RP173x Series
Low Supply Current 150mA 11V Input LDO with Reverse Current Protection
The RP173x Series are CMOS-based LDO regulators featuring 150mA output and low supply current of Typ. 2.0μA. RP173x Series are
suitable for the power source such as the equipment being in the standby-mode. A version with
CE
input pin has reduced CE pull-up
∗
resistor to make its supply current ultra low. The RP173x Series have Max.11V Input voltage and are applicable to the portable
communication equipment that require the 2-cell Li-ion battery. Also they are applicable to the non-portable communication
equipments. As this series includes Reverse Current Protection Circuit, there is little leakage current, if it's used as back-up circuit.
SOT-23-5 and SC-88A packages, a 1mm square DFN(PLP)1010-4 package are available. Ceramic capacitors can be used.
∗)
Please check the condition
FEATURES
•
Supply Current (I
ss
)························· Typ. 2μA (V
IN
=V
SET
+1.0V)
•
Standby Current (I
standby
) ················· Typ. 0.2μA (V
IN
=V
SET
+6.5V, In standby)
•
Dropout Voltage (V
DIF
) ···················· Typ. 0.9V (I
OUT
=150mA, V
SET
=2.8V)
•
Input Voltage Range (V
IN
) ··············· 2.5V to V
SET
+6.5V (Max.11.0V)
•
Output Voltage Range (V
OUT
)·········· 1.2V to 5.5V (Internally fixed)
•
Output Voltage Accuracy ················± 1%
•
Temp. coeff. of Output Voltage ······· Typ.
±
100ppm/°C
•
Line Regulation·······························Typ. 0.02%/V
•
Fold-back Protection Circuit············Current limit Typ. 45mA
•
Reverse Current Protection Circuit ······Reverse Current Max.0.16μA
•
Auto-discharge Function·················D Version
•
Packages ········································DFN(PLP)1010-4,
•
Ceramic capacitors can be used. ···0.1μF or more
SC-88A, SOT-23-5
(The above shows specification at Topt=25
°
C. Design assurance value at -40
°
C
≤
Topt
≤
85
°
C is also available. For details, please refer to the datasheet.)
BLOCK DIAGRAMS
RP173xxxxA
(
CE
pin "L" active)
V
DD
V
OUT
V
DD
RP173xxxxB
(CE pin "H" active)
V
OUT
V
DD
RP173xxxxD
(With Auto-discharge function)
V
OUT
Vref
Current Limit
Reverse
Detector
Vref
Current Limit
Reverse
Detector
Vref
Current Limit
Reverse
Detector
CE
GND
CE
GND
CE
GND
Pull-up resistance is not built-in
SELECTION GUIDES
Halogen Free
Package
DFN(PLP)1010-4
SC-88A
SOT-23-5
Q'ty per Reel
Part No.
10,000 pcs RP173K.xx.1.
∗
.-TR
3,000 pcs RP173Q.xx.2.
∗
.-TR-FE
3,000 pcs RP173N.xx.1.
∗
.-TR-FE
.xx.
: Specify the output voltage within the range of 1.2V (.12.) to 5.5V (.55.)
in 0.1V steps.
.
∗
.
: Select the polarity of the CE pin from (.A.) "L" active,
(.B.) "H" active, or (.D.) "H" active with auto-discharge function.
PACKAGES (Top View)
DFN(PLP)1010-4
4
3
TYPICAL CHARACTERISTIC
SOT-23-5
5
4
SC-88A
5
4
RP173x30xx
800
Dropout Voltage V
DIF
(mV)
Dropout Voltage vs. Output Current
85°C
25°C
-40°C
∗
700
600
500
400
300
200
100
0
0
1
2
1
2
3
1
2
3
1
2
3
4
V
OUT
GND
CE
or CE
V
DD
1
2
3
4
5
CE
or CE
NC
GND
V
OUT
V
DD
1
2
3
4
5
V
DD
GND
CE
or CE
NC
V
OUT
∗
) The tab is substrate level (GND).
25
50
75
100 125
Output Current I
OUT
(mA)
150
APPLICATIONS
•
Power source for hand-held communication equipment, cameras, and VCRs
•
Power source for home appliances
•
Power source for battery-powered equipment
No.EK-256-121001
CMOS LDO Regulator
RP173x Series
Reverse Current Protection Circuit
The Reverse Current Protection Circuit stops the reverse current
from V
OUT
pin to V
DD
pin or to GND pin when V
OUT
becomes
higher than V
IN
.
Usually, the LDO using Pch output transistor contains a parasitic
diode between V
DD
pin and V
OUT
pin. Therefore, if V
OUT
is higher
than V
IN
, the parasitic diode conducts in forward direction. As a
result, the current flows from V
OUT
pin to V
DD
pin.
RP173x Series switches to the reverse current protection mode
before V
IN
becomes lower than V
OUT
by connecting the parasitic
diode of Pch output transistor to the backward direction, and
connecting the gate to V
OUT
pin.
As a result, the Pch output transistor is turned off and the current
path from V
OUT
pin to GND pin is disconnected. (Except RP115x)
CMOS LDO Regulator
Low Supply Current 150mA 11V Input LDO with Reverse Current Protection
ECO
V
DD
V
OUT
Vref
Current Limit
CE
∗
Reverse Detector
GND
indicates a parasitic diode.
When using a backup circuit. In case of using LDO that doesn't have a Reverse Current Protection Circuit as shown in the left
figure, a protection schottky diode is required with the LDO. Please note that a schottky diode causes a dropout of about 0.3V and
leakage current of a few
μA
to 50μA.
When using an LDO including the Reverse Current Protection Circuit such as RP173x, the protection diode is not needed as
shown in the right figure. Therefore, it can prevent the voltage drop and the leakage current.
Parasitic diode
V
DD
Main
Power
Supply
Regulator
V
OUT
Protection diode
Vf
RTC
Memory
etc.
V
DD
Main
Power
Supply
RP173x
V
OUT
Vf
RTC
Memory
etc.
GND
Leakage
Back-up
current
Power
Supply
GND
GND
Leakage
current Back-up
Power
Supply
GND
Products with Reverse Current Protection Circuit
R1155x
∗
R1163x
R1191x
RP108x
RP115x
RP173x
∗)
Under Development
The currently available information as of October 2012 is provided in this New Product News.
EK-256-121001
