MAX8640Y

PRODUCTION

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

Data Sheet (Rev. 6) Product Selection Table
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Overview

  • 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

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.

Applications

  • Cell Phones, PDAs, DSCs, MP3s
  • I/O Power
  • Microprocessor/DSP Core Power
  • Other Handhelds Where Space Is Limited
MAX8640Y
Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters
MAX8640Y, MAX8640Z: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Switching Regulators & Controllers 3
MAX1921
PRODUCTION Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23
MAX1920
PRODUCTION Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23
MAX8560
PRODUCTION 4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN
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Evaluation Kits

MAX8640EVKIT

MAX8640 Evaluation Kit

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Features and Benefits

  • Tiny 6-Pin SC70 IC Package
  • 500mA Guaranteed Output Current
  • Tiny External Components: (1µH/2.2µF or 2.2µH/4.7µF)
  • 24µA Quiescent Current
  • ±1% Initial Accuracy
  • Ultra-Fast Line and Load Transient Response
  • Low Output Ripple at All Loads
  • Fully Assembled and Tested

Product Details

The MAX8640 evaluation kit (EV kit) is a fully assembled and tested circuit for evaluating the MAX8640 step-down DC-DC converter. The MAX8640 EV kit operates from a 2.7V to 4.9V supply and provides a 500mA output. The 1.8V/2MHz version of the MAX8640 comes installed in the EV kit, but the same board can be used to evaluate the other versions. The MAX8640 is available with factory preset output voltages ranging from 0.8V to 2.5V.

Applications

  • Cell Phones, PDAs, DSCs, MP3s
  • I/O Power
  • Microprocessor/DSP Core Power
  • Other Handhelds Where Space Is Limited
MAX8640EVKIT
MAX8640 Evaluation Kit

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