SiC403A, SiC403BCD www.vishay.com Vishay Siliconix 6 A microBUCK SiC403A/B Integrated Buck Regulator with Programmable LDO FEATURES High efficiency > 93 % 6 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 SiC403A/B an advanced stand-alone Selectable ultra-sonic power-save mode (SiC403A) synchronous buck regulator featuring integrated power Selectable power-save mode (SiC403B) MOSFETs, bootstrap switch, and a programmable LDO in a Programmable soft-start space-saving PowerPAK MLP32-55G pin packages. 1 % internal reference voltage The SiC403A/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. please see www.vishay.com/doc 99912 Additional features include cycle-by-cycle current limit, voltage soft-start, under-voltage protection, programmable APPLICATIONS over-current protection, soft shutdown and selectable Notebook, desktop, and server computers power-save. The Vishay Siliconix SiC403A/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 28 V a Point of load power supplies Output voltage range 0.6 V to V x 0.75 IN Operating frequency 200 kHz to 1 MHz Continuous output current 6 A Peak efficiency 93 % Package PowerPAK MLP32-55G Note a. See High Output Voltage Operation section S20-0483-Rev. C, 29-Jun-2020 Document Number: 62768 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 91000SiC403A, SiC403BCD 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 VOUT LX FB 1 24 V OUT PAD 1 LX 2 23 V P DD GND AGND 22 3 A P GND GND PAD 3 4 21 P FBL GND LX 20 5 V IN PAD 2 V P IN GND 6 19 P SS V GND IN 7 18 BST PGND 17 8 Typical Application Circuit for SiC403A/B (PowerPAK MLP32-55G) FUNCTIONAL BLOCK DIAGRAM PGOOD EN/PSV VIN 26 29 A V IN VDD VDD Bootstrap Switch 8 BST AGND D Control & Status Reference VDD DL 12 NC Hi-side SS 7 Soft Start MOSFET B LX A = connected to pins 6, 9-11, PAD 2 Gate Drive On-- time B = connected to pins 23-25, PAD 3 1 Control FB Generator 13 LXBST VDD C = connected to pins 15-22 FB Comparator D = connect to pins 4, 30, PAD 1 28 LXS DL Lo-side 31 TON MOSFET Zero Cross Detector 2 C PGND VOUT Bypass ComparBypass Comparatatoror Valley Current Limit 27 ILIM VDD A VIN VDD 3 Y B LDO 14 NC VLDO Switchover MUX FBL 5 32 ENL SiC403A/B Functional Block Diagram PIN CONFIGURATION 32 31 30 29 28 27 26 25 FB 1 24 LX PAD 1 V OUT 2 23 LX V 3 A DD GND 22 P GND PAD 3 A 4 21 P GND GND FBL 5 LX 20 P GND PAD 2 V IN 6 19 P GND V SS IN P 7 18 GND P GND BST 8 17 SiC403A/B Pin Configuration (Top View) S20-0483-Rev. C, 29-Jun-2020 Document Number: 62768 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 ENL VIN 9 V ENL IN 9 V T IN ON V t IN 10 10 ON V A IN GND 11 V 11 A IN GND EN PSV NC 12 12 NC EN PSV LX LX 13 ILIM LX 13 LX NC 14 P P GND GOOD I NC 14 LIM 15 P GND LX 16 P GND 15 P GOOD LX P 16 GND