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High-Efficiency Step-Up DC-DC Converters for 1V Inputs

We Recommend Improved Performance Device, MAX1678, for New Designs

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Built-In Synchronous Rectifier
  • 0.88V Guaranteed Start-Up
  • Ultra-Small µMAX Package: 1.1mm High
  • 83% Efficiency
  • 4µA Quiescent Supply Current into BATT Pin
  • 2µA Logic-Controlled Shutdown (MAX1642)
  • Two Undervoltage Detectors (MAX1643)
  • 2V to 5.2V Output Range
  • 20mA Output Current at 1.2V Input
  • Reverse Battery Protection

Applications/Uses

  • Pagers
  • Personal Medical Monitors
  • Pointing Devices
  • Remote Controls
  • Single-Cell Battery-Powered Devices

Description

The MAX1642/MAX1643 are high-efficiency, low-voltage, step-up DC-DC converters intended for devices powered by a single alkaline cell. They feature low quiescent supply currents and are supplied in the ultra-small µMAX® package, which is only 1.1mm high. The guaranteed start-up voltage is 0.88V.

Each device consists of an internal 1Ω, N-channel MOSFET power switch; a built-in synchronous rectifier that acts as the catch diode; an oscillator; a reference; and pulse-frequency-modulation (PFM) control circuitry. Both devices feature an independent undervoltage comparator (PFI/PFO). The MAX1642 also includes a 2µA logic-controlled shutdown mode. The MAX1643 offers a dedicated low-battery detector (BATTLO) in lieu of shutdown.

The output voltage for each device is preset to 3.3V ±4%, or can be adjusted from +2V to +5.2V using only two resistors.

Simplified Block Diagram

MAX1642, MAX1643: Typical Operating Circuit MAX1642, MAX1643: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .