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