The MAX767RCAP is a high-efficiency, synchronous buck controller IC dedicated to converting a fixed 5V supply into a tightly regulated 3.3V output. Two key features set this device apart from similar, low-voltage step-down switching regulators: high operating frequency and all N-channel construction in the application circuit. The 300kHz operating frequency results in very small, low-cost external surface-mount components. The inductor, at 3.3μH for 5A, is physically at least five times smaller than inductors found in competing solutions. All N-channel construction and synchronous rectification result in reduced cost and highest efficiency. Efficiency exceeds 90% over a wide range of loading, eliminating the need for heatsinking. Output capacitance requirements are low, reducing board space and cost. The MAX767RCAP is a monolithic BiCMOS IC available in 20-pin SSOP packages. For other fixed output voltages and package options, please consult the factory.
Feature
- >90% Efficiency
- 700μA Quiescent Supply Current
- 120μA Standby Supply Current
- 4.5V-to-5.5V Input Range
- Low-Cost Application Circuit
- All N-Channel Switches
- Small External Components
- Tiny Shrink-Small-Outline Package (SSOP)
- Predesigned Applications:
- Standard 5V to 3.3V DC-DC Converters up to 10A
- High-Accuracy Pentium P54C VR-Spec Supply
- Fixed Output Voltages Available:
- 3.3V (Standard)
- 3.45V (High-Speed Pentium?)
- 3.6V (PowerPC?)
Applications
- Local 5V-to-3.3V DC-DC Conversion
- Microprocessor Daughterboards
- Power Supplies Up to 10A or More
