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Key Specifications
Product Description
The UM1666 is a PFM controlled step-up DC-DC converter with a switching frequency up to 1MHz. The device is ideal to generate output voltage for small to medium LCD bias supplies and white LED backlight supplies from a single cell Li-Ion battery. The part can also be used to generate standard 3.3V/5V to 12V power conversions.
With a high switching frequency of 1MHz, a low profile and small board area solution can be achieved using a chip coil and an ultra small ceramic output capacitor. The UM1666 has an internal 600mA switch current limit, offering lower output voltage ripple. The low quiescent current (typically 36µA) together with an optimized control scheme, allows device operation at very high efficiencies over the entire load current range.
Features
- 2.0V to 6.0V Input Voltage Range
- Adjustable Output Voltage up to 28V
- 600mA Internal Switch Current
- Up to 1MHz Switching Frequency
- 36µA Typical No Load Quiescent Current
- 1µA Maximum Shutdown Current - Internal Soft-Start
- Available in Tiny SOT23-5 and DFN6L 2.0×2.0 Packages
Typical Application Circuit
 Applications
- LCD Bias Supply
- White LED Supply for LCD Backlights
- Digital Still Camera
- PDAs, Organizers and Handheld PCs
- Cellular Phones
- Standard 3.3V/5V to 12V Conversion
Pin Configurations
Top view  UM1666DA
Ordering Information
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Application Notes
Product Selection Guide
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