LX7178 Datasheet | Microsemi

3V to 5.5V, 5A Constant Frequency Hysteretic Synchronous Buck Regulator with I2C Production Datasheet Description Features The LX7178 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 LX7178 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 LX7178 will operate from 3V to 5.5V, and is available in 0.8V fixed output voltage option (no voltage divider is necessary). The output voltage can also be adjusted with an external voltage divider up to 3.3V.  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)  Ro HS pliant Applications - High Performance HDD - Notebooks/Netbooks/Tablets/Slates Copyright © 2014 Rev. 1.1, 8/7/2014 Figure 1: Typical 5V to 0.8V application with I2C implemented Microsemi Analog Mixed Signal Group One Enterprise Aliso Viejo, CA 92656 USA, 1-800-713-4113, 949-380-6100, fax 949-215-4996 Page 1 3V to 5.5V, 5A Constant Frequency Hysteretic Synchronous Buck Regulator with I2C Production Datasheet Other Application Diagrams Figure 2: Typical 5V to 0.96V application without I2C implemented Copyright © 2014 Rev. 1.1, 8/7/2014 Figure 3: Typical 5V...