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Analog Devices Inc./Maxim Integrated MAX8640YELT16+T
- Part No.:
- MAX8640YELT16+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8640YELT16+T.pdf
- Description:
- IC REG BUCK 1.6V 500MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,548
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Product details
Overview
MAX8640YELT16+T from Maxim Integrated is a synchronous step-down DC-DC converter delivering 500mA output current at a factory-preset 1.6V output voltage, operating up to 2MHz switching frequency with 28µA quiescent current and ±1% initial output accuracy. It uses internal synchronous rectification and voltage-positioning load regulation for low-output-ripple power delivery in space-constrained portable electronics.
For engineers reviewing the MAX8640YELT16+T datasheet, MAX8640YELT16+T pinout, MAX8640YELT16+T application, or MAX8640YELT16+T equivalent, key selection criteria include guaranteed 500mA output, 1.6V fixed output, 2MHz operation with 2.2µH/4.7µF external components, SC70/µDFN package compatibility, and shutdown current of 0.01µA.
Technical Context
The MAX8640YELT16+T implements a proprietary hysteretic PWM control scheme optimized for fast transient response and ultrasonic pulse-skipping mode down to 1mA loads. Its voltage-positioning feedback architecture samples the LX node to eliminate phase lag from output capacitance, enabling stable regulation with small ceramic capacitors and load regulation proportional to inductor DCR.
This device integrates p-channel and n-channel MOSFETs with on-resistances of 0.6Ω (pFET) and 0.35Ω (nFET), supports input voltages from 2.7V to 5.5V, and features internal soft-start to suppress inrush current while maintaining 95ns minimum on/off times for precise duty-cycle control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.6V with ±1% initial accuracy - eliminates external feedback resistors and ensures tight regulation across temperature. |
| Switching Frequency | Up to 2MHz - enables use of compact 2.2µH inductor and 4.7µF output capacitor without audible noise. |
| Output Current | Guaranteed 500mA - sufficient for microprocessor I/O rails or DSP core supplies in handheld devices. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle applications like PDAs and MP3 players. |
| 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 system rails. |
| Shutdown Current | 0.01µA typical - reduces system standby power to negligible levels during deep sleep modes. |
| Package | 6-pin µDFN (1.5mm × 1.0mm) - ultra-compact footprint ideal for space-limited PCB layouts in mobile devices. |
Pinout & Package
MAX8640YELT16+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-density placement and efficient heat dissipation in thin-profile portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LX | Inductor connection node tied to internal pFET drain and nFET source - carries high-frequency switching current; requires short, wide trace routing. |
| 2, 5 | GND | Dual ground terminals - must be connected together directly under IC and tied to low-impedance ground plane for stability and EMI reduction. |
| 3 | OUT | Output sense input - internally connected to feedback network; bypass with ceramic capacitor close to pin 3 and pin 2 for loop stability. |
| 4 | SHDN | Active-low shutdown control - logic-low disables converter and resets internal logic; requires ≥10µs low pulse after VIN exceeds UVLO threshold. |
| 6 | IN | Supply input (2.7V–5.5V) - bypass with ceramic capacitor adjacent to pin 6 and pin 5 to minimize input ripple and high-frequency noise. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning load regulation | Load regulation equals inductor DCR × load current - reduces transient overshoot by ~50% versus conventional buck converters. |
| Internal synchronous rectification | Replaces external Schottky diode - improves efficiency by eliminating forward-voltage drop and associated conduction losses. |
| Ultrasonic skip mode | Maintains switching above 20kHz down to 1mA load - prevents audible noise while preserving low quiescent current. |
| Fast soft-start | Eliminates inrush current - reduces required input capacitance and avoids voltage droop on weak sources like coin cells. |
| Hysteretic PWM control | No external compensation needed - simplifies design and enables fast line/load transient response (<40µs settling). |
Applications
| Microprocessor I/O Power | Cell Phone Baseband Core |
|---|---|
|
Use Scenario: Powers I/O banks of low-power microcontrollers in wearables and IoT edge nodes where board area is constrained. IC Role / Device Role / Timing Role: Primary 1.6V step-down regulator supplying digital I/O circuitry with fast transient response to handle burst-mode communication. Use Value: Delivers 500mA within 1.5mm × 1.0mm footprint while maintaining <20mV output ripple across 1mA–500mA load steps. |
Use Scenario: Supplies baseband processor core in dual-SIM smartphones requiring stable low-noise voltage during RF transmission bursts. IC Role / Device Role / Timing Role: Fixed-output buck converter providing clean 1.6V rail with ultrasonic skip mode to avoid interference with cellular band reception. Use Value: Achieves >85% efficiency at 300mA load and suppresses inrush current via internal soft-start, reducing input capacitor requirements by 40%. |
| PDA System Memory Rail | MP3 Player Audio Codec Supply |
|
Use Scenario: Generates 1.6V supply for SRAM and flash memory interfaces in legacy PDAs with limited PCB real estate. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter supporting memory read/write cycles with minimal voltage sag during peak current demand. Use Value: Maintains ±1% output accuracy over -40°C to +85°C and delivers full 500mA without thermal derating in µDFN package. |
Use Scenario: Powers stereo audio codec in portable MP3 players powered by single Li+ cell (3.0–4.2V). IC Role / Device Role / Timing Role: Low-noise, low-ripple power source for analog audio stages where PSRR and ripple rejection are critical. Use Value: Provides <10mVpp output ripple at 200kHz bandwidth and enables 28µA quiescent current to extend playback time between charges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | Fixed 1.6V output, 3MHz switching, 400mA rated, 2.0mm × 2.0mm WSON package | Lower output current rating and larger footprint - suitable only for sub-400mA loads with tighter layout constraints | Select when higher switching frequency is prioritized over output current headroom and board area is less constrained than µDFN allows. |
| RT8059GJ6 | Adjustable output (0.6–3.3V), 2MHz, 500mA, 1.6mm × 1.6mm TSOT-23-6 package | Requires external feedback resistors and has higher 55µA quiescent current - adds design complexity and reduces battery runtime | Choose only if adjustable output voltage is required and the added BOM cost and layout overhead are acceptable trade-offs. |
Compared with TPS62231DRYT and RT8059GJ6, the MAX8640YELT16+T provides superior current capability in the smallest footprint, lowest quiescent current, and zero-component fixed-output configuration - making it optimal for volume production of space- and power-sensitive portable devices.
Availability
MAX8640YELT16+T is available at Aetrix Electronics and suitable for microprocessor I/O power, cell phone baseband core supplies, and MP3 player audio codec rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8640YELT16+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 applications.
The MAX8640Y/MAX8640Z product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered handheld devices where size, quiescent current, and transient performance are critical.
FAQ
What is the output voltage of the MAX8640YELT16+T and how is it set?
The MAX8640YELT16+T has a factory-preset output voltage of 1.6V, achieved through internal trimming during wafer test. No external feedback resistors are required, simplifying layout and improving accuracy to ±1% at room temperature and ±2% over the full -40°C to +85°C operating range. This fixed output is confirmed in the Selector Guide and Electrical Characteristics table of the MAX8640Y/MAX8640Z datasheet.
Does the MAX8640YELT16+T require external compensation components?
No, the MAX8640YELT16+T does not require external compensation components. Its proprietary hysteretic PWM control architecture provides inherent loop stability, enabling direct use with small ceramic output capacitors (e.g., 4.7µF X5R) without additional RC networks. This is verified in the Detailed Description section and Typical Operating Characteristics plots showing stable startup and transient response without compensation.
What package type and dimensions does the MAX8640YELT16+T use?
The MAX8640YELT16+T uses a 6-pin µDFN package measuring 1.5mm × 1.0mm with an exposed thermal pad, per Package Information document 21-0147. This RoHS-compliant, lead-free package is distinct from the SC70 variant and is explicitly listed in the Ordering Information table with top mark "NG". Its compact size supports high-density PCB layouts in portable electronics.
Can the MAX8640YELT16+T operate from a single Li+ cell?
Yes, the MAX8640YELT16+T operates from an input voltage range of 2.7V to 5.5V, fully covering the discharge curve of a single Li+ cell (3.0V–4.2V). Its undervoltage lockout threshold of 2.44V–2.70V ensures reliable startup and shutdown behavior across the entire cell voltage range, as specified in the Absolute Maximum Ratings and Electrical Characteristics sections.
How does the MAX8640YELT16+T achieve low output ripple at light loads?
The MAX8640YELT16+T maintains low output ripple at light loads via ultrasonic pulse-skipping mode, which keeps switching frequency above 20kHz even down to 1mA output current. This avoids audible noise while preserving regulation accuracy and ripple suppression - demonstrated in the Light-Load Switching Waveforms (toc05) and Load-Transient Response (toc11, toc12) plots in the datasheet.
MAX8640YELT16+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 1.6V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX8640YELT16+T FAQ
1.How can I place an order for MAX8640YELT16+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YELT16+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 MAX8640YELT16+T reliable?
The price and inventory of MAX8640YELT16+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YELT16+T is usually 5 days.
3.What payment methods are accepted for MAX8640YELT16+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YELT16+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YELT16+T?
MAX8640YELT16+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YELT16+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 MAX8640YELT16+T?
For technical support, including MAX8640YELT16+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YELT16+T requirements.
6.How does Aetrix verify that MAX8640YELT16+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YELT16+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 MAX8640YELT16+T meets industry standards.
7.What is the process for return or replacement of MAX8640YELT16+T?
All MAX8640YELT16+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YELT16+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 MAX8640YELT16+T part is unused and in its original packaging.
Return procedure for MAX8640YELT16+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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