High-Voltage, Low-Power Linear Regulators for Notebook Computers

High-Voltage, Low-Power Linear Regulators for Notebook Computers

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The MAX8718/MAX8719 are micropower, 8-pin TDFN linear regulators that supply always-on, keep-alive power to CMOS RAM, real-time clocks (RTC), and microcontrollers in systems with high-voltage batteries. The circuits consist of a 100mA linear regulator and a power-good comparator (PGOOD) with fixed-output delay. Key features include wide input voltage range, low-dropout voltage, and low-quiescent supply current.

Despite a miserly 25µA (max) no-load quiescent current, the MAX8718/MAX8719 have good line- and loadtransient response and excellent AC power-supply rejection. They provide a clean fixed 5V or 3.3V output (MAX8718), or an adjustable 1.24V to 28V output (MAX8719), even when subjected to fast supply-voltage changes that occur during the switchover from battery to AC-adapter input power. The space-saving TDFN package has excellent thermal characteristics and tolerates up to 1951mW of power dissipation. Internal foldback current limiting and thermal shutdown protect the regulator from overload and thermal faults.

In addition to the main notebook-computer application, these devices are useful in other low-power, high-voltage applications (4V < VIN < 28V) such as smart batteries, current control loops, telecom emergency power, and housekeeping power for off-line supplies.

The MAX8718/MAX8719 are available in a thermally enhanced 3mm x 3mm, 8-lead TDFN package.

MAX8718, MAX8719: Functional Diagram MAX8718, MAX8719: Functional Diagram Enlarge+

Key Features

  • 4V to 28V Input Range
  • 18µA Quiescent Supply Current
  • <3µA Shutdown Supply Current
  • 100mA Output Current
  • 3.3V or 5V, Pin-Selectable Output (MAX8718)
  • Adjustable 1.24V to 28V Output (MAX8719)
  • ±2% Output Accuracy
  • Thermal-Overload Protection
  • Delayed Power-Good Output
  • Thermally Enhanced 8-Pin TDFN Package
  • Applications/Uses

    • Battery-Powered Systems
    • CMOS/RTC Backup Power
    • Microcontroller Power
    • Notebook Computers
    • PDAs and Handy-Terminals
    • Smart Battery Packs/Chargers

    See parametric specs for Linear Regulators (134)

    Part NumberRegulatorsVIN
    Adj. VOUT
    Adj. VOUT
    Rated ILOAD
    Rated ILOAD
    Low Batt./ Pwr. Fail OutPOK/Reset Thresh.
    WatchdogReverse Batt. Protect.Oper. Temp.
    minmaxminmaxtypmaxnomSee Notes
    MAX8719 14281.24280.3510010018NoVout-10%NoNo-40 to +85
    $1.18 @1k

    Pricing Notes:
    This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Technical Documents

    User Guide 6207 MAXREFDES46# Quickstart Guide
    User Guide 5885 MAXREFDES32# ZedBoard Quick Start Guide
    User Guide 5866 MAXREFDES71# ZedBoard Quick Start Guide
    Product Reliability Reports: MAX8719.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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