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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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MAX783 Fiches technique(PDF) 1 Page - Maxim Integrated Products |
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MAX783 Fiches technique(HTML) 1 Page - Maxim Integrated Products |
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1 / 28 page  _______________General Description The MAX783 is a system-engineered power-supply controller for notebook computers or similar battery-powered equipment. It provides two high-performance step-down (buck) pulse- width modulators (PWMs) for +3.3V/+5V and dual PCMCIA VPP outputs powered by an integral flyback winding controller. Other functions include dual, low-dropout, micropower linear regulators for CMOS/RTC back up, and two precision low- battery-detection comparators. 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 TM oper- ation at light loads. The MAX783 uses physically small components, thanks to high operating frequencies (300kHz/200kHz) and a new current-mode PWM architec- ture that allows for output filter capacitors as small as 30µF per ampere of load. Line- and load-transient responses are terrific, with a high 60kHz unity-gain crossover frequen- cy that allows 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 con- troller provides a low-cost, +15V high-side output that regu- lates 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 electro- magnetic pen-based systems and communicating comput- ers. The MAX783 is similar to the MAX782, except the fly- back winding is on the 3.3V inductor instead of the 5V inductor, the VPP outputs can be optionally programmed to 3.3V, and the device may be completely shut down. ________________________Applications Notebook Computers Portable Data Terminals Communicating Computers Pen-Entry Systems ____________________________Features o Dual PWM Buck Controllers (+3.3V and +5V) o Dual PCMCIA VPP Outputs (0V/3.3V/5V/12V) o Two Precision Comparators or Level Translators o Power-Ready Status Output ( RDY5) o 95% Efficiency o Optimized for 6-Cell Applications o 420µA Quiescent Current; 70µA in Standby (linear regulators alive) 25µA Shutdown Current o 5.5V to 30V Input Range o Small SSOP Package o Fixed Output Voltages Available: 3.3V (standard) 3.45V (High-Speed Pentium™) 3.6V (PowerPC™) ______________Ordering Information Triple-Output Power-Supply Controller for Notebook Computers ________________________________________________________________ Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature. ™Idle-Mode is a trademark of Maxim Integrated Products. Pentium is a trademark of Intel. PowerPC is a trademark of IBM. 19-0045; Rev 1; 5/94 Evaluation Kit Information Included MAX783 5.5V TO 30V VPP CONTROL ON3 ON5 SYNC POWER SECTION SUSPEND POWER LOW-BATTERY WARNING VPP (0V/3.3V/5V/12V) µP MEMORY PERIPHERALS +3.3V +5V DUAL PCMCIA SLOTS 4 VPP (0V/3.3V/5V/12V) SHDN _______Typical Application Diagram 36 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SS3 CS3 FB3 DH3 LX3 BST3 LX5 DL3 V+ VL FB5 PGND DL5 BST5 SYNC REF GND VPPB VDD VPPA RDY5 Q1 Q2 VH D2 D1 SHDN ON3 SSOP TOP VIEW MAX783 22 21 20 19 15 16 17 18 ON5 DH5 CS5 SS5 DB0 DB1 DA0 DA1 __________________Pin Configuration 36 SSOP 0°C to +70°C MAX783RCBX 36 SSOP 0°C to +70°C MAX783CBX PIN-PACKAGE TEMP. RANGE PART 3.45V 3.3V VOUT Ordering Information continued on last page. |
Numéro de pièce similaire - MAX783 |
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Description similaire - MAX783 |
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