MICROCHIP MIC24054YJL-TR

The Micrel MIC24054 is a constant-frequency, synchronous DC/DC buck regulator featuring adaptive ontime control architecture. The MIC24054 operates over a supply range of 4.5V to 19V. It has an internal linear regulator which provides a regulated 5V to power the internal control circuitry. The MIC24054 operates at a constant 600kHz switching frequency in continuous conduction mode and can be used to provide up to 9A 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 MIC24054 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 MIC24054 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 (ΔVIN = 19V and VOUT = 0.8V)
  • Small output capacitance
• Input voltage range: 4.5V to 19V
• Output current up to 9A
• 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
• -40°C to +125°C junction temperature range
• Available in 28-pin 5mm×6mm QFN package

• Servers and work stations
• Routers, switches, and telecom equipment
• Base stations