MAX1817:Compact, High-Efficiency, Dual-Output, Step-Up DC-DC Converter

The MAX1817 is a compact, high-efficiency, dual-output step-up converter for portable devices that provides both the main logic supply and the LCD bias. The device operates from an input voltage of +1.5V to +5.5V, allowing the use of 2- or 3-cell alkaline batteries, or 1-cell lithium-ion (Li+) batteries. The MAX1817's main regulator supplies 125mA at either a preset 3.3V or an adjustable 2.5V to 5.5V output voltage with up to 88% efficiency. A 0.1µA shutdown state also minimizes battery drain. The MAX1817's secondary step-up converter provides the LCD bias voltage and is adjustable up to +28V. Other features include a fast switching frequency to reduce the size of external components and a low quiescent current to maximize battery life. Both outputs can be independently shut down for improved flexibility. The MAX1817 is supplied in a compact 10-pin µMAX package. The MAX1817 evaluation kit (MAX1817EVKIT) is available to speed up design.

Key Features
  • Dual Step-Up Converter in a Tiny 10-Pin µMAX Package
  • Main Output
    • Up to 125mA Load Current
    • Fixed 3.3V or Adjustable 2.5V to 5.5V
    • Up to 88% Efficiency
    • Internal Switch
  • LCD Output
    • Up to 28V for LCD Bias
    • Internal Switch
  • Input Voltage Range +1.5V to +5.5V
  • Minimal External Components Required
  • 0.1µA Logic-Controlled Shutdown
  • Low 15µA Quiescent Supply Current
MAX1817: Typical Operating Circuit
MAX1817: Typical Operating Circuit
  • GPS Receivers
  • MP3 Players
  • Organizers/Translators
  • PDAs
titleDownload file
MAX1817 Data SheetMAX1817.pdf
Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesLCD/LED/Flash/CCD FeaturesVIN
Oper. Freq.
minmaxminmaxSee Notes
MAX1817Step-UpShutdownCurrent Limit
Internal Switch
TFT Bias1.55.52.5280.1250.125500µMAX/10$1.93 @1k
Design kits & evaluation modules
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1817EUBNo Longer AvailableMAX1817EUB+µMAX,;10 pin;15.4 mm²-40°C to +85°CNo
MAX1817EUB+ActiveµMAX,;10 pin;15.4 mm²-40°C to +85°CLead Free
MAX1817EUB+TActiveµMAX,;10 pin;15.4 mm²-40°C to +85°CLead Free
MAX1817EUB-TNo Longer AvailableMAX1817EUB+TµMAX,;10 pin;15.4 mm²-40°C to +85°CNo
MAX1817.pdf MAX1817
典型工作电路 MAX1817