RN5RF Series
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 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)
• 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
• Ripple Rejection (RR)·····················Typ. 60dB ∗ (f=1kHz, VOUT 1.6V)
>
=
∗
<
Typ. 50dB (f=1kHz, VOUT 1.5V)
(Base current limit of PNP Tr.)
=
• Input Voltage Range (VIN)···············1.8V to 10.0V
• Output Voltage Range (VOUT)··········1.2V to 6.0V (internally fixed)
• Package ········································· SOT-23-5
) The value depends on the capacity of the external PNP transistor.
∗
BLOCK DIAGRAMS
RN5RFxxA
RN5RFxxB
(CE pin "H" active)
(
pin "L" active)
CE
EXT
EXT
4
4
VDD
2
VOUT
V
DD
2
VOUT
3
3
-
-
+
+
Vref
Vref
Current Limit
Current Limit
5
5
CE
1
GND
1 GND
CE
SELECTION GUIDE
TYPICAL APPLICATION
PNP Tr
Package
Quantity per Reel
Part No.
EXT
4
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
.
)
V
DD
VOUT
in 0.1V steps.
IN
2
RN5RFxxA
OUT
3
.
.
:
Select the polarity of the CE pin from (
.
A
.
) "L" active or (
.
B
.
) "H" active.
∗
+
+
C1
C2
5
1
CE
GND
C1, C2 : Tantalum capacitor of 10μF
PNP transistor : 2SB766A
PACKAGE (Top View)
TYPICAL CHARACTERISTIC
RN5RF30A Dropout Voltage vs. Output Current
SOT-23-5
5
4
0.5
85°C
25°C
-40°C
0.4
0.3
1
2
3
0.2
0.1
0
1
2
3
4
5
GND
VDD
VOUT
EXT
0
100
200
300
400
500
Output Current IOUT(mA)
CE or CE
APPLICATIONS
• Power source for hand-held communication equipment, cameras, and VCRs • Power source for battery-powered equipment
• Power source for home appliances
No.EK-072-091101
CMOS LDO Regulator