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AIC1628

High-Efficiency, Step-Up DC/DC Controller

FEATURES
  • 4V to 20V Input Voltage Operation.
  • Adjustable Output Voltage.
  • Low Quiescent Current at 100mA.
  • Pulse-Skipping and Pulse-Frequency Modulation Maintain High Efficiency (max. 95%).
  • 90KHz to 250KHz Oscillator Frequency.
  • Power-Saving Shutdown Mode (8uA Typical).
  • Push-Pull Driver Output.
  • VREF Pin Available.
  • Current Limit Function Available.
APPLICATIONS
  • Flash Memory Programming Power Supply.
  • Positive LCD Contrast Bias for Notebook & Palmtop Computers.
  • Step-Up DC/DC Converter Module.
  • Telecom Power Supply.
DESCRIPTION

The AIC1628 is a high performance step-up DC/DC controller, designed to drive an external power switch to generate programmable posi-tive voltages. In the particularly suitable LCD contrast bias and flash memory programming power supply applications, typical full-load effi-ciencies are 85% to 95%. 4V to 20V input op-eration range allows the AIC1628 to be pow-ered directly by the battery pack in the most battery-operated applications for greater effi-ciency.
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 100uA and can be reduced to 8uA in shutdown mode. Switching frequency being around 90KHz to 250KHz range, small size switching components are ideal for battery powered port-able equipments, like notebook and palmtop computers.

TYPICAL APPLICATION


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