9_V_INPUT±5_V_OUTPUT_DC_TO_DC_CONVERTER

Published:2009/7/13 2:31:00 Author:May | From:SeekIC

Many dc-to-dc converter applications require regulated complementary output voltages from a single loosely regulated source. A common use for this is supplying 5 V and -5V to a video op amp for amplification or cable driving. Accomplishing this task in a space-effective manner with a minimum of corrtponents is a challenge for a designer. The LT1176-5 circuit shown here uses a single integrated switching regulator and an off-the-shelf inductor with an extra winding to generate ±5 V from an 8- to 12-V input. The circuit is designed to supply 5 V as the main output with up to 800 mA of load current, and -5 V as a secondary output with up to 100 mA load current. Regulation is adequate for most opamp circuits: 5-V regulation will be ±3 percent and -5-V regulation is about ±10 percent for loads between -10 and -100 mA. The LT1176-5 providesacomplete 100-kHz switching regulator with a 1.2-A on-chip switch in a thin 20-lead SO package. The enhanced thermal characteristics of the fused-lead SO package allow higher power outputs than were previously possible with SOs.



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