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austriamicrosystems introduce an ultra low IQ hysteretic step-up DC-DC converter AS1312

The AS1312 is an ultra low IQ hysteretic step-up DC-DC converter. The AS1312 achieves an efficiency of up to 94% and is designed to operate from a +0.7V to +5.0V supply, the output voltage is fixed in 50mV steps from +2.5V to 5.0V. In order to save power the AS1312 features a shutdown mode, where it draws less than 100nA. In shutdown mode the battery is not connected to the output. If the input voltage exceeds the output voltage the device is in a feedthrough mode and the input is directly connected to the output voltage.

In light load operation, the device enters a sleep mode when most of the internal operating blocks are turned off in order to save power. This mode is active approximately 50μs after a current pulse provided that the output is in regulation. The AS1312 also offers an adjustable low battery detection. If the battery voltage decreases below a threshold defined by two external resistors on pin LBI, the LBO output is pulled to logic low. LBO is working as Power-OK when LBI is connected to GND. The AS1312 is available in a 8-pin (2×2) TDFN and a 0.4mm pitch 8-pin WL-CSP package.

Key Features:

  • Input 0.7V to 5.5V with 1uA quiescent
  • 60mA @ 1.8V to 3.3V
  • 92% efficiency


The AS1312 is an ideal solution for handheld devices and battery powered products.