LT1176CN8#PBF

LT1176 is a 1A monolithic bipolar step-down 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 allows 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. This 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 are buck converter with output voltage range of 2.5V to 30V, positive-to-negative converter, negative boost converter, multiple output buck converter.

• 1.2A on-board switch
• 100KHz switching frequency
• Excellent dynamic behaviour
• Only 8mA quiescent current
• Operates up to 35V input
• Micropower shutdown mode
• Dynamic behaviour of the regulator is significantly improved over previous designs
• 8-lead plastic DIP package
• 0°C to 125°C maximum junction temperature range

Notes

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