Descriptions

The ZCC5143 is a 65V synchronous step-down DC/DC controller for high current single or dual outputs. The device features an interleaved, stackable peak current mode control architecture for simple loop compensation, fast transient response, excellent load and line regulation, and precise current sharing through parallel phasing for high output currents. 65ns of ultra-short on-time for the high-side switch facilitates large buck ratios and supports direct buck conversion from 12V, 24V, or 48V automotive inputs to lower voltage rails, reducing system complexity and solution cost. The can continue to operate at nearly 100% duty cycle as needed even when the input voltage drops abruptly to 3.5V. Ultra-high efficiency is achieved by Using an inductor DCR to detect the current, and a shunt resistor can be used to detect it with high accuracy. 15uA no-load quiescent current and regulated output voltage extends the operating runtime of battery-powered systems. The can be powered by the output of a switching regulator or other available power sources. By utilizing the output of a switching regulator or other available power supply to power the , lower input quiescent current and power loss can be achieved. 

Features 

 VIN input voltage range: +3.5V ~ +65V 

 1% accuracy, 3.3V/5V fixed or 0.6V to 55V adjustable output voltage 

 Shutdown Mode Current: 4µA (Typ.) 

 No-load standby current: 15 µA (Typ.) 

 Dual channel or single output multi-phase

 65ns tON(min) for high VIN/VOUT ratio 

 60ns tOFF(min) for low voltage drop 

 Hiccup mode over-current protection

 VCC, VDDA and Gate Drive UVLO Protection 

 Thermal shutdown protection with hysteresis

 Adaptive Gate Driver Controlled by Voltage Slew Rate 

 Switching frequency range of 100kHz to 2.2MHz 

 Optional diode emulation or FPWM 

 VQFNP6X6-40 package

Applications

 Automotive Electronic Systems 

 Advanced Driver Assistance System(ADAS)

 Infotainment & Instrumentation Systems

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