LT1076-5 Datasheet | Linear Technology

LT1076-5 5V Step-Down Switching Regulator Features s s s s s s s s DESCRIPTIO Fixed 5V Output 2A On-Board Switch 100k Hz Switching Frequency 2% Output Voltage Tolerance Over Temperature Greatly Improved Dynamic Behavior Available in Low Cost 5-Lead Package Only 9.5m A Quiescent Current Operates Up to 60V Input APPLICATI s s S s 5V Output Buck Converter Tapped Inductor Buck Converter with 4A Output at 5V Positive-to-Negative Converter The LT1076-5 is a 2A fixed 5V output monolithic bipolar switching regulator which requires only a few external parts for normal operation. The power switch, all oscillator and control circuitry, all current limit ponents, and an output monitor are included on the chip. The topology is a classic positive “buck” configuration but several design innovations allow this device to be used as a positive-tonegative converter, a negative boost converter, and as a flyback converter. The switch output is specified to swing 40V below ground, allowing the LT1076-5 to drive a tapped inductor in the buck mode with output currents up to 4A. The LT1076-5 uses a true analog multiplier in the feedback loop. This makes the device respond nearly instantaneously to input voltage fluctuations and makes loop gain independent of input voltage. As a result, dynamic behavior of the regulator is significantly improved over previous designs. On-chip pulse by pulse current limiting makes the LT10765 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 configurations. The LT1076-5 is available in a low cost 5-lead TO-220 package with frequency pre-set at 100k Hz and current limit at 2.6A. See Application Note 44 for design details. TYPICAL APPLICATI 8V TO 40V Basic Positive Buck Converter 100µH- - † VIN LT1076-5 SENSE GND VC R3 1.5k VSW MBR340- 5V ≤1.8A - MBR330P MAY BE USED FOR VIN ≤ 25V - - COILTRONICS #100-1-52...