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Key Specifications
Part Number Description Status SubFamily Regulated Outputs(.) Vin(Min)(V) Vin(Max)(V) Vout(Min)(V) Vout(Max)(V) Iout(Max)(A) Topology Special Features Frequency(kHz) Operating Temperature Range (°C) Pin/Package EV Kit Available?
UM1665S Low Power DC/DC Boost Converter ACTIVE Step-Up (Boost) Converter 1 2 6 0 28 0 Boost Enable, Internal Soft-Start, Under Voltage Lockout 1000 -40 to 85 5/SOT23 Y
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Product Description
The UM1665 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 UM1665 has an internal 400mA 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.
The UM1665 is available in SOT23-5 and TDFN6 3.0×3.0 with only 0.60mm (TYP) thickness packages. The UM1665 is appropriate to be applied in small electronic equipments and wearable devices. 
- 2.0V to 6.0V Input Voltage Range
- Adjustable Output Voltage up to 28V
- 400mA 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 Thin DFN6 3.0×3.0 with 0.60mm (TYP) Thickness Packages
Typical Application Circuit

- LCD Bias Supply
- White LED Supply for LCD Backlights
- Digital Still Cameras
- PDAs, Organizers and Handheld PCs
- Cellular Phones
- Standard 3.3V/5V to 12V Conversion
Pin Configurations 

Ordering Information

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