Datasheet SiC476, SiC477, SiC478, SiC479 (Vishay)

SiC476, SiC477, SiC478, SiC479
www.vishay.com Vishay Siliconix
4.5 V to 55 V Input, 3 A, 5 A, 8 A, 12 A microBUCK® DC/DC Converter FEATURES
• Versatile - Single supply operation from 4.5 V to 55 V input voltage - Adjustable output voltage down to 0.8 V - Scalable solution 3 A (SiC479), 5 A (SiC478), 8 A (SiC477), 12 A (SiC476) - Output voltage tracking and sequencing with pre-bias start up - ± 1 % output voltage accuracy at -40 °C to +125 °C • Internal compensation • Highly efficient - 98 % peak efficiency - 4 μA supply current at shutdown - 156 μA operating current not switching • Highly configurable - Adjustable switching frequency from 100 kHz to 2 MHz - Adjustable soft start and selectable preset 100 %, 75 %,
DESCRIPTION
and 50 % current limit - 2 modes of operation, forced continuous conduction or The SiC47x is a family of wide input voltage high efficiency power save mode synchronous buck regulators with integrated high side and • Robust and reliable low side power MOSFETs. Its power stage is capable of - Output over voltage protection - Output under voltage / short circuit protection with auto supplying high continuous current at up to 2 MHz switching retry frequency. This regulator produces an adjustable output - Power good flag and over temperature protection voltage down to 0.8 V from 4.5 V to 55 V input rail - Supported by Vishay PowerCAD online design simulation to accommodate a variety of applications, including • Design support tools computing, consumer electronics, telecom, and industrial. - PowerCAD online design simulation (vishay.transim.com) SiC47x’s architecture delivers ultrafast transient response - External component calculator (www.vishay.com/doc?75760) with minimum output capacitance and tight ripple regulation - Schematic, design, BOM, and gerber files (www.vishay.com/doc?75763) at very light load. The device is internally compensated and • Material categorization: for definitions of compliance is stable with any capacitor. No external ESR network is please see www.vishay.com/doc?99912 required for loop stability purpose. The device also
APPLICATIONS
incorporates a power saving scheme that significantly • Industrial and automation increases light load efficiency. The regulator integrates a full • Home automation protection feature set, including over current protection • Industrial and server computing (OCP), output overvoltage protection (OVP), short circuit • Networking, telecom, and base station power supplies protection (SCP), output undervoltage protection (UVP) and • Wall transformer regulation • Robotics thermal shutdown (OTP). It also has UVLO for input rail and • High end hobby electronics: remote control cars, planes, a user programmable soft start. and drones • Battery management systems The SiC47x family is available in 3 A, 5 A, 8 A, 12 A pin • Power tools compatible 5 mm by 5 mm lead (Pb)-free power enhanced • Vending, ATM, and slot machines MLP55-27L package. Axis Title 100 10000
TYPICAL APPLICATION CIRCUIT
V = 24 V, V = 12 V IN OUT 98 96 EN P BOOT C G Input BOOT OOD ) 94 VCIN 1000 Phase V 4.5 V OUT DC to 60 VDC (% 92 V SW IN SiC476 V = 48 V, V = 12 V IN OUT ne ne V SiC477 ine DD C iency 90 IN SiC478 V c V OUT DRV SiC479 V = 24 V, V = 5 V R ffi IN OUT 1st li 2nd l 2nd li SS NC up E 88 V I FB C 100 LIMIT OUT eff - 86 MODE A P NC R G G C f down ss S ND ND W 84 V = 48 V, V = 5 V R IN OUT MODE 82 Rfsw 80 10 0 1 2 3 4 5 6 7 8
Fig. 1 - Typical Application Circuit
I - Output Current (A) OUT
Fig. 2 - SiC477 Efficiency vs. Output Current
S19-0910-Rev. C, 28-Oct-2019
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Document Number: 77113 For technical questions, contact: powerictechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000