The MIC26901 is a constant-frequency, synchronous buck regulator featuring a unique adaptive on-time control architecture. The MIC26901 operates over an input supply range of 4.5V to 28V and provides a regulated output of up to 9A 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 V_IN)/(Low V_OUT) operation possible. This adaptive t_ON ripple control architecture combines the advantages of fixed-frequency operation and fast transient response in a single device. The MIC26901 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.

• Hyper Speed Control™ architecture enables
• High delta V operation (V_IN = 28V and V_OUT = 0.8V)
• Small output capacitance
• 4.5V to 28V voltage input
• 9A output current capability, up to 95% efficiency
• Adjustable output from 0.8V to 5.5V
• ±1% feedback accuracy
• Any Capacitor™ stable -zero-to-high ESR
• 600kHz switching frequency
• No external compensation
• Power Good (PG) output
• Foldback current-limit and "hiccup mode" short-circuit protection
• Supports safe startup into a pre-biased load
• -40°C to +125°C junction temperature range