MAX722

3.3V/5V Palmtop Computer and LCD Power-Supply Regulator

Battery or Wall Adapter Operated System Power Supply Powers Logic and LCD


Please check latest availability status for a specific part variant.

Description

The MAX722 and MAX723 CMOS power-supply ICs create dual regulated DC outputs for small, battery-operated microprocessor systems. Each device generates a main output (3V or 5V, selectable) and a negative auxiliary output that is adjustable for LCDs. Each device accepts two input voltages. Power can come from a main battery (two or three alkaline or NiCAD), or an unregulated DC source such as an AC-DC wall adapter.

The MAX722/MAX723 provide three improvements over prior-art devices. Physical size is reduced; the high switching frequencies (up to 0.5MHz), made possible by MOSFET power transistors, allow for tiny (< 5mm diameter) surface-mount magnetics. Efficiency is also improved to 87% (10% better than with low-voltage regulators made in bipolar technology). And supply current is reduced to 60µA by CMOS construction and a unique constant-off-time pulse-frequency modulation (PFM) control scheme.

The MAX722 and MAX723 differ only in the lower fixed output voltage of the main regulator, with a 3.3V output for the MAX722 and a 3.0V output for the MAX723.

For flash memory or PCMCIA applications that require a +12V output voltage, refer to the MAX717–721 data sheet.

Key Features

  • Low 0.9V to 5.5V Battery Input Range
  • Unregulated 7V to 20V DC Input Range
  • Dual Regulated Outputs
    • Main Output: 3.3V/5V
    • Auxiliary Output: 0V to -100V
  • 87% Efficiency at 200mA
  • Efficient PRAM Keep-Alive: 80% at 1mA
  • 8W/in³ Power Density
  • 60µA Quiescent Current
  • 20µA Shutdown Mode with VREF Alive
  • 500kHz Maximum Switching Frequency
  • ±1.5% VREF Tolerance (Over Temp.)
  • Detect Output Power Failures
  • 16-Pin Narrow SO Packages

Applications/Uses

  • Bar-Code Scanners
  • LCD Contrast Control
  • Medical Instrumentation
  • Palmtop Computers
  • Portable Data Communicators
  • Portable Data-Collection Equipment

MAX722: 3.3V/5V Palmtop Computer and LCD Power-Supply Regulator
MAX723: 3.3V/5V Palmtop Computer and LCD Power-Supply Regulator

Quality and Environmental Data

Request Reliability Report for: MAX722 
Lead-Free Package Tin (Sn) Whisker Reports
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.

Quality Management System >
Environmental Management System >

 
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