BOOT PGND P A GOOD GND EN fSW SiC471, SiC472, SiC473, SiC474 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 (SiC474), 5 A (SiC473), 8 A (SiC472), 12 A (SiC471) - Output voltage tracking and sequencing with pre-bia s LINKS TO ADDITIONAL RESOURCES start up - 1 % output voltage accuracy at -40 C to +125 C Highly efficient Design Tool Evaluation Design Tools Boards - 98 % peak efficiency - 4 A supply current at shutdown DESCRIPTION - 235 A operating current, not switching The SiC47x is a family of wide input voltage, high efficiency Highly configurable synchronous buck regulators with integrated high side - Adjustable switching frequency from 100 kHz to 2 MHz and low side power MOSFETs. Its power stage is capable - Adjustable soft start and adjustable current limit of supplying high continuous current at up to 2 MHz - 3 modes of operation, forced continuous conduction, switching frequency. This regulator produces an adjustable power save or ultrasonic output voltage down to 0.8 V from 4.5 V to 55 V input Robust and reliable rail to accommodate a variety of applications, including - Output over voltage protection computing, consumer electronics, telecom, and industrial. - Output under voltage / short circuit protection with auto retry SiC47xs architecture allows for ultrafast transient response - Power good flag and over temperature protection with minimum output capacitance and tight ripple regulation - Supported by Vishay PowerCAD online design at very light load. The device enables loop stability simulation regardless of the type of output capacitor used, including Material categorization: for definitions of compliance please see www.vishay.com/doc 99912 low ESR ceramic capacitors. The device also incorporates a power saving scheme that significantly increases light load APPLICATIONS efficiency. The regulator integrates a full protection featur e Industrial and automation set, including over current protection (OCP), output Home automation overvoltage protection (OVP), short circuit protection (SCP), Industrial and server computing output undervoltage protection (UVP) and over temperatur e Networking, telecom, and base station power supplies protection (OTP). It also has UVLO for input rail and a user Unregulated wall transformer programmable soft start. Robotics High end hobby electronics: remote control cars, planes, The SiC47x family is available in 3 A, 5 A, 8 A, 12 A pin and drones compatible 5 mm by 5 mm lead (Pb)-free power enhanced Battery management systems MLP55-27L package. Power tools Vending, ATM, and slot machines TYPICAL APPLICATION CIRCUIT Axis Title 100 10000 V = 24 V, V = 12 V IN OUT 98 C BOOT INPUT V 96 CIN 4.5 VDC to 55 VDC PHASE V OUT V SW IN 94 1000 VDD C Rx Cx 92 IN SiC47x V VDRV SNS V = 48 V, V = 12 V Cy IN OUT ULTRASONIC R MODE up 90 SS VFB C OUT V = 24 V, V = 5 V IN OUT 88 I LIMIT COMP R down C R ss comp 100 86 R limit C comp 84 R fsw V = 48 V, V = 5 V IN OUT 82 80 10 012345678 I - Output Current (A) OUT Fig. 1 - Typical Application Circuit for SiC47x Fig. 2 - SiC472 Efficiency vs. Output Current S21-0217-Rev. F, 08-Mar-2021 Document Number: 75786 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 lineSiC471, SiC472, SiC473, SiC474 www.vishay.com Vishay Siliconix PIN CONFIGURATION 1 V V 1 CIN CIN 19 SS SS 19 28 A 18 ULTRASONIC ULTRASONIC 18 GND 28 AGND 2 P P 2 GOOD GOOD 17 P P 17 GND GND EN 3 3 EN 16 V V 16 DRV DRV 4 BOOT BOOT 4 15 GL GL 15 29 30 SW 14 14 SW V IN VIN PHASE 5 29 PGND 30 P 5 PHASE GND SW 13 13 SW PHASE 6 6 PHASE SW 12 12 SW Fig. 3 - SiC47x Pin Configuration PIN DESCRIPTION PIN NUMBER SYMBOL DESCRIPTION Supply voltage for internal regulators V and V . This pin should be tied to V , but can also be DD DRV IN 1V CIN connected to a lower supply voltage (> 5 V) to reduce losses in the internal linear regulators Open-drain power good indicator - high impedance indicates power is good. An external pull-up 2P GOOD resistor is required Enable pin. Tie high/low to enable/disable the IC accordingly. This is a high voltage compatible pin, 3EN can be tied to V IN 4 BOOT High side driver bootstrap voltage 5, 6 PHASE Return path of high side gate driver 7, 8, 29 V Power stage input voltage. Drain of high side MOSFET IN 9, 10, 11, 17, 30 P Power ground GND 12, 13, 14 SW Power stage switch node 15 GL Low side MOSFET gate signal Supply voltage for internal gate driver. When using the internal LDO as a bias power supply, V is DRV 16 V DRV the LDO output. Connect a 4.7 F decoupling capacitor to P GND Float to disable ultrasonic mode, connect to V to enable. Depending on the operation mode set by DD 18 ULTRASONIC the mode pin, power save mode or forced continuous mode will be enabled when the ultrasonic mode is disabled Set the soft start ramp by connecting a capacitor to A . An internal current source will charge the GND 19 SS capacitor 20 V Power inductor signal feedback pin for system stability compensation SNS Output of the internal error amplifier. The feedback loop compensation network is connected from 21 COMP this pin to the A pin GND Feedback input for switching regulator used to program the output voltage - connect to an external 22 V FB resistor divider from V to A OUT GND 23, 28 A Analog ground GND 24 f Set the on-time by connecting a resistor to A SW GND 25 I Set the current limit by connecting a resistor to A LIMIT GND 26 V Bias supply for the IC. V is an LDO output, connect a 1 F decoupling capacitor to A DD DD GND 27 MODE Set various operation modes by connecting a resistor to A . See specification table for details GND S21-0217-Rev. F, 08-Mar-2021 Document Number: 75786 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 27 MODE V 7 IN 26 V DD V 8 IN 25 I LIM 24 f SW P 9 23 A GND GND 22 V P 10 FB GND P 11 21 COMP GND 20 V SNS 20 V SNS P 11 21 COMP GND P 10 22 V GND FB P 9 23 A GND GND 24 f SW 25 I LIM V 8 IN 26 V DD V 7 IN 27 MODE