SiC401A, SiC401BCD www.vishay.com Vishay Siliconix 15 A microBUCK SiC401A/B Integrated Buck Regulator with Programmable LDO FEATURES High efficiency > 93 % 15 A continuous output current capability Integrated bootstrap switch Programmable 200 mA LDO with bypass logic Temperature compensated current limit All ceramic solution enabled Pseudo fixed-frequency adaptive on-time control Programmable input UVLO threshold DESCRIPTION Independent enable pin for switcher and LDO The Vishay Siliconix SiC401A/B an advanced stand-alone Selectable ultra sonic power-save mode (SiC401A) synchronous buck regulator featuring integrated power Selectable power-save mode (SiC401B) MOSFETs, bootstrap switch, and a programmable LDO in a Programmable soft-start and soft-shutdown space-saving PowerPAK MLP32-55G pin package. 1 % internal reference voltage The SiC401A/B is capable of operating with all ceramic Power good output solutions and switching frequencies up to 1 MHz. The programmable frequency, synchronous operation and Over voltage and under voltage protections selectable power-save allow operation at high efficiency PowerCAD Simulation software available at across the full range of load current. The internal LDO may www.vishay.com/power-ics/powercad-list/ be used to supply 5 V for the gate drive circuits or it may be Material categorization: for definitions of compliance bypassed with an external 5 V for optimum efficiency and please see www.vishay.com/doc 99912 used to drive external n-channel MOSFETs or other loads. Additional features include cycle-by-cycle current limit, APPLICATIONS voltage soft-start, under voltage protection, programmable Notebook, desktop and server computers over current protection, soft shutdown and selectable power-save. The Vishay Siliconix SiC401A/B also provides Digital HDTV and digital consumer applications an enable input and a power good output. Networking and telecommunication equipment Printers, DSL, and STB applications PRIMARY CHARACTERISTICS Embedded applications Input voltage range 3 V to 17 V a Output voltage range 0.6 V to V x 0.75 Point of load power supplies IN Operating frequency 200 kHz to 1 MHz Continuous output current 15 A Peak efficiency 93 % Package PowerPAK MLP32-55G Note a. See High Output Voltage Operation section S20-0483-Rev. E, 29-Jun-2020 Document Number: 63835 1 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 91000SiC401A, SiC401BCD www.vishay.com Vishay Siliconix TYPICAL APPLICATION CIRCUIT AND PACKAGE OPTIONS EN/PSV (Tri-State) P GOOD LDO EN VOUT 32 31 30 29 28 27 26 25 V OUT FB LX 1 24 V OUT PAD 1 LX 2 23 V P DD GND A 3 GND 22 A PGND GND PAD 3 4 21 P FBL GND 5 LX 20 V IN PAD 2 VIN P GND 6 19 P SS V GND IN 7 18 BST P GND 8 17 Typical Application Circuit for SiC401A/B (PowerPAK MLP32-55G) FUNCTIONAL BLOCK DIAGRAM VIN PGOOD EN/PSV 26 29 A V IN VDD VDD Bootstrap Switch 8 BST AGND D Control & Status Reference VDD DL 12 NC SS Hi-side 7 Soft Start MOSFET B LX Gate Drive On-- time FB 1 Control Generator 13 LXBST A = connected to pins 6, 9-11, PAD 2 VDD FB Comparator B = connected to pins 23-25, PAD 3 28 LXS C = connected to pins 15-22 D = connect to pins 4, 30, PAD 1 DL Lo-side TON 31 MOSFET Zero Cross Detector C PGND 2 VOUT Bypass ComparBypass Comparatatoror Valley Current Limit 27 ILIM VDD A V IN VDD 3 Y B LDO 14 NC VLDO Switchover MUX FBL 5 32 ENL SiC401A/B Functional Block Diagram PIN CONFIGURATION 32 31 30 29 28 27 26 25 1 LX FB 24 PAD 1 V OUT 2 23 LX V A DD 3 GND P 22 GND PAD 3 A GND 4 21 P GND FBL LX 5 20 P GND PAD 2 V 6 IN 19 PGND V IN SS 7 18 P GND P 8 17 GND BST SiC401A/B Pin Configuration (Top View) S20-0483-Rev. E, 29-Jun-2020 Document Number: 63835 2 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 VIN ENL ENL 9 VIN 9 V T IN ON 10 V t IN 10 A ON VIN GND 11 EN PSV V 11 A NC IN GND 12 LX LX 13 12 NC EN PSV ILIM NC 14 LX 13 LX P GND PGOOD 15 P GND LX I NC 14 LIM 16 P GND 15 P GOOD LX P 16 GND