P P GOOD GND A EN GND SiC431 www.vishay.com Vishay Siliconix 3 V to 24 V Input, 24 A microBUCK DC/DC Converter FEATURES Versatile - Operation from 3 V to 24 V input voltage - Adjustable output voltage down to 0.6 V - Scalable solution 8 A (SiC438), 12 A (SiC437), and 24 A (SiC431) - Output voltage tracking and sequencing with pre-bias start up - 1 % output voltage accuracy from -40 C to +125 C DESCRIPTION Highly efficient The SiC431 is a synchronous buck regulator with integrated - 97 % peak efficiency high side and low side power MOSFETs. Its power stage is capable of supplying 24 A continuous current at up to - 1 A supply current at shutdown 1 MHz switching frequency. This regulator produces an - 50 A operating current, not switching adjustable output voltage down to 0.6 V from 3 V to 24 V Highly configurable input rail to accommodate a variety of applications, including computing, consumer electronics, telecom, and - Four programmable switching frequencies available: industrial. 300 kHz, 500 kHz, 750 kHz, and 1 MHz SiC431s architecture supports ultrafast transient response - Adjustable soft start and adjustable current limit with minimum output capacitance and tight ripple regulation - Three modes of operation: forced continuous at very light load. The device is internally compensated and conduction, power save (SiC431B, SiC431D), or no external ESR network is required for loop stability ultrasonic (SiC431A, SiC431C) purposes. The device also incorporates a power saving scheme that significantly increases light load efficiency. Robust and reliable The regulator integrates a full protection feature set, - Cycle-by-cycle current limit including output over voltage protection (OVP), cycle by - Output overvoltage protection cycle over current protection (OCP) short circuit protection - Output undervoltage / short circuit protection with auto (SCP) and thermal shutdown (OTP). It also has UVLO and a retry user programmable soft start. - Power good flag and over temperature protection The SiC431 is available in lead (Pb)-free power enhanced Design tools MLP44-24L package in 4 mm x 4 mm dimension. - Supported by Vishay PowerCAD Online Design APPLICATIONS Simulation (www.vishay.com/power-ics/powercad-list/) - Design Support Kit (www.vishay.com/ppg 74589) 5 V, 12 V, and 24 V input rail POLs Desktop, notebooks, server, and industrial computing Material categorization: for definitions of compliance Industrial and automation please see www.vishay.com/doc 99912 consumer electronics TYPICAL APPLICATION CIRCUIT AND PACKAGE OPTIONS 100 V = 5 V, L = 1 H OUT V = 3.3 V, L = 1 H OUT 97 INPUT BOOT 94 3.0 V to 24 V DC DC C BOOT V IN 91 Phase V OUT 88 SiC431 V SW DD V = 1.2 V, L = 0.36 H OUT V GL C DRV 85 IN MODE1 V OUT 82 MODE2 V FB R Complete converter efficiency UP P = V x I 79 IN IN IN P = V x I , measured at output capacitor R OUT OUT OUT DOWN C OUT 76 0 2 4 6 8 101214161820 Output Current, I (A) OUT Fig. 1 - Typical Application Circuit for SiC431 Fig. 2 - Efficiency vs. Output Current (V = 12 V, f = 500 kHz, Full Load) IN sw S18-0866-Rev. D, 27-Aug-2018 Document Number: 74589 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 91000 Efficiency (%)SiC431 www.vishay.com Vishay Siliconix PIN CONFIGURATION Pin 1 indicator 17 FB FB 17 25 26 16 A A 16 V 1 1 V GND GND IN IN A V GND IN V 2 15 V V 15 2 V IN DD DD IN 14 P P 14 GOOD GOOD P 3 13 P P 13 27 3 P GND GND GND GND P GND 12 V V 12 P 4 4 P DRV DRV GND GND 11 GL GL 11 28 GL Fig. 3 - SiC431 Pin Configuration PIN DESCRIPTION PIN NUMBER SYMBOL DESCRIPTION 1, 2, 22, 26 V Input voltage IN 3, 4, 13, 27 P Power signal return ground GND 5 to 9 SW Switching node signal output inductor connection point 10, 11, 28 GL Low side power MOSFET gate signal 12 V Supply voltage for internal gate driver. Connect a 2.2 F decoupling capacitor to P DRV GND 14 P Power good signal output open drain GOOD 15 V Supply voltage for internal logic. Connect a 1 F decoupling capacitor to A DD GND 16, 25 A Analog signal return ground GND 17 FB Output voltage feedback pin connect to V through a resistor divider network. OUT 18 V Output voltage sense pin OUT 19 EN Enable pin 20 MODE2 Soft start and current limit selection connect a resistor to V or A per Table 2 DD GND 21 MODE1 Operating mode and switching frequency selection connect a resistor to V or A per Table 1 DD GND 23 BOOT Bootstrap pin connect a capacitor to PHASE pin for HS power MOSFET gate voltage supply 24 PHASE Switching node signal for bootstrap return path ORDERING INFORMATION OPERATING PART MAXIMUM LIGHT LOAD PART NUMBER V , V JUNCTION PACKAGE DD DRV MARKING CURRENT MODE TEMPERATURE SiC431AED-T1-GE3 SiC431A Ultrasonic Internal SiC431BED-T1-GE3 SiC431B Power saving 24 A -40 C to +125 C PowerPAK MLP44-24L SiC431CED-T1-GE3 SiC431C Ultrasonic External SiC431DED-T1-GE3 SiC431D Power saving S18-0866-Rev. D, 27-Aug-2018 Document Number: 74589 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 24 PHASE SW 5 23 BOOT SW 6 22 V SW 7 IN SW 8 21 MODE1 SW 9 20 MODE2 GL 10 19 EN 18 V OUT 18 V OUT GL 10 19 EN SW 9 20 MODE2 SW 8 21 MODE1 SW 7 22 V IN SW 6 23 BOOT SW 5 24 PHASE