DC/DC boost converter has 1 µA quiescent current

November 28, 2013 // By Graham Prophet
AS1312, from ams, is an ultra-low-IQ hysteretic step-up DC-DC converter that achieves an efficiency of up to 94% and is designed to operate from a +0.7V to +5.0V supply, with an output voltage fixed in 50 mV steps from +2.5V to 5.0V.

Peak output current is 200mA; it features a shutdown mode, where it draws less than 100 nA and in which 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 50 μsec 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, the LBO output is pulled to logic low: LBO functions as a power-OK indication when LBI is connected to GND. The AS1312 is available in a 8-pin (2 x 2 mm) TDFN and a 0.4 mm pitch 8-pin WL-CSP package.

ams; www.ams.com