Low-Power Battery-Backup Circuits in Small µDFN Packages

 

Part Number	Replacement	Explanation

Description

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The MAX16033–MAX16040 supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. The devices significantly improve system reliability and accuracy compared to other ICs or discrete components. The MAX16033–MAX16040 provide µP reset, backup-battery switchover, power-fail warning, watchdog, and chip-enable gating features.

The MAX16033–MAX16040 operate from supply voltages up to 5.5V. The factory-set reset threshold voltage ranges from 2.32V to 4.63V. The devices feature a manual-reset input (MAX16033/MAX16037), a watchdog timer input (MAX16034/MAX16038), a battery-on output (MAX16035/MAX16039), an auxiliary adjustable reset input (MAX16036/MAX16040), and chip-enable gating (MAX16033–MAX16036). Each device includes a power-fail comparator and offers an active-low push-pull reset or an active-low open-drain reset.

The MAX16033–MAX16040 are available in 2mm x 2mm, 8-pin or 10-pin µDFN packages and are fully specified from -40°C to +85°C.

MAX16033, MAX16034, MAX16035, MAX16036, MAX16037, MAX16038, MAX16039, MAX16040: Typical Operating Circuit Enlarge+

Key Features

• Low 1.2V Operating Supply Voltage
• Precision Monitoring of 5.0V, 3.3V, 3.0V, and 2.5V Power-Supply Voltages
• Independent Power-Fail Comparator
• Debounced Manual-Reset Input
• Watchdog Timer, 1.6s Timeout
• Battery-On Output Indicator
• Auxiliary User-Adjustable RESETIN
• Low 13µA Quiescent Supply Current
• Two Available Output Structures:
  • Active-Low Push-Pull Reset
  • Active-Low Open-Drain Reset
• Active-Low Reset Valid Down to 1.2V
• Power-Supply Transient Immunity
• 140ms (min) Reset Timeout Period
• Small 2mm x 2mm, 8-Pin and 10-Pin µDFN Packages

Applications/Uses

• Portable/Battery-Powered Equipment
• POS Equipment
• Critical µP/µC Power Monitoring
• Set-Top Boxes
• Controllers
• Computers
• Fax Machines
• Industrial Control
• Real-Time Clocks
• Intelligent Instruments