Microchip | MIC2182-3.3YM

The MIC2182-3.3YM is a synchronous buck (step-down) switching regulator controller. An all N-channel synchronous architecture and powerful output drivers allow up to a 20 A output current capabilty.

The PWM and skip-mode control scheme allows efficiency to exceed 95% over a wide range of load current, making it ideal for battery powered applications, as well as high current distributed power supplies. The MIC2182 operates from a 4.5 V to 32 V input and can operate with a maximum duty cycle of 86% for use in low-dropout conditions.

Features:

• 4.5 V to 32 V Input voltage range
• 1.25 V to 6 V Output voltage range
• 95% efficiency
• 300 kHz oscillator frequency
• Current sense blanking
• 5 impedance MOSFET Drivers
• Drives N-channel MOSFETs
• 600 µA typical quiescent current (skip-mode)
• Logic controlled micropower shutdown (IQ < 0.1 µA)
• Current-mode control
• Cycle-by-cycle current limiting
• Built-in undervoltage protection
• Adjustable undervoltage lockout
• Easily synchronizable
• Precision 1.245 V reference output
• 0.6% total regulation
• 16-pin SOP and SSOP packages
• Frequency foldback overcurrent protection
• Sustained short-circuit protection at any input voltage
• 20 A output current capability

Applications:

• DC power distribution systems
• Notebook and subnotebook computers
• PDAs and mobile communicators
• Wireless modems
• Battery-operated equipment