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MIC28500 Buck Regulator

75 V, 4 A Hyper Speed Control™ synchronous DC-DC buck regulator from Micrel

Micrel's MIC28500 Buck RegulatorThe Micrel MIC28500 is an adjustable frequency, synchronous buck regulator featuring unique adaptive on-time control architecture. The MIC28500 operates over an input supply range of 30 V to 75 V and provides a regulated output of up to 4 A of output current. The output voltage is adjustable down to 0.8 V with a guaranteed accuracy of ± 1%.

Micrel's Hyper Speed Control™ architecture allows for ultra-fast transient response while reducing the output capacitance and also makes (High VIN)/(Low VOUT) operation possible. This adaptive tON ripple control architecture combines the advantages of fixed-frequency operation and fast transient response in a single device.

The MIC28500 offers a full suite of protection features to ensure protection of the IC during fault conditions. These include undervoltage lockout to ensure proper operation under power-sag conditions, internal soft-start to reduce inrush current, foldback current limit, “hiccup” mode short-circuit protection and thermal shutdown.

  • Hyper Speed Control™ architecture enables
    • High Delta V operation (VIN = 75 V and VOUT = 0.8 V)
    • Small output capacitance
  • 30 V to 75 V voltage input
  • Any Capacitor™ Stable
    • Zero-ESR to high-ESR output capacitors
  • 4 A output current capability, up to 90% efficiency
  • ±1% FB accuracy
  • 100 kHz to 500 kHz switching frequency
  • Adjustable output down to 0.8 V
  • Internal compensation
  • Foldback current-limit and “hiccup” mode
    short-circuit protection
  • Thermal shutdown
  • Supports safe startup into a pre-biased load
  • –40°C to +125°C junction temperature range
  • 28-pin 5 mm x 6 mm MLF® package

Digi-Key P/N Manufacturer P/N Packaging Description  
576-3969-2-ND MIC28500YJL TR Tape & Reel IC BUCK SYNC ADJ 4A 28MLF Datasheet
576-3969-1-ND Cut Tape
576-3969-6-ND Digi-Reel®