Microchip

LX7176A
Demoboard LX7176A

LX7176A 4 Amp Step Down Converter

Topology: Buck
Input Voltage (min.): 3.00 V
Input Voltage (max.): 5.50 V
Output 1: 5.50 V / 4.000 A

Original publication on 2019-01-10, revision 0.1

Description

The LX7176A is a 4A step-down regulator with integrated MOSFETs packaged in a space saving QFN12 2mm x 2mm for today’s mobile devices. It uses an ultra fast, constant frequency hysteretic control method to minimize external filter components while maintaining excellent regulation. The LX7176A reference voltage is 0.6V.The LX7176A operates from 3V to 5.5V rails and outputs 0.6V to 100% of the input voltage.Cycle-by-cycle current limiting protects against over-current conditions. Hiccup mode provides protection for heavy over-load or short-circuit faults. Thermal protection shuts down the regulator under over-temperature conditions. Over voltage conditions will immediately shut off the output to protect against permanent damage. The LX7176A automatically restarts when all fault conditions are cleared. Internal soft start circuitry limits start up inrush currents.

Characteristics

  • 0-4A Step-down Regulator
  • Operational Input Supply Voltage Range: 3V-5.5V (short durations to 6.5V.)
  • Hysteretic control offers best transient response
  • CCM switching at a constant 1.65MHz
  • Automatically switches to DCM switching under light loads to improve efficiency
  • 100% Duty Ratio Operation
  • Input under voltage and over voltage protection
  • Enable and Power Good Function
  • Internal soft-start
  • Cycle-by-Cycle Over Current Protection
  • Hiccup Mode protects against short circuit faults
  • RoHS Compliant

Products

  Order Code SPEC Product series L
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
Montageart C
(µF)
Tol. C VR
(V (DC))
Bauform H
(mm)
DF
(%)
Keramiktyp Technische Artikelnummer Endurance
(h)
Betriebstemperatur IRIPPLE
(mA)
RESR
(mΩ)
ILeak
(µA)
P
(mm)
Ø D
(mm)
L
(mm)
Samples
74437324010 PDF WE-LHMI SMT Power Inductor 1 5 9 22 27 89 SMT
885012207026 PDF WCAP-CSGP MLCCs 10 V(DC) 10 ±10% 10 0805 1.25 10 X7R Class II X7R0805106K010DFCT10000
885012107005 PDF WCAP-CSGP MLCCs 6.3 V(DC) 22 ±20% 6.3 0805 1.25 15 X5R Class II X5R0805226M6R3DFCT10000
870055674005 PDF WCAP-PTHR Aluminum Polymer Capacitors 47 35 12 PTEE115470M035DSPA7B000 2000 -55 °C up to +105 °C 2890 25 329 3.5 8 11.5