P P GOOD GND A EN GND SiC437, SiC438 www.vishay.com Vishay Siliconix 3 V to 28 V Input, 8 A, 12 A microBUCK DC/DC Converter FEATURES Versatile - Operation from 3 V to 28 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 DESCRIPTION - 1 % output voltage accuracy at -40 C to +125 C The SiC43x are synchronous buck regulators with Highly efficient integrated high side and low side power MOSFETs. Its - 97 % peak efficiency power stage is capable of supplying 12 A (SiC437) and 8 A - 1 A supply current at shutdown (SiC438) continuous current at up to 1 MHz switching frequency. This regulator produces an adjustable output - 50 A operating current not switching voltage down to 0.6 V from 3 V to 28 V input rail to Highly configurable accommodate a variety of applications, including - Four programmable switching frequencies available: computing, consumer electronics, telecom, and industrial. 300 kHz, 500 kHz, 750 kHz, and 1 MHz SiC437s and SiC438s architecture delivers ultrafast - Adjustable soft start and adjustable current limit transient response with minimum output capacitance and - Three modes of operation: forced continuous tight ripple regulation at very light load. The device is conduction, power save (SiC43xB, SiC43xD), or internally compensated and is stable with any capacitor. No ultrasonic (SiC43xA, SiC43xC) external ESR network is required for loop stability purposes. Robust and reliable The device also incorporates a power saving scheme that - Cycle-by-cycle current limit significantly increases light load efficiency. - Output overvoltage protection The regulator family integrates a full protection feature set, including output overvoltage protection (OVP), cycle by - Output undervoltage / short circuit protection with auto cycle overcurrent protection (OCP) short circuit protection retry (SCP) and thermal shutdown (OTP). It also has UVLO and a - Power good flag and over temperature protection user programmable soft start. Design tools The SiC437 and SiC438 are available in lead (Pb)-free power - Supported by Vishay PowerCAD Online Design enhanced MLP-44L package in 4 mm x 4 mm dimension. Simulation (www.vishay.com/power-ics/powercad-list/) - Design support kit (www.vishay.com/doc 74589) APPLICATIONS Material categorization: for definitions of compliance 5 V, 12 V, and 24 V input rail POLs please see www.vishay.com/doc 99912 Desktop, notebooks, server, and industrial computing Industrial and automation consumer electronics TYPICAL APPLICATION CIRCUIT AND PACKAGE OPTIONS Axis Title 100 10000 98 INPUT BOOT 96 3.0 V to 24 V DC DC C BOOT 94 V IN 1000 V = 5 V, L = 1.5 H OUT Phase V 92 OUT SiC43x V SW DD 90 V GL C DRV IN 88 MODE1 V V = 1.2 V, L = 0.56 H OUT OUT 100 86 MODE2 V FB R UP 84 R 82 DOWN C OUT 80 10 0123456789 101112 I - Output Current (A) OUT Fig. 1 - Typical Application Circuit Fig. 2 - Efficiency vs. Output Current (V = 12 V, f = 500 kHz, Power Saving Mode) IN sw S18-0864-Rev. C, 27-Aug-2018 Document Number: 75921 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 2nd line eff - Efficiency (%) 1st line 2nd line SiC437, SiC438 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 13 P P 13 P 3 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 - SiC43x 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 SiC437AED-T1-GE3 SiC437A Ultrasonic Internal SiC437BED-T1-GE3 SiC437B Power saving 12 A SiC437CED-T1-GE3 SiC437C Ultrasonic External SiC437DED-T1-GE3 SiC437D Power saving -40 C to +125 C PowerPAK MLP44-24L SiC438AED-T1-GE3 SiC438A Ultrasonic Internal SiC438BED-T1-GE3 SiC438B Power saving 8 A SiC438CED-T1-GE3 SiC438C Ultrasonic External SiC438DED-T1-GE3 SiC438D Power saving S18-0864-Rev. C, 27-Aug-2018 Document Number: 75921 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 IN SW 7 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