R1112N/R1122N Series
Low Noise 150mA LDO
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 communication equipment.
The polarity of the CE pin can be selected. Two different pin layout as R1112N and R1122N are available. Ceramic capacitors can be
used.
FEATURES
•
Supply Current (I
SS
) ························Typ. 100μA (V
IN
=SET V
OUT
+1V)
•
Standby Current (I
standby
) ·················Typ. 0.1μA (Same as above, in standby)
•
Dropout Voltage (V
DIF
) ····················Typ. 0.19V (I
OUT
=100mA, V
OUT
=2.8V)
•
Ripple Rejection (RR)·····················Typ. 80dB (f=1kHz)
•
Input Voltage Range (V
IN
) ···············2.0V to 6.0V
•
Output Voltage Range (V
OUT
)··········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
R1122Nxx1A
(
CE
pin "L" active)
R1112Nxx1B
R1122Nxx1B
(CE pin "H" active)
V
DD
V
OUT
V
DD
V
OUT
Vref
Current Limit
CE
GND
Vref
Current Limit
CE
GND
SELECTION GUIDE
Package
SOT-23-5
Quantity per Reel
3,000 pcs
Part No.
R1112N.xx.1.
∗
-TR-F
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)
SOT-23-5
5
4
TYPICAL CHARACTERISTIC
R1112N301B
R1122N301B
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
Dropout Voltage vs. Output Current
85°C
25°C
-40°C
1
2
3
R1112N
1
2
3
4
5
V
DD
GND
CE
or CE
NC
V
OUT
R1122N
1
2
3
4
5
V
OUT
GND
V
DD
CE or CE
NC
Dropout Voltage V
DIF
(V)
0
50
100
Output Current I
OUT
(mA)
150
APPLICATIONS
•
Power source for hand-held communication equipment, cameras, and VCRs
•
Power source for home appliances
No.EK-060-091101
•
Power source for battery-powered equipment
CMOS LDO Regulator
1. The products and the product specifications described in this document are subject to change or
discontinuation of production without notice for reasons such as improvement. Therefore, before
deciding to use the products, please refer to Ricoh sales representatives for the latest
information thereon.
2. The materials in this document may not be copied or otherwise reproduced in whole or in part
without prior written consent of Ricoh.
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exporting or otherwise taking out of your country the products or the technical information
described herein.
4. The technical information described in this document shows typical characteristics of and
example application circuits for the products. The release of such information is not to be
construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual
property rights or any other rights.
5. The products listed in this document are intended and designed for use as general electronic
components in standard applications (office equipment, telecommunication equipment,
measuring instruments, consumer electronic products, amusement equipment etc.). Those
customers intending to use a product in an application requiring extreme quality and reliability,
for example, in a highly specific application where the failure or misoperation of the product
could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system,
traffic control system, automotive and transportation equipment, combustion equipment, safety
devices, life support system etc.) should first contact us.
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semiconductor products are likely to fail with certain probability. In order to prevent any injury to
persons or damages to property resulting from such failure, customers should be careful enough
to incorporate safety measures in their design, such as redundancy feature, firecontainment
feature and fail-safe feature. We do not assume any liability or responsibility for any loss or
damage arising from misuse or inappropriate use of the products.
7. Anti-radiation design is not implemented in the products described in this document.
8. Please contact Ricoh sales representatives should you have any questions or comments
concerning the products or the technical information.
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Electronic Devices Company
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