1 A inverting switching regulator

8 November 2000 Power Electronics / Power Management

Linear Technology's LT1931 is a 1,2 MHz fixed frequency, inverting DC-DC converter in a SOT-23 package. The LT1931 generates 350 mA at -5 V from a +5 V input, or it can also deliver -30 V from an input voltage as low as 2,6 V. The LTC1931's 1,2 MHz fixed frequency operation allows the use of tiny external components to minimise board space while producing a low-noise output free from the low frequency ripple typically present with charge-pump voltage converters. The SOT-23 package and the low switching noise make the LT1931 ideal for supplying low power bias voltages in noise-sensitive applications such as disk drives, cellular phones and digital cameras.

The LT1931 is pin-to-pin compatible with the LT1611. It operates from a 2,6 to 16 V supply and features an internal 1 A, 36 V switch. The high 1,2 MHz switching frequency enables the use of small, low cost capacitors and inductors, which minimise the total PCB footprint and allows for a profile of less than 2 mm in height. The LT1931's low 0,01 µA shutdown current virtually eliminates battery drain during shutdown, which extends operating time in portable devices.

The LT1931 is available in a 5-lead SOT-23 package.

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