DESCRIPTION
The AIC1638 is a high efficiency step-up DC/DC converter for applications using 1 to 4 NiMH battery cells. Only three external components are required to deliver a fixed output voltage of 2.7V, 3.0V, 3.3V, or 5V. The AIC1638 starts up from below 0.9V input with 1mA load. Pulse Frequency Modulation scheme brings optimized performance for applications with ight output loading and low input voltages. The output ipple and noise are lower compared with the circuits operating in PSM mode.

FEATURES
• Guaranteed Start-Up from below 0.9 V.
• High Efficiency.
• Low Quiescent Current.
• Few Number of External Components needed.
• Low Ripple and Low Noise.
• Fixed Output Voltage: 2.7V, 3.0V, 3.3V, and 5V.
• Space Saving SOT-89 and TO-92 Packages.

APPLICATIONS
• Pagers.
• Cameras.
• Wireless Microphones.
• Pocket Organizers.
• Battery Backup Suppliers.
• Portable Instruments.