LT1176CSW#PBF

LT1176CSW#PBF is a 1A 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 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 below ground. The LT1176 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. As a result, dynamic behaviour of the regulator is significantly improved over previous designs. Applications include buck converter with output voltage range of 2.5V to 30V, positive-to-negative converter, negative boost converter, multiple output buck converter.

• Excellent dynamic behaviour, micropower shutdown mode
• Supply current is 7.5mA typical at (VFB = 2.5V, VIN ≤ 35V)
• Switch current limit is 1.7A typical at (ILIM open)
• Maximum duty cycle is 90% typical
• Switching frequency is 100KHz typical at (TA = 25°C)
• Shutdown pin current is 10µA typical at (VSHDN = 5V)
• Error amplifier voltage gain is 2000V/V typical at (1V ≤ VC ≤ 4V, TA = 25°C)
• Error amplifier source and sink current is 140µA typical at (source (VFB = 2V or VSENSE = 4V))
• Operating temperature range from 0°C to 125°C
• 20-lead plastic SOL package

Notes

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