ADP3050 INVERTING (BUCK BOOST) REGULATOR

Question

Hi all, 
 "ADP3050 Buck Regulator Design Tool" can not design the ADP3050 in a buck-boost configuration that produces a negative output voltage from a positive input voltage. 
 In the datasheet 18 page, "INVERTING (BUCK BOOST) REGULATOR" The circuit in Figure 29 shows the ADP3050 in a buck-boost configuration. 
 For example, following output setting is available for ADP3050? VIN:+5.0V VOUT:-12.0V IOUT:0.5~1A ;need to set less current ? 
 Best regards, sss

MarkusHP · Accepted Answer

Hello, 
 when you follow the math on page 18 you will see that the available output current for a +5V to -12V application is less than 250mA, hence, for more output power you need a part with a bigger switch rating. Once you have to go away from the ADP3050 you should look for a more modern part with higher and maybe adjustable switching frequency. The ADP2380 should be an candidate. Look for Vin,min (4.5V) and the Absmax. There is a design tool for an inverting BuckBoost topology available for the ADP238X family.)

ADIApproved · Answer

Hi Sss, 
 You may also want to check LT3863 and LT3579. These products also fit your given specifications. 
 Best Regards, 
 Alex

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ADP3050 INVERTING (BUCK BOOST) REGULATOR