MICROCHIP MIC261203YJL-TR

The Micrel MIC261203 is a constant-frequency, synchronous DC/DC buck regulator featuring adaptive ontime control architecture. The MIC261203 operates over a supply range of 4.5V to 28V. It has an internal linear regulator which provides a regulated 5V to power the internal control circuitry. MIC261203 operates at a constant 600kHz switching frequency in continuous conduction mode and can be used to provide up to 12A of output current. The output voltage is adjustable down to 0.8V. Micrel’s Hyper Light Load architecture provides the same high-efficiency and ultra-fast transient response as the Hyper Speed Control architecture under medium to heavy loads, but also maintains high efficiency under light load conditions by transitioning to variable frequency, discontinuous mode operation. The MIC261203 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, thermal shutdown, internal soft start to reduce the inrush current, foldback current limit and “hiccup” mode short-circuit protection. The MIC261203 includes a Power Good (PG) output to allow simple sequencing.

• Hyper Light Load efficiency – up to 80% at 10mA
• Hyper Speed Control architecture enables:
  • High Delta V operation (VIN = 28V and VOUT = 0.8V)
  • Small output capacitance
• Input voltage range: 4.5V to 28V
• Output current up to 12A
• Up to 95% efficiency
• Adjustable output voltage from 0.8V to 5.5V
• ±1% FB 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
• 5mm×6mm MLF package
• -40°C to +125°C junction temperature range

• Distributed power systems
• Telecom/networking infrastructure
• Printers, scanners, graphic cards and video cards