MAX786CAI

The MAX786CAI from Maxim Integrated is a versatile power-supply controller engineered for applications such as notebook computers and portable data terminals. It integrates two high-performance step-down (buck) pulse-width modulators (PWMs) capable of delivering +3.3V and +5V outputs. The device also includes dual low-dropout, micropower linear regulators for CMOS/RTC back-up and two precision low-battery-detection comparators.

Achieving high efficiency up to 95% at a 2A load, the MAX786CAI utilizes synchronous rectification and PWM operation for heavy loads, along with Idle Mode operation at light loads. Its high operating frequencies (300kHz/200kHz) and advanced current-mode PWM architecture allow for the use of physically small components, including output filter capacitors as small as 30µF per ampere of load. This design ensures terrific line- and load-transient responses, with a high 60kHz unity-gain crossover frequency.

The MAX786CAI operates from a wide input voltage range of 5.5V to 30V. It features low quiescent current, drawing 420µA typically (70µA in standby with linear regulators active) and only 25µA in shutdown mode with the +5V linear regulator alive. The device is available in a compact SSOP package, making it suitable for space-constrained designs. Fixed output voltages include standard 3.3V, 3.45V for High-Speed Pentium™ systems, and 3.6V for PowerPC™ applications.