MIC28512 70V , 2A Synchronous Buck Regulator IN Features General Description 4.6V to 70V Operating Input Voltage Supply The MIC28512 is a synchronous step-down switching regulator with internal power switches capable of Up to 2A Output Current providing up to 2A output current from a wide input Integrated High-Side and Low-Side N-Channel supply range from 4.6V to 70V. The output voltage is MOSFETs adjustable down to 0.8V with a guaranteed accuracy of (MIC28512-1) and Hyper HyperLight Load 1%. A constant switching frequency can be Speed Control (MIC28512-2) Architecture programmed from 200 kHz to 680 kHz. The Hyper Enable Input and Power Good (PGOOD) Output and HyperLight Load architectures of Speed Control Programmable Current-Limit and Foldback the MIC28512 allow for high V (low V ) operation IN OUT Hiccup Mode Short-Circuit Protection and ultra-fast transient response while reducing the required output capacitance and providing very good Built-In 5V Regulator for Single-Supply Operation light-load efficiency. Adjustable 200 kHz to 680 kHz Switching Frequency The MIC28512 offers a full suite of features to ensure Fixed 5 ms Soft-Start protection under fault conditions. These include undervoltage lockout to ensure proper operation under Internal Compensation and Thermal Shutdown power sag conditions, internal soft-start to reduce Thermally-Enhanced 24-Pin 3 mm x 4 mm inrush current, foldback current-limit, hiccup mode FCQFN Package short-circuit protection and thermal shutdown. 40C to +125C Junction Temperature Range Applications Industrial Power Supplies Package Type Distributed Supply Regulation MIC28512 Base Station Power Supplies 24-Pin 3 mm x 4 mm FCQFN (FL) Wall Transformer Regulation High-Voltage Single-Board Systems 23 24 22 21 20 1 DL PVDD 2 19 PGND VDD 3 18 ILIM DH 4 PVIN 17 VIN LX 5 16 EN BST 6 PGOOD 15 14 PVIN 7 FB 13 AGND PVIN 8 910 11 12 2016-2018 Microchip Technology Inc. DS20005524B-page 1 PVIN 25 (PVIN) FREQ PGND PGND 26 (PGND) PGND PGND SW SW 27 (SW)HSD LSD COMPENSATION g m MIC28512 Typical Application Circuit MIC28512 3x4 FQFN VDD PVDD BST EN ILIM V V OUT IN 5V (0A TO 2A) 6V 60V PVIN SW MIC28512 LX VIN FREQ FB AGND PGND Functional Block Diagram VIN D C BST IN C VDD VIN VDD PVDD PVIN 17 19 20 4, 7, 8, 9, 25 BST LINEAR 6 UVLO R REGULATOR BST 3 DH THERMAL M1 C BST OFF SHUTDOWN ON L SW 12, 16 VOUT 21, R3 EN 27 FIXED T LX 24 ON CONTROL 5 ESTIMATION ZCD LOGIC FREQ R4 SOFT-START C OUT 1 DL PVDD R LIM 3.3V M2 PGND R 10, PGOOD POWER GOOD 11, COMPARATOR 15 CURRENT 22, LIMIT 23, PGOOD DETECTION 26 R INJ X90% 2 PGND V REF 0.8V C 18 INJ ILIM R1 13 14 C FF FB AGND R2 DS20005524B-page 2 2016-2018 Microchip Technology Inc.