Simplified Block Diagram
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- Dual PWM Buck Controllers (+3.3V and +5V)
- Dual PCMCIA VPP Outputs (0V/5V/12V)
- Three Precision Comparators or Level Translators
- 95% Efficiency
- 420µA Quiescent Current; 70µA in Standby (linear regulators alive)
- 5.5V to 30V Input Range
- Small SSOP Package
- Fixed Output Voltages Available:
- 3.3 (standard)
- 3.45 (High-Speed Pentium)
- 3.6 (PowerPC)
- 3.3 (standard)
- Communication Systems
- Notebook Computers
- Pen-Entry Systems
- Portable Data Terminals
High efficiency (95% at 2A; greater than 80% at loads from 5mA to 3A) is achieved through synchronous rectification and PWM operation at heavy loads, and Idle-Mode™ operation at light loads. It uses physically small components, thanks to high operating frequencies (300kHz/200kHz) and a new current-mode PWM architecture that allows for output filter capacitors as small as 30µF per ampere of load. Line- and load-transient response are terrific, with a high 60kHz unity-gain crossover frequency allowing output transients to be corrected within four or five clock cycles. Low system cost is achieved through a high level of integration and the use of low-cost, external N-channel MOSFETs. The integral flyback winding controller provides a low-cost, +15V high-side output that regulates even in the absence of a load on the main output.
Other features include low-noise, fixed-frequency PWM operation at moderate to heavy loads and a synchronizable oscillator for noise-sensitive applications such as electromagnetic pen-based systems and communicating computers. The MAX782 is a monolithic BiCMOS IC available in fine-pitch, SSOP surface-mount packages.