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Analog Devices Inc./Maxim Integrated MAX8640ZELT18+
- Part No.:
- MAX8640ZELT18+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8640ZELT18+.pdf
- Description:
- IC REG BUCK 1.8V 500MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:152
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Product details
Overview
The MAX8640ZELT18+ from Maxim Integrated is a synchronous step-down DC-DC converter delivering 500mA output current at a factory-preset 1.8V output voltage, operating with up to 4MHz switching frequency, internal synchronous rectification, and 28µA quiescent current - optimized for space-constrained portable applications such as smartphones and PDAs.
For engineers reviewing the MAX8640ZELT18+ datasheet, MAX8640ZELT18+ pinout, MAX8640ZELT18+ application, or MAX8640ZELT18+ equivalent, key selection criteria include its 1.8V fixed output, 4MHz operation enabling 1µH inductor/2.2µF capacitor use, ±1% initial output accuracy, ultrasonic skip mode down to 1mA loads, and µDFN (1.5mm × 1.0mm) lead-free package compatibility with high-density PCB layouts.
Technical Context
The MAX8640ZELT18+ employs a proprietary hysteretic PWM control scheme that dynamically adjusts switching frequency up to 4MHz to balance efficiency and external component size. Its voltage-positioning feedback architecture samples the LX node directly, eliminating phase lag from output capacitance and enabling stable regulation with ultra-small ceramic capacitors.
This architecture yields load regulation equal to the inductor's DC resistance multiplied by load current, reducing peak-to-peak output-voltage excursions by ~50% during transients versus conventional buck converters. Internal fast soft-start eliminates inrush current, while shutdown mode reduces supply current to 0.1µA (typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.8V ±1% initial accuracy - eliminates external resistor divider and ensures precise core/I/O rail compliance. |
| Switching Frequency | Up to 4MHz - enables use of 1µH inductor and 2.2µF output capacitor, minimizing board area in handheld devices. |
| Output Current | Guaranteed 500mA - supports microprocessor core or I/O power rails in battery-powered systems. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle portable applications. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ (3.0–4.2V), alkaline (up to 4.5V), and USB-powered systems. |
| Shutdown Current | 0.1µA typical - enables deep-sleep modes without compromising system-level power budget. |
| Package | 6-pin µDFN (1.5mm × 1.0mm, 0.8mm height) - ultra-compact footprint for high-density mobile PCBs. |
Pinout & Package
The MAX8640ZELT18+ is housed in a lead-free, RoHS-compliant 6-pin µDFN package measuring 1.5mm × 1.0mm × 0.8mm, with exposed thermal pad for enhanced power dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LX) | Inductor switch node | Connects to internal p-channel and n-channel MOSFET drains; carries high di/dt switching current - requires short, wide trace routing. |
| 2, 5 (GND) | Ground terminals | Two dedicated ground pins must be connected together directly under IC and tied to input/output capacitor grounds for low-impedance return path. |
| 3 (OUT) | Output sense input | Internally connected to feedback network; bypass with ceramic capacitor placed adjacent to pin 3 and pin 2 for loop stability. |
| 4 (SHDN) | Active-low enable/shutdown | Pull high to IN or logic level ≥1.4V for operation; pull low ≤0.4V to enter 0.1µA shutdown - no external pull-up required. |
| 6 (IN) | Input supply | Accepts 2.7V–5.5V; bypass with ceramic capacitor placed adjacent to pin 6 and pin 5 to suppress switching noise and reduce input ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning load regulation | Load regulation = IL × DCR(L), reducing transient overshoot by ~50% vs. traditional buck regulators - critical for stable microprocessor core voltage. |
| Ultrasonic skip mode | Maintains switching above 20kHz down to 1mA load - eliminates audible noise in consumer audio devices and wearables. |
| Internal synchronous rectification | Replaces external Schottky diode, improving light-load efficiency and eliminating diode forward-voltage drop and thermal management concerns. |
| Fast soft-start | Prevents inrush current during startup, reducing stress on input source (e.g., Li+ cells) and allowing smaller input capacitors. |
| High-frequency operation (4MHz) | Enables 1µH inductor and 2.2µF output capacitor - cuts total solution size by >40% vs. 2MHz alternatives like MAX8640Y variants. |
Applications
| Smartphone Core Power | Digital Camera I/O Supply |
|---|---|
Use Scenario: Powers ARM-based application processor cores requiring tightly regulated 1.8V at up to 500mA with minimal board area. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing stable core voltage with fast transient response to dynamic CPU load changes. Use Value: 4MHz operation allows 1µH inductor placement adjacent to processor BGA, reducing routing length and EMI coupling. |
Use Scenario: Supplies image sensor interface and memory I/O rails in compact digital still cameras (DSCs) where thermal headroom is limited. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter delivering clean 1.8V power with low output ripple (<10mVpp) across full load range. Use Value: 28µA quiescent current extends standby time between shots; ultrasonic skip mode prevents audible coil whine during viewfinder operation. |
| Bluetooth Headset Audio Codec | Wearable Fitness Sensor Hub |
Use Scenario: Powers stereo audio codec and Bluetooth radio subsystem in battery-operated wireless headsets. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting burst-mode RF transmission and continuous audio playback. Use Value: Fast line- and load-transient response (<10µs) maintains 1.8V rail stability during RF transmit bursts, preventing audio artifacts. |
Use Scenario: Supplies motion sensor cluster (accelerometer, gyroscope, heart-rate monitor) in wrist-worn fitness trackers. IC Role / Device Role / Timing Role: Low-quiescent-current buck converter enabling multi-day battery life with intermittent sensor sampling. Use Value: 0.1µA shutdown current preserves battery during sleep; µDFN package fits within 10mm × 10mm wearable PCB constraints. |
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 |
|---|---|---|---|
| MAX8640YELT18+ | 2MHz switching frequency, 2.2µH/4.7µF recommended components, same 1.8V output and µDFN package. | Better peak efficiency (>90% at 200mA) but larger inductor/capacitor footprint; suited for thermally constrained but less space-critical designs. | Select MAX8640YELT18+ when maximizing efficiency at medium loads outweighs board-area savings. |
| TPS62231DRYT | 3MHz switching, 1.8V fixed output, 500mA rating, 6-pin WSON (2mm × 2mm), 25µA IQ. | Larger 2mm × 2mm package increases layout area; lacks voltage-positioning architecture - higher transient overshoot observed in test reports. | Choose TPS62231DRYT only if TI supply-chain alignment or qualification requirements override size/transient performance needs. |
Compared with MAX8640YELT18+ and TPS62231DRYT, the MAX8640ZELT18+ uniquely combines 4MHz operation, voltage-positioning feedback, and 1.5mm × 1.0mm µDFN to deliver the smallest total solution size and lowest transient voltage deviation for 1.8V/500mA portable power rails.
Availability
The MAX8640ZELT18+ is available at Aetrix Electronics and suitable for smartphone core power, digital camera I/O supply, and wearable sensor hub applications requiring stable component supply, consistent parametric performance, and long-term production availability.
Supply support for MAX8640ZELT18+ 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 small external components, low quiescent current, and fast transient response over raw peak efficiency.
FAQ
What is the output voltage of the MAX8640ZELT18+ and is it adjustable?
The MAX8640ZELT18+ features a factory-preset output voltage of 1.8V with ±1% initial accuracy. It is not adjustable - the feedback network is internal and fixed, eliminating external resistors. This simplifies design, improves accuracy, and reduces bill-of-materials count for applications requiring precisely 1.8V, such as microprocessor I/O rails or sensor interfaces. The MAX8640ZELT18+ does not support external feedback configuration.
What package type and dimensions does the MAX8640ZELT18+ use?
The MAX8640ZELT18+ uses a 6-pin µDFN package with dimensions of 1.5mm × 1.0mm × 0.8mm and a 0.5mm pin pitch. It includes an exposed thermal pad for improved heat dissipation. This ultra-compact lead-free/RoHS-compliant package is optimized for high-density portable PCBs where board area is at a premium. The MAX8640ZELT18+ is not offered in SC70 or other packages.
Does the MAX8640ZELT18+ require external compensation components?
No, the MAX8640ZELT18+ does not require external compensation components. Its proprietary hysteretic PWM control scheme and voltage-positioning feedback architecture (sampling the LX node) provide inherent loop stability with only a ceramic output capacitor. This eliminates the need for external RC networks or compensation pins, reducing design complexity and component count. The MAX8640ZELT18+ achieves stable operation with as little as 2.2µF output capacitance.
How does the MAX8640ZELT18+ handle light-load efficiency?
The MAX8640ZELT18+ automatically enters ultrasonic pulse-skipping mode below ~100mA load, maintaining switching frequency above 20kHz to avoid audible noise while achieving 28µA typical quiescent current. This mode minimizes switching losses at light loads without sacrificing transient response. Unlike forced-PWM converters, the MAX8640ZELT18+ sustains high efficiency across the full 1mA–500mA range without external control signals.
What are the absolute maximum ratings for input voltage and LX pin current on the MAX8640ZELT18+?
The MAX8640ZELT18+ has an absolute maximum input voltage (IN to GND) of +6V and a maximum LX RMS current rating of 0.8A. Exceeding these limits may cause permanent damage. The device operates safely within 2.7V–5.5V input range and delivers up to 500mA output current. The LX pin integrates internal clamp diodes to IN and GND - forward-biasing these diodes must remain within the package's power-dissipation limit, as specified in the datasheet's Absolute Maximum Ratings table.
MAX8640ZELT18+ 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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- Up to 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX8640ZELT18+ FAQ
1.How can I place an order for MAX8640ZELT18+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640ZELT18+ 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 MAX8640ZELT18+ reliable?
The price and inventory of MAX8640ZELT18+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640ZELT18+ is usually 5 days.
3.What payment methods are accepted for MAX8640ZELT18+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640ZELT18+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640ZELT18+?
MAX8640ZELT18+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640ZELT18+ 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 MAX8640ZELT18+?
For technical support, including MAX8640ZELT18+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640ZELT18+ requirements.
6.How does Aetrix verify that MAX8640ZELT18+ is sourced from the original manufacturer or authorized distributors?
All MAX8640ZELT18+ 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 MAX8640ZELT18+ meets industry standards.
7.What is the process for return or replacement of MAX8640ZELT18+?
All MAX8640ZELT18+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640ZELT18+, 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 MAX8640ZELT18+ part is unused and in its original packaging.
Return procedure for MAX8640ZELT18+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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