Description

The LX7165 is a digitally controlled step‐down regulator

IC with an integrated 40mΩ high‐side P‐channel

MOSFET and a 14mΩ low‐side N‐channel MOSFET. It

features Microsemi’s proprietary constant‐frequency

hysteretic control engine for near‐instantaneous

correction to line/load transients. It does not require

high‐ESR output capacitors and incorporates energysaving

“PSM” (Power Save or Pulse Skip Mode) at light

loads, to extend battery life in mobile applications.

The LX7165 has an I2C serial interface port for output

voltage margining and monitoring if required (it can

also operate in default mode). In addition it includes

robust fault monitoring functions.

The LX7165 will operate from 3V to 5.5V, and is readily

available in 4 fixed output voltage options: 0.8, 0.9V,

0.95V, and 0.97V (no voltage divider is necessary). After

start up, the reference voltage can be adjusted with I2C

with a resolution 4.7mV between 0.6V and 1.2V. The

output voltage can also be adjusted with an external

voltage divider up to 3.3V.

Features

? Constant Frequency Hysteretic Control

? Extremely Fast Line/Load Transient Response

? I2C for Output Adjustment (3.4Mbps)

? 1.875 MHz Switching Frequency

? Extremely Low‐RDSON MOSFETS

? Input Voltage Rail 3.3V to 5V

? Greater than 5A Output Current

? I2C Selectable Power Save Mode for Light‐Load

Efficiency

? UVLO, OVP, OCP

? 0°C to +85°C Ambient Temperature

? Available in WLCSP‐20 (0.4mm pitch)

? RoHS Compliant

Applications

? High Performance HDD

? Notebooks/Netbooks/Tablets/Slates