MIC28515T-E/PHA

The MIC28515 is an adjustable frequency, synchronous buck regulator that features a unique adaptive on-time control architecture. The MIC28515 operates over an input supply range of 4.5V to 75V and provides a regulated output of up to 5A of output current. The output voltage is adjustable down to 0.6V with an accuracy of ±1%. Hyper Speed Control architecture allows for an ultra-fast transient response, while reducing the output capacitance, and also makes high-VIN/low-VOUT operation possible. This adaptive on-time control architecture combines the advantages of fixed frequency operation and fast transient response in a single device. The operating mode under light load conditions can be selected between HyperLight Load (HLL) mode and Continuous Conduction Mode (CCM) with MIC28515. HLL mode results in higher efficiency than that of the CCM mode under light load conditions while the CCM mode keeps the switching frequency almost constant over the entire load current range. The MIC28515 offers a full suite of features that ensure the protection of the Integrated Circuit (IC) during Fault conditions. These features include Undervoltage Lockout (UVLO) to ensure proper operation under power sag conditions, soft start to reduce inrush current, Hiccup mode short-circuit protection and thermal shutdown.

Applications

• Distributed Power Systems
• Communications/Networking Infrastructure
• Industrial Power Supplies
• Solar Energy

Key features

• Hyper Speed Control Architecture Enables:
• High input to output voltage conversion ratio capability (VIN = 75V and VOUT = 0.6V)
• Small output capacitance
• 4.5V to 75V Input Voltage
• 5A Output Current Capability with up to 95% Efficiency
• Adjustable Output Voltage from 0.6V to 32V
• Selectable HLL or CCM operation
• ±1% FB Accuracy
• Any Capacitor Stable:
• Zero-ESR to High-ESR output capacitors
• 270kHz to 800kHz Adjustable Switching Frequency
• Internal Compensation
• Built-In 5V Regulator for Single-Supply Operation
• Auxiliary Bootstrap LDO for Improving System Efficiency
• Internal Bootstrap Diode
• Programmable Current Limit
• Hiccup Mode Short-Circuit Protection
• Thermal Shutdown
• Supports Safe Start-Up into a Pre-Biased Output
• -40°C to +125°C Junction Temperature Range
• Available in 32-Pin, 6 mm x 6 mm VQFN Package
• AEC-Q104 Qualified (Parts with VAO Suffix)