Microchip MIC2133

The MIC2133 is a constant on-time, dual phase synchronous buck controller featuring a unique adaptive ON-time control architecture with Hyperlight Load® and phase shedding features. The MIC2133 operates over an input supply range from 4.5V to 75V and can be used to supply up to 50A of output current. The input voltage could be lowered to 2V provided that an external VDD of 5V is provided. The output voltage of the MIC2133 is adjustable down to 0.6V with a guaranteed accuracy of ±1% over the entire operating temperature. The reference accuracy is also  guaranteed to ±0.5% over a limited temperature range of -–40°C to +105°C. The MIC2133 operates with programmable switching frequency from 100kHz to 1MHz per phase. The Hyper Speed Control® architecture supports ultrafast transient response under medium to heavy load conditions. The soft start is also programmable externally with a capacitor, thus enabling safe start-ups into heavy loads. The MIC2133 has a remote sense amplifier for accurate output voltage control as well as user selectable automatic phase shedding for improved efficiency at medium loads. The controller offers a droop feature for enabling adaptive voltage scaling and control to improve load transient response The MIC2133 offers a full suite of protection features to ensure protection of the IC during fault conditions. These include under-voltage lockout to ensure proper operation under power-sag conditions, programmable soft start to reduce inrush current, overvoltage discharge, hiccup mode short-circuit protection and thermal shutdown. The MIC2133 is available in a 32-pin 5mm x 5mm VQFN package with a –40°C to +125°C junction operating temperature range.

Features

• Input voltage range of 4.5V to 75V
• Input down to 2V when VDD = 5V from an external supply
• Adjustable output voltage from 0.6V to 28V
• 0.6V internal reference with ±1% accuracy
• ±0.5% reference accuracy for -40°C to 105°C
• HyperLight Load and automatic phase shedding
• 100 kHz to 1 MHz switching frequency per phase
• High-voltage internal 5V LDO for single-supply operation
• Droop feature to support Adaptive Voltage Positioning (AVP)
• Programmable current limit and hiccup mode short-circuit protection
• Thermal shutdown with hysteresis
• Junction temperature range of −40°C to +125°C
• Remote sense amplifier for tight output regulation
• Supports start-up to pre-bias output
• External programmable soft start to reduce inrush current
• Accurate current balancing between phases
• Compact size 5 mm × 5 mm, 32-pin VQFN package
• AEC-Q100 qualified (VAO suffix)

Applications

• Automotive POL
• Communications/networking infrastructure
• Distributed power systems
• Printers, scanners, graphics and video cards

EV66P64A - MIC2133 Evaluation Board

The MIC2133 is an enhanced adaptive on-time, synchronous 2 phase buck controller featuring a proprietary Host/User control architecture. This advanced control architecture will enable optimal current sharing of phases in host and user modes with the option of cascading several user devices in parallel to increase current capability of the entire solution.  

The MIC2133 operates over an input supply range from 4.5V to 75V and can be used to supply up to 50A of output current. The output voltage is adjustable down to 0.6V with a guaranteed accuracy of ±1%. The device operates with programmable switching frequency from 100 kHz to 800 kHz per phase. The MIC2133 is available in a 32 pin 5mm x 5mm QFN with a junction operating range from –40°C to +125°C.