RN5RF Series
10V Input LDO with External Tr.
The RN5RF Series are CMOS-based LDO regulators with external power transistor. By using an external PNP transistor, a low
dropout voltage regulator ranging from several tens of mA to several hundreds mA can be configured. (Use a low saturation type PNP
transistor with h
FE
of approximately 100 to 300.)
FEATURES
•
Supply Current (I
SS
) ························ Typ. 30μA (V
IN
=V
SET
+1.0V)
•
Standby Current (I
standby
) ················· Typ. 0.1μA (V
IN
=10.0V, In standby)
•
Dropout Voltage (V
DIF
) ···················· Typ. 0.1V
∗
(I
OUT
=100mA, V
SET
=2.8V)
•
Ripple Rejection (RR)····················· Typ. 60dB
∗
(f=1kHz, V
SET
≥
1.6V)
•
•
Typ. 50dB
∗
(f=1kHz, V
SET
≤
1.5V)
Input Voltage Range (V
IN
) ··············· 1.8V to 10.0V
Output Voltage Range (V
OUT
)·········· 1.2V to 6.0V (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. 8mA
•
(Base current limit of PNP Tr.)
Package ········································· SOT-23-5
∗
) The value depends on the capacity of the external PNP transistor.
BLOCK DIAGRAMS
RN5RFxxA
(
CE
pin "L" active)
4
V
DD
2
-
+
Vref
CE
5
Vref
RN5RFxxB
(CE pin "H" active)
EXT
V
OUT
V
DD
2
-
+
4
EXT
V
OUT
3
3
Current Limit
Current Limit
1
GND
CE
5
1
GND
SELECTION GUIDE
Halogen Free
Package
SOT-23-5
Q'ty per Reel
Part No.
3,000 pcs RN5RF
.xx∗
A-TR-FE
TYPICAL APPLICATION
PNP Tr
EXT
4
.xx.
: Specify the output voltage within the range of
1.2V (.12.) to 6.0V (.60.) in 0.1V steps.
.
∗
.
: Select the polarity of the CE pin from (.A.) "L" active or (.B.) "H" active.
IN
+
C1
V
DD
2
RN5RFxxA
V
OUT
3
+
C2
OUT
CE
5
1
GND
C1, C2 : Tantalum capacitor of 10μF
PNP transistor : 2SB766A
PACKAGE (Top View)
SOT-23-5
5
4
TYPICAL CHARACTERISTIC
RN5RF30A Dropout Voltage vs. Output Current
0.5
85°C
25°C
-40°C
Dropout Voltage V
DIF
(V)
0.4
0.3
0.2
0.1
0
1
2
3
1
2
3
4
5
GND
V
DD
V
OUT
EXT
CE
or CE
0
100
200
300
400
500
Output Current I
OUT
(mA)
APPLICATIONS
•
Power source for hand-held communication equipment, cameras, and VCRs
•
Power source for home appliances
No.EK-043-121001
•
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.
3. Please be sure to take any necessary formalities under relevant laws or regulations before
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.
6. We are making our continuous effort to improve the quality and reliability of our products, but
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.
Halogen Free
For the conservation of the global environment, Ricoh is advancing the decrease of the negative environmental impact material.
After Apr. 1, 2006, we will ship out the lead free products only. Thus, all products that will be shipped from now on comply with RoHS Directive.
Basically after Apr. 1, 2012, we will ship out the Power Management ICs of the Halogen Free products only. (Ricoh Halogen Free products are
also Antimony Free.)
RICOH COMPANY, LTD.
Electronic Devices Company
http://www.ricoh.com/LSI/
RICOH COMPANY, LTD.
Electronic Devices Company
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