connection achieves <40°C/W θJA, enabling full 300mA operation at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS70251PWP | Fixed 3.3V/2.5V outputs; higher 250µA IQ; requires 10µF output caps; no BP pin for noise reduction. | Not suitable for 2.85V/1.80V rail sets; higher noise (>60µVRMS); less efficient in battery-critical designs. | Select only if fixed 3.3V/2.5V outputs match system needs and board space allows larger capacitors. |
| Analog Devices ADP5310ACBZ-2-R7 | 2.8V/1.8V preset; 120µA IQ; 45µVRMS noise; requires 1µF ceramic caps; no independent shutdown. | Lower noise margin than MAX8559ETADK+T; single enable pin disables both LDOs - unsuitable for partial-power-down use cases. | Choose when independent shutdown is unnecessary and 45µVRMS noise suffices for target analog performance. |
Compared with TPS70251PWP and ADP5310ACBZ-2-R7, the MAX8559ETADK+T uniquely combines factory-matched 2.85V/1.80V outputs, 32µVRMS noise, independent shutdown, and 115µA IQ in a thermally robust TDFN-EP package - making it optimal for portable systems demanding precision dual-rail power with minimal solution size.
Availability
MAX8559ETADK+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 MAX8559ETADK+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) designs high-performance analog and mixed-signal ICs for power management, sensing, and communication applications in portable, industrial, and automotive markets.
The MAX8559 belongs to Maxim's ultra-low-noise LDO family targeting battery-powered portable electronics where dual-rail clean power, minimal quiescent current, and small footprint are critical design constraints.
FAQ
What output voltages does the MAX8559ETADK+T provide?
The MAX8559ETADK+T is factory-configured to deliver 2.85V on OUTA and 1.80V on OUTB. These values are fixed and non-adjustable; they correspond to the "DK" suffix in the part number per Maxim's Output Voltage Selector Guide. No external resistors or programming are required to set these voltages - they are trimmed during wafer test and guaranteed over temperature.
Does the MAX8559ETADK+T require an input bypass capacitor?
Yes, the MAX8559ETADK+T requires a minimum 2.2µF ceramic capacitor between INA/INB and GND for stability and line-transient response. For 300mA loads, Maxim recommends ≥4.7µF. The capacitor must be placed close to the pins with low-ESR ceramic dielectric (X5R or X7R); Z5U/Y5V types may require larger values below −10°C to maintain stability.
How does the BP pin function in the MAX8559ETADK+T?
The BP pin in the MAX8559ETADK+T connects to an internal resistor forming a low-pass filter with an external 0.01µF ceramic capacitor. This filter reduces reference voltage noise, enabling the specified 32µVRMS output noise. Omitting the BP capacitor increases output noise to 254µVRMS - acceptable only in non-noise-sensitive applications where board space or cost reduction is prioritized.
Can the MAX8559ETADK+T operate without an output capacitor?
No, the MAX8559ETADK+T requires output capacitors for stability. For 150mA loads, a minimum 2.2µF ceramic capacitor per output is required; for 300mA loads, ≥4.7µF is mandatory. The device is optimized for ceramic capacitors - tantalum types are not recommended due to ESR and reliability concerns. Removing output capacitors causes oscillation and regulation failure.
What thermal considerations apply to the MAX8559ETADK+T in TDFN-EP package?
The MAX8559ETADK+T in TDFN-EP package delivers 1.95W power dissipation capability when the exposed paddle (EP) is soldered to a solid PCB ground plane. Without EP connection, thermal resistance rises sharply, limiting safe continuous current. Layout guidelines require short, wide traces to GND, 2oz copper, and thermal vias under the EP pad to maintain junction temperature ≤150°C at 70°C ambient with 300mA loads on both channels.
MAX8559ETADK+T 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):
- 3.15V, 2.8V
- 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)
MAX8559ETADK+T FAQ
1.How can I place an order for MAX8559ETADK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8559ETADK+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 MAX8559ETADK+T reliable?
The price and inventory of MAX8559ETADK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8559ETADK+T is usually 5 days.
3.What payment methods are accepted for MAX8559ETADK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8559ETADK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8559ETADK+T?
MAX8559ETADK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8559ETADK+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 MAX8559ETADK+T?
For technical support, including MAX8559ETADK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8559ETADK+T requirements.
6.How does Aetrix verify that MAX8559ETADK+T is sourced from the original manufacturer or authorized distributors?
All MAX8559ETADK+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 MAX8559ETADK+T meets industry standards.
7.What is the process for return or replacement of MAX8559ETADK+T?
All MAX8559ETADK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8559ETADK+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 MAX8559ETADK+T part is unused and in its original packaging.
Return procedure for MAX8559ETADK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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