LT3504IUFD#PBF

LT3504 is a step-down switching regulator. An on-chip boost regulator allows each channel to operate upto 100% duty cycle and eliminates the need for four external charge pump circuits. It is designed to minimize external component count and results in a simple and small application circuit. It operates robustly in fault conditions. Cycle by-cycle peak current limit and catch diode current limit sensing protect the part during overload conditions. Thermal shutdown protects the power switches at elevated temperatures. Soft-start helps keep the peak inductor current under control during start-up. It also features output voltage tracking and sequencing, programmable frequency, programmable undervoltage lockout, and a power good pin to indicate when all outputs are in regulation. It is widely used in application such as automotive battery regulation, industrial control supplies, wall transformer regulation, distributed supply regulation etc.

• Wide input voltage range is 3.2V to 40V
• Four 1A outputs, resistor-programmed constant frequency
• Short-circuit robust, wide SYNC range is 350KHz to 2.2MHz
• Anti-phase switching reduces ripple
• Independent run/soft-start pins
• Shutdown with UVLO, internal compensation, thermal shutdown
• Quiescent current (VIN) in shutdown is 2µA maximum at (VEN/UVLO = 0V)
• Quiescent current (VIN) is 4µA typical at (VEN/UVLO = 1V)
• Operating junction temperature is -40°C to 125°C
• Package style is 28-lead plastic QFN

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