Microchip

LX7178
Demoboard LX7178

Topology: Buck
Input Voltage (min.): 3.00 V
Input Voltage (max.): 5.50 V
Output 1: 0.80 V / 5.000 A

Original publication on 2019-01-10, revision 0.1

Description

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 energy-saving “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 a fixed output voltage option of 0.8V (no voltage divider is necessary). The output voltage can also be adjusted with an external voltage divider up to 3.3V.

Characteristics

  • Constant Frequency Hysteretic Control
  • Extremely Fast Line/Load Transient Response
  • I2C for Output Adjustment (3.4Mbps)
  • 1.875MHz Switching Frequency
  • Extremely Low-RDSON MOSFETS
  • Input Voltage Rail 3.3V to 5V, Current 5A
  • 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

Products

  Order Code SPEC Product series L
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
Montageart Pins Reihen Gender Typ Verpackung C
(µF)
VR
(V (DC))
Endurance
(h)
Betriebstemperatur IRIPPLE
(mA)
RESR
(mΩ)
ILeak
(µA)
DF
(%)
P
(mm)
Ø D
(mm)
L
(mm)
Technische Artikelnummer Tol. C Bauform H
(mm)
Keramiktyp Samples
744373460022 PDF WE-LHMI SMT Power Inductor 0.22 15 44 2.1 2.8 149 SMT
61300411121 PDF WR-PHD 2.54 mm THT Pin Header 3 4 Single Pin Header Straight Bag
61300311121 PDF WR-PHD 2.54 mm THT Pin Header 3 3 Single Pin Header Straight Bag
870055674005 PDF WCAP-PTHR Aluminum Polymer Capacitors 47 35 2000 -55 °C up to +105 °C 2890 25 329 12 3.5 8 11.5 PTEE115470M035DSPA7B000
885012107005 PDF WCAP-CSGP MLCCs 6.3 V(DC) 22 6.3 15 X5R0805226M6R3DFCT10000 ±20% 0805 1.25 X5R Class II
885012107011 PDF WCAP-CSGP MLCCs 10 V(DC) 22 10 10 X5R0805226M010DFCT10000 ±20% 0805 1.25 X5R Class II
885012207022 PDF WCAP-CSGP MLCCs 10 V(DC) 1 10 5 X7R0805105K010DFCT10000 ±10% 0805 1.25 X7R Class II