LT1076-5 5V Step-Down Switching Regulator FEATURES DESCRIPTION n Fixed 5V Output The LT 1076-5 is a 2A xed 5V output monolithic bipolar n 2A On-Board Switch switching regulator which requires only a few external parts n 100kHz Switching Frequency for normal operation. The power switch, all oscillator and n 2% Output Voltage Tolerance Over Temperature control circuitry, all current limit components, and an output n Greatly Improved Dynamic Behavior monitor are included on the chip. The topology is a classic n Available in Low Cost 5- and 7-Lead Packages positive buck con guration but several design innova- n Only 9.5mA Quiescent Current tions allow this device to be used as a positive-to-negative n Operates Up to 60V Input converter, a negative boost converter, and as a yback con- verter. The switch output is speci ed to swing 40V below APPLICATIONS ground, allowing the LT1076-5 to drive a tapped inductor in the buck mode with output currents up to 4A. n 5V Output Buck Converter n Tapped Inductor Buck Converter with 4A Output at The LT1076-5 uses a true analog multiplier in the feedback 5V loop. This makes the device respond nearly instantaneously n Positive-to-Negative Converter to input voltage uctuations and makes loop gain indepen- dent of input voltage. As a result, dynamic behavior of the regulator is signi cantly improved over previous designs. On-chip pulse by pulse current limiting makes the LT1076- 5 nearly bust-proof for output overloads or shorts. The input voltage range as a buck converter is 8V to 60V, but a self-boot feature allows input voltages as low as 5V in the inverting and boost con gurations. The LT1076-5 is available in a low cost 5- and 7-lead TO- 220 packages with frequency pre-set at 100kHz and current limit at 2.6A. See Application Note 44 for design details. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Basic Positive Buck Converter 100H** 5V V V 8V TO 40V IN SW 1.8A LT1076-5 MBR340* MBR330P MAY BE USED * FOR V 25V IN SENSE COILTRONICS 100-1-52 ** GND V C HURRICANE HL-AG210LL R3 VALUE MAY BE REDUCED TO 50H 1.5k + + FOR OUTPUT LOADS BELOW 1.5A C1 C3 C2 200F 0.033F 500F 25V LT1076-5 TA01 10765fc 1LT1076-5 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Voltage Sense Pin Voltage ............................................ 2V, 10V LT1076-5 .............................................................45V Maximum Operating Ambient Temperature Range LT1076HV-5 .........................................................64V LT1076C-5, LT1076HVC-5 ....................... 0C to 70C Switch Voltage with Respect to Input Voltage LT1076I-5, LT1076HVI-5 ..................... 40C to 85C LT1076-5 ..............................................................64V Maximum Operating Junction Temperature Range LT1076HV-5 .........................................................75V LT1076C-5, LT1076HVC-5 ..................... 0C to 125C Switch Voltage with Respect to Ground Pin LT1076I-5, LT1076HVI-5 ................... 40C to 125C (V Negative) Maximum Storage Temperature ............ 65C to 150C SW LT1076-5 (Note 6) ................................................35V Lead Temperature (Soldering, 10 sec) .................. 300C LT1076HV-5 (Note 6) ...........................................45V PACKAGE/ORDER INFORMATION FRONT VIEW ORDER PART ORDER PART FRONT VIEW 5 V IN 7 SHDN NUMBER NUMBER 6 V 4 V C SW 5 SENSE TAB IS 3 GND 4 GND GND 3 I LIM LT1076CQ-5 LT1076CR-5 2 V C 2 V SW 1 V IN 1 FB/SENSE R PACKAGE Q PACKAGE 7-LEAD PLASTIC DD 5-LEAD PLASTIC DD = 4C/W, = 30C/W JC JA = 4C/W, = 30C/W JC JA FRONT VIEW ORDER PART ORDER PART FRONT VIEW 5 V IN 7 SHDN NUMBER NUMBER 4 V TAB SW 6 V C IS 3 GND TAB 5 SENSE GND IS GND 2 V 4 C LT1076CT-5 LT1076CT7-5 3 I GND LIM 1 SENSE V 2 SW 1 V IN LT1076HVCT-5 T PACKAGE 5-LEAD PLASTIC TO-220 T7 PACKAGE LT1076IT-5 7-LEAD PLASTIC TO-220 LEADS ARE FORMED STANDARD FOR STRAIGHT LEADS, ORDER FLOW 06 = 4C/W, = 50C/W JC JA LT1076HVIT-5 = 4C/W, = 50C/W JC JA Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: