® PI37xx Series ZVS Buck-Boost Regulators General purpose and VTM compatible Buck-Boost regulators For use in Computing, Communications, Industrial, 48 VIN Bus Rail, 24 VIN Bus Rail, Battery Line Stabilization Description Features The PI37xx is a series of high efficiency, wide input range DC-DC ZVS-Buck-Boost regulators integrating controller, power switches, and support components all within a high density System-in-Package (SiP). The high switching frequency operation reduces the size of the external filtering components, improves power density, and enables very fast dynamic response to line and load transients, sustaining high switching frequency up to the rated input voltage without sacrificing efficiency while also supporting large conversion ratios. nOver 98% efficiency at >800 kHz FSW nFast transient response nParallel capable with single wire current sharing nExternal frequency synchronization/interleaving nHigh-Side current sense amplifier nGeneral purpose amplifier nInput over/under voltage lockout (OVLO/UVLO) nOutput overvoltage protection (OVP) nOver temperature protection (OTP) PI3749 Typical Application nFast and slow current limits n-40°C to 125°C operating range (TJ ) L1 Vin Vin Cin VS1 VS2 VOUT PGND PGND Vout Cout ISP PI3749 ISN IMON VDR PGD VSN EN VSP R1 VDIFF SYNCO EAIN SYNCI TRK EAO COMP SGND R2 Evaluation Boards for PI3749 available online. Part Numbering Cool-Power Input (V) Output (V) Power (W) Package 16 – 34 12 – 34 200 LGA SIP: 10 x 14 x 2.56 mm PI3751-00-LGIZ 38 – 60 38 – 50 200 LGA SIP: 10 x 14 x 2.56 mm PI3755-01-LGIZ 38 – 60 28 – 54 100 LGA SIP: 10 x 10 x 2.56 mm General Purpose Buck-Boost PI3749-00-LGIZ VTM Compatible PRM vicorpower.com Rev 1.1 4/2015 PI3751 Used within a 48 V to Processor VRx Solution Efficiency PI3751 Efficiency PI3749, 12 V Efficiency @ VOUT = 12 V vs. Output Current Efficiency @ VOUT = 44 V vs. Output Current 100 100% 98% Efficiency (%) Efficiency (%) 96% 94% 92% 90% 88% 86% 95 90 85 84% 82% 80 80% 0 1 3 2 6 5 4 7 0 8 1 2 3 Output Current (A) 38 VIN 54 VIN 5 16 VIN 60 VIN Efficiency PI3749, 24 V 6 7 8 9 10 11 24 VIN 34 VIN Efficiency PI3749, 28 V Efficiency @ VOUT = 24 V vs. Output Current Efficiency @ VOUT = 28 V vs. Output Current 100 100 95 95 Efficiency (%) Efficiency (%) 4 Output Current (A) 90 85 90 85 80 80 0 1 2 3 4 5 Output Current (A) 16 VIN 24 VIN 34 VIN 6 7 0 1 2 3 4 5 6 7 8 Output Current (A) 16 VIN vicorpower.com 24 VIN 34 VIN Rev 1.1 4/2015