18-V boost regulator supports wide range of display sizes in mobile end products
Manufacturers of multiple portable end products with different display sizes can re-use their display power circuit design, saving development time and reducing board assembly and tooling costs.
By providing four variants with different peak coil current limits of 100 mA, 200 mA, 350 mA and 500 mA, ams has optimized the efficiency of the AS1345 across a wide range of loads. The AS1345’s output voltage can also be selected, with fixed-output versions available at 12 V, 15 V and 17 V, and adjustable versions enabling the designer to configure an output between 5 V and 18 V. All variants share the same footprint and pin-out.
System designers can therefore maintain a common power supply design across a range of displays by selecting the AS1345 variant with the most appropriate output voltage and peak coil current, and changing inductor and capacitor values appropriately. The AS1345 supports OLED displays ranging in size from 130 mm2 to 3700 mm2.
With a footprint of 2 mm x 2 mm, the AS1345 is ideal for display power circuits of end products, such as mobile phones and e-readers, that require long battery run-time and that impose severe board space constraints. Its high-frequency hysteretic control loop operates with very small external components. It also includes integrated MOSFETs for power and isolation switching.
This new step-up converter operates from an input voltage range of 2.9 V to 5.0 V, and so is suitable for use with a single lithium-ion battery, as well as with other battery types and configurations. It is capable of supplying a 20 mA output current at 18 V from a single Li-ion battery.
Supporting long battery run-time between charges, the device features a low quiescent current of 25 µA (typical). The device may be disconnected from the battery in shut-down mode.
Availability and Pricing
The AS1345 18 V step-up regulator is available for sampling now. The device is priced at $0.49 for 1,000 pieces.
An evaluation kit for the DC-DC Step-up Converter AS1345 is available online from ams.
More information about the AS1345 step-up DC-DC regulator at
www.ams.com/DC-DC-Converter/AS1345
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