CM2596-12

20 AUGUST 2004 NO. _____ REV 1-04 DATA SHEET CM2596-XX SERIES 3A STEP-DOWN VOLTAGE REGULATORS P R INA M I L RE Y CM2596-xx series CONTENTS Page REPLACEMENT OF: LM 2596 CONTENTS FEEDFORWARD CATCH DIODE SELECTION MODE OPERATION CAPACITOR Page PIN DESCRIPTION INTERNAL BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS OPERATING CONDITIONS ELECTRICAL CHARACTERISTICS CM 2596-3.3 CM 2596-5.0 CM 2596-12.0 CM 2596-ADJ ALL OUTPUT ELECTRICAL VOLTAGE VERSIONS CHARACTERISTICS (NOTES) 2 2 2 2 3 3 3 3 3 3 4 4 5 5 6 6 7 7 8 9 9 10 11 12 12 12 12 13 INDUCTOR DISCONTINUOUS OUTPUT OPEN VOLTAGE RIPPLE AND TRANSIENTS CORE INDUCTORS THERMAL CONSIDERATIONS DELAYED STARTUP LOCKOUT UNDERVOLTAGE INVERTING REGULATOR SHUTDOWN METHODS PHYSICAL DIMENSIONS AND MARKING DIAGRAM TO-220-5 TO-220-5h TO-263-5 ORDERING INFORMATION STANDARD TEST CIRCUITS AND LAYOUT GUIDES APPLICATION INFORMATION INPUT CAPACITOR GENERAL DESCRIPTION The CM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, and a fixed-frequency oscillator. The CM2596 series operates at a switching frequency of 150 kHz thus allowing smaller sized...