LT1074HVCT#PBF

LT1074 is a 5A monolithic bipolar switching regulator which requires only a few external parts for normal operation. The power switch, all oscillator and control circuitry, and all current limit components, are included on chip. 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 LT1074 to drive a tapped inductor in the buck mode with output currents up to 10A. The LT1074 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 behaviour of the regulator is significantly improved over previous designs. Used in buck converter with output voltage range of 2.5V to 50V, tapped-inductor buck converter with 10A output at 5V.

• Frequency pre-set at 100KHz and current limit at 6.5A
• Used in positive-to-negative converter, negative boost converter and multiple output buck converter
• Operates up to 60V input, 100KHz switching frequency, greatly improved dynamic behaviour
• Only 8.5mA quiescent current
• Programmable current limit
• Micropower shutdown mode
• Maximum switch ON voltage of 1.85V (SW = 1A, Tj ≥ 0°C)
• Maximum switch OFF leakage of 300µA (VIN ≤ 25V, VSW = 0)
• Maximum duty cycle of 90%, typical switching frequency of 100KHz at TA = 25°C
• 5-lead plastic TO-220 package

Notes

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