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Analog Devices Inc./Maxim Integrated MAX8640YELT12+
- Part No.:
- MAX8640YELT12+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8640YELT12+.pdf
- Description:
- IC REG BUCK 1.2V 500MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,712
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Product details
Overview
MAX8640YELT12+ from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications, delivering 500mA output current at factory-preset 1.2V with ±1% initial accuracy, 2MHz switching frequency, and 28µA quiescent current. It operates from 2.7V to 5.5V input and uses internal synchronous rectification to eliminate external Schottky diodes.
For engineers reviewing the MAX8640YELT12+ datasheet, MAX8640YELT12+ pinout, MAX8640YELT12+ application, or MAX8640YELT12+ equivalent, key selection criteria include its µDFN (1.5mm × 1.0mm) package size, voltage-positioning load regulation, ultrasonic skip mode down to 1mA, and compatibility with 2.2µH inductors and 4.7µF ceramic output capacitors.
Technical Context
The MAX8640YELT12+ implements a proprietary hysteretic PWM control scheme that dynamically adjusts switching timing to maintain regulation while enabling fast line/load transient response and low output ripple across all loads. Its voltage-positioning feedback architecture samples the LX node directly, removing phase lag from the output capacitor and yielding load regulation equal to the inductor's DC resistance multiplied by load current.
It integrates both high-side p-channel and low-side n-channel MOSFETs with on-resistances of 0.6Ω (pFET) and 0.35Ω (nFET), supports active-low shutdown with 0.1µA shutdown current, and features internal soft-start to suppress inrush current-enabling stable startup from high-impedance sources like Li+ batteries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.2V with ±1% initial accuracy at +25°C - eliminates external resistor divider and ensures precise core/I/O rail generation. |
| Switching Frequency | Up to 2MHz - enables use of compact 2.2µH inductors and reduces EMI fundamental frequency above audible range. |
| Max Output Current | 500mA guaranteed - sufficient for powering DSP cores, FPGA I/O banks, or baseband processors in handheld devices. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle modes without sacrificing regulation performance. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ (2.7–4.2V), 3.3V rails, and 5V USB-powered systems. |
| Load Regulation | Voltage positioning: ΔVOUT = IL × DCR(L) - minimizes overshoot/undershoot during load transients and halves peak-to-peak excursion vs. conventional buck converters. |
| Shutdown Current | 0.1µA typical - enables deep-sleep power states in portable electronics with negligible standby drain. |
Pinout & Package
MAX8640YELT12+ is housed in a lead-free 6-pin µDFN package measuring 1.5mm × 1.0mm with 0.5mm pitch, optimized for ultra-dense PCB layouts in mobile and wearable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Inductor switch node | Connects to internal pFET drain and nFET source; carries high-frequency AC current - requires short, wide trace and local ground pour for EMI control. |
| GND (Pins 2 & 5) | Power and signal ground | Must be connected together under IC and tied directly to input/output capacitor grounds to minimize ground bounce and ensure loop stability. |
| OUT | Feedback sense input | Internally connected to voltage-divider network; bypass with ceramic capacitor ≤2mm from OUT/GND pins to stabilize regulation loop. |
| SHDN | Active-low enable control | Pull low to enter 0.1µA shutdown; pull high or tie to IN for normal operation - supports system-level power sequencing. |
| IN | Main power input | Accepts 2.7V–5.5V; requires local 2.2µF ceramic capacitor placed adjacent to IN/GND pins to suppress switching noise and supply current spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Replaces external Schottky diode, reducing conduction loss and improving full-load efficiency by up to 12% versus asynchronous designs. |
| Ultrasonic pulse-skipping mode | Maintains switching >20kHz down to 1mA load - prevents audible noise in audio-sensitive applications and preserves light-load efficiency. |
| Voltage-positioning feedback | Uses LX node sampling to eliminate output-capacitor phase lag, enabling stable loop response with <10µF ceramic output capacitance. |
| Fast soft-start | Internally controlled ramp limits inrush current during startup - allows direct connection to Li+ cells or weak supplies without input capacitor oversizing. |
| ±1% output voltage accuracy | Ensures reliable operation of low-voltage digital cores (e.g., ARM Cortex-M, DSPs) without margining or post-regulation trimming. |
Applications
| Microprocessor Core Power | I/O Rail Generation |
|---|---|
Use Scenario: Powering ARM-based microcontroller cores requiring stable 1.2V at up to 500mA in battery-operated IoT edge nodes. IC Role / Device Role / Timing Role: Primary step-down regulator supplying processor VDDCORE with tight voltage tolerance and fast transient response. Use Value: Voltage-positioning load regulation reduces dynamic voltage droop during burst-mode execution, preventing core resets or timing violations. |
Use Scenario: Generating 1.2V I/O supply for FPGA configuration banks or high-speed serial interface receivers in portable test equipment. IC Role / Device Role / Timing Role: Dedicated point-of-load converter ensuring clean, low-noise I/O voltage independent of main system rail fluctuations. Use Value: 2MHz switching and internal soft-start enable rapid power-up sequencing aligned with FPGA configuration clocks, minimizing boot delay. |
| Cell Phone Baseband Power | Wearable Sensor Hub Supply |
Use Scenario: Delivering 1.2V to cellular baseband processors in slim smartphones where board area is constrained by camera modules and batteries. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter operating from single-cell Li+ input to support bursty data transmission cycles. Use Value: µDFN package (1.5mm × 1.0mm) and 2.2µH/4.7µF external component set reduce total solution footprint to <3.5mm² - critical for Z-height-limited designs. |
Use Scenario: Supplying 1.2V to ultra-low-power sensor fusion hubs (e.g., accelerometer + gyroscope + BLE SoC) in fitness trackers. IC Role / Device Role / Timing Role: Always-on power stage maintaining regulation during sleep/wake transitions with minimal quiescent current penalty. Use Value: 28µA quiescent current and ultrasonic skip mode extend coin-cell or small LiPo battery life beyond 12 months in typical usage profiles. |
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 |
|---|---|---|---|
| Texas Instruments TPS62231DRYR | Fixed 1.2V output, 3MHz switching, 400mA rated, 1.2mm × 1.2mm WSON package - smaller footprint but lower current capability. | Best suited for sub-400mA logic rails where minimal board area is prioritized over headroom. | Select when max load is ≤400mA and PCB real estate is more constrained than thermal budget. |
| Analog Devices ADP2301ARMZ-1.2-R7 | 1.2V fixed output, 700mA rated, 1.4MHz switching, 6-lead SOT-23 package - higher current, larger package, no skip mode. | Suitable for industrial sensors or PLC I/O modules needing robust 700mA delivery with wider input range (3.0–20V). | Choose when higher output current and extended input voltage range outweigh size and light-load efficiency requirements. |
Compared with TPS62231DRYR and ADP2301ARMZ-1.2-R7, the MAX8640YELT12+ uniquely balances 500mA capability, 2MHz operation, ultrasonic skip mode, and the smallest possible µDFN footprint - making it optimal for next-generation handhelds where battery life, transient response, and miniaturization are co-prioritized.
Availability
MAX8640YELT12+ is available at Aetrix Electronics and suitable for microprocessor core power, I/O rail generation, cell phone baseband power, and wearable sensor hub supply requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for MAX8640YELT12+ 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 MAX8640Y/MAX8640Z product line was designed specifically for ultra-compact, high-efficiency power conversion in battery-powered portable electronics - emphasizing minimal external component count, low quiescent current, and robust transient behavior.
FAQ
What is the output voltage setting of the MAX8640YELT12+?
The MAX8640YELT12+ is factory-preset to deliver a nominal 1.2V output with ±1% initial accuracy at +25°C and ±2% over the full -40°C to +85°C operating temperature range. This fixed output eliminates the need for external feedback resistors and ensures repeatable performance across production units without calibration.
Which package type does the MAX8640YELT12+ use?
The MAX8640YELT12+ uses a lead-free 6-pin µDFN package measuring 1.5mm × 1.0mm with 0.5mm pin pitch. This ultra-compact package is explicitly designated in the ordering code "ELT" and confirmed in Maxim's package documentation as L611-1 (document no. 21-0147).
Does the MAX8640YELT12+ support shutdown functionality?
Yes, the MAX8640YELT12+ features an active-low SHDN pin (Pin 4). Pulling SHDN to GND reduces supply current to 0.1µA typical and places the internal MOSFETs in high-impedance state. Connecting SHDN to IN or a logic-high signal enables normal operation - supporting flexible system-level power sequencing.
What external components are required for basic operation of the MAX8640YELT12+?
The MAX8640YELT12+ requires only three external components for basic operation: a 2.2µH power inductor (connected between LX and OUT), a 4.7µF ceramic output capacitor (between OUT and GND), and a 2.2µF ceramic input capacitor (between IN and GND). No external feedback resistors or compensation networks are needed due to factory presetting and internal voltage-positioning architecture.
How does the MAX8640YELT12+ achieve low output ripple at light loads?
The MAX8640YELT12+ maintains low output ripple at light loads by automatically entering ultrasonic pulse-skipping mode below ~100mA, keeping switching frequency above 20kHz while reducing quiescent current to 28µA. Unlike audible-frequency skip modes, this preserves EMI compliance and eliminates acoustic noise in sensitive audio or medical applications.
MAX8640YELT12+ 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):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 1.8MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX8640YELT12+ FAQ
1.How can I place an order for MAX8640YELT12+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YELT12+ 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 MAX8640YELT12+ reliable?
The price and inventory of MAX8640YELT12+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YELT12+ is usually 5 days.
3.What payment methods are accepted for MAX8640YELT12+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YELT12+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YELT12+?
MAX8640YELT12+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YELT12+ 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 MAX8640YELT12+?
For technical support, including MAX8640YELT12+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YELT12+ requirements.
6.How does Aetrix verify that MAX8640YELT12+ is sourced from the original manufacturer or authorized distributors?
All MAX8640YELT12+ 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 MAX8640YELT12+ meets industry standards.
7.What is the process for return or replacement of MAX8640YELT12+?
All MAX8640YELT12+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YELT12+, 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 MAX8640YELT12+ part is unused and in its original packaging.
Return procedure for MAX8640YELT12+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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