Tiny 1.2A Synchronous Buck Regulator with Programmable Soft Start

Topology: Buck
Input Voltage (min.): 2.30 V
Input Voltage (max.): 5.50 V
Output 1: 3.30 V / 1.200 A

Original publication on 2017-10-09, revision 1.0


The SC21154 is an ultra high efficiency 1.2A DC/DC buckregulator available in a small MLPD package. These featuresmake the SC21154 perfect for small form factor consumerapplications where high efficiency is essential.SC21154 is an Adaptive On-Time 4MHz switching regulatorat full load conditions.


  • FeaturesInput voltage range — 2.3V to 5.5V1.2A continuous output current4MHz switching frequencyAdjustable Output Voltage1% output voltage accuracyAdaptive On-Time architectureUp to 100% duty cycleUp to 96% peak efficiencyPower Save mode for efficient light load operation>90% efficiency 30mA to 75mA0.1μA shutdown current21μA quiescent currentProgrammable soft startPre-bias startup protection1.5mm x 2mm, 6-Lead MLPD packageWEEE and RoHS compliant and halogen-free


  Order Code SPEC Product series L
IR 1
IR 2
Typ H
74479876147 PDF WE-PMI Power Multilayer Inductor 0.47 1500 2100 2000 40 120 Low RDC & High Saturation Current 1

Other applications and Würth Elektronik products for this IC

  • SC21154
    Topology: Buck, Input Voltage (min.): 2.30 V, Input Voltage (max.): 5.50 V, Output 1: 3.30 V / 1.200 A