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Analog Devices Inc./Maxim Integrated MAX8640YELT82+T
- Part No.:
- MAX8640YELT82+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX8640YELT82+T.pdf
- Description:
- IC REG BUCK 2.85V 500MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,304
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Product details
Overview
MAX8640YELT82+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications. It delivers up to 500mA output current at a factory-preset 2.85V with ±1% initial accuracy, operates from a 2.7V–5.5V input, and switches at 1.5MHz using internal p-channel/n-channel MOSFETs in a 6-pin µDFN (1.5mm × 1.0mm) package.
For engineers reviewing the MAX8640YELT82+T datasheet, MAX8640YELT82+T pinout, MAX8640YELT82+T application, or MAX8640YELT82+T equivalent, key selection criteria include its ultrasonic skip-mode operation down to 1mA loads, 28µA quiescent current, voltage-positioning load regulation, and compatibility with tiny 2.2µH inductors and 4.7µF ceramic output capacitors.
Technical Context
The MAX8640YELT82+T implements a proprietary hysteretic PWM control scheme that enables fast line/load transient response and stable regulation without external compensation. Its voltage-positioning feedback architecture samples the LX node directly, eliminating phase lag from the output capacitor and enabling use of low-ESR ceramic capacitors while achieving load regulation equal to the inductor's DC resistance multiplied by load current.
This architecture yields halved peak-to-peak output-voltage excursions during load transients versus conventional buck converters. Internal synchronous rectification replaces the external Schottky diode, and fast soft-start eliminates inrush current-reducing input capacitor requirements for battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 2.85V with ±1% initial accuracy at TA = +25°C - eliminates external resistor divider and ensures precise core/I/O rail compliance. |
| Switching Frequency | 1.5MHz - balances efficiency and component size; enables use of compact 2.2µH inductor and 4.7µF output capacitor. |
| Max Output Current | 500mA guaranteed - supports power delivery for microprocessor I/O domains or baseband processors in handheld devices. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle portable applications such as PDAs and MP3 players. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ (fully charged), Li-polymer, and dual-cell alkaline/NiMH sources. |
| Shutdown Current | 0.01µA typical - reduces system standby power to negligible levels when disabled via SHDN pin. |
| Operating Temp | -40°C to +85°C - qualified for industrial and consumer handheld environments without derating. |
Pinout & Package
MAX8640YELT82+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 PCB layouts and efficient thermal dissipation in ultra-thin form factors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Inductor connection node | High-current switching node tied to internal p-channel and n-channel MOSFET drains; requires short, wide trace routing to minimize EMI and voltage spikes. |
| GND (Pins 2 & 5) | Power ground | Two dedicated ground pins must be connected together directly under the IC and tied to input/output capacitor grounds to ensure low-impedance return path and loop stability. |
| OUT | Output voltage sense | Internally connected to feedback network; bypassed with ceramic capacitor close to OUT and GND to stabilize regulation and reduce noise sensitivity. |
| SHDN | Active-low enable control | Logic-low ≥10µs after VIN exceeds UVLO (2.6V) resets internal logic; enables system-level power sequencing and zero-quiescent standby mode. |
| IN | Input supply | Accepts 2.7V–5.5V input; requires local 2.2µF ceramic bypass capacitor placed adjacent to IN and GND pins to suppress switching noise and supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning load regulation | Load regulation error equals inductor DCR × ILOAD - minimizes output droop and halves transient overshoot vs. traditional buck regulators. |
| Ultrasonic pulse-skipping mode | Operates >20kHz down to 1mA loads - eliminates audible noise while maintaining 28µA quiescent current and low output ripple. |
| Internal synchronous rectification | Replaces external Schottky diode - improves full-load efficiency by ~8–12% and reduces solution footprint and BOM count. |
| Fast soft-start | Eliminates inrush current at startup - allows use with high-impedance sources like coin cells and Li+ batteries without input voltage sag. |
| Small external components | Supports 2.2µH inductor + 4.7µF output capacitor - enables total solution area < 8mm², ideal for smartphones and wearables. |
Applications
| Microprocessor I/O Power | Cell Phone Baseband Supply |
|---|---|
Use Scenario: Powering I/O banks of low-power microcontrollers or DSPs in battery-operated instrumentation. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 2.85V rail with fast transient response to handle digital switching noise. Use Value: Voltage-positioning regulation reduces output excursion during I/O toggle events, improving signal integrity and reducing need for bulk capacitance. | Use Scenario: Supplying baseband processor core or memory interface in GSM/UMTS feature phones. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC-DC converter operating from single-cell Li+ battery across full discharge range. Use Value: 1.5MHz switching frequency avoids AM radio band interference; 28µA quiescent current extends standby time between calls. |
| Portable Media Player Logic Rail | Handheld Medical Sensor Module |
Use Scenario: Generating clean 2.85V logic supply for audio codec, display driver, and flash memory in MP3 players. IC Role / Device Role / Timing Role: Compact, low-ripple power source with integrated soft-start to prevent brownout during playback startup. Use Value: Tiny µDFN package and minimal external components enable integration into sub-10mm-thick enclosures without thermal compromise. | Use Scenario: Powering low-power analog front-end and BLE radio in disposable diagnostic sensors. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter supporting intermittent wake-up cycles and long shelf life on primary lithium battery. Use Value: 0.01µA shutdown current and factory-preset output eliminate trimming resistors and simplify FDA-cleared design verification. |
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 |
|---|---|---|---|
| TPS62231DRYT | 2.85V fixed output, 3MHz switching, 300mA rated, 6-pin WSON (2mm × 2mm) | Lower max output current; higher switching frequency increases EMI filtering complexity | Select if board layout allows larger 2mm × 2mm footprint and system prioritizes smaller inductor over current capability. |
| RT8059GJ6 | 2.85V fixed output, 1.5MHz switching, 500mA rated, 6-pin SOT-563 (1.6mm × 1.6mm) | Slightly larger package than µDFN; no voltage-positioning architecture - higher transient overshoot | Select if cost sensitivity outweighs transient performance needs and existing SOT-563 land pattern reuse is required. |
Compared with TPS62231DRYT and RT8059GJ6, the MAX8640YELT82+T uniquely combines 500mA capability, 1.5MHz operation, µDFN miniaturization, and voltage-positioning load regulation-making it optimal for space-constrained, transient-sensitive portable designs where output stability under dynamic load is critical.
Availability
MAX8640YELT82+T is available at Aetrix Electronics and suitable for microprocessor I/O power, cell phone baseband supply, and portable media player logic rails requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MAX8640YELT82+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 is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, sensing, and communications.
The MAX8640Y/MAX8640Z product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered handheld electronics-emphasizing minimal external components, low quiescent current, and robust transient behavior.
FAQ
What is the factory-preset output voltage of the MAX8640YELT82+T?
The MAX8640YELT82+T has a factory-preset output voltage of 2.85V with ±1% initial accuracy at +25°C. This fixed output eliminates the need for external feedback resistors and ensures consistent rail generation across production units without calibration. The "82" suffix in the part number explicitly denotes the 2.85V variant per Maxim's Selector Guide.
Does the MAX8640YELT82+T require external compensation components?
No, the MAX8640YELT82+T does not require external compensation components. Its proprietary hysteretic PWM control scheme and voltage-positioning feedback architecture-sampling the LX node directly-provide inherent loop stability. This enables reliable operation with only a 2.2µH inductor and 4.7µF ceramic output capacitor, simplifying design and reducing BOM count.
What package type and dimensions does the MAX8640YELT82+T use?
The MAX8640YELT82+T uses a 6-pin µDFN package measuring 1.5mm × 1.0mm with an exposed thermal pad. This RoHS-compliant, lead-free package is documented under package code L611-1 (document no. 21-0147) and supports high-density layouts in ultra-thin portable devices. Pin 1 is marked by a laser-etched "OW" top mark.
How does the MAX8640YELT82+T manage light-load efficiency?
The MAX8640YELT82+T manages light-load efficiency via ultrasonic pulse-skipping mode, which activates automatically below ~100mA. In this mode, switching frequency drops while remaining above 20kHz to avoid audible noise, and quiescent current remains at 28µA typical. This preserves battery runtime in standby or intermittent-use scenarios without sacrificing output regulation.
Can the MAX8640YELT82+T be used with a 1µH inductor?
No, the MAX8640YELT82+T is a MAX8640Y-series device optimized for 2.2µH inductors at 1.5MHz operation. Using a 1µH inductor-intended for the MAX8640Z series-would cause excessive peak currents, reduced efficiency, and potential instability. The Selector Guide explicitly specifies 2.2µH for all MAX8640YELT variants including MAX8640YELT82+T.
MAX8640YELT82+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:
- -
MAX8640YELT82+T FAQ
1.How can I place an order for MAX8640YELT82+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YELT82+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 MAX8640YELT82+T reliable?
The price and inventory of MAX8640YELT82+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YELT82+T is usually 5 days.
3.What payment methods are accepted for MAX8640YELT82+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YELT82+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YELT82+T?
MAX8640YELT82+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YELT82+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 MAX8640YELT82+T?
For technical support, including MAX8640YELT82+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YELT82+T requirements.
6.How does Aetrix verify that MAX8640YELT82+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YELT82+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 MAX8640YELT82+T meets industry standards.
7.What is the process for return or replacement of MAX8640YELT82+T?
All MAX8640YELT82+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YELT82+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 MAX8640YELT82+T part is unused and in its original packaging.
Return procedure for MAX8640YELT82+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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