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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:3,846
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Product details
Overview
The MAX8561ETA+ from Maxim Integrated is a 4MHz, 500mA synchronous step-down DC-DC converter in an 8-pin 3mm × 3mm Thin DFN package, featuring logic-controlled output voltage, internal synchronous rectification, and 40µA typical quiescent current. It delivers regulated output from 0.6V to 2.5V across 2.7V–5.5V input, optimized for space-constrained portable power rails including microprocessor core supplies and CDMA RF power amplifier biasing.
For engineers reviewing the MAX8561ETA+ datasheet, MAX8561ETA+ pinout, MAX8561ETA+ application, or MAX8561ETA+ equivalent, key selection criteria include guaranteed 500mA output current, ±1.5% initial VFB accuracy, 0.1µA shutdown current, voltage-positioning transient response, and compatibility with 1µH–4.7µH inductors and 2.2µF ceramic capacitors.
Technical Context
The MAX8561ETA+ employs 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-sampling from the LX node via R1-eliminates phase lag from COUT, enabling stable loop response with minimal ceramic capacitance.
It integrates a P-channel high-side switch (RONP = 0.8–1.5Ω) and N-channel synchronous rectifier (RONN = 0.4–0.82Ω), eliminating external Schottky diodes. Logic-controlled output voltage is implemented via ODI/ODO pins, allowing dynamic switching between two regulated outputs without external FETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 500mA continuous - supports demanding portable SoC core rails. |
| Switching Frequency | Up to 4MHz adjustable - enables use of sub-2.2µH inductors and compact 2.2µF ceramic output capacitors. |
| Quiescent Current | 40µA typical - extends battery life in always-on low-power states. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ and dual-cell alkaline inputs. |
| Output Voltage Range | 0.6V to 2.5V - programmable via resistive divider on FB pin for precise core voltage scaling. |
| VFB Accuracy | ±1.5% at +25°C - ensures tight regulation tolerance for sensitive digital loads. |
| Shutdown Current | 0.1µA - reduces system standby power to negligible levels. |
Pinout & Package
The MAX8561ETA+ is housed in an 8-pin, 3mm × 3mm × 0.8mm Thin DFN package with exposed thermal pad (EP) connected to GND. This thermally enhanced lead-free package supports high power density in ultra-compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Voltage Feedback Input | Regulates output by comparing divider voltage to 0.6V reference; enables voltage-positioning topology. |
| 2 (ODI) | Digital Control Input | Logic-selects ODO state: high forces ODO low (MAX8561); low places ODO in high-Z (MAX8561) or enables 10kΩ pullup to IN (MAX8562). |
| 3 (SHDN) | Active-Low Shutdown | Pulls low to enter 0.1µA shutdown; high or tied to IN enables normal operation. |
| 4 (PGND) | Power Ground | Separate low-impedance return path for LX switching current; must be connected directly to GND plane. |
| 5 (LX) | Switch Node | Connects to inductor; carries high di/dt switching current; requires short, wide trace routing. |
| 6 (IN) | Input Supply | 2.7V–5.5V input; bypassed with 2.2µF ceramic capacitor placed adjacent to IN and PGND. |
| 7 (GND) | Analog Ground | Reference for FB, SHDN, ODI; kept separate from PGND until joined at single point near EP. |
| 8 (ODO) | Open-Drain Output | Configurable auxiliary output: toggles second regulated rail (MAX8561) or drives external PFET gate (MAX8562). |
| EP | Exposed Thermal Pad | Must be soldered to solid GND copper area for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Controlled Output Voltage | ODI/ODO interface enables real-time switching between two pre-set output voltages without external circuitry. |
| 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 | Integrated P/N-FET pair eliminates Schottky diode loss, improving light-load efficiency and reducing BOM count. |
| Soft-Start Circuitry | Eliminates inrush current during startup, reducing stress on input source and minimizing required input capacitance. |
| Hysteretic-PWM Hybrid Control | Combines fixed-frequency PWM stability with hysteretic responsiveness for fast transient recovery and low output ripple. |
Applications
| Microprocessor Core Supply | CDMA RF Power Amplifier Bias |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores in smartphones requiring dynamically scaled 0.8V–1.3V rails with rapid load transients. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise core voltage with voltage-positioning for overshoot suppression. Use Value: Enables 500mA peak current delivery with <50mV transient deviation under 0–500mA step loads, extending battery runtime via 40µA quiescent current. | Use Scenario: Supplies bias voltage to CDMA PA modules needing dual-mode operation: low-power 1.2V mode and high-power VBATT-bypass mode. IC Role / Device Role / Timing Role: Configurable buck controller using ODI/ODO to toggle between regulated output and 100% duty-cycle bypass path. Use Value: Eliminates need for discrete PFET and gate driver; achieves seamless transition between modes with <20µs settling time per MAX8562 toc17. |
| PDA/DSC System Rail | Smartphone Application Processor PMIC Sub-Block |
Use Scenario: Generates 1.8V I/O or 2.5V analog subsystem rail in handheld devices with strict board area constraints. IC Role / Device Role / Timing Role: Compact, high-frequency DC-DC converter supporting 1µH inductors and 2.2µF X5R/X7R ceramics for minimal footprint. Use Value: Reduces total solution size by >40% vs. 2.25MHz alternatives; maintains >85% efficiency at 100mA load with 3.6V input. | Use Scenario: Provides dedicated core voltage for application processor subsystems where independent regulation and fast transient response are critical. IC Role / Device Role / Timing Role: Standalone synchronous buck IC integrated into multi-rail PMIC architecture, controlled via baseband processor GPIOs. Use Value: Delivers ±1.5% output accuracy and <100ns minimum on/off times for stable operation under burst-mode processor loads. |
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 |
|---|---|---|---|
| TPS62231DRYT | 3MHz max frequency, 300mA rated output, 2.5V–6.5V input range, no ODI/ODO logic control | Lacks dual-voltage switching capability; suited for fixed-output, lower-current rails | Select when only basic 300mA regulation is needed and board space allows larger inductor. |
| RT8059NGSP | 2.5MHz max frequency, 600mA output, 2.5V–5.5V input, no voltage-positioning feedback | Higher current but slower transient response; requires larger output capacitor for same ripple performance | Choose for higher output current where 4MHz switching and ultra-low IQ are not mandatory. |
Compared with the MAX8561ETA+, the TPS62231DRYT offers lower cost and simpler layout but sacrifices 500mA drive capability and logic-controlled voltage flexibility; the RT8059NGSP provides greater current headroom yet lacks the voltage-positioning architecture critical for minimizing transient overshoot in core supplies.
Availability
The MAX8561ETA+ is available at Aetrix Electronics and suitable for microprocessor core supplies, CDMA RF power amplifier biasing, and portable consumer electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and portable applications.
The MAX8560/MAX8561/MAX8562 product line was engineered specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered handheld devices where board area, thermal performance, and light-load efficiency are critical.
FAQ
What is the maximum switching frequency supported by the MAX8561ETA+?
The MAX8561ETA+ supports a maximum switching frequency of 4MHz. This high-frequency capability allows designers to use smaller inductors (down to 1µH) and ceramic output capacitors (as low as 2.2µF), significantly reducing solution footprint. The frequency is adjustable via external components and remains stable across load and input voltage variations, as confirmed in the Typical Operating Characteristics section (Figure MAX8560 toc08).
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 stated in the General Description and Detailed Description sections. This eliminates conduction losses associated with external diodes and improves efficiency-especially at light loads-while reducing bill-of-materials count and PCB area.
How is output voltage programmed on the MAX8561ETA+?
The output voltage of the MAX8561ETA+ is programmed using a resistive divider between LX and GND, with the center tap connected to the FB pin. The device regulates FB to 0.6V nominal, so VOUT = 0.6V × (1 + R1/R2). For example, selecting R2 = 100kΩ and R1 = 100kΩ yields 1.2V output. This configuration implements voltage-positioning load regulation, as detailed in the Applications Information section.
What is the purpose of the ODI and ODO pins on the MAX8561ETA+?
The ODI (digital input) and ODO (open-drain output) pins on the MAX8561ETA+ enable logic-controlled dual-output functionality. When ODI is driven high, ODO is pulled low, allowing the MAX8561 to toggle between two regulated output voltages (e.g., 1.0V and 1.5V per Figure 2). This eliminates the need for external switches or additional regulators in applications requiring dynamic voltage scaling, such as mobile processor subsystems.
What thermal considerations apply to the MAX8561ETA+ package?
The MAX8561ETA+ uses an 8-pin 3mm × 3mm Thin DFN package with an exposed thermal pad (EP) that must be soldered to a solid GND copper area for effective heat dissipation. The package has a thermal resistance θJA of ~51.4°C/W (calculated from 1951mW max power dissipation at TA = +70°C), and thermal shutdown activates at +160°C with 20°C hysteresis. Proper PCB layout-including direct EP-to-GND connection and adequate copper pour-is essential to maintain junction temperature below +150°C under full 500mA load.
MAX8561ETA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (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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