LT1076CR-5#PBF

LT1076CR-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 LT1076-5 to drive a tapped inductor in the buck mode with output currents up to 4A. The LT1076-5 uses a true analogue multiplier in the feedback loop. This makes the device respond nearly instantaneously to input voltage fluctuations and makes loop gain independent of input voltage. Applications include 5V output buck converter, tapped inductor buck converter with 4A output at 5V, positive-to-negative converter.

• 2% output voltage tolerance over temperature
• Greatly improved dynamic behaviour, operates up to 60V input
• Supply current is 8.5mA typical at (VOUT = 5.5V, VIN ≤ 40V)
• Switch current limit is 2.6A typical at (ILIM = Open)
• Maximum duty cycle is 90% typical
• Switching frequency is 100KHz typical at (TJ = 25°C)
• Shutdown pin current is 10μA typical at (TJ = 25°C, VSHDN = 5V)
• Error amplifier source and sink current is 140μA typical at (source (VSENSE = 4.5V))
• Maximum operating ambient temperature range from 0°C to 70°C
• 7-lead plastic DD package

Notes

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