MAX728

19-0182; Rev 3; 9/95 5V/3.3V/3V 5A Step-Down, PWM, Switch-Mode DC-DC Regulators _______________General Description The MAX787/MAX788/MAX789 are monolithic, bipolar, pulse-width modulation (PWM), switch-mode, step-down DC-DC regulators. Each is rated at 5A. Very few external components are needed for standard operation because the power switch, oscillator, feedback, and control circuitry are all on-chip. Employing a classic buck topology, these regulators perform high-current step-down functions. The MAX787/MAX788/MAX789 have excellent dynamic and transient response characteristics, while featuring cycle-by-cycle current limiting to protect against overcurrent faults and short-circuit output faults. They also have a wide 8V to 40V input range. Each regulator is available in a 5-pin TO-220 package. These devices have a preset 100kHz oscillator frequency and a preset current limit of 6.5A. See the MAX724/ MAX726 data sheet for more applications information. ___________________________Features o Input Range: Up to 40V o 5A On-Chip Power Switch o Fixed Outputs: 5V (MAX787) 3.3V (MAX788) 3V (MAX789) o 100kHz Switching Frequency o Excellent Dynamic Characteristics o Few External Components o 8.5mA Quiescent Current o TO-220 Package MAX787/MAX788/MAX789 ______________Ordering Information PART MAX787CCK MAX787ECK MAX788CCK MAX788ECK MAX789CCK MAX789ECK TEMP. RANGE 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C PIN-PACKAGE 5 TO-220 5 TO-220 5 TO...