R1152N Datasheet, PDF (17/21 Pages) RICOH electronics devices division – High Input Voltage Tolerant Boost Voltage Regulator

R1152N
• Adjustable Resister vs. Output Voltage (Topt=25°C)
R1125N025B
R3=10kΩ
Topt=25°C
30
30
24
24
18
18
12
12
6
6
0
0
0
20 40 60 80 100
0
Resistance R2(kΩ)
R1125N025B
R3=100kΩ
Topt=25°C
200 400 600 800 1000
Resistance R2(kΩ)
For Stable Operation
Phase Compensation
In these ICs, phase compensation is externally made for securing stable operation even if the load current is
varied. For this purpose, be sure to use a capacitor for the output pin with good frequency characteristics and
ESR (Equivalent Series Resistance) of which is in the range described as follows:
IN
CIN
Ceramic
Capacitor
0.1µF
VIN
EXT
CE
VOUT
GND
PNP Tr
Ceramic
Capacitor
10µF
ESR
COUT
IOUT
OUT
S.A
Spectrum
Analyze
Measuring Circuit for white noise; R1152NxxxB
The relations between IOUT (Output Current) and ESR of Output Capacitor are shown below. The conditions
when the white noise level is under 40µV (Avg.) are marked as the hatched area in the graph.
<Measurement conditions>
(1)VIN=VOUT+1V
(2)Frequency band: 10Hz to 1MHz
(3)Temperature: 25°C
(4)COUT: Ceramic 10µF; ESR=0.075Ω(10kHz)
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