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  4. Microchip — MIC28514/5/6/7 DC/DC Buck Regulators

Microchip — MIC28514/5/6/7 DC/DC Buck Regulators

Microchip

MIC285xx Family of Hyper Speed Control® Synchronous DC/DC Buck Regulators

Enabling ultra-fast transient response while reducing the output capacitance

Microchip MIC28514/5/6/7 DC/DC Buck Regulators are adjustable frequency, synchronous buck regulators that feature a unique adaptive on-time control architecture. These regulators are perfectly suited for supplying processor core voltages with an additional benefit: A very low output ripple voltage throughout the entire load range with the use of small output capacitors.

The MIC28514/15 operates over an input supply range of 4.5V to 75V, and provides a regulated output current of up to 5A. The output voltage is adjustable down to 0.6V with an accuracy of ±1%.

The MIC28516/17 operates over an input supply range of 4.5V to 70V and provides a regulated output current of up to 8A. The output voltage is adjustable down to 0.6V, with an accuracy of ±1%.

The MIC28514-17 offer 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.

Hyper Speed Control®

Microchip’s 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.

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Features (MIC28514/5)
  • 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
  • ±1% FB Accuracy
  • Any Capacitor™ Stable:
    • Zero-ESR to High-ESR output capacitors
  • 270 kHz to 800 kHz Adjustable Switching Frequency
  • Internal Compensation
  • Built-in 5V Regulator for Single-Supply Operation
  • Auxiliary Bootstrap LDO for Improving System Efficiency
  • Internal Bootstrap Diode
  • Adjustable Soft Start Time
  • 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
Features (MIC28516/7)
  • Hyper Speed Control® Architecture Enables:
    • High input to output voltage conversion ratio capability (VIN = 70V and VOUT = 0.6V)
    • Small output capacitance
  • 4.5V to 70V Input Voltage
  • 8A Output Current Capability with Up to 95% Efficiency
  • Adjustable Output Voltage from 0.6V to 32V
  • Selectable HyperLight Load® (HLL) or Continuous Conduction Mode (CCM) Operation
  • ±1% FB Accuracy
  • Any Capacitor™ Stable:
    • Zero-ESR to High-ESR output capacitors
  • 270 kHz to 800 kHz 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
Applications
  • Distributed Power Systems
  • Communications/Networking Infrastructure
  • Industrial Power Supplies
  • Solar Energy