austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com Datasheet AS1302 5V/30mA Adaptive Inductorless Boost Converter 1 General Description 2 Key Features Up to 90% Efficiency The AS1302 is a 30mA inductorless boost converter using a double H-bridge charge-pump topology with two 2.9V to 5.15V Input Voltage external flying capacitors. The AS1302 charge pump Regulated 5V Output features 1:2 and 2:3 operation modes as well as a 1:1 Automatic Mode Switching operation mode where the input is directly connected to the output. <1A Shutdown Current The AS1302 runs on a 1.2MHz fixed frequency and is Startup with Full Load (within 1ms) utilized with a low noise regulation scheme to allow Up to 30mA Load Current usage together with sensitive RF circuitry from the same Short Circuit Protection battery supply. Additionally to increase efficiency the AS1302 switches to 49kHz at light loads. Output Disconnected During Shutdown Designed to reside in portable and space limited Soft-Start equipment the 1.2MHz charge pump converts a 2.9V to No Inductor Required 5.15V input to regulated 5V output with 3% accuracy. Small External Components Required The shutdown function reduces the supply current to (COUT =2.2F, CFLY =220nF) <1A and disconnects the load from the output. The Low Noise Fixed Frequency (1.2MHz, 49kHz) integrated soft-start circuitry prevents high inrush Charge Pump: currents being drawn from the battery during start-up. - 1:1 Battery Feed Through Mode The AS1302 includes built-in under-voltage lockout, - 2:3 Single Phase Mode short circuit-, and thermal protection circuitry. - 1:2 Single Phase Mode The AS1302 is available in TDFN (3x3x0.8mm) 10-pin Package Options: and an extremely small 1.2x1.2mm WL-CSP 8-bumps package with 0.4mm pitch. - TDFN (3x3x0.8mm) 10-pin - WL-CSP 8-bumps with 0.4mm Pitch 3 Applications The device is ideal for two or three AA cells or a single Li-Ion battery cell to 5V conversion, mobile phones, portable instruments, microprocessor based systems and remote data-acquisition systems. Figure 1. AS1302 - Typical Application Diagram C FLY1 220nF C1+ C1- VOUT = 5V VBATT VBATT VOUT 2.9V to 5.15V C BAT C OUT 2.2F AS1302 2.2F On EN GND Off C2+ C2- 220nF C FLY2 www.austriamicrosystems.com/DC-DC Step-Up/AS1302 Revision 1.03 1 - 18 ams AG Technical content still valid