The AS1323 from austriamicrosystems is a high efficiency step-up DC-DC converter which draws ultra-low current in quiescent mode. It delivers 100 mA output current from a single AA battery with possible fixed output voltages of 2,7 V, 3,0 V and 3,3 V, operating from an input voltage between 0,75 V and 2 V. The device offers an integrated unique low-voltage boost circuit which ensures startup even with high load currents. The minimum start-up voltage of 0,95 V is independent of the load current. The device draws quiescent current of only 1,6 μA and less than 200 nA in shutdown mode. Furthermore, during shutdown the battery is completely disconnected from the output. The device also features internal synchronous rectification which ensures high efficiency and eliminates the need for an external diode, and it has been designed to operate with physically small external components. The AS1323 is available in a 5-pin TSOT23 package suitable for the industrial temperature range of -40°C to +85°C.
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