The MAX767 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 MAX767 is a monolithic BiCMOS IC available in 20-pin SSOP packages. For other fixed output voltages and package options, please consult the factory.
The MAX767 is a high‑efficiency, synchronous buck controller IC that converts a fixed 5 V supply to a tightly regulated 3.3 V output. It operates at a 300 kHz oscillator frequency, uses all N‑channel switches, and achieves over 90 % efficiency without heatsinking.
Key features include a 20‑pin SSOP package, input range 4.5 V‑5.5 V, output currents up to 10 A, low quiescent current (≈700 µA), and a variety of pre‑designed application circuits. The datasheet provides absolute maximum ratings, electrical characteristics, pin descriptions, layout recommendations, and component value tables for designers.
| Efficiency | >90 % over wide load range |
|---|---|
| Oscillator Frequency | 300 kHz |
| Standby Supply Current | ≈120 µA |
| Maximum Output Current | up to 10 A |
| Package | 20‑pin SSOP |
Efficiency exceeds 90 % over a wide range of load conditions.
The controller runs at a 300 kHz oscillator frequency.
It is available in a 20‑pin SSOP package.