LT1076CT-5#PBF | Linear Technology

Step-Down Switching Regulator, LT1076CT-5#PBF, Linear Technology

The LT1076CT-5#PBF 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 components, 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-to-negative converter, a negative boost converter, and as a flyback converter. The switch output is specified to swing 40V below ground, allowing the LT1076CT-5#PBF to drive a tapped inductor in the buck mode with output currents up to 4A.

The LT1076CT-5#PBF 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 LT1076CT-5#PBF 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.

Features

• 2A On-Board Switch
• Greatly Improved Dynamic Behavior

Applications

• 5V Output Buck Converter
• Tapped Inductor Buck Converter with 4A Output at 5V
• Positive-to-Negative Converter