Catalog
28V/9A DC-DC Buck Regulator w/Hyper Light Load™
Key Features
• * Hyper Speed Control™ architecture enable
• * High delta V operation (VIN = 28V and VOUT = 0.8V)
• * Small output capacitance
• * Input voltage range: 4.5V to 28V
• * 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
Description
AI
The MIC26903 is a constant-frequency, synchronous DC/DC buck regulator featuring adaptive on-time control architecture. The MIC26903 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. MIC26903 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. HyperLight 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 MIC26903 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 MIC26903 includes a Power Good (PG) output to allow simple sequencing.