MIC28303 50V, 3A Power Module Features General Description Easy to Use MIC28303 is synchronous step-down regulator module, featuring a unique adaptive ON-time control - Stable with Low-Equivalent Series Resistance architecture. The module incorporates a DC/DC (ESR) Ceramic Output Capacitor controller, power MOSFETs, bootstrap diode, bootstrap - No Inductor and No Compensation to capacitor and an inductor in a single package. The Choose MIC28303 operates over an input supply range from 4.5V to 50V Input Voltage 4.5V-50V and can be used to supply up to 3A of output Single-Supply Operation current. The output voltage is adjustable down to 0.8V Power Good (PG) Output with an accuracy of 1%. The device operates with Low Radiated Emission (EMI) per EN55022, Class B programmable switching frequency from 200 kHz-600 kHz. Adjustable Current Limit architecture The MIC28303-1 uses HyperLight Load Adjustable Output Voltage from 0.9V to 24V (Also for improved efficiency at light loads. The MIC28303-2 Limited by Duty Cycle) uses Hyper Speed Control for ultra-fast transient 200 kHz to 600 kHz, Programmable Switching response. Frequency The MIC28303 offers a full suite of protection features. Supports Safe Start-Up into a Prebiased Output These include undervoltage lockout, internal soft-start, 40C to +125C Junction Temperature Range foldback current limit, hiccup mode short-circuit Available in 64-pin, 12 mm 12 mm 3 mm QFN protection and thermal shutdown. Package Applications Distributed Power Systems Industrial Medical Telecom Automotive Typical Application Circuit MIC28303 12x12 QFN VIN PVDD ANODE BSTC BSTR 4.5V to 50V PVIN VIN C1 C2,C3 2.2F 100F V OUT 5V/3A EN EN VOUT R3 16.5k C12 R1 MIC28303 SW 2.2nF 10k R15 FREQ 3.57k C10 C14 ILIM 0.1F 47F R19 FB 75k R11 1.91k C6 10pF PG PGOOD GND PGND GND 2017 Microchip Technology Inc. DS20005464B-page 12x2.2F 100F MIC28303 Functional Block Diagram PVIN BSTR BSTC VIN 4.5V to 50V D ANODE BST C IN VIN C VIN R BST BST VIN C BST N2 L IN DH VOUT PVDD SW V VIN OUT C PVDD VDD CONTROLLER ILIM-ADJ 5V/3A R1 C12 R R15 FREQ ILIM 100k 10k 2.7k 2.2nF EN N1 R3 DL EN SW 16.5k C OUT FREQ C10 PVDD 47F 0.1F FREQ 49.9k FB PGOOD FB R11 1.91k PGOOD GND PGND R19 DNP PGND GND DS20005464B-page 2 2017 Microchip Technology Inc.