MIC26950YJL-TR

The Micrel MIC26950 is a constant-frequency, synchronous buck regulator featuring a unique digitally modified adaptive ON-time control architecture. The MIC26950 operates over an input supply range of 4.5V to 26V and provides a regulated output at up to 12A 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. Micrel’s Hyper Speed ControlTM architecture allows for ultrafast transient response while reducing the output capacitance and also makes (High VIN)/(Low VOUT) operation possible. This digitally modified adaptive tON ripple control architecture combines the advantages of fixed-frequency operation and fast transient response in a single device. The MIC26950 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, fold-back current limit, “hiccup” mode shortcircuit protection and thermal shutdown.

Applications

• Distributed power systems
• Communications/networking infrastructure
• Set-top box, gateways and routers
• Printers, scanners, graphic cards and video cards

Key features

• Hyper Speed ControlTM architecture enables
• High delta V operation (VIN = 26V and VOUT = 0.8V)
• Small output capacitance
• 4.5V to 26V input voltage
• Adjustable output from 0.8V to 5.5V (±1% accuracy)
• Any CapacitorTM Stable - Zero-ESR to high-ESR output capacitance
• 12A 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
• 28-pin 5mm X 6mm MLF package