ISL78225

• Product Introduction

Key features:

Peak current mode PWM-controlled adjustable slope compensation Precision resistor/DCR current sensing 2, 3 or 4 phase operation Tunable phase drop/diode emulation/pulse skipping high efficiency at light loads Adjustable switching frequency or external synchronization to 75kHz at 1MHz per phase Over-temperature/overvoltage protection 2V ± 1.0% internal reference Lead-Free 44-Pin 10X10 EP-TQFP (RoHS Compliant) -40°C to +125°C operating temperature range AEC-Q100 qualified TS16949 regulations description

ISL78225 4-phase controllers are designed for applications that require high efficiency (> 95%) and high power. The multiphase boost converter architecture uses staggered time multiplied by channel ripple frequency and reduced input and output ripple. Fewer input/output capacitors, resulting in lower component costs and lower ripple results with a smaller implementation area. ISL78225 has a dedicated pin to start dropping phase, higher efficiency at light loads, based on load current drop phase plan, resulting in significantly reduced switching and core losses in the converter. As the load increases, the descending phase (S) is added back to adapt to the heavy load transients and improve work efficiency. Input current detection is continuous by measuring voltage, through a dedicated current detection resistor or inductor DCR. This current sensing provides precise channel current equalization with per-phase overcurrent protection. A separate cumulative current limit function provides overcurrent protection for all bonded stages. The current protection in these two stages provides the highest performance and reliability of the circuit. ISL78225 can also provide voltage tracking via the VREF2 pin. Compare the reference voltage to VREF2 pin or internal reference 2V low. Through a resistor network between the VIN and VREF2 pins, the output voltage tracks the output power when the input voltage is limited to the vehicle's starting conditions. ISL78225 can output clock signals, in order to expand the scale of operation, in 8 stages, it provides high flexibility of the system. The threshold-sensitive enable input can accurately coordinate the ISL78225 start-up with any other voltage rail.