MIC28515T-E/PHA Microchip

MIC28515 75V/5A Hyper Speed Control Synchronous DC/DC Buck Regulator with External Mode Control Features General Description Hyper Speed Control Architecture Enables: The MIC28515 is an adjustable frequency, synchronous buck regulator that features a unique - High Input to Output Voltage Conversion adaptive on-time control architecture. The MIC28515 Ratio Capability (V = 75V and V =0.6V) IN OUT operates over an input supply range of 4.5V to 75V, and - Small Output Capacitance provides a regulated output of up to 5A of output 4.5V to 75V Input Voltage current. The output voltage is adjustable down to 0.6V 5A Output Current Capability with up to 95% Efficiency with an accuracy of 1%. Adjustable Output Voltage from 0.6V to 32V Hyper Speed Control architecture allows for an ultra-fast Selectable HLL or CCM operation transient response, while reducing the output 1% FB Accuracy capacitance, and also makes high-V /low-V IN OUT Any Capacitor Stable: operation possible. This adaptive on-time control - Zero-ESR to High-ESR Output Capacitors architecture combines the advantages of fixed 270 kHz to 800 kHz Adjustable Switching Frequency frequency operation and fast transient response in a Internal Compensation single device. Built-In 5V Regulator for Single-Supply Operation The operating mode under light load conditions can be Auxiliary Bootstrap LDO for Improving System selected between HyperLight Load (HLL) mode and Efficiency Continuous Conduction Mode (CCM) with MIC28515. Internal Bootstrap Diode HLL mode results in higher efficiency than that of the Programmable Current Limit CCM mode under light load conditions while the CCM mode keeps the switching frequency almost constant Hiccup Mode Short-Circuit Protection over the entire load current range. Thermal Shutdown Supports Safe Start-Up into a Prebiased Output The MIC28515 offers a full suite of features that ensure 40C to +125C Junction Temperature Range the protection of the Integrated Circuit (IC) during Fault conditions. These features include Undervoltage Available in 32-Pin, 6 mm x 6 mm VQFN Package Lockout (UVLO) to ensure proper operation under Applications power sag conditions, soft start to reduce inrush current, Hiccup mode short-circuit protection and thermal Distributed Power Systems shutdown. Communications/Networking Infrastructure Industrial Power Supplies Solar Energy Typical Application Circuit MIC28515 2.2 PV DD SV IN 2.2 F 1 F 2.2 V IN V V IN DD 9V to 75V 2.2 F 2.2 F x 3 PG BST 0.1 F EN 8.2 H MODE VOUT SW 1.42 k 5V/5A 16.2 k I LIM 47 F 10 k 4.7 nF 0.1 F 200 k VIN FB FREQ 1.37 k 100 k EXTVDD EXTVDD 1 F AGND PGND 2017 Microchip Technology Inc. DS20005762B-page 1MIC28515 Package Type MIC28515 6 mm x 6 mm 32-Lead VQFN 32 31 29 28 27 26 25 30 I 1 24 EN LIM PGND 2 23 EXTVDD PGND 22 PGND SW 3 PV 21 BST 4 DD 20 SW V 5 IN 19 PGND V 6 IN 18 PGND V V 7 SW IN IN 17 PGND V 8 IN 910 11 12 13 14 15 16 Functional Block Diagram MIC28515 V DD SVIN V R DD 3 HV LDO FREQ V PVDD DD R 5 FIXED T UVLO ON R 4 ESTIMATE LV LDO PVIN VIN MODIFIED 5V to 75V BST EXTVDD T OFF C IN 4.6V HSD C BOOST CONTROL V DD L LOGIC SW V OUT EN TIMER 3.3V/5A EN SOFT- I CL START 135 A R CL I LIM R C 1 FF C OUT R THERMAL INJ OVERCURRENT P VDD SHUTDOWN PROTECTION C INJ SGND LSD SW PGND ZERO CROSSING MODE DETECTION COMPENSATION g EA m FB COMP V DD R 2 PG V REF 0.6V 0.9 DS20005762B-page 2 2017 Microchip Technology Inc. V PG IN V SV IN IN V V IN DD SW PGND SW AGND SW FB SW MODE PGND FREQ