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Analog Devices Inc./Maxim Integrated MAX8640YELT15+T
- Part No.:
- MAX8640YELT15+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX8640YELT15+T.pdf
- Description:
- IC REG BUCK 1.5V 500MA 6UDFN
- Quantity:
- Payment:
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Inventory:1,692
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Product details
Overview
MAX8640YELT15+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications, delivering 500mA output current at a factory-preset 1.5V output voltage with ±1% initial accuracy, operating at up to 2MHz switching frequency, and consuming only 28µA quiescent current - used in microprocessor core power and handheld device I/O rails.
For engineers reviewing the MAX8640YELT15+T datasheet, MAX8640YELT15+T pinout, MAX8640YELT15+T application, or MAX8640YELT15+T equivalent, key selection criteria include guaranteed 500mA load capability, ultrasonic pulse-skipping mode down to 1mA, voltage-positioning load regulation, fast transient response, and compatibility with tiny 2.2µH/4.7µF external components.
Technical Context
The MAX8640YELT15+T implements a proprietary hysteretic PWM control scheme enabling stable regulation across 2.7V–5.5V input while maintaining low output ripple at all loads. Its voltage-positioning feedback architecture samples the LX node directly, eliminating phase lag from output capacitance and enabling use of small ceramic capacitors without loop instability.
It features internal synchronous rectification using integrated p-channel and n-channel MOSFETs (RONP = 0.6Ω typ, RONN = 0.35Ω typ), fast soft-start to suppress inrush current, and shutdown mode reducing supply current to 0.01µA. The device enters ultrasonic skip mode below 100mA loads, preserving efficiency while avoiding audible noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.5V with ±1% initial accuracy - eliminates external resistor divider and ensures tight regulation at point-of-load. |
| Max Output Current | 500mA guaranteed - supports core logic and I/O rails of low-power microprocessors and DSPs. |
| Switching Frequency | Up to 2MHz - enables use of compact 2.2µH inductor and 4.7µF ceramic output capacitor, minimizing board area. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle portable 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 supplies. |
| Load Regulation | Voltage-positioning type - output droop equals inductor DCR × load current, halving peak-to-peak excursion during transients. |
| Shutdown Current | 0.01µA typical - enables deep-sleep power states in battery-powered devices. |
Pinout & Package
MAX8640YELT15+T is housed in a lead-free, RoHS-compliant 6-pin µDFN package measuring 1.5mm × 1.0mm - ideal for ultra-dense portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Inductor switch node | High-current connection to internal p-FET drain and n-FET source; requires short, wide trace routing to minimize EMI and switching losses. |
| GND (pins 2 & 5) | Power ground | Must be connected together directly under IC and tied to input/output capacitor grounds to ensure stable reference and low-noise operation. |
| OUT | Output sense and feedback | Internally connected to voltage-regulation network; bypassed with ceramic capacitor near pin to stabilize loop and reduce ripple. |
| SHDN | Active-low enable | Logic-controlled shutdown input; must be held low ≥10µs after VIN exceeds UVLO (2.6V) to reset internal logic. |
| IN | Input power supply | Accepts 2.7V–5.5V; requires local 2.2µF ceramic decoupling capacitor placed adjacent to pin and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Replaces external Schottky diode, improving full-load efficiency by ~10–15% and eliminating diode forward drop loss. |
| Ultrasonic pulse-skipping mode | Maintains switching above 20kHz down to 1mA load, preventing audible coil whine in consumer audio-sensitive designs. |
| Voltage-positioning load regulation | Reduces load-transient overshoot/undershoot by 50% vs. conventional buck regulators, simplifying dynamic performance validation. |
| Fast soft-start | Eliminates inrush current spikes, allowing use with high-impedance sources like coin cells or long PCB traces without input rail collapse. |
| Factory-preset output | 1.5V output set internally - removes need for external feedback resistors, saving BOM cost and layout area in high-volume production. |
Applications
| Microprocessor Core Power | I/O Power Supply |
|---|---|
Use Scenario: Powering ARM Cortex-M series MCU cores requiring tightly regulated 1.5V at up to 500mA peak current during burst processing. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable core voltage with fast line/load transient response to prevent brownouts during clock scaling. Use Value: Voltage-positioning regulation minimizes VDD droop during 10–500mA load steps, ensuring reliable operation without external compensation. |
Use Scenario: Supplying 1.5V to SDIO, USB PHY, or GPIO banks in smartphones and wearables where space and efficiency are critical. IC Role / Device Role / Timing Role: Secondary buck converter providing clean, low-noise I/O rail decoupled from noisy system power domains. Use Value: 2MHz switching and tiny 2.2µH/4.7µF component set enable <15mm² total solution size, fitting within narrow board margins. |
| Cell Phone Baseband | Portable Medical Sensor Node |
Use Scenario: Regulating 1.5V for LTE/WCDMA baseband processors in slim-profile handsets with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: High-frequency buck converter operating in ultrasonic skip mode during idle periods to extend talk time. Use Value: 28µA quiescent current and 0.01µA shutdown current directly improve standby battery life by >30% versus legacy solutions. |
Use Scenario: Powering low-power biosensor ASICs (e.g., ECG, SpO₂) in disposable patch monitors powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Efficient step-down regulator enabling 1.5V operation from declining 3.0–2.7V battery voltage over multi-week deployment. Use Value: Wide 2.7–5.5V input range and stable regulation down to 2.7V VIN ensure uninterrupted sensor data acquisition until battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.5V output, 3MHz switching, 400mA max output, 17µA IQ - smaller IQ but lower current rating. | Targeted at sub-400mA logic rails; lacks voltage-positioning load regulation and ultrasonic skip mode. | Select when lower quiescent current is prioritized over 500mA headroom and transient performance. |
| RT8059GJ6 | Adjustable output (0.6–3.3V), 2MHz, 500mA, 30µA IQ - requires external feedback resistors and larger output cap. | Suitable for multi-rail systems needing programmable outputs; adds BOM cost and layout complexity. | Select when design requires flexible output voltage tuning rather than factory-preset simplicity and minimal footprint. |
Compared with TPS62231DRYR and RT8059GJ6, the MAX8640YELT15+T delivers superior transient suppression via voltage-positioning regulation, eliminates feedback components for 1.5V use, and maintains ultrasonic operation down to 1mA - making it optimal for space- and noise-sensitive 500mA portable power rails.
Availability
MAX8640YELT15+T is available at Aetrix Electronics and suitable for microprocessor core power, handheld I/O supply, and portable medical sensor node applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for MAX8640YELT15+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, automotive, and portable applications.
The MAX8640Y/MAX8640Z product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered handheld devices where board area, quiescent current, and transient response are critical constraints.
FAQ
What is the output voltage of the MAX8640YELT15+T and how is it set?
The MAX8640YELT15+T has a factory-preset output voltage of 1.5V, achieved through internal trimming during wafer test - no external feedback resistors are required. This configuration ensures ±1% initial accuracy and eliminates component count and layout area associated with adjustable regulators, making it ideal for high-volume portable designs where consistency and miniaturization are essential. The MAX8640YELT15+T achieves this fixed output without sacrificing regulation stability or transient performance.
Does the MAX8640YELT15+T support ultrasonic operation at light loads?
Yes, the MAX8640YELT15+T automatically enters ultrasonic pulse-skipping mode at loads below 100mA, maintaining switching frequencies above 20kHz down to 1mA typical - preventing audible noise from inductor vibration in audio-sensitive applications like smartphones and hearing aids. This behavior is inherent to its proprietary hysteretic PWM control scheme and does not require external configuration. The MAX8640YELT15+T sustains this ultrasonic operation while delivering only 28µA quiescent current, optimizing both acoustic and power performance.
What package type and dimensions does the MAX8640YELT15+T use?
The MAX8640YELT15+T uses a lead-free, RoHS-compliant 6-pin µDFN package measuring 1.5mm × 1.0mm with an exposed pad for thermal dissipation. This ultra-small footprint is significantly more compact than the SC70 variant and enables placement in dense areas of portable PCBs, such as beneath displays or near RF modules. The package is specified for operation from –40°C to +85°C and supports standard reflow soldering profiles. The MAX8640YELT15+T's µDFN form factor directly contributes to its suitability for next-generation wearable and ingestible electronics.
How does the MAX8640YELT15+T handle load transients compared to conventional buck converters?
The MAX8640YELT15+T employs voltage-positioning load regulation - sampling the LX node instead of the output - which removes phase lag from output capacitance and yields load regulation equal to inductor DCR × load current. This architecture reduces peak-to-peak output-voltage excursions by approximately 50% during rapid load steps (e.g., 10mA ↔ 500mA), eliminating the need for large bulk capacitors or complex loop compensation. In real-world use, this means the MAX8640YELT15+T maintains tighter regulation under dynamic MCU core loading than conventional buck ICs with identical external components.
What are the recommended external components for the MAX8640YELT15+T?
The MAX8640YELT15+T is optimized for a 2.2µH shielded inductor (e.g., Murata LQM31P series) and 4.7µF X5R/X7R ceramic output capacitor placed adjacent to the OUT and GND pins. An additional 2.2µF ceramic input capacitor is required at the IN pin. All capacitors must maintain rated capacitance under DC bias and temperature; typical footprint savings come from using 0402 or 0603 case sizes. These values are validated in the MAX8640YELT15+T Selector Guide and ensure >85% efficiency at 3.6V input and 500mA load - confirming the MAX8640YELT15+T's target use case in compact, high-efficiency portable power systems.
MAX8640YELT15+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX8640YELT15+T FAQ
1.How can I place an order for MAX8640YELT15+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YELT15+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 MAX8640YELT15+T reliable?
The price and inventory of MAX8640YELT15+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YELT15+T is usually 5 days.
3.What payment methods are accepted for MAX8640YELT15+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YELT15+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YELT15+T?
MAX8640YELT15+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YELT15+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 MAX8640YELT15+T?
For technical support, including MAX8640YELT15+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YELT15+T requirements.
6.How does Aetrix verify that MAX8640YELT15+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YELT15+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 MAX8640YELT15+T meets industry standards.
7.What is the process for return or replacement of MAX8640YELT15+T?
All MAX8640YELT15+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YELT15+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 MAX8640YELT15+T part is unused and in its original packaging.
Return procedure for MAX8640YELT15+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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