RN5RF Series
LDO with External Tr.
No.EK-072-091101 CMOS LDO Regulator
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 hFE of approximately 100 to 300.)
FEATURES
• Supply Current (ISS)························Typ. 30μA (VIN=SET VOUT+1V)
• Standby Current (Istandby) ·················Typ. 0.1μA (VIN=10V, In standby)
• Dropout Voltage (VDIF) ····················Typ. 0.1V ∗ (IOUT=100mA, VOUT=2.8V)
• Ripple Rejection (RR)·····················Typ. 60dB ∗ (f=1kHz, VOUT
>
=
1.6V)
Typ. 50dB ∗ (f=1kHz, VOUT
<
=
1.5V)
• Input Voltage Range (VIN)···············1.8V to 10.0V
• Output Voltage Range (VOUT)··········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 RN5RFxxB
(
CE pin "L" active) (CE pin "H" active)
2
51
VOUT
GND
VDD
CE
Vref
3
Current Limit
+
-
4EXT
2
51
V
OUT
GND
V
DD
CE
Vref
3
Current Limit
+
-
4EXT
SELECTION GUIDE TYPICAL APPLICATION
Package Quantity per Reel Part No.
SOT-23-5 3,000 pcs RN5RF
.
xx∗
A-TR-F
.
xx
.
: Specify the output voltage within the range
1.2V (
.
12
.
) to 6.0V (
.
60
.
)
in 0.1V steps.
.
∗
.
:
Select the polarity of t he CE pin from (
.
A
.
) "L" active or (
.
B
.
) "H" active.
PNP Tr
EXT
OUT
C2
+
GND
CE
V
DD
IN
RN5RFxxA
V
OUT
C1
+
4
3
15
2
C1, C2 : Tantalum capacitor of 10μF
PNP transistor : 2SB766A
PACKAGE (Top View) TYPICAL CHARACTERISTIC
SOT-23-5
1 3
5 4
2
1 GND
2 VDD
3 VOUT
4 EXT
5 CE or CE
RN5RF30A Dropout Voltage vs. Output Current
85°C
25°C
-40°C
Output Current IOUT(mA)
Dropout Voltage V
DIF
(V)
3000 100 200 400 500
0.5
0.2
0.4
0.3
0.1
0
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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