The MIC24055 is a constant-frequency, synchronous buck regulator featuring a unique adaptive on-time control architecture. The MIC24055 operates over an input supply range of 4.5V to 19V and provides a regulated output of up to 12A of output current. The output voltage is adjustable down to 0.8V with a guaranteed accuracy of ±1%, and the device operates at a switching frequency of 600kHz.

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 MIC24055 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, internal soft-start to reduce inrush current, foldback current limit, "hiccup mode" short-circuit protection and thermal shutdown. An open-drain power good (PG) pin is provided. Also see the 12A HyperLight Load^® part, MIC24056.

• Hyper Speed Control™ architecture enables
• High delta V operation (V_IN = 19V and V_OUT = 0.8V)
• Small output capacitance
• Input voltage range: 4.5V to 19V
• Output current up to 12A
• Up to 95% efficiency
• Adjustable output voltage from 0.8V to 5.5V
• ±1% feedback accuracy
• Any Capacitor™ stable - zero-to-high ESR
• 600kHz switching frequency
• Power Good (PG) output
• Foldback current-limit and "hiccup" mode short-circuit protection
• Safe start-up into pre-biased loads
• -40°C to +125°C junction temperature range
• Available in 28-pin 5mm — 6mm QFN package