R1112N/R1122N Series
Low Noise 150mA LDO
No.EK-060-091101 CMOS LDO Regulator
The R1112N/R1122N Series are CMOS-based LDO regulators featuring 150mA output. High ripple rejection and excellent load
transient response of the series make the product ideally suited for use in power source for hand-held com munication equipment.
The polarity of the CE pin can be selected. Tw o different pin layout as R1112N and R1122N are available. Ceramic capacitors can be
used.
FEATURES
• Supply Current (ISS)························Typ. 100μA (VIN=SET VOUT+1V)
• Standby Current (Istandby) ·················Typ. 0.1μA (Same as above, in standby)
• Dropout Voltage (VDIF) ····················Typ. 0.19V (IOUT=100mA, VOUT=2.8V)
• Ripple Rejection (RR)·····················Typ. 80dB (f=1kHz)
• Input Voltage Range (VIN)···············2.0V to 6.0V
• Output Voltage Range (VOUT)··········1.5V to 5.0V (internally fixed)
• Output Voltage Accuracy················± 2%
• Temp. coeff. of Output Voltage ············Typ. ± 100ppm/°C
• Line Regulation····································Typ. 0.05%/V
• Fold-back Protection Circuit·················Current limit Typ. 30mA
• Package···············································SOT-23-5
• Replaceable with LP2980 or LP2985. (R1112N)
• Replaceable with TK111, TK112 or TK113. (R1122N)
• Ceramic capacitors can be used. ········2.2μF or more
BLOCK DIAGRAMS
R1112Nxx1A R1112Nxx1B
R1122Nxx1A R1122Nxx1B
(
CE pin "L" active) (CE pin "H" active)
Vref
Current Limit
V
DD
V
OUT
GNDCE
Vref
Current Limit
V
DD
V
OUT
GNDCE
SELECTION GUIDE
Package Quantity per Reel Part No.
R1112N
.
xx
.
1
.
∗
-TR-F
SOT-23-5 3,000 pcs
R1122N
.
xx
.
1
.
∗
-TR-F
.
xx
.
: Specify the output voltage within the range 1.5V (
.
15
.
) to 5.0V (
.
50
.
)
in 0.1V steps.
.
∗
: Select the polarity of the CE pin from (
.
A
.
) "L" active or (
.
B
.
) "H" active.
PACKAGE (Top View) TYPICAL CHARACTERISTIC
SOT-23-5
1 3
5 4
2
R1112N R1122N
1 VDD
2 GND
3 CE or CE
4 NC
5 VOUT
1 VOUT
2 GND
3 VDD
4 CE or CE
5 NC
R1112N301B
R1122N301 B Dropout Voltage vs. Output Current
150500 100
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
85°C
25°C
-40°C
APPLICATIONS
• Power source for hand-held communication equipment, cameras, and VCRs
• Power source for home appliances • Power source for battery-powered equipment
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