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AIC1650

High-Efficiency, Inverting DC/DC Controller

FEATURES
  • 4V to 20V Input Voltage Operation
  • Adjustable Output Voltage up to -40V.
  • Low Quiescent Current at 100uA.
  • Pulse Frequency Modulation Maintains High Efficiency (max. 90%).
  • 100KHz to 320KHz Switching Frequency.
  • Power-Saving Shutdown Mode (8uA Typical).
  • High Efficiency with Low Cost External PNP Bipolar Transistor.
APPLICATIONS
  • Negative LCD Contrast Bias for
  • 1. Notebook & Palmtop Computers.
  • 2. Pen-Based Data System.
  • 3. Portable Data Collection Terminals.
  • 4. Personal Digital Assistants.
  • Negative Voltage Supply.
DESCRIPTION
The AIC1650 is a high performance inverting DC/DC controller, designed to drive an external power switch to generate programmable nega-tive voltages. In the particularly suitable LCD bias contrast application, maximum efficiency of 90% can be achieved with low cost PNP bipolar transistor drivers. 4V to 20V input operation range allows the AIC1650 to be powered directly by the battery pack in most battery-operated applications for greater efficiency. Output voltage can be scaled to -40V or greater by two external resistors.
A pulse frequency modulation scheme is employed to maintain high efficiency conversion under wide input voltage range. Quiescent current is about 100mA and can be reduced to 8uA in shutdown mode. Switching frequency being around 100KHz to 320KHz range, small size switching components are ideal for battery powered port-able equipments, like notebook and palmtop computers.
TYPICAL APPLICATION


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