MICROCHIP MIC26603YJL-TR

The Micrel MIC26603 is a constant-frequency, synchronous DC/DC buck regulator featuring adaptive ontime control architecture. The MIC26603 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. MIC26603 operates at a constant 600kHz switching frequency in continuous-conduction mode and can be used to provide up to 6A 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 MIC26603 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 MIC26603 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 6A
• Up to 95% Efficiency
• Adjustable output voltage from 0.8V to 5.5V
• ±1% FB accuracy
• Any CapacitorTM 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