1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. MAX8640Z


Features and Benefits

  • Tiny SC70 and µDFN Packages
  • 500mA Guaranteed Output Current
  • 4MHz or 2MHz PWM Switching Frequency
  • Tiny External Components: 1µH/2.2µF or 2.2µH/4.7µF
  • 28µA Quiescent Current
  • Factory Preset Outputs from 0.8V to 2.5V
  • ±1% Initial Accuracy
  • Low Output Ripple at All Loads
  • Ultrasonic Skip Mode Down to 1mA Loads
  • Ultra-Fast Line- and Load-Transient Response
  • Fast Soft-Start Eliminates Inrush Current

Product Details

The MAX8640Y/MAX8640Z step-down converters are optimized for applications where small size, high efficiency, and low output ripple are priorities. They utilize a proprietary PWM control scheme that optimizes the switching frequency for high efficiency with small external components and maintains low output ripple voltage at all loads. The MAX8640Z switches at up to 4MHz to allow a tiny 1µH inductor and 2.2µF output capacitor. The MAX8640Y switches at up to 2MHz for higher efficiency while still allowing small 2.2µH and 4.7µF components. Output current is guaranteed up to 500mA, while typical quiescent current is 28µA. Factory-preset output voltages from 0.8V to 2.5V eliminate external feedback components.

Internal synchronous rectification greatly improves efficiency and replaces the external Schottky diode required in conventional step-down converters. Internal fast soft-start eliminates inrush current so as to reduce input capacitor requirements.

The MAX8640Y/MAX8640Z are available in the tiny 6-pin, SC70 (2.0mm x 2.1mm) and µDFN (1.5mm x 1.0mm) packages. Both packages are lead-free.


  • Cell Phones, PDAs, DSCs, MP3s
  • I/O Power
  • Microprocessor/DSP Core Power
  • Other Handhelds Where Space Is Limited

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Product Recommendations

MAX8640Z Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX8640ZELT12+ Material Declaration Reliability Data 6-LFCSP-1.5X1X0.75
MAX8640ZELT18+T Material Declaration Reliability Data 6-LFCSP-1.5X1X0.75
MAX8640ZEXT18+ Material Declaration Reliability Data Single Chip Package
MAX8640ZEXT18+T Material Declaration Reliability Data Single Chip Package
Wafer Fabrication Data MAX8640Z Reliability Data

Sample & Buy

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Buy Now Pricing

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List Pricing

(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

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