ELM623FA
20A Fully Integrated Synchronous Boost Converter

ELM623FA is a high efficiency fully integrated synchronous Boost converter with built-in main switch and synchronous switch. The device has 20A switch peak current capability and provides output voltage up to 18V. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements, allowing ELM623FA to be used in high power step-up applications. The 2.7V to 18V input voltage range supports a wide range of battery and AC powered inputs. The 70µA no load quiescent current extends operating run time in battery-powered systems. The operating frequency can be externally set for a 50kHz to 1MHz range, as for operation mode is automatic PSM/PWM mode. ELM623FA implements a programmable soft-start function, an adjustable cycle by cycle switching peak current limit function and thermal shutdown protection. ELM623FA is available in a small 20 pin 4mm×4mm QFN package.

Adjustable Input UVLO
through EN pin
Resistor or Inductor DCR
current sensing
Programmable Soft-start
Cycle-by-Cycle Current Limit
Thermal Shutdown
Integrated 18V rating
9mΩ power switches with
20A peak current capability
Input Range2.7V to 18.0V
Output Voltage3.0V to 18.0V
Low Quiescent Current70µA
Low shutdown supply current 3.5µA
Adjustable Frequency50kHz to 1MHz
PackageQFN20-4x4
DatasheetELM623FA
Application
USB TypeC-PD and Thunderbolt Port for PCs
Industrial Battery Powered POS Terminals
Quick Charge Power Banks
Electronic Cigarette
Hi Power Bluetooth Speaker

Recommend operating conditions

ParameterSymbolLimitUnit
Input VoltageVin+2.7 to +18.0V
Output VoltageVout+3.0 to 18.0V
Operating temperatureTop-40 to +85°C

Absolute Maximum Ratings

ParameterSymbolLimitUnit
VH to GNDVvh-0.3 to +20.0V
ISP to GNDVisp-0.3 to +20.0V
ISN to GNDVisn-0.3 to +20.0V
OUT to GNDVout-0.3 to +20.0V
ISP to ISNVisp_isn-0.3 to +0.3V
PGND to GNDVpgnd-0.3 to +0.3V
SW to GNDVsw-1 to Vout+1V
Dynamic Vsw in 50ns duration-3 to Vout+3V
BST to SWVbst_sw-0.3 to +6.0V
EN to GNDVen-0.3 to +6.0V
FB to GNDVfb-0.3 to +6.0V
COMP to GNDVcomp-0.3 to +6.0V
VCC to GNDVcc-0.3 to +6.0V
Power dissipationPd2.0W
Storage temperature rangeTstg-55 to +150°C

Block diagram

block-diagram