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Analog Devices Inc./Maxim Integrated MAX8561ETA
- Part No.:
- MAX8561ETA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX8561ETA.pdf
- Description:
- IC REG BUCK ADJ 500MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,232
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Product details
Overview
MAX8561ETA from Maxim Integrated is a 4MHz, 500mA synchronous step-down DC-DC converter in an 8-pin 3mm × 3mm × 0.8mm Thin DFN package, featuring logic-controlled output voltage, 0.6V to 2.5V adjustable VOUT, ±1.5% initial FB accuracy, and 40µA typical quiescent current. It delivers regulated core power for microprocessor/DSP applications with fast transient response and integrated synchronous rectification.
For engineers reviewing the MAX8561ETA datasheet, MAX8561ETA pinout, MAX8561ETA application, or MAX8561ETA equivalent, key selection criteria include its logic-selectable dual-output capability (via ODI/ODO), voltage-positioning load regulation, thermal shutdown at +160°C, and compatibility with ultra-small 1µH inductors and 2.2µF ceramic capacitors in space-constrained portable designs.
Technical Context
The MAX8561ETA implements a proprietary hysteretic-PWM control scheme that maintains fixed-frequency operation up to 4MHz while enabling trade-offs between efficiency and external component size. Its voltage-positioning feedback architecture samples the LX node through R1, eliminating phase lag from COUT and enabling stable loop response with minimal ceramic capacitance.
It integrates complementary P-channel and N-channel MOSFETs (RONP = 0.8–1.5Ω, RONN = 0.4–0.82Ω) and features a dedicated logic-controlled open-drain output (ODO) with digital input (ODI) to toggle between two regulated voltages - a function confirmed exclusively for the MAX8561 variant per datasheet Figure 2 and Pin Description table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li+ and alkaline battery inputs without external regulators. |
| Output Current | Guaranteed 500mA - sufficient for DSP/microprocessor core rails in handheld devices. |
| Switching Frequency | Up to 4MHz - enables use of sub-2.2µH inductors and reduces footprint vs. 1–2MHz converters. |
| Quiescent Current | 40µA (typ) - extends battery life in standby mode for cellular and smart phone applications. |
| FB Threshold Voltage | 0.6V ±1.5% (initial) - sets precise output voltage via external resistor divider (e.g., 100kΩ R2). |
| Shutdown Current | 0.1µA - minimizes leakage during system sleep; activated by logic-low SHDN pin. |
| Thermal Shutdown | +160°C with 20°C hysteresis - protects against sustained overload or poor PCB heat sinking. |
Pinout & Package
MAX8561ETA is housed in an 8-pin, 3mm × 3mm × 0.8mm Thin DFN package with exposed thermal pad (EP) connected to GND. The package supports high-power density layouts and requires soldering the EP to a thermal copper plane for optimal junction temperature management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Voltage Feedback Input | Regulates output to 0.6V reference; connects to center of resistive divider between LX and GND for voltage-positioning behavior. |
| 2 ODO | Open-Drain Output | Logic-controlled auxiliary output; sinks current when ODI = high (MAX8561), used to toggle second regulated rail (e.g., 1.0V/1.5V). |
| 3 SHDN | Active-Low Shutdown | Pulls low to reduce supply current to 0.1µA; must be tied to IN or logic high for normal operation. |
| 4 GND | Analog Ground | Reference for FB, SHDN, and ODI; separate from PGND to minimize noise coupling into feedback path. |
| 5 PGND | Power Ground | High-current return path for LX switch and synchronous rectifier; connects directly to EP and input/output capacitor grounds. |
| 6 LX | Switch Node | Connects to inductor; carries high di/dt switching current; requires short, wide trace routing to minimize EMI. |
| 7 IN | Input Supply | 2.7V–5.5V input; bypassed with 2.2µF ceramic capacitor placed adjacent to IN and PGND pins. |
| 8 ODI | Digital Input for ODO Control | Logic input controlling ODO state: high → ODO pulled low (enables second output); low → ODO high-impedance (default mode). |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Controlled Dual Output | ODI/ODO interface enables seamless switching between two regulated output voltages (e.g., 1.0V and 1.5V) without external controllers or sequencing ICs. |
| Voltage-Positioning Load Regulation | Output drops linearly with load current (ΔV = ILOAD × RDCR), halving peak-to-peak transient excursions vs. conventional buck converters. |
| Internal Synchronous Rectification | Eliminates need for external Schottky diode; improves full-load efficiency by ~8–12% and reduces thermal stress on PCB. |
| Programmable 4MHz Switching | Allows selection of smaller magnetics (e.g., 1µH) and lower-profile capacitors while maintaining >85% efficiency at 200mA load. |
| Soft-Start Circuitry | Prevents inrush current at startup, reducing required input capacitance and avoiding brownout on high-impedance sources like coin cells. |
Applications
| Microprocessor Core Supply | CDMA RF Power Amplifier Bias |
|---|---|
|
Use Scenario: Providing dynamically scalable core voltage to ARM9 or DSP processors in smartphones during active and idle states. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated 1.0V–1.5V at up to 500mA with logic-triggered voltage transitions. Use Value: Enables rapid ODI-driven voltage scaling to match processing load, reducing dynamic power consumption by up to 35% versus fixed-output solutions. |
Use Scenario: Generating bias voltage for CDMA PA stages requiring fast-switching between low-power (LP) and high-power (HP) modes. IC Role / Device Role / Timing Role: Dual-rail controller using ODI/ODO to select between 1.2V (LP) and VBATT (HP) outputs in under 40µs (per toc16). Use Value: Eliminates need for discrete FET + driver in PA bias path, saving 22mm² board area and simplifying layout in antenna module zones. |
| Smartphone Application Processor Rail | PDA/MP3 Player DSP Core |
|
Use Scenario: Powering application processor cores (e.g., Qualcomm Snapdragon) with tight transient response requirements during burst-mode video decode. IC Role / Device Role / Timing Role: High-bandwidth synchronous buck converter with voltage-positioning feedback ensuring <50mV output deviation during 0→500mA load steps. Use Value: Maintains processor stability during real-time multimedia workloads without requiring oversized 10µF+ output capacitors. |
Use Scenario: Supplying clean, low-noise 1.2V to audio DSPs in portable media players during playback and recording. IC Role / Device Role / Timing Role: Low-quiescent-current (40µA typ) step-down regulator supporting extended battery life and soft-start to prevent pop/click artifacts. Use Value: Delivers >12-hour playback on single Li+ cell while meeting <10mVpp ripple spec across 20Hz–20kHz audio band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.8V output; no logic-controlled voltage selection; 3MHz max frequency; 35µA IQ. | Lacks ODI/ODO dual-rail capability; suitable only for static-voltage applications. | Select when output voltage is fixed and board space is more constrained than feature flexibility. |
| RT8059GJ6 | Adjustable 0.6–5.5V output; 3MHz switching; 25µA IQ; no integrated ODO/ODI logic interface. | Requires external GPIO and level-shifter to emulate dual-rail behavior; adds BOM cost and layout complexity. | Choose if higher input voltage range (up to 5.5V) and lower IQ are prioritized over integrated logic control. |
Compared with TPS62231DRYR and RT8059GJ6, the MAX8561ETA uniquely integrates dual-output logic control in a 3mm × 3mm footprint, enabling voltage scaling without external components - a critical advantage for CDMA PA bias and multi-core processor supplies where timing-critical rail transitions are required.
Availability
MAX8561ETA is available at Aetrix Electronics and suitable for microprocessor core supplies, CDMA RF power amplifier biasing, and portable media player DSP power delivery requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for MAX8561ETA 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 portable, industrial, and communications systems.
The MAX856x series was designed specifically for space-constrained, battery-powered applications demanding high efficiency at light loads and fast transient response - targeting cellular handsets, PDAs, and portable audio devices.
FAQ
What is the maximum supported switching frequency of the MAX8561ETA?
The MAX8561ETA supports a programmable switching frequency up to 4MHz. This high-frequency capability allows designers to use smaller inductors (e.g., 1µH) and ceramic capacitors, significantly reducing solution footprint. Frequency remains stable across load and input voltage variations, as confirmed in the Typical Operating Characteristics graph "SWITCHING FREQUENCY vs. LOAD CURRENT" (toc08) and Electrical Characteristics table.
How does the MAX8561ETA achieve dual-output voltage selection?
The MAX8561ETA achieves dual-output voltage selection via its dedicated ODI (digital input) and ODO (open-drain output) pins. When ODI is driven high, ODO is pulled low, enabling a second regulated output (e.g., 1.0V) using an external resistor network - as shown in Figure 2 of the datasheet. This logic-controlled function is exclusive to the MAX8561 variant and is not present in MAX8560 or MAX8562.
What is the purpose of voltage-positioning load regulation in the MAX8561ETA?
Voltage-positioning load regulation in the MAX8561ETA intentionally introduces a controlled output voltage droop proportional to load current (ΔV = ILOAD × RDCR). This design eliminates overshoot during load transients, halving peak-to-peak output excursions compared to standard buck converters - a benefit validated in the "OUTPUT VOLTAGE vs. LOAD CURRENT (VOLTAGE POSITIONING)" graph (toc09) and Detailed Description section.
Does the MAX8561ETA require an external Schottky diode?
No, the MAX8561ETA does not require an external Schottky diode. It integrates internal synchronous rectification using complementary P-channel and N-channel MOSFETs, as explicitly stated in the General Description and Pin Description sections. This eliminates conduction losses associated with external diodes and improves full-load efficiency by approximately 8–12%.
What is the recommended input and output capacitor configuration for the MAX8561ETA?
The MAX8561ETA is optimized for 2.2µF X5R/X7R ceramic capacitors at both input (CIN) and output (COUT), as specified in the Typical Operating Circuit and Applications Information sections. The unique voltage-positioning feedback allows stable operation with this small value, though COUT ≥ L (in µH) is recommended for best transient performance - e.g., 2.2µF for a 2.2µH inductor.
MAX8561ETA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 2.5V
- Current - Output:
- 500mA
- Frequency - Switching:
- Up ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN-EP (3x3)
MAX8561ETA FAQ
1.How can I place an order for MAX8561ETA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8561ETA 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 MAX8561ETA reliable?
The price and inventory of MAX8561ETA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8561ETA is usually 5 days.
3.What payment methods are accepted for MAX8561ETA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8561ETA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8561ETA?
MAX8561ETA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8561ETA 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 MAX8561ETA?
For technical support, including MAX8561ETA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8561ETA requirements.
6.How does Aetrix verify that MAX8561ETA is sourced from the original manufacturer or authorized distributors?
All MAX8561ETA 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 MAX8561ETA meets industry standards.
7.What is the process for return or replacement of MAX8561ETA?
All MAX8561ETA units undergo pre-shipment inspection (PSI). If there is an issue with MAX8561ETA, 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 MAX8561ETA part is unused and in its original packaging.
Return procedure for MAX8561ETA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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