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Analog Devices Inc./Maxim Integrated MAX8561ETA+T
- Part No.:
- MAX8561ETA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX8561ETA+T.pdf
- Description:
- IC REG BUCK ADJ 500MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
MAX8561ETA+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained, high-efficiency applications. It delivers guaranteed 500mA output current with 40µA typical quiescent current, operates from 2.7V to 5.5V input, and supports adjustable output voltage from 0.6V to 2.5V using an external resistor divider. Its logic-controlled output voltage feature enables dynamic voltage scaling in microprocessor core supplies.
For engineers reviewing the MAX8561ETA+T datasheet, MAX8561ETA+T pinout, MAX8561ETA+T application, or MAX8561ETA+T equivalent, key selection criteria include its 4MHz PWM switching frequency, ±1.5% initial output voltage accuracy, internal synchronous rectification eliminating external Schottky diodes, thermal shutdown protection, and compatibility with ultra-small 1µH inductors and 2.2µF ceramic capacitors.
Technical Context
The MAX8561ETA+T 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-eliminates phase lag from the output capacitor, enabling stable loop response with minimal ceramic capacitance.
This device integrates a P-channel high-side switch and N-channel synchronous rectifier with on-resistances of 0.8Ω (typ) and 0.4Ω (typ), respectively, and features logic-controlled output voltage via the ODI/ODO pins. Shutdown current is 0.1µA (typ), and soft-start eliminates inrush current without requiring external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li+ and dual-cell alkaline inputs without external regulation. |
| Output Current | 500mA guaranteed - sufficient for DSP/microprocessor core rails and RF power amplifier biasing. |
| Switching Frequency | Up to 4MHz - enables use of sub-2.2µH inductors and <3.3mm² total solution footprint. |
| Quiescent Current | 40µA (typ) - extends battery life in always-on portable devices during light-load operation. |
| Output Voltage Accuracy | ±1.5% (initial, TA = +25°C) - ensures tight regulation for low-voltage digital cores (e.g., 1.2V ±18mV). |
| FB Threshold Voltage | 0.6V (nominal) - sets minimum output voltage and defines resistive divider ratio for precise VOUT programming. |
| Shutdown Current | 0.1µA (typ) - reduces system standby power to negligible levels in sleep modes. |
Pinout & Package
MAX8561ETA+T is housed in an 8-pin 3mm × 3mm × 0.8mm Thin DFN package with exposed paddle (EP), rated for -40°C to +85°C operation. The package provides low thermal resistance and requires soldering the EP to GND for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Power Input | 2.7V–5.5V supply input; must be bypassed with 2.2µF ceramic capacitor placed adjacent to IN and GND pins. |
| 2 (GND) | Analog Ground | Reference ground for control circuitry; separate from PGND to minimize noise coupling into feedback path. |
| 3 (SHDN) | Active-Low Enable | Pull low to enter 0.1µA shutdown mode; pull high or connect to IN for normal operation. |
| 4 (FB) | Voltage Feedback Input | Senses 0.6V reference at divider midpoint; connects to LX–GND resistor network for voltage positioning. |
| 5 (PGND) | Power Ground | High-current return path for LX switch and synchronous rectifier; must be connected directly to PCB ground plane. |
| 6 (LX) | Switch Node | Connection to internal PFET/NFET drains; routes high di/dt switching current and requires short, wide trace routing. |
| 7 (ODI) | Digital Control Input | Logic input controlling ODO state: high forces ODO low (MAX8561); low places ODO in high-Z (MAX8561) or enables 10kΩ pullup to IN (MAX8562). |
| 8 (ODO) | Open-Drain Output | Internal NMOS output used for dual-voltage selection (MAX8561) or external PFET gate drive (MAX8562); not present in MAX8560. |
| EP | Exposed Thermal Pad | Must be soldered to GND plane for thermal dissipation and EMI reduction; contributes to 24.4mW/°C derating above +70°C. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning load regulation | Uses LX-sampled feedback to shift output voltage by ILOAD × RDS(ON) of inductor, halving peak-to-peak transient excursions vs. conventional buck converters. |
| Logic-controlled output voltage | ODI/ODO pins enable real-time switching between two regulated output voltages (e.g., 1.0V/1.5V) without external MOSFETs or controllers. |
| Internal synchronous rectification | Eliminates need for external Schottky diode, improving full-load efficiency by ~8–12% and reducing BOM count and board area. |
| Programmable 4MHz switching | Fixed-frequency PWM allows predictable EMI filtering and supports inductor values as low as 1µH for ultra-compact designs. |
| Integrated soft-start | Prevents input inrush current during startup, reducing required input capacitance and avoiding brownout in high-impedance sources (e.g., coin cells). |
Applications
| Microprocessor Core Supply | CDMA RF Power Amplifier Bias |
|---|---|
Use Scenario: Providing dynamically scaled core voltage (e.g., 1.0V/1.2V) to ARM-based application processors in smartphones. IC Role / Device Role / Timing Role: Primary step-down regulator delivering tightly regulated, low-noise DC power to CPU/DSP cores with fast transient response. Use Value: Logic-controlled ODI/ODO enables seamless voltage transitions during DVFS, minimizing timing violations and reducing system-level power by >15%. |
Use Scenario: Generating bias voltage for CDMA PA stages requiring high-efficiency, low-quiescent-current operation in standby and transmit modes. IC Role / Device Role / Timing Role: High-frequency buck converter supplying 2.5V/500mA to PA driver stage while maintaining <40µA quiescent draw during idle. Use Value: 4MHz switching allows use of 1µH inductors, shrinking total solution size to <12mm² and meeting stringent RF isolation requirements. |
| Smartphone Application Processor Rail | Portable Media Player DSP Supply |
Use Scenario: Powering multi-core application processors in LTE smartphones where board space and thermal density are critical constraints. IC Role / Device Role / Timing Role: Synchronous buck regulator delivering 1.2V @ 500mA with ±1.5% accuracy and <20µs load-step recovery time. Use Value: Voltage-positioning feedback reduces output capacitor requirement to 2.2µF X5R, cutting solution height to <1.0mm and eliminating bulk tantalum capacitors. |
Use Scenario: Supplying clean, efficient power to audio DSPs in MP3 players operating from single-cell Li+ batteries. IC Role / Device Role / Timing Role: Low-IQ DC-DC converter maintaining regulation across 3.0V–4.2V battery range while delivering 1.8V @ 300mA. Use Value: 40µA quiescent current extends playback time by >8 hours per charge cycle compared to legacy 200µA solutions. |
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 |
|---|---|---|---|
| TPS62231DRVR | 3MHz max switching frequency; 400mA output current; 22µA IQ; requires external compensation network. | Lacks logic-controlled output voltage and voltage-positioning feedback; less suitable for dual-voltage core rails. | Select when lower quiescent current and simpler compensation outweigh need for ODI/ODO control and transient performance. |
| RT8059NGSP | 2.5MHz max frequency; 600mA output; 35µA IQ; no integrated ODO/ODI functionality; uses standard FB topology. | Does not support LX-sampled feedback or programmable dual-output states; higher output ripple under transient loads. | Choose for cost-sensitive designs where dual-voltage control and ultra-fast transient response are not required. |
Compared with TPS62231DRVR and RT8059NGSP, the MAX8561ETA+T offers unique voltage-positioning load regulation and integrated logic-controlled output voltage-enabling smaller output capacitance, faster transient recovery, and dynamic voltage scaling without external switches-making it optimal for space-constrained, multi-rail portable systems.
Availability
MAX8561ETA+T is available at Aetrix Electronics and suitable for microprocessor core supplies, CDMA RF power-amplifier biasing, and portable media player DSP power rails requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX8561ETA+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX8560/MAX8561/MAX8562 series was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered portable electronics-emphasizing minimal external component count, sub-1mm profile, and dynamic voltage control capability.
FAQ
What is the maximum supported switching frequency for the MAX8561ETA+T?
The MAX8561ETA+T supports a maximum switching frequency of 4MHz. This high-frequency operation allows designers to use smaller inductors (down to 1µH) and ceramic output capacitors (as low as 2.2µF), significantly reducing solution footprint and height. Frequency remains stable across load and input voltage variations due to its proprietary hysteretic-PWM control architecture.
How does the voltage-positioning feedback in the MAX8561ETA+T improve transient response?
The MAX8561ETA+T implements voltage-positioning feedback by sampling from the LX node instead of the output, causing the regulated voltage to drop linearly with load current (VOUT = VREF – ILOAD × RDCR). This intentional droop reduces overshoot during load transients by half compared to conventional buck regulators, enabling stable operation with minimal output capacitance and faster recovery times.
Can the MAX8561ETA+T be used to generate two different output voltages?
Yes, the MAX8561ETA+T supports dual-output voltage generation using its ODI and ODO pins. By toggling the logic state of ODI, the internal open-drain output ODO can be switched between high-impedance and pulled low, altering the feedback network to select between two preset output voltages (e.g., 1.0V and 1.5V), as shown in Figure 2 of the datasheet.
What is the purpose of the exposed thermal pad (EP) on the MAX8561ETA+T package?
The exposed thermal pad (EP) on the MAX8561ETA+T must be soldered to a GND plane to provide effective thermal dissipation and reduce junction temperature rise. It contributes to the device's 24.4mW/°C derating factor above +70°C and improves EMI performance by lowering high-frequency impedance paths. Failure to connect EP may result in thermal shutdown or reduced reliability.
Does the MAX8561ETA+T require an external Schottky diode?
No, the MAX8561ETA+T does not require an external Schottky diode. It integrates both a P-channel high-side switch and an N-channel synchronous rectifier, eliminating conduction losses associated with external diodes and improving full-load efficiency by approximately 8–12%. This integration also reduces bill-of-materials count and simplifies PCB layout.
MAX8561ETA+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
- 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+T FAQ
1.How can I place an order for MAX8561ETA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8561ETA+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 MAX8561ETA+T reliable?
The price and inventory of MAX8561ETA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8561ETA+T is usually 5 days.
3.What payment methods are accepted for MAX8561ETA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8561ETA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8561ETA+T?
MAX8561ETA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8561ETA+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 MAX8561ETA+T?
For technical support, including MAX8561ETA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8561ETA+T requirements.
6.How does Aetrix verify that MAX8561ETA+T is sourced from the original manufacturer or authorized distributors?
All MAX8561ETA+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 MAX8561ETA+T meets industry standards.
7.What is the process for return or replacement of MAX8561ETA+T?
All MAX8561ETA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8561ETA+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 MAX8561ETA+T part is unused and in its original packaging.
Return procedure for MAX8561ETA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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