R1150H_17 Datasheet, PDF (28/30 Pages) RICOH electronics devices division – VOLTAGE REGULATOR (with Wide Input Voltage Range) with RESET

R1150H
TYPICAL APPLICATIONS
VIN CIN
5 VDD
VDET 4
R1150HxxxA
SERIES
3 _{CE GND} VOUT 1
2
470kΩ
IOUT
COUT
VIN2 VIN1 CIN
5 VDD
VDET 4
470kΩ
R1150HxxxB
SERIES
3 SENSE
VOUT 1
GND
2
IOUT
COUT
R1150HxxxA
CD VIN CIN
5 VDD
VDET 4
R1150HxxxC/D
SERIES
3 CD
VOUT 1
GND
2
470kΩ
IOUT
COUT
CIN=0.1μF, COUT=1μF
R1150HxxxB
CIN=0.1μF, COUT=1μF
R1150HxxxC
TECHNICAL NOTES
Phase Compensation
Phase Compensation of the R1150H Series has been made internally for stable operation even though the
load current would vary. Therefore, without the capacitors, CIN and COUT, Output Voltage is regulated, but for
more stable operation, use 0.1µF or more capacitors as CIN and COUT. Wiring should be made as short as
possible.
PCB layout
Current flows into wiring for VDD or GND, thus, if the impedance of the wiring is rather high, it may cause of
making noise or unstable operation, thus width and pattern should be enough wide to avoid such problems.
Connect the capacitor, CIN between VDD pin and GND pin as close as possible.
About the output voltage and the detector threshold setting (In case of R1150HxxxD)
When the value difference between release voltage of voltage detector and the output voltage of voltage
regulator is little, the release function may not operate after detective, due to change the output voltage of
voltage detector. Pay attention for setting of the release voltage.
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