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AIC1639

1-Cell, 3-Pin, Step-Up DC/DC Controller

FEATURES
  • A Guaranteed Start-Up from less than 0.9 V.
  • High Efficiency.
  • Low Quiescent Current.
  • Less Number of External Components needed.
  • Low Ripple and Low Noise.
  • Fixed Output Voltage: 2.7, 3.0V, 3.3V, and 5V.
  • Driver for External Transistor.
  • Space Saving package: SOT23-3, SOT89-3 and TO92-3.
APPLICATIONS
  • Pagers.
  • Cameras.
  • Wireless Microphones.
  • Pocket Organizers.
  • Battery Backup Suppliers.
  • Portable Instruments.
DESCRIPTION
The AIC1639 is a high efficiency step-up DC/DC controller for applications using 1 to 4 battery cells. Only three external components are required to deliver a fixed output voltage of 2.7, 3.0V, 3.3V, or 5V. The AIC1639 starts up from less than 0.9V input with 1mA load. Pulse Frequency Modulation scheme brings opti-mized performance for applications with light output loading and low input voltages. The out-put ripple and noise are lower compared with the circuits operating in PSM mode.
The PFM control circuit operating in 100KHz (max.) switching rate results in smaller passive components. The space saving SOT23-3, SOT89-3 and TO92-3 packages make the AIC1639 an ideal choice of DC/DC controller for space conscious applications, like pagers, electronic cameras, and wireless microphones.
Provided with an external transistor driver pin (EXT), the AIC1639 is recommended for appli-cations requiring current as large as several tens to several hundreds of milli-amperes.
TYPICAL APPLICATION


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