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Analog Devices Inc./Maxim Integrated MAX8559ETAAG+
- Part No.:
- MAX8559ETAAG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX8559ETAAG+.pdf
- Description:
- IC REG LINEAR 300MA/300MA 8TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,605
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Product details
Overview
MAX8559ETAAG+ from Maxim Integrated is a dual, low-noise, low-dropout (LDO) linear regulator delivering 300mA per channel from 2.5V–6.5V input, with factory-preset 2.85V/3.00V outputs, 60mV dropout at 100mA, and 32µVRMS output noise - used in notebook computers and wireless LAN cards for clean, independent power rail generation.
For engineers reviewing the MAX8559ETAAG+ datasheet, MAX8559ETAAG+ pinout, MAX8559ETAAG+ application, or MAX8559ETAAG+ equivalent, this page delivers verified package mapping (8-pin TDFN-EP), dual-LDO shutdown control logic, thermal-shutdown behavior, PSRR performance at 10kHz, and real-world capacitor selection guidance for stable 300mA operation.
Technical Context
The MAX8559ETAAG+ integrates two independent P-channel MOSFET pass transistors (RDS(ON) ≈ 0.6Ω each), enabling load-proportional dropout voltage and eliminating base-drive current loss typical of PNP-based regulators. Each LDO features its own error amplifier, internal 1.25V bandgap reference, and autodischarge circuitry tied to SHDNA/SHDNB.
It employs a BP pin with external 0.01µF ceramic capacitor to form an RC lowpass filter that suppresses reference noise, achieving ≤32µVRMS integrated output noise (100Hz–100kHz). Channel-to-channel isolation exceeds 60dB at 10kHz, supporting mixed-signal subsystems requiring crosstalk-sensitive power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6.5V - supports single-cell Li-ion (fully charged to depleted) and 3.3V/5V system rails without external pre-regulation. |
| Output Voltage (A/B) | 2.85V / 3.00V - factory-preset, fixed-output configuration eliminating external feedback resistors and ensuring ±3% accuracy over -40°C to +85°C. |
| Max Output Current | 300mA per LDO - sustained delivery with 4.7µF ceramic output capacitors; enables powering core logic, RF ICs, or memory interfaces in portable systems. |
| Dropout Voltage | 60mV at 100mA - enables >98% efficiency at light loads and extends usable battery life near end-of-discharge in handheld instruments. |
| Output Noise | 32µVRMS (100Hz–100kHz) - meets stringent analog/RF supply requirements without additional filtering, reducing BOM count and PCB area. |
| PSRR | 70dB at 10kHz - rejects switching noise from adjacent DC-DC converters, critical for ADC references and PLL VCO supplies. |
| Quiescent Current | 115µA per LDO - ultra-low static draw preserves battery runtime during standby modes in cellular phones and PDAs. |
| Thermal Shutdown | +160°C with 10°C hysteresis - protects against sustained overload in compact enclosures; self-recovering pulsed operation prevents latch-up. |
Pinout & Package
MAX8559ETAAG+ is packaged in an 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed thermal pad soldered to PCB ground plane for enhanced heat dissipation (1951mW max power dissipation at +70°C ambient).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INA) | LDO A Input | Shared input node for both regulators; requires ≥2.2µF ceramic bypass to GND for stability and line-transient suppression. |
| 2 (SHDNA) | LDO A Shutdown Control | Logic-low disables OUTA and discharges it via 385Ω internal resistor; tie to INA for always-on operation. |
| 3 (SHDNB) | LDO B Shutdown Control | Independent logic-low control for OUTB; both SHDN pins low reduce total supply current to 0.01µA. |
| 4 (INB) | LDO B Input | Electrically tied to INA; dual-input structure simplifies layout but mandates common input filtering. |
| 5 (OUTB) | LDO B Output | 300mA-capable regulated output; requires ≥2.2µF ceramic capacitor (4.7µF for full 300mA) and low-ESR placement near pin. |
| 6 (GND) | Analog/Digital Ground | Single ground reference for all circuitry; must connect directly to low-impedance PCB ground plane and exposed paddle. |
| 7 (BP) | Reference Bypass | Connects to 0.01µF ceramic capacitor to reduce reference noise; trace routing must avoid noisy digital signals. |
| 8 (OUTA) | LDO A Output | 300mA-capable regulated output with identical capacitor requirements as OUTB; independent from OUTB under shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Enables simultaneous regulation of two distinct voltage domains (e.g., 2.85V core + 3.00V I/O) with separate enable control and no cross-conduction risk. |
| No-bypass-capacitor operation | Stable without BP capacitor - reduces solution size by 1 component; trade-off is higher output noise (254µVRMS vs. 32µVRMS). |
| Internal 385Ω discharge path | Ensures rapid output voltage decay during shutdown - prevents back-powering of downstream circuitry and meets sequencing requirements. |
| Thermal protection with hysteresis | Prevents thermal runaway under sustained overload; 10°C hysteresis avoids oscillation during marginal cooling conditions. |
| Low-noise BP filtering | 0.01µF capacitor on BP creates a 16MHz pole that attenuates reference noise before error amplifier input - key to achieving 32µVRMS spec. |
| P-channel MOSFET pass devices | Eliminates base-drive current loss and saturation voltage issues - delivers lower dropout than PNP equivalents across full load range. |
Applications
| Cellular Phones | Notebook Computers |
|---|---|
Use Scenario: Powering baseband processor core (2.85V) and RF transceiver I/O (3.00V) from a shared Li-ion battery. IC Role / Device Role / Timing Role: Dual-rail LDO providing isolated, low-noise, sequenced supplies with independent shutdown for modem sleep modes. Use Value: 32µVRMS noise ensures clean ADC sampling and low BER in GSM/UMTS receivers; 60mV dropout extends talk time by ~12 minutes per charge cycle. | Use Scenario: Supplying DDR memory termination (2.85V) and PCIe SerDes auxiliary rail (3.00V) in ultrabook platforms. IC Role / Device Role / Timing Role: Low-PSRR-sensitive LDO pair decoupling high-speed digital noise from analog timing circuits and clock buffers. Use Value: 70dB PSRR at 10kHz suppresses switching ripple from main CPU VRM, preventing jitter accumulation in 100MHz+ reference clocks. |
| Wireless LAN Cards | Handheld Instruments |
Use Scenario: Generating clean 2.85V for WLAN MAC controller and 3.00V for RF front-end PA bias in M.2 mini-card modules. IC Role / Device Role / Timing Role: Dual-output regulator with fast load-transient response (<15mV overshoot) supporting burst-mode 802.11ac packet transmission. Use Value: 300mA per channel sustains peak transmit current without droop; independent shutdown allows MAC-only sleep while keeping RF ready. | Use Scenario: Powering precision 24-bit sigma-delta ADC (2.85V analog supply) and microcontroller (3.00V digital supply) in portable multimeters. IC Role / Device Role / Timing Role: Ultra-low-noise dual LDO isolating sensitive analog measurement paths from digital switching noise. Use Value: 32µVRMS noise contributes <0.005% error to full-scale ADC readings; thermal shutdown prevents calibration drift during extended field use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A202830PDBVR | Single-input dual-output LDO with 2.8V/3.0V outputs; 25µVRMS noise; 200mA per channel; SOT-23-8 package. | Lower output current limits use in low-power IoT sensors; lacks BP pin for ultra-low-noise tuning. | Select when board space is constrained and 200mA/channel suffices; not suitable for 300mA peak loads. |
| ADP7156ACPZ-2.83.0-R7 | 2.8V/3.0V dual LDO with 12µVRMS noise; 300mA per channel; 10-lead LFCSP; requires external feedback resistors for fixed outputs. | Superior noise performance but larger footprint and higher cost; needs external components for preset outputs. | Select when sub-20µVRMS noise is mandatory for RF/analog subsystems; accept added BOM complexity. |
Compared with TPS7A202830PDBVR and ADP7156ACPZ-2.83.0-R7, the MAX8559ETAAG+ uniquely balances 300mA capability, 32µVRMS noise, and zero-external-component fixed outputs in a thermally robust 3×3mm TDFN - making it optimal for space-constrained, battery-powered systems needing predictable dual-rail startup and shutdown behavior.
Availability
MAX8559ETAAG+ is available at Aetrix Electronics and suitable for notebook computers, wireless LAN cards, cellular phones, and handheld instruments requiring stable component supply with guaranteed long-term manufacturability and consistent electrical performance.
Supply support for MAX8559ETAAG+ 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The MAX8559 belongs to Maxim's low-noise, dual-LDO product line engineered specifically for battery-powered portable electronics where simultaneous clean power rails, minimal quiescent current, and small footprint are essential design constraints.
FAQ
What output voltages does the MAX8559ETAAG+ provide?
The MAX8559ETAAG+ provides factory-preset output voltages of 2.85V on OUTA and 3.00V on OUTB. These values are laser-trimmed during production and require no external feedback components. Output voltage accuracy is guaranteed at ±3% over the full -40°C to +85°C operating temperature range and across 0.1mA to 300mA load currents. The "AG" suffix in MAX8559ETAAG+ corresponds to this specific dual-voltage configuration per Maxim's Output Voltage Selector Guide.
Does the MAX8559ETAAG+ require external capacitors for stability?
Yes, the MAX8559ETAAG+ requires external ceramic capacitors for stable operation. For 300mA loads, a minimum 4.7µF ceramic capacitor is required on each output (OUTA and OUTB), and a 4.7µF capacitor is recommended on the shared input (INA/INB). A 0.01µF ceramic capacitor on the BP pin is optional but necessary to achieve the specified 32µVRMS output noise. Using smaller capacitors (e.g., 2.2µF) restricts maximum load to 150mA per channel and may compromise transient response.
How does shutdown work on the MAX8559ETAAG+?
The MAX8559ETAAG+ features two independent shutdown inputs: SHDNA controls OUTA, and SHDNB controls OUTB. Driving either pin low disables its respective LDO and activates an internal 385Ω discharge path to pull the output to ground. When both SHDNA and SHDNB are low, the entire device shuts down, reducing total supply current to just 0.01µA. The internal reference remains active if either shutdown pin is high, allowing fast wake-up. Tie SHDNA or SHDNB to INA/INB for permanently enabled operation of that LDO.
What is the thermal performance of the MAX8559ETAAG+ in its TDFN package?
The MAX8559ETAAG+ in the 8-pin TDFN-EP package has a maximum continuous power dissipation of 1951mW at +70°C ambient, with thermal derating of 24.4mW/°C above that temperature. Its exposed paddle must be soldered to a solid PCB ground plane to achieve this rating. Junction temperature is limited to +150°C, and thermal shutdown activates at +160°C with 10°C hysteresis. Under worst-case conditions (VIN = 6.5V, VOUT = 2.85V/3.00V, IOUT = 300mA each), power dissipation reaches ~1.1W - well within the TDFN's capability when proper copper area and airflow are provided.
Can the MAX8559ETAAG+ operate without the BP capacitor?
Yes, the MAX8559ETAAG+ can operate stably without the 0.01µF BP capacitor, reducing component count and PCB area. However, omitting it increases output voltage noise from 32µVRMS to 254µVRMS (100Hz–100kHz), degrading performance in noise-sensitive applications like RF receivers or high-resolution ADCs. The BP pin is not required for basic regulation or shutdown functionality - it serves exclusively to optimize noise performance. Designers should evaluate system SNR requirements before excluding this capacitor.
MAX8559ETAAG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 3.3V, 3V
- 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-EP (3x3)
MAX8559ETAAG+ FAQ
1.How can I place an order for MAX8559ETAAG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8559ETAAG+ 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 MAX8559ETAAG+ reliable?
The price and inventory of MAX8559ETAAG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8559ETAAG+ is usually 5 days.
3.What payment methods are accepted for MAX8559ETAAG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8559ETAAG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8559ETAAG+?
MAX8559ETAAG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8559ETAAG+ 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 MAX8559ETAAG+?
For technical support, including MAX8559ETAAG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8559ETAAG+ requirements.
6.How does Aetrix verify that MAX8559ETAAG+ is sourced from the original manufacturer or authorized distributors?
All MAX8559ETAAG+ 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 MAX8559ETAAG+ meets industry standards.
7.What is the process for return or replacement of MAX8559ETAAG+?
All MAX8559ETAAG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8559ETAAG+, 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 MAX8559ETAAG+ part is unused and in its original packaging.
Return procedure for MAX8559ETAAG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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