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
| Merk: | Microchip |
| Categorie: | Niet gecategoriseerd |
| Model: | LX7178 |
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