The MIC26400 is a constant-frequency, synchronous buck regulator featuring a unique digitally modified adaptive ON-time control architecture. The MIC26400 operates over an input supply range of 4.5V to 26V and provides a regulated output at up to 5A of output current. The output voltage is adjustable down to 0.8V with a typical accuracy of ±1%, and the device operates at a switching frequency of 300kHz.

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 digitally modified adaptive t_ON ripple control architecture combines the advantages of fixed frequency operation and fast transient response in a single device.

The MIC26400 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 (V_IN = 26V and V_OUT = 0.8V)
• Small output capacitance
• 4.5V to 26V input voltage
• Adjustable output from 0.8V to 5.5V (±1% accuracy)
• Any Capacitor™ Stable
• Zero ESR to high-ESR output capacitance
• 5A output current capability
• 300kHz switching frequency
• Internal compensation
• Up to 95% efficiency
• 6ms Internal soft-start
• Foldback current limit and "hiccup" mode short-circuit protection
• Thermal shutdown
• Supports safe start-up into a pre-biased load
• -40°C to +125°C junction temperature range