High Efficiency www.ams.com/AS1345 AS1345 – 18V, High Efficiency, DC-DC Step-Up Converter We provide innovative analog solutions to - 90% Efficiency the most challenging applications in sensor and sensor interfaces, - Single Lithium Cell input range - Multiple Peak Inductor Current Selection - Adjustable and Preset Options - Battery disconnect in shutdown power management, and wireless. General Description The AS1345 high efficiency DC-DC step-up converter contains an internal Nchannel power switch and an internal P-channel battery isolation switch. The device operates from a 2.9V to 5.0V supply and can boost voltages up to 18V. A hysteretic control scheme is used to provide the highest operating efficiency over a wide range of input and output load conditions. The internal MOSFET switches reduce the external component count, and a high switching frequency supports the use of tiny surface mount components. Additional power-saving attributes include a very low quiescent current and a true shutdown mode. The AS1345 offers a variety of factory set inductor peak currents, allowing the user to optimise the converter for different display sizes. When a 500mA inductor current limit is selected, the AS1345 is capable of providing 18V @ 20mA output. Built-in safety features protect the IC from fault conditions. Applications Features - - Small and low current demand LCD panels Polymer LEDs (OLED) Cell phones PDAs Readers Mobile terminals 3D shutter glasses AS1345 Block Diagram 10uF 10uH to 22uH SWIN VDD = 2.9V to 5.0V SWOUT LX VDD 10uF 100k ON POK Input Voltage Range: 2.9V to 5.0V Adjustable Output Voltage Range: 5.0V to 18V Fixed Output Voltages: 12V, 15V and 17V Output Current up to 40mA Peak Coil Currents: 100, 200, 350 and 500 mA High speed hysteretic operating mode 90% Efficiency 18V @ 20mA from a single Li-Ion battery input True Shutdown 1.8V CMOS compatible Short Circuit and Thermal Protection Packages: • 8-pin (2x2mm) TDFN • 8-bumps (1.65x0.98 mm) WL-CSP with 0.4mm pitch AS1345 EN FB Vout = 5.0V to 18V 47pF GND OFF Device Peak Coil Current AS1345A 100 adjustable or fixed R2 mA 1uF to 10uF R3 Output AS1345B 200 adjustable or fixed AS1345C 350 adjustable or fixed AS1345D 500 adjustable or fixed www.ams.com [email protected] © 02/2013 by ams Subject to change without notice Headquarters ams AG Tobelbader Strasse 30, 8141 Unterpremstaetten, Austria Phone +43 3136 500-0 · Fax +43 3136 525-01 Sales Offices Worldwide [email protected] [email protected] [email protected]