Microchip LX7178 Handleiding

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Copyright © 2014 Microsemi Page1

Rev. 1.1, 8/7/2014 Analog Mixed Signal Group

One Enterprise Aliso Viejo, CA 92656 USA, 1-800-713-4113, 949-380-6100, fax 949-215-4996

LX7178

3V to 5.5V, 5A Constant Frequency Hysteretic

Synchronous Buck Regulator with I

2

C

Production Datasheet

Description

The LX7178 is a digitally controlled step-down regulator

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

MOSFET and a 14mΩlow-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 energy-

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

loads, to extend battery life in mobile applications.

The LX7178 has an I

2

C 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.

Features



Constant Frequency Hysteretic Control



Extremely Fast Line/Load Transient Response



I

2

C for Output Adjustment (3.4Mbps)



1.875 MHz Switching Frequency



Extremely Low-R

DSON

MOSFETS



Input Voltage Rail 3.3V to 5V



Greater than 5A Output Current



I

2

C 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

Figure 1: Typical 5V to 0.8V application with I

2

C implemented

Product specificaties