Power by Linear™/ADI's ADP2164 and ADP2166 are synchronous, step-down DC-to-DC regulators in compact LFCSP packages. The input voltage range of the ADP2164 is 2.7 V to 6.5 V with a 4 A output. The ADP2166 is supplied from an input voltage of 2.7 V to 5.5 V with 5 A and 6 A respective output. The output voltage options include 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V fixed outputs and adjustable options capable of supporting an output voltage range from 0.6 V to 90% of the input voltage. The protection features include under-voltage lockout (UVLO), overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown (TSD) for robust performance.

The ADP2164 integrates a pair of low on-resistance P-channel and N-channel internal MOSFETs to maximize efficiency and minimize external component count. The 100% duty cycle operation allows low dropout voltage at 4 A output current. The high 1.2 MHz PWM switching frequency allows the use of small external components and the SYNC input enables multiple ICs to synchronize out-of-phase to reduce ripple and eliminate beat frequencies.

The switching frequency of the ADP2166 can be programmed from 250 kHz to 1.4 MHz or it can be fixed at 620 kHz or 1.2 MHz. The synchronization function allows the switching frequency to synchronize to an external clock minimizing the electromagnetic interference (EMI) of the system. The other key features include under-voltage lockout (UVLO), integrated soft start limits inrush current at startup, overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown. These regulators are ideal solutions for point-of-load regulation, high-end consumer products, and communication applications.