R1154N001C Datasheet, PDF (16/23 Pages) RICOH electronics devices division – 150mA Voltage Regulator (Wide Input Voltage Range)

R1154x
TECHNICAL NOTES
Phase Compensation
Phase Compensation of the R1154x Series has been made internally for stable operation even though the
load current would vary. Therefore, without the capacitors, CIN and COUT, the output voltage is regulated, however,
for more stable operation, use capacitors as CIN and COUT. Especially, if the input line is long and impedance is
high, CIN is necessary, moreover, if you use COUT, transient response will be improved. Recommended value is in
the range from 0.1µF to 2.2µF. Wiring should be made as short as possible.
Connect the capacitor, CIN between VDD pin and GND pin and COUT between VOUT and GND as close as
possible.
VDD
VIN CIN
R1154xxxxB
SERIES
CE
VOUT
GND
IOUT
COUT
VDD
VIN CIN
R1154x001C
SERIES
CE
ADJ
GND
VOUT
R1
R2
IOUT
COUT
R1154xxxxB Typical Application
R1154xxxxC Typical Application
Thermal Shutdown
Thermal shutdown function is included in the R1154x Series, if the junction temperature is equal or more than
+150°C(Typ.), the operation of regulator would stop. After that, when the junction temperature is equal or less
than +125°C(Typ.), the operation of regulator would restart. Unless the cause of rising temperature would
remove, the regulator repeats on and off, and output waveform would be like consecutive pulses.
Chip Enable Circuit
Do not make voltage level of chip enable pin keep floating level, or in between VIH and VIL. Unless otherwise,
Output voltage would be unstable or indefinite, or unexpected current would flow internally.
* Technical Notes on Output Voltage Setting of C type
Figure 1. Adjustable Regulator (C type)
RIC
GND
VOUT
R1 I1
ADJ
IIC
VOUT
R2
I2
2.5V
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