R1121N_17 Datasheet, PDF (6/18 Pages) RICOH electronics devices division – LOW NOISE 150mA LDO REGULATOR

R1121N
ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE
Output Voltage
VOUT (V)
1.5 ^<= VOUT ^<= 1.7
1.8 ^<= VOUT ^<= 5.0
Output Current
IOUT (mA)
Condition
VIN - VOUT = 1.0V
Topt = 25°C
Min.
100
150
Output Voltage
VOUT (V)
1.5
1.6
1.7
1.8 ^<= VOUT ^<= 1.9
2.0 ^<= VOUT ^<= 2.4
2.5 ^<= VOUT ^<= 2.7
2.8 ^<= VOUT ^<= 3.3
3.4 ^<= VOUT ^<= 5.0
Condition
Dropout Voltage
VDIF (V)
Min.
0.50
0.40
0.30
IOUT = 100mA
Topt = 25°C
Typ.
Max.
0.60
1.40
0.35
0.70
0.24
0.35
0.20
0.30
0.17
0.26
Note : When set Output Voltage is equal or less than 2.0V,
VIN should be equal or more than 2.0V.
OPERATION
R1121Nxx1A
R1121Nxx1B
1
VDD
5
VOUT
1
VDD
5
VOUT
R1
R1
Vref
Vref
CE
Current Limit
R2 _GND
CE
Current Limit
R2 _GND
3
2
3
2
In these ICs, fluctuation of output voltage, VOUT is detected by feed-back registers R1, R2, and the result is
compared with a reference voltage by the error amplifier, so that a constant voltage is output.
A current limit circuit for protection in short mode and a chip enable circuit, are included.
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