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MAX8640Y, MAX8640Z
Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters

Smallest 2mm x 2.1mm SC70 Package, the Industry's Smallest Total Solution Size, and Most Robust 4MHz/2MHz Step-Down DC-DC Converters on the Market that Can Deliver 500mA with Over 93% Efficiency


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 460kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail
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.

An evaluation kit is available:  MAX8640EVKIT  

Key Features   Applications/Uses
  • 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

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

    Diagram
    MAX8640Y, MAX8640Z: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-3997; Rev 4; 2009-03-16
    This page last modified: 2009-03-16


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