ADP3421J

Product Summary

The ADP3421J is a hysteretic dc-dc buck converter controller with two auxiliary linear regulator controllers. The ADP3421J provides a total power conversion control solution for a microprocessor by delivering the core, I/O, and clock voltages. The optimized low-voltage design is powered from the 3.3 V system supply and draws only 10μA maximum in shutdown. The main output voltage is set by a 5-bit VID code. To accommodate the transition time required by the newest processors for on-the fly VID changes, the ADP3421J features high-speed operation to allow a minimized inductor size that results in the fastest change of current to the output. To further allow for the minimum number of output capacitors to be used, theADP3421J features active voltage positioning that can be optimally compensated to ensure a superior load transient response. The main output signal interfaces with the ADP3410 dual MOSFET driver, which is optimized for high speed and high efficiency for driving both the upper and lower (synchronous) MOSFETs of the buck converter. The applications of the ADP3421J include Geyserville-Enabled Core DC-DC Converters, Fixed Voltage Mobile CPU Core DC-DC Converters, Notebook/Laptop Power Supplies, and Programmable Output Power Supplies.

Parametrics

ADP3421J absolute maximum ratings: (1)Input Supply Voltage (VCC):–0.3 V to +7 V; (2)UVLO Input Voltage:–0.3 V to +7 V; (3)All Other Inputs/Outputs: VCC + 0.3 V; (4)Operating Ambient Temperature Range: 0℃ to 100℃; (5)Junction Temperature Range: 0℃ to 150℃; (6)θJA: 98℃/W; (7)Storage Temperature Range:–65℃ to +150℃; (8)Lead Temperature (Soldering, 10 sec.): 300℃.

Features

ADP3421J features: (1)Meets Intel Mobile Voltage Positioning Requirements; (2)Lowest Processor Dissipation for Longest Battery Life; (3)Best Transient Containment; (4)Minimum Number of Output Capacitors; (5)System Power Management Compliant; (6)Fast, Smooth Output Transition During VID Code Change; (7)Programmable Current Limit; (8)Power Good; (9)Integrated LDO Controllers for Clock and I/O Supplies; (10)Programmable UVLO; (11)Soft Start with Restart Lock-In.

Diagrams