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Analog Devices Inc./Maxim Integrated MAX8640ZELT15+T
- Part No.:
- MAX8640ZELT15+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8640ZELT15+T.pdf
- Description:
- IC REG BUCK 1.5V 500MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:40,000
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Product details
Overview
MAX8640ZELT15+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications. It delivers up to 500mA at a factory-preset 1.5V output, operates with a 4MHz switching frequency, uses only a 1µH inductor and 2.2µF output capacitor, and achieves 28µA quiescent current - enabling long battery life in handheld devices.
For engineers reviewing the MAX8640ZELT15+T datasheet, MAX8640ZELT15+T pinout, MAX8640ZELT15+T application, or MAX8640ZELT15+T equivalent, key selection criteria include its µDFN (1.5mm × 1.0mm) package size, ultrasonic pulse-skipping mode down to 1mA loads, ±1% initial output voltage accuracy, voltage-positioning load regulation, and compatibility with low-ESR ceramic capacitors without external feedback components.
Technical Context
The MAX8640ZELT15+T implements a proprietary hysteretic PWM control scheme that enables fixed-frequency operation up to 4MHz while maintaining fast line/load transient response and low output ripple across all load conditions. Its internal synchronous rectification replaces the external Schottky diode, eliminating conduction losses and improving efficiency at light-to-moderate loads.
Voltage-positioning load regulation is achieved by sensing feedback directly from the LX node, removing phase lag from the output capacitor and yielding load regulation equal to the inductor's DC resistance multiplied by load current. This architecture reduces peak-to-peak output-voltage excursions during transients by approximately 50% compared to conventional buck converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.5V (±1% initial accuracy); eliminates need for external resistor divider |
| Switching Frequency | Up to 3.9MHz (typical at 1.5V output); enables use of 1µH inductor and compact 2.2µF ceramic output capacitor |
| Max Output Current | 500mA guaranteed; supports core/I/O power for microprocessors, DSPs, and baseband ICs |
| Quiescent Current | 28µA typical at no load; extends battery runtime in always-on or low-duty-cycle systems |
| Input Voltage Range | 2.7V to 5.5V; compatible with single-cell Li+ (3.0–4.2V), alkaline (3.0–4.5V), and regulated 3.3V/5V rails |
| Shutdown Current | 0.01µA typical; reduces system standby power to negligible levels |
| Package | 6-pin µDFN (1.5mm × 1.0mm, 0.5mm height); ultra-small footprint for high-density PCB layouts |
Pinout & Package
MAX8640ZELT15+T is housed in a lead-free, RoHS-compliant 6-pin µDFN package measuring 1.5mm × 1.0mm with an exposed thermal pad. The package supports high thermal performance in minimal board area and is compatible with standard reflow soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LX | Switch node connecting internal p-channel and n-channel MOSFET drains; requires short, low-inductance trace to inductor |
| 2, 5 | GND | Dual ground terminals; must be connected together directly under IC and tied to input/output capacitor grounds |
| 3 | OUT | Output voltage sense input; internally connected to feedback network; bypass with ceramic capacitor near pin |
| 4 | SHDN | Active-low shutdown control; logic-high enables regulator; ≥10µs low pulse required after VIN exceeds UVLO to reset logic |
| 6 | IN | Main power input (2.7V–5.5V); bypass with ceramic capacitor adjacent to pin and GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic pulse-skipping mode | Maintains switching above 20kHz down to 1mA load, eliminating audible noise in consumer audio devices |
| Voltage-positioning load regulation | Load regulation = IL × DCR(L), reducing transient overshoot by ~50% versus traditional buck topologies |
| Internal synchronous rectification | Replaces external Schottky diode; improves light-load efficiency and eliminates reverse-recovery losses |
| Integrated soft-start | Eliminates inrush current at startup, reducing stress on input source and allowing use with high-impedance batteries |
| Factory-preset output | 1.5V output set internally; removes external resistors, saves board space, and ensures ±1% accuracy over temperature |
Applications
| Microprocessor Core Power | I/O Power Supply |
|---|---|
|
Use Scenario: Powering ARM Cortex-M4/M7 or RISC-V MCU cores requiring stable 1.5V at ≤500mA in wearables and IoT edge nodes. IC Role / Device Role / Timing Role: Primary step-down regulator delivering tightly regulated core voltage with fast load-transient response to handle burst-mode CPU activity. Use Value: Voltage-positioning regulation minimizes VDD droop during 0→500mA transients, preventing timing violations and system resets. |
Use Scenario: Supplying 1.5V I/O banks for FPGAs, ADCs, or interface ICs (e.g., SPI, I²C peripherals) in compact sensor modules. IC Role / Device Role / Timing Role: Dedicated low-noise, low-ripple power rail decoupled from core supply to ensure signal integrity and timing margin. Use Value: 4MHz switching and internal synchronous rectification reduce output ripple to <10mVPP, meeting noise-sensitive analog interface requirements. |
| Cell Phone Baseband Power | Portable Medical Sensor Power |
|
Use Scenario: Providing 1.5V supply to LTE/Wi-Fi baseband processors in slim smartphones and feature phones where PCB area is constrained. IC Role / Device Role / Timing Role: High-frequency buck converter enabling smallest possible passive component footprint (1µH + 2.2µF). Use Value: µDFN package (1.5mm × 1.0mm) and 4MHz operation reduce total solution size by >40% vs. 2MHz alternatives. |
Use Scenario: Powering low-power ECG, pulse oximeter, or glucose monitor ASICs operating from coin-cell or small Li-ion batteries. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current (28µA) regulator sustaining weeks of standby time while supporting rapid wake-up bursts. Use Value: 0.01µA shutdown current and fast soft-start enable reliable cold-start from depleted batteries without input capacitor overstress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 2.25V–5.5V input; 1.5V fixed output; 3MHz switching; 400mA max output; 6-pin WSON (2mm × 2mm) | Larger package (2×2mm vs. 1.5×1.0mm); lower current rating limits use in higher-power baseband or multi-core MCUs | Select when needing TI's WEBENCH support or tighter production lot traceability; not drop-in due to larger footprint and different pinout |
| RT8059GJ6 | 2.5V–5.5V input; adjustable output (0.6V–VIN); 2MHz switching; 500mA output; 6-pin SOT-563 (1.6mm × 1.6mm) | Requires external feedback resistors; lacks voltage-positioning regulation; higher minimum input voltage excludes single-alkaline use | Choose for adjustable-output flexibility or cost-sensitive designs where 2MHz operation suffices; manual compensation needed for stability |
Compared with TPS62231DRYR and RT8059GJ6, the MAX8640ZELT15+T offers superior space efficiency via its 1.5mm × 1.0mm µDFN package, factory-set 1.5V output eliminating layout overhead, and voltage-positioning load regulation that inherently improves transient response without external tuning.
Availability
MAX8640ZELT15+T is available at Aetrix Electronics and suitable for microprocessor core power, portable medical sensors, and cell phone baseband applications requiring stable component supply, consistent parametric performance, and long-term lifecycle availability.
Supply support for MAX8640ZELT15+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer markets.
The MAX8640Y/MAX8640Z product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered handheld devices - prioritizing minimal external component count, sub-2mm² solution size, and robust transient performance without external compensation.
FAQ
What is the switching frequency of the MAX8640ZELT15+T?
The MAX8640ZELT15+T operates with a typical switching frequency of 3.9MHz at 1.5V output, enabling use of a tiny 1µH inductor and 2.2µF ceramic output capacitor. This high-frequency operation minimizes solution size while maintaining low output ripple and ultrasonic skip-mode operation down to 1mA loads.
Does the MAX8640ZELT15+T require external feedback resistors?
No, the MAX8640ZELT15+T does not require external feedback resistors. It features a factory-preset 1.5V output with ±1% initial accuracy, eliminating the need for external resistor dividers and saving PCB space and bill-of-materials cost. The OUT pin connects directly to the output capacitor and serves as the internal feedback sense point.
What package type is used for the MAX8640ZELT15+T?
The MAX8640ZELT15+T uses a 6-pin µDFN package measuring 1.5mm × 1.0mm with an exposed thermal pad. This RoHS-compliant, lead-free package provides excellent thermal performance in the smallest possible footprint, making it ideal for space-constrained portable electronics such as hearing aids, smartwatches, and wireless sensors.
How does the MAX8640ZELT15+T achieve low output voltage deviation under load changes?
The MAX8640ZELT15+T achieves low output voltage deviation using voltage-positioning load regulation, which senses feedback from the LX node instead of the output. This removes phase lag from the output capacitor, resulting in load regulation equal to the inductor's DC resistance times load current - cutting transient overshoot by ~50% compared to conventional buck regulators.
What is the shutdown current consumption of the MAX8640ZELT15+T?
The MAX8640ZELT15+T draws only 0.01µA typical shutdown current when the SHDN pin is pulled low. This ultra-low leakage preserves battery energy during extended standby periods in portable devices, and the internal power MOSFETs are fully disabled, leaving the LX node in high-impedance state.
MAX8640ZELT15+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 3.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX8640ZELT15+T FAQ
1.How can I place an order for MAX8640ZELT15+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640ZELT15+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 MAX8640ZELT15+T reliable?
The price and inventory of MAX8640ZELT15+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640ZELT15+T is usually 5 days.
3.What payment methods are accepted for MAX8640ZELT15+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640ZELT15+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640ZELT15+T?
MAX8640ZELT15+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640ZELT15+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 MAX8640ZELT15+T?
For technical support, including MAX8640ZELT15+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640ZELT15+T requirements.
6.How does Aetrix verify that MAX8640ZELT15+T is sourced from the original manufacturer or authorized distributors?
All MAX8640ZELT15+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 MAX8640ZELT15+T meets industry standards.
7.What is the process for return or replacement of MAX8640ZELT15+T?
All MAX8640ZELT15+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640ZELT15+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 MAX8640ZELT15+T part is unused and in its original packaging.
Return procedure for MAX8640ZELT15+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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