LT3742EUF#PBF

LT3742 is a dual step-down DC/DC switching regulator controller that drives high side N-channel power MOSFETs. A 500KHz fixed frequency current mode architecture provides fast transient response with simple loop compensation components and cycle-by-cycle current limiting. The output stages of the two controllers operate 180° out of phase to reduce the input ripple current, minimizing the noise induced on the input supply, and allowing less input capacitance. An internal boost regulator generates a bias rail of VIN + 7V to provide gate drive for the N-channel MOSFETs allowing low dropout and 100% duty cycle operation. It can be used for applications where both controllers need to operate independently, or where both controllers are used to provide a single higher current output. It is used in application such as satellite and cable TV set-top boxes, distributed power regulation, automotive systems, super capacitor charger etc.

• Wide input voltage range is 4V to 30V
• Wide output voltage range is 0.8V to VIN
• Out-of-phase controllers reduce required input capacitance and power supply induced noise
• Internal boost converter provides bias rail for N-channel MOSFET gate drive
• Power good voltage monitor for each output
• Programmable soft-start, switching phase is 180°
• Quiescent current is 5mA typical at (VRUN/SS1 = VRUN/SS2 = VFB1 = VFB2 = 1V)
• Shutdown current is 20µA typical at (VRUN/SS1 = VRUN/SS2 = 0V)
• Operating temperature is -40°C to 125°C
• Package style is 24-lead plastic QFN

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