R1230D Datasheet, PDF (2/20 Pages) RICOH electronics devices division – PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

s BLOCK DIAGRAM
qR1230DXX1A/B
VDD
VIN
MODE _{“L”= PWM “H”= VFM}
OSC
PWM/VFM
CONTROL
Phase Compensation
Lx
OUTPUT
CONTROL
Vref
VOUT
Current Protection
UVLO
Soft Start
CE
Chip Enable
“H” Active
CE
PGND
qR1230D001C/D
VIN
AGND
VDD
MODE “L”= PWM _{“H”= VFM}
OSC
VFB
PWM/VFM
Phase Compensation
Lx
CONTROL
OUTPUT
CONTROL
Current Protection
UVLO
Vref
Chip Enable
“H” Active
CE
Soft Start
PGND
AGND
Rev. 1.12
-2-