LOW DROPOUT AND LOW NOISE
VOLTAGE REGULATOR
1
OUTLINE
The Rx5RZ Series are CMOS-based voltage regulator ICs with high output voltage accuracy, low supply current,
low dropout voltage and high ripple rejection. Each of these voltage regulator ICs consists of a voltage reference
unit, an error amplifier, output voltage setting resistors, a current limit circuit and a chip enable circuit. (Provided
two types of chip enable circuit ; "H" active and "L" active, that can be selected when order.)for A/B version
The output voltage of these ICs is fixed with high accuracy.
In addition to low supply current from CMOS process, the Rx5RZ Series may lengthen battery life through low
dropout voltage and chip enable function thanks to the built-in low ON resistance transistor. Also when compared
with conventional regulators that employ CMOS process, these ICs have superior ripple rejection, input transient
response characteristic and load transient response characteristic thus making these product suitable for power sup-
ply for hand-held communication equipment.
Since the package for these ICs are the SOT-23-5 package and SOT89, high density mounting of the ICs on
boards is possible.
Ultra-Low Supply Current...........................................Typ. 20A
Ultra-Low Supply Current (Standby).........................Typ. 0.1A (for A/B version)
High Accuracy Output Voltage ..................................2.0%
High Ripple Rejection .................................................Typ. 55dB (f=1kHz)
Low Dropout Voltage ..................................................Typ. 0.2V (I
OUT
=60mA)
Low Temperature-Drift Coefficient of Output Voltage........Typ. 100ppm/C
Excellent Line Regulation...........................................Typ. 0.05%/V
Output Voltage .............................................................Stepwise setting with a step of 0.1V in the range of 2.0V to 6.0V
is possible (refer to Selection Guide).
Built-in Short Current Limit Circuit...........................Typ. 50mA
Small Package ..............................................................SOT-23-5 (Mini-mold), SOT89
FEATURES
APPLICATIONS
Power source for battery-powered equipment.
Power source for cellular phones, cameras, VCRs, camcorders, hand-held audio instruments and hand-held com-
munication equipment.
Power source for domestic appliances.
Rx5RZ SERIES
NO. EA-039-0204
SELECTION GUIDE
2
Rx5RZ
BLOCK DIAGRAMS
2
5
1
V
OUT
GND
V
DD
CE
Vref
3
Current Limit
2
5
1
V
OUT
GND
V
DD
CE
+
Vref
3
Current Limit
+
RN5RZxxA
RN5RZxxB
2
1
V
OUT
GND
V
DD
Vref
3
Current Limit
+
RH5RZxxC
Rx5RZ xxxx
xx
Part Number
a
b cd e
}
The output voltage, the active type of the chip enable circuit, the packing type, and the taping type for the ICs
can be selected at the user's request.
These selections can be made by designating the part number as shown below:
Code
Contents
Package type:
a
N : SOT23-5
H : SOT89
b
Setting Output Voltage (V
OUT
) :
Stepwise setting with a step of 0.1V in the range of 2.0V to 6.0V is possible.
Designation of Active Type of The Chip Enable Circuit :
c
A : "L" active type
B : "H" active type
C : no CE pin
Designation of Packing Type :
d
A : Taping
C : Antistatic bag (for Samples only)
e
Designation of Taping Type :
Ex. TR, TL (refer to Taping Specifications ; TR type is the standard direction.)
}
For example, the product with Output Voltage of 5.0V, Specified Polarity of Chip Enable is "H" active and Taping
Type TR is designated by Part Number RN5RZ50BA-TR.
3
Rx5RZ
PIN CONFIGURATION
PIN DESCRIPTION
SOT-23-5
1
2
3
5
4
(mark side)
Pin No.
Symbol
Description
1
GND
Ground Pin
2
V
DD
Input Pin
3
V
OUT
Output Pin
4
NC
No Connection
5
CE or CE
Chip Enable Pin
ABSOLUTE MAXIMUM RATINGS
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under
any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation
above these absolute maximum ratings may cause degradation or permanent damage to the device. These
are stress ratings only and do not necessarily imply functional operation below these limits.
Symbol
Item
Ratings
Unit
V
IN
Input Voltage
9
V
V
CE
Input Voltage (CE or CE Pin)
0.3 to V
IN
+0.3
V
V
OUT
Output Voltage
0.3 to V
IN
+0.3
V
I
OUT
Output Current
200
mA
P
D
Power Dissipation
250 (SOT23-5)
mW
500 (SOT89)
Topt
Operating Temperature
40 to +85
C
Tstg
Storage Temperature
55 to +125
C
SOT89
1
2
3
(mark side)
4
Rx5RZ
ELECTRICAL CHARACTERISTICS
RN5RZxxA Series
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
V
OUT
Output Voltage
V
IN
=V
OUT
+1V, I
OUT
=30mA
0.98
1.02
V
I
OUT
Output Current
V
IN
=V
OUT
+1V
100
mA
When V
OUT
=V
OUT
0.1V
V
OUT
Load Regulation
V
IN
=V
OUT
+1V
20
40
mV
I
OUT
1mA
I
OUT
80mA
V
DIF
Dropout Voltage
I
OUT
=60mA
0.2
0.3
V
I
SS
Supply Current
V
IN
=V
OUT
+1V
20
40
A
Istandby
Supply Current (Standby)
V
IN
=V
CE
=V
OUT
+1V
0.1
1.0
A
V
OUT
Line Regulation
I
OUT
=30mA
0.05
0.20
%/V
V
IN
V
OUT
+0.5V
V
IN
8.0V
RR
Ripple Rejection
f=1kHz, Ripple 0.5Vrms
55
dB
V
IN
=V
OUT
+1V
V
IN
Input Voltage
8
V
V
OUT
Output Voltage
I
OUT
=30mA
100
ppm/C
Topt
Temperature Coefficient
40C
Topt85C
I
lim
Short Current Limit
V
OUT
=0V
50
mA
R
PU
CE Pull-up Resistance
2.5
5.0
10.0
M
V
CEH
CE Input Voltage "H"
1.5
V
V
CEL
CE Input Voltage "L"
0.00
0.25
V
Topt=25C
5
Rx5RZ
RN5RZxxB Series
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
V
OUT
Output Voltage
V
IN
=V
OUT
+1V, I
OUT
=30mA
0.98
1.02
V
I
OUT
Output Current
V
IN
=V
OUT
+1V
100
mA
When V
OUT
=V
OUT
0.1V
V
OUT
Load Regulation
V
IN
=V
OUT
+1V
20
40
mV
I
OUT
1mA
I
OUT
80mA
V
DIF
Dropout Voltage
I
OUT
=60mA
0.2
0.3
V
I
SS
Supply Current
V
IN
=V
OUT
+1V
20
40
A
Istandby
Supply Current (Standby)
V
IN
=V
OUT
+1V, V
CE
=GND
0.1
1.0
A
V
OUT
Line Regulation
I
OUT
=30mA
0.05
0.20
%/V
V
IN
V
OUT
+0.5V
V
IN
8.0V
RR
Ripple Rejection
f=1kHz, Ripple 0.5Vrms
55
dB
V
IN
=V
OUT
+1V
V
IN
Input Voltage
8
V
V
OUT
Output Voltage
I
OUT
=30mA
100
ppm/C
Topt
Temperature Coefficient
40C
Topt85C
I
lim
Short Current Limit
V
OUT
=0V
50
mA
R
PU
CE Pull-down Resistance
2.5
5.0
10.0
M
V
CEH
CE Input Voltage "H"
1.5
V
V
CEL
CE Input Voltage "L"
0.00
0.25
V
Topt=25C
RH5RZxxC Series
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
V
OUT
Output Voltage
V
IN
=V
OUT
+1V, I
OUT
=30mA
0.98
1.02
V
I
OUT
Output Current
V
IN
=V
OUT
+1V
100
mA
V
OUT
Load Regulation
V
IN
=V
OUT
+1V
20
40
mV
I
OUT
1mA
I
OUT
80mA
V
DIF
Dropout Voltage
I
OUT
=60mA
0.2
0.3
V
I
SS
Supply Current
V
IN
=V
OUT
+1V
20
40
A
V
OUT
Line Regulation
I
OUT
=30mA
0.05
0.20
%/V
V
IN
V
OUT
+0.5V
V
IN
8.0V
RR
Ripple Rejection
f=1kHz, Ripple 0.5Vrms
55
dB
V
IN
=V
OUT
+1V
V
IN
Input Voltage
8
V
V
OUT
Output Voltage
I
OUT
=30mA
100
ppm/C
Topt
Temperature Coefficient
40C
Topt85C
I
lim
Short Current Limit
V
OUT
=0V
50
mA
Topt=25C
6
Rx5RZ
OPERATION
TEST CIRCUITS
2
5
1
V
OUT
GND
V
DD
CE
Vref
3
Current Limit
R1
R2
2
5
1
V
OUT
GND
V
DD
CE
+
Vref
3
Current Limit
R1
R2
Error Amp.
Error Amp.
+
RN5RZxxA
RN5RZxxB
2
1
V
OUT
GND
V
DD
Vref
3
Current Limit
R1
R2
+
RH5RZxxC
In these ICs, the output voltage V
OUT
is detected by feed-back registers R1, R2, and the detected output voltage
is compared with a reference voltage by an error amplifier, so that a constant voltage is output.
A current limit circuit working for short protection and a chip enable circuit for standby function are included.
2
3
1
5
V
DD
V
OUT
GND
RN5RZxxB
SERIES
C1 : 1
F
C2 : 10
F
C1
V
IN
C2
I
OUT
CE
2
3
1
5
V
DD
V
OUT
RN5RZxxB
SERIES
C1 : 1
F
C2 : 10
F
C1
V
IN
C2
A
GND
CE
Fig.1 Standard Test Circuit
Fig.2 Supply Current Test Circuit
7
Rx5RZ
2
3
1
5
V
DD
V
OUT
RN5RZxxB
SERIES
C1 : 10
F
V
IN
C1
I
OUT
P.G.
GND
CE
Fig.3 Line Transient Response Test Circuit
2
3
1
5
V
DD
V
OUT
RN5RZxxB
SERIES
C1 : 1
F
C2 : 10
F
C1
V
IN
C2
l1
l2
GND
CE
Fig.4 Load Transient Response Test Circuit
2
3
1
5
V
DD
V
OUT
RN5RZxxB
SERIES
C1 : 1
F
C2 : 10
F
C1
V
IN
C2
I
OUT
GND
CE
Fig.5 Ripple Rejection Test Circuit
8
Rx5RZ
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
Rx5RZ30x
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Output Current I
OUT
(mA)
Output Voltage V
OUT
(V)
0
100
200
300
400
500
3.5V
4.0V
5.0V
V
IN
=3.3V
Rx5RZ40x
5.0
4.5
4.0
3.5
3.0
2.5
1.5
1.0
2.0
0.5
0.0
Output Current I
OUT
(mA)
Output Voltage V
OUT
(V)
0
100
200
300
400
500
4.5V
5.0V
6.0V
V
IN
=4.3V
Rx5RZ50x
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Output Current I
OUT
(mA)
Output Voltage V
OUT
(V)
0
100
200
300
400
500
6.0V
5.5V
7.0V
V
IN
=5.3V
Rx5RZ30x
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0.0
2.0
4.0
8.0
6.0
I
OUT
=0mA
I
OUT
=30mA
I
OUT
=50mA
Rx5RZ40x
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
5.0
4.0
3.0
2.0
1.0
0.0
0.0
2.0
4.0
8.0
6.0
I
OUT
=0mA
I
OUT
=30mA
I
OUT
=50mA
2) Output Voltage vs. Input Voltage
9
Rx5RZ
3) Dropout Voltage vs. Output Current
Rx5RZ50x
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0.0
2.0
4.0
6.0
8.0
I
OUT
=0mA
I
OUT
=30mA
I
OUT
=50mA
Rx5RZ30x
0.30
0.25
0.20
0.15
0.10
0.05
0.00
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
0
20
40
60
80
100
Topt=40C
Topt=25C
Topt=85C
Rx5RZ40x
0.30
0.25
0.20
0.15
0.10
0.05
0.00
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
0
20
40
60
80
100
Topt=40C
Topt=25C
Topt=85C
Rx5RZ50x
0.30
0.25
0.20
0.15
0.10
0.05
0.00
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
0
20
40
60
80
100
Topt=40C
Topt=25C
Topt=85C
0.35
10
Rx5RZ
4) Output Voltage vs. Temperature
5) Supply Current vs. Input Voltage
Rx5RZ30x
3.10
3.05
3.00
2.95
2.90
Temperature Topt(C)
Output Voltage V
OUT
(V)
50
0
50
100
Rx5RZ40x
4.10
4.05
4.00
3.95
3.90
Temperature Topt(C)
Output Voltage V
OUT
(V)
50
0
50
100
Rx5RZ50x
5.10
5.05
5.00
4.95
4.90
Temperature Topt(C)
Output Voltage V
OUT
(V)
50
0
50
100
Rx5RZ30x
30
25
20
15
10
5
0
Input Voltage V
IN
(V)
Supply Current I
SS
(
A)
0.0
2.0
4.0
8.0
6.0
Rx5RZ40x
30
25
20
15
10
5
0
Input Voltage V
IN
(V)
Supply Current I
SS
(
A)
0.0
2.0
4.0
8.0
6.0
11
Rx5RZ
6) Supply Current vs. Temperature
Rx5RZ50x
30
25
20
15
10
5
0
Input Voltage V
IN
(V)
Supply Current I
SS
(
A)
0.0
2.0
4.0
8.0
6.0
Rx5RZ30x
30
25
20
15
10
5
0
Temperature Topt(C)
Supply Current I
SS
(
A)
50
0
50
100
Rx5RZ40x
30
25
20
15
10
5
0
Temperature Topt(C)
Supply Current I
SS
(
A)
50
0
50
100
Rx5RZ50x
30
25
20
15
10
5
0
Temperature Topt(C)
Supply Current I
SS
(
A)
50
0
50
100
12
Rx5RZ
8) Ripple Rejection vs. Frequency
Rx5RZ30x
80
70
60
50
40
30
20
0
10
Frequency f(kH
Z
)
Ripple Rejection RR(dB)
0.1
1
10
100
C
OUT
=tantal 2.2
F
I
OUT
=1mA
I
OUT
=30mA
I
OUT
=50mA
7) Dropout Voltage vs. Set Output Voltage
Rx5RZxxx
0.35
0.30
0.25
0.20
0.15
0.10
0.00
0.05
Set Output Voltage Vreg(V)
Dropout Voltage V
DIF
(V)
2
3
4
6
5
Topt=25C
I
OUT
=10mA
I
OUT
=30mA
I
OUT
=50mA
I
OUT
=100mA
Rx5RZ30x
80
70
60
50
40
30
20
0
10
Frequency f(kH
Z
)
Ripple Rejection RR(dB)
0.1
1
10
100
C
OUT
=tantal 4.7
F
I
OUT
=1mA
I
OUT
=30mA
I
OUT
=50mA
Rx5RZ30x
80
70
60
50
40
30
20
0
10
Frequency f(kH
Z
)
Ripple Rejection RR(dB)
0.1
1
10
100
C
OUT
=tantal 10
F
I
OUT
=1mA
I
OUT
=30mA
I
OUT
=50mA
Rx5RZ40x
80
70
60
50
40
30
20
0
10
Frequency f(kH
Z
)
Ripple Rejection RR(dB)
0.1
1
10
100
C
OUT
=tantal 2.2
F
I
OUT
=1mA
I
OUT
=30mA
I
OUT
=50mA
13
Rx5RZ
Rx5RZ40x
80
70
60
50
40
30
20
0
10
Frequency f(kH
Z
)
Ripple Rejection RR(dB)
0.1
1
10
100
C
OUT
=tantal 4.7
F
I
OUT
=1mA
I
OUT
=30mA
I
OUT
=50mA
Rx5RZ40x
80
70
60
50
40
30
20
0
10
Frequency f(kH
Z
)
Ripple Rejection RR(dB)
0.1
1
10
100
C
OUT
=tantal 10
F
I
OUT
=1mA
I
OUT
=30mA
I
OUT
=50mA
Rx5RZ50x
80
70
60
50
40
30
20
0
10
Frequency f(kH
Z
)
Ripple Rejection RR(dB)
0.1
1
10
100
C
OUT
=tantal 2.2
F
I
OUT
=1mA
I
OUT
=30mA
I
OUT
=50mA
Rx5RZ50x
80
70
60
50
40
30
20
0
10
Frequency f(kH
Z
)
Ripple Rejection RR(dB)
0.1
1
10
100
C
OUT
=tantal 4.7
F
I
OUT
=1mA
I
OUT
=30mA
I
OUT
=50mA
Rx5RZ50x
80
70
60
50
40
30
20
0
10
Frequency f(kH
Z
)
Ripple Rejection RR(dB)
0.1
1
10
100
C
OUT
=tantal 10
F
I
OUT
=1mA
I
OUT
=30mA
I
OUT
=50mA
14
Rx5RZ
10) Line Transient Response
3.4
3.3
3.2
3.1
3.0
2.9
2.8
6
5
4
3
2
1
0
Time t(
S
)
Output Voltage V
OUT
(V)
Input Voltage V
IN
(V)
10
0
20
40
50
60
70
80
90
100
30
t
r
=t
f
=5
S
C
OUT
=Ceramic 2.2
F+ESR 1
Input Voltage
Output Voltage
9) Ripple Rejection vs. Input Voltage (DC bias)
Rx5RZ30x
70
60
50
40
30
20
0
10
Input Voltage V
IN
(V)
Ripple Rejection RR(dB)
3.1
3.2
3.3
3.5
3.4
I
OUT
=1mA
C
OUT
=tantal 10
F
f=400Hz
f=1kHz
f=10kHz
Rx5RZ30x
70
60
50
40
30
20
0
10
Input Voltage V
IN
(V)
Ripple Rejection RR(dB)
3.1
3.2
3.3
3.5
3.4
f=400Hz
f=1kHz
f=10kHz
I
OUT
=10mA
C
OUT
=tantal 10
F
Rx5RZ30x
70
60
50
40
30
20
0
10
Input Voltage V
IN
(V)
Ripple Rejection RR(dB)
3.1
3.2
3.3
3.5
3.4
I
OUT
=50mA
C
OUT
=tantal 10
F
f=400Hz
f=1kHz
f=10kHz
15
Rx5RZ
11) Load Transient Response
3.4
3.3
3.2
3.1
3.0
2.9
2.8
6
5
4
3
2
1
0
Time t(
S
)
Output Voltage V
OUT
(V)
Input Voltage V
IN
(V)
10
0
20
40
50
60
70
80
90
100
30
t
r
=t
f
=5
S
C
OUT
=Tantal 3.3
F
Input Voltage
Output Voltage
3.4
3.3
3.2
3.1
3.0
2.9
2.8
6
5
4
3
2
1
0
Time t(
S
)
Output Voltage V
OUT
(V)
Input Voltage V
IN
(V)
10
0
20
40
50
60
70
80
90
100
30
t
r
=t
f
=5
S
C
OUT
=Tantal 10
F
Input Voltage
Output Voltage
3.4
3.3
3.2
3.1
3.0
2.9
2.8
150
100
50
0
50
100
150
Time t(
S
)
Output Voltage V
OUT
(V)
Output Current I
OUT
(mA)
10
0
20
40
50
60
70
80
90
100
30
C
OUT
=Ceramic 2.2
F+1
Output Current
Output Voltage
16
Rx5RZ
3.4
3.3
3.2
3.1
3.0
2.9
2.8
150
100
50
0
50
100
150
Time t(
S
)
Output Voltage V
OUT
(V)
Output Current I
OUT
(mA)
10
0
20
40
50
60
70
80
90
100
30
C
OUT
=Tantal 2.2
F
Output Current
Output Voltage
3.4
3.3
3.2
3.1
3.0
2.9
2.8
150
100
50
0
50
100
150
Time t(
S
)
Output Voltage V
OUT
(V)
Output Current I
OUT
(mA)
10
0
20
40
50
60
70
80
90
100
30
C
OUT
=Tantal 3.3
F
Output Current
Output Voltage
3.4
3.3
3.2
3.1
3.0
2.9
2.8
150
100
50
0
50
100
150
Time t(
S
)
Output Voltage V
OUT
(V)
Output Current I
OUT
(mA)
10
0
20
40
50
60
70
80
90
100
30
C
OUT
=Tantal 10
F
Output Current
Output Voltage
17
Rx5RZ
Countermeasure for Noise
FOR STABLE OPERATION
2
3
1
5
V
IN
Ceramic
Capacitor
Spectrum
Analyzer
V
OUT
I
OUT
RN5RZxxB
SERIES
ESR
V
IN
S.A.
Ceramic capacitor
0.01
F
GND
CE
The relationship between output current (I
OUT
) and Equivalent Series Resistance (ESR) in the output capacitor is
described in the graphs below. The conditions when the noise level is under 40V (Avg.) are indicated by the
hatched area in the graph.
[Measuring conditions]
Frequency band : 0Hz to 1MHz
Temperature : 25C
Measuring circuit for white noise ; RN5RZ30B
Ceramic Capacitor 1F
100.0
10.0
1.0
0.1
0.0
Output Current I
OUT
(mA)
ESR(W)
0.0
20.0
40.0
60.0
80.0
100.0
: Noise level is under 40V
Ceramic Capacitor 2.2F
100.0
10.0
1.0
0.1
0.0
Output Current I
OUT
(mA)
ESR(W)
0.0
20.0
40.0
60.0
80.0
100.0
: Noise level is under 40V
18
Rx5RZ
Ceramic Capacitor 4.7F
100.0
10.0
1.0
0.1
0.0
Output Current I
OUT
(mA)
ESR(W)
0.0
20.0
40.0
60.0
80.0
100.0
: Noise level is under 40V
Ceramic Capacitor 10F
100.0
10.0
1.0
0.1
0.0
Output Current I
OUT
(mA)
ESR(W)
0.0
20.0
40.0
60.0
80.0
100.0
: Noise level is under 40V
APPLICATION HINTS
When using these ICs, be sure to take care regarding the following points :
In these ICs, phase compensation is made for securing stable operation even when the load current is var-
ied. For this purpose, be sure to use a capacitor C
OUT
with good frequency characteristics and ESR in the
range described above.
Make V
DD
and GND lines sufficient. If their impedance is high, the noise picked up or unstable operation
may result.
Connect the capacitor with a capacitance of about 1F between V
DD
and GND with wiring as short as possi-
ble.
Set external components as close as possible to the ICs and make wiring as short as possible.
19
Rx5RZ
The power dissipation of RN5RZ series (SOT-23-5) is measured. The measuring conditions as follows:
15.0
15.0
1.0
1.0
1.3
0.7
Material : glass cloth epoxy plastic
Size of the board : 15
15
1.6mm
Wind velocity : 0m/s
Mounted with solder
RN5RZ30B(SOT-23-5)
450
350
300
400
250
200
150
100
50
0
Ambient Temperature Topt(C)
Power Dissipation P
D
(mW)
0
25
50
75
150
125
100
Mounted on the board
Free air
POWER DISSIPATION
Unit : mm
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