300mA Low Voltage LDO REGULATOR
R1131x SERIES NO. EA-116-0503
1
OUTLINE
The R1131x Series are CMOS-based low voltage regulator ICs with output voltage range from 0.8V to 3.3V.
The minimum operating voltage is 1.4V. Each of these voltage regulator ICs consists of a voltage reference unit,
an error amplifier, resistors for setting output voltage, a current limit circuit, and a chip enable circuit.
To prevent the destruction by over current, current limit circuit is included. Standby mode realizes ultra small
consumption current.
The output voltage of these ICs is internally fixed with high accuracy. Since the packages for these ICs are
SOT-23-5, SON-6, and HSON-6, high density mounting of the ICs on boards is possible.
FEATURES
• Ultra-Low Supply Current .................................Typ. 80µA (VOUT<1.8V),
Typ. 60µA (VOUT
>
=
1.8V)
• Standby Mode ...................................................Typ. 0.1µA
• Low Dropout Voltage.........................................Typ. 0.48V(IOUT=300mA Output Voltage=1.0V Type)
Typ. 0.31V(IOUT=300mA Output Voltage=1.5V Type)
Typ. 0.23V(IOUT=300mA Output Voltage=3.0V Type)
• High Ripple Rejection .......................................Typ. 65dB(f=1kHz)
• Low Temperature-Drift Coefficient of Output Voltage Typ. ±100ppm/°C
• Excellent Line Regulation .................................Typ. 0.01%/V
• High Output Voltage Accuracy ..........................±2.0%
• Small Package ................................................SOT-23-5(Super Mini-mold), SON-6, HSON-6
• Output Voltage ..................................................Stepwise setting with a step of 0.1V in the range of
0.8V to 3.3V is possible
• Input Voltage .....................................................Min. 1.40V
• Built-in fold-back protection circuit ....................Typ. 50mA (Current at short mode)
• External Capacitors...........................................CIN = COUT = Tantalum 1.0µF (VOUT<1.0V)
C
IN = COUT =Ceramic 1.0µF (VOUT
>
=
1.0V)
APPLICATIONS
• Precision Voltage References.
• Power source for electrical appliances such as cameras, VCRs and hand-held communication equipment.
• Power source for battery-powered equipment.
R1131x
2
BLOCK DIAGRAM
R1131xxxxA R1131xxxxB
VDD VOUT
CE GND
Current Limit
Vref
V
OUT
GND
V
DD
CE
Vref
Current Limit
+
-
R1131xxxxD
VOUT
GND
VDD
CE
Vref
Current Limit
+
-
SELECTION GUIDE
The output voltage, the chip enable polarity, package type, and the taping type for the ICs can be selected at
the user's request. The selection can be available by designating the part number as shown below;
R1131xxxxx-xx ←Part Number
↑ ↑ ↑ ↑ ↑
a b a'c d
Code Contents
a, a'
Designation of Package Type :
R1131Nxx1x-xx:SOT-23-5 (Mini-mold)
R1131Dxx1x-xx:SON-6,
R1131Dxx2x-xx:HSON-6
b
Setting Output Voltage (VOUT):Stepwise setting with a step of 0.1V in the
range of 0.8V to 3.3V is possible. If the output=1.85V, then the code is
R1131x18xx5. If the output=2.85, then the code is R1131x28xx5.
c
Designation of Chip Enable Option :
A:“L” active type.
B:“H” active type.
D:"H" active and with auto discharge function
d Designation of Taping Type : TR
Refer to Taping Specifications
R1131x
3
PIN CONFIGURATIONS
SOT-23-5 SON-6 HSON-6
12
3
54
(mark side)
1
2
3
6
5
4
654
123
PIN DESCRIPTIONS
• SOT-23-5
Pin No Symbol Pin Description
1 VDD Input Pin
2 GND Ground Pin
3 CE or CE Chip Enable Pin
4 NC No Connection
5 VOUT Output pin
• SON-6, HSON-6
Pin No Symbol Pin Description
1 VDD Input Pin
2 NC No Connection
3 VOUT Output pin
4 NC No Connection
5 GND Ground Pin
6 CE or CE Chip Enable Pin
∗ Tabs and tab suspension leads could be short to the GND level.
R1131x
4
ABSOLUTE MAXIMUM RATINGS
Symbol Item Rating Unit
VIN Input Voltage 6.5 V
VCE Input Voltage( CE /CE Pin) −0.3 ~ 6.5 V
VOUT Output Voltage −0.3 ~ VIN+0.3 V
IOUT Output Current 350 mA
Power Dissipation(SOT23-5)
Power Dissipation(SON-6)
250
PD
Power Dissipation(HSON-6) 400
mW
Topt Operating Temperature Range −40 ~ 85 °C
Tstg Storage Temperature Range −55 ~ 125 °C
ELECTRICAL CHARACTERISTICS
• R1131xxxxA Topt=25°C
Symbol Item Conditions Min. Typ. Max. Unit
VOUT Output Voltage VIN =Set VOUT+1V
1µA
<
=
IOUT
<
=
30mA Note 1
VOUT
×0.98
(−30mV)
VOUT
×1.02
(30mV)
V
IOUT Output Current VIN − VOUT =1.0V 300 mA
∆VOUT/
∆IOUT Load Regulation VIN =Set VOUT+1V,
1mA
<
=
IOUT
<
=
300mA 40 70 mV
VDIF Dropout Voltage
Refer to the ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE
VIN = Set VOUT+1V,VOUT<1.8V 80 111
µA
ISS1 Supply Current
VIN = Set VOUT+1V,VOUT
>
=
1.8V 60 90
µA
Istandby Supply Current (Standby) VIN = VCE = Set VOUT+1V 0.1 1.0
µA
∆VOUT/
∆VIN Line Regulation
Set VOUT+0.5V
<
=
VIN
<
=
6.0V
IOUT = 30mA
Set VOUT < 0.9V: 1.4V
<
=
VIN
<
=
6.0V
0.01 0.15 %/V
RR Ripple Rejection f = 1kHz, Ripple 0.2Vp-p
VIN = Set VOUT +1V,IOUT = 30mA 65 dB
VIN Input Voltage 1.4 6.0 V
∆VOUT/
∆T
Output Voltage
Temperature Coefficient
IOUT = 30mA
−40°C
<
=
Topt
<
=
85°C ±100 ppm
/°C
ILIM Short Current Limit VOUT = 0V 50 mA
RPU CE Pull-up Resistance 1.87 5.00 12.00 MΩ
VCEH CE Input Voltage “H” 1.0 6.0 V
VCEL CE Input Voltage “L” 0.0 0.3 V
VEN Output Noise BW =10Hz to 100kHz 30
µ
Vrms
Note1: ±30mV tolerance for VOUT
<
=
1.5V.
R1131x
5
• R1131xxxxB/D Topt=25°C
Symbol Item Conditions Min. Typ. Max. Unit
VOUT Output Voltage VIN=Set VOUT+1V
1µA
<
=
IOUT
<
=
30mA Note 1
VOUT
×0.98
(−30mV)
VOUT
×1.02
(30mV)
V
IOUT Output Current VIN − VOUT =1.0V 300 mA
∆VOUT/
∆IOUT Load Regulation VIN=Set VOUT+1V
1mA
<
=
IOUT
<
=
300mA 40 70 mV
VDIF Dropout Voltage
Refer to the ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE
VIN =Set VOUT+1V,VOUT<1.8V 80 111
µA
ISS1 Supply Current
VIN =Set VOUT+1V,VOUT
>
=
1.8V 60 90
µA
Istandby Supply Current (Standby) VIN=Set VOUT+1V, VCE=GND 0.1 1.0
µA
∆VOUT/
∆VIN Line Regulation
Set VOUT+0.5V
<
=
VIN
<
=
6.0V
IOUT=30mA
Set VOUT<0.9V: 1.4V
<
=
VIN
<
=
6.0V
0.01 0.15 %/V
RR Ripple Rejection f =1kHz, Ripple 0.2Vp-p
VIN =Set VOUT+1V,IOUT =30mA 65 dB
VIN Input Voltage 1.4 6.0 V
∆VOUT/
∆T
Output Voltage
Temperature Coefficient
IOUT =30mA
−40°C
<
=
Topt
<
=
85°C ±100 ppm
/°C
ILIM Short Current Limit VOUT =0V 50 mA
RPDC CE Pull-down Resistance 1.87 5.00 12.00 MΩ
VCEH CE Input Voltage “H” 1.0 VIN V
VCEL CE Input Voltage “L” 0.0 0.3 V
VEN Output Noise BW=10Hz to 100kHz 30
µ
Vrms
RLOW
Nch On Resistance for auto
discharge
(applied to D version only)
VCE =0V 60 Ω
Note1: ±30mV tolerance for VOUT
<
=
1.5V.
ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE
Topt = 25°C
Dropout Voltage
VDIF (V)
VDIF
Output Voltage VOUT
(V) Condition Typ. Max.
0.8=VOUT 0.620 0.850
0.9=VOUT 0.550 0.780
1.0
<
=
VOUT
<
=
1.5 0.480 0.700
1.5
<
=
VOUT
<
=
2.6 0.310 0.450
2.6
<
=
VOUT
IOUT = 300mA
0.230 0.350
R1131x
6
TECHNICAL NOTES
When using these ICs, consider the following points:
Phase Compensation
In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For
this purpose, be sure to use a 1.0µF or more capacitor COUT with good frequency characteristics and ESR
(Equivalent Series Resistance).
(Note: If a tantalum capacitor is connected to the Output pin for phase compensation, if the ESR value of the
capacitor is too large, the operation might be unstable. Because of this, test these ICs with as same external
components as ones to be used on the PCB.)
Chip capacitor characteristics of Bias dependence and Temperature characteristics may vary depending on its
size, manufacturer, and part number.
PCB Layout
Make VDD and GND lines sufficient. If their impedance is high, pick-up the noise or unstable operation may
result. Connect a capacitor with as much as 1.0mF capacitor between VDD and GND pin as close as possible.
Set external components, especially the output capacitor, as close as possible to the ICs, and make wiring as
short as possible.
TYPICAL APPLICATION
VDD
GND
CE
OUT
R1131xxxxx
SERIES A
IOUT
C2 C1
VIN
External Components examples:
CM05X5R105K06AB (Kyocera)
C1005JBOJ105K (TDK)
GRM155B30J105KE18B (Murata)
Output Capacitor; 1.0µF or more capacity ceramic Type (If VOUT<1.0V, Tantalum Type is recommended)
Input Capacitor, 1.0µF or more capacity ceramic Type
R1131x
7
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
R1131x08xx R1131x15xx
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0 100 200 300 400 500 600
Output Current lOUT (mA)
Output Voltage VOUT (V)
1.45V
VIN =2.8V
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0 100 200 300 400 500 600
Output Current l
OUT
(mA)
Output Voltage V
OUT
(V)
1.8V
V
IN
=3.5V
R1131x26xx R1131x33xx
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0 100 200 300 400 500 600
Output Current l
OUT
(mA)
Output Voltage V
OUT
(V)
2.9V
VIN =4.6V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0 100 200 300 400 500 600
Output Current l
OUT
(mA)
Output Voltage V
OUT
(V)
3.6V
V
IN
=5.3V
2) Output Voltage vs. Input Voltage
R1131x08xx R1131x15xx
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0123456
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
I
OUT
= 1mA
I
OUT
=30mA
I
OUT
=50mA
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
Output Voltage V
OUT
(V)
I
OUT
= 1mA
I
OUT
=30mA
I
OUT
=50mA
0123456
Input Voltage V
IN
(V)
R1131x
8
R1131x26xx R1131x33xx
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0123456
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
I
OUT
= 1mA
I
OUT
=30mA
I
OUT
=50mA
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Output Voltage V
OUT
(V)
I
OUT
= 1mA
I
OUT
=30mA
I
OUT
=50mA
0123456
Input Voltage V
IN
(V)
3) Supply Current vs. Input Voltage
R1131x08xx R1131x15xx
0
10
20
30
40
50
60
70
80
90
100
0123456
Input Voltage V
IN
(V)
Supply Current I
SS
H (µA)
0
10
20
30
40
50
60
70
80
90
0123456
Input Voltage V
IN
(V)
Supply Current I
SS
H (µA)
R1131x26xx R1131x33xx
0
10
20
30
40
50
60
70
80
90
0123456
Input Voltage V
IN
(V)
Supply Current I
SS
H (µA)
0
10
20
30
40
50
60
70
80
90
0123456
Input Voltage V
IN
(V)
Supply Current I
SS
H (µA)
R1131x
9
4) Output Voltage vs. Temperature
R1131x08xx R1131x15xx
0.77
0.78
0.79
0.80
0.81
0.82
0.83
0.84
-50 -25 0 25 50 75 100
Output Voltage V
OUT
(V)
Temperature Topt ( )
1.46
1.47
1.48
1.49
1.50
1.51
1.52
1.53
-50 -25 0 25 50 75 100
Output Voltage V
OUT
H (V)
Temperature Topt ( )
R1131x26xx R1131x33xx
2.57
2.58
2.59
2.60
2.61
2.62
2.63
2.64
-50 -25 0 25 50 75 100
Output Voltage V
OUT
H (V)
Temperature Topt ( )
3.23
3.25
3.27
3.29
3.31
3.33
3.35
3.37
-50 -25 0 25 50 75 100
Output Voltage V
OUT
H (V)
Temperature Topt ( )
5) Supply Current vs. Temperature
R1131x08xx R1131x15xx
0
10
20
30
40
50
70
110
90
60
100
80
-50 -25 0 25 50 75 100
Supply Current IssH (µA)
Temperature Topt ( )
0
10
20
30
40
50
60
80
70
-50 -25 0 25 50 75 100
Supply Current IssH (µA)
Temperature Topt ( )
R1131x
10
R1131x26xx R1131x33xx
0
10
20
30
40
50
60
80
70
-50 -25 0 25 50 75 100
Supply Current IssH (µA)
Temperature Topt ( )
0
10
20
30
40
50
60
80
70
-50 -25 0 25 50 75 100
Supply Current IssH (µA)
Temperature Topt ( )
6) Dropout Voltage vs. Output Current
R1131x08xx R1131x09xx
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0 50 100 150 200 250 300
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
_H (V)
85
25
-40
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0 50 100 150 200 250 300
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
_H (V)
85
25
-40
R1131x10xx R1131x15xx
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0 50 100 150 200 250 300
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
_H (V)
85
25
-40
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0 50 100 150 200 250 300
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
_H (V)
85
25
-40
R1131x
11
R1131x26xx R1131x33xx
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0 50 100 150 200 250 300
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
_H (V)
85
25
-40
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0 50 100 150 200 250 300
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
_H (V)
85
25
-40
7) Dropout Voltage vs. Set Output Voltage (Topt=25°C)
R1131xxx1x
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.5 1 1.5 2 2.5 3 3.5
Set Output Voltage VREG (V)
Dropout Voltage V
DIF
_H (V)
I
OUT
=10mA
50mA
200mA
30mA
100mA
300mA
8) Ripple Rejection vs. Input Bias (Topt=25°C CIN=none, COUT=Ceramic 1.0µF Ripple 0.2VP-P)
R1131x26xx (IOUT=1mA) R1131x26xx (IOUT=30mA)
0
10
20
30
40
50
60
70
80
2.6 2.7 2.8 2.9 3.0 3.1 3.2
Input Voltage V
IN
(V)
Ripple Rejection RR (dB)
f = 400Hz
f = 10kHz
f = 1kHz
f = 100kHz
0
10
20
30
40
50
60
70
80
2.6 2.7 2.8 2.9 3.0 3.1 3.2
Input Voltage V
IN
(V)
Ripple Rejection RR (dB)
f = 400Hz
f = 10kHz
f = 1kHz
f = 100kHz
R1131x
12
R1131x26xx (IOUT=50mA)
0
10
20
30
40
50
60
70
80
2.6 2.7 2.8 2.9 3.0 3.1 3.2
Input Voltage V
IN
(V)
Ripple Rejection RR (dB)
f = 400Hz
f = 10kHz
f = 1kHz
f = 100kHz
9) Ripple Rejection vs. Frequency (CIN=none)
R1131x08xx R1131x08xx
VIN=1.8VDC+0.2Vp-p,
COUT=Tantal 1.0µF
VIN=1.8VDC+0.2Vp-p,
COUT=Tantal 2.2µF
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100
Frequency f (kHz)
RIpple Rejection RR_H (dB)
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100
Frequency f (kHz)
RIpple Rejection RR_H (dB)
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
R1131x10xx R1131x10xx
VIN=2.0VDC+0.2Vp-p,
COUT=Ceramic 1.0µF
VIN=2.0VDC+0.2Vp-p,
COUT=Ceramic 2.2µF
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100
Frequency f (kHz)
RIpple Rejection RR_H (dB)
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100
Frequency f (kHz)
RIpple Rejection RR_H (dB)
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
R1131x
13
R1131x15xx R1131x15xx
VIN=2.5VDC+0.2Vp-p,
COUT=1.0µF
VIN=2.5VDC+0.2Vp-p,
COUT=2.2µF
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100
Frequency f (kHz)
RIpple Rejection RR_H (dB)
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100
Frequency f (kHz)
RIpple Rejection RR_H (dB)
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
R1131x26xx R1131x26xx
VIN=3.6VDC+0.2Vp-p,
COUT = Ceramic 1.0µF
VIN=3.6VDC+0.2Vp-p,
COUT = Ceramic 2.2µF
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100
Frequency f (kHz)
RIpple Rejection RR_H (dB)
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100
Frequency f (kHz)
RIpple Rejection RR_H (dB)
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
R1131x33xx R1131x33xx
VIN=4.3VDC+0.2Vp-p,
COUT = Ceramic 1.0µF
VIN=4.3VDC+0.2Vp-p,
COUT= Ceramic 2.2µF
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100
Frequency f (kHz)
RIpple Rejection RR_H (dB)
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100
Frequency f (kHz)
RIpple Rejection RR_H (dB)
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
R1131x
14
10) Input Transient Response (CIN = none, tr=tf=5µs)
R1131x08xx R1131x10x
IOUT=30mA,
COUT = Tantalum 1.0µF
IOUT=30mA,
COUT = Ceramic 1.0µF
0.76
0.78
0.80
0.82
0.84
0.86
0.88
-2
-1
0
1
2
3
4
0102040608010030 50 70 90
Time t (µs)
Output Voltage V
OUT
(V)
Input Voltage
Output Voltage
Input Voltage V
IN
(V)
0.96
0.98
1.00
1.02
1.04
1.06
1.08
-2
-1
0
1
2
3
4
0102040608010030 50 70 90
Time t (µs)
Output Voltage VOUT (V)
Input Voltage
Output Voltage
Input Voltage VIN (V)
R1131x26xx
IOUT=30mA,
COUT= Ceramic 1.0µF
2.56
2.58
2.60
2.62
2.64
2.66
2.68
-1
0
1
2
3
4
4
0102040608010030 50 70 90
Time t (µs)
Output Voltage VOUT (V)
Input Voltage
Output Voltage
Input Voltage VIN (V)
11) Load Transient Response (tr=tf=0.5µs)
R1131x08xx R1131x08xx
VIN=1.8V
CIN= tantalum 1.0µF,C OUT = tantalum 1.0µF
VIN=1.8V,
CIN = tantalum 1.0µF COUT = tantalum 2.2µF
0.6
0.7
0.8
0.9
1.0
1.1
1.2
-150
-100
-50
0
50
100
150
0 5 10 20 30 4015 25 35
Time t (µs)
Output Voltage VOUT (V)
Output Voltage
Load Current IOUT (mA)
Load Current
0.6
0.7
0.8
0.9
1.0
1.1
1.2
-120
-90
-60
-30
0
30
60
0 5 10 20 30 4015 25 35
Time t (µs)
Output Voltage VOUT (V)
Load Current
Output Voltage
Load Current IOUT (mA)
R1131x
15
R1131x10xx R1131x10xx
VIN=2.0V,
CIN = Ceramic 1.0µF COUT= Ceramic 1.0µF
VIN=2.0V,
CIN= Ceramic 1.0µF, C OUT = Ceramic 2.2µF
0.8
0.9
1.0
1.1
1.2
1.3
1.4
-150
-100
-50
0
50
100
150
0 5 10 20 30 4015 25 35
Time t (µs)
Output Voltage VOUT (V)
Load Current
Output Voltage
Load Current IOUT (mA)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
-150
-100
-50
0
50
100
150
0 5 10 20 30 4015 25 35
Time t (µs)
Output Voltage VOUT (V)
Load Current
Output Voltage
Load Current IOUT (mA)
R1131x10xx R1131x10xx
VIN=2.0V,
CIN = Ceramic 1.0µF COUT = Ceramic 1.0µF
VIN=2.0V,
CIN = Ceramic 1.0µF COUT = Ceramic 2.2µF
0.8
0.9
1.0
1.1
1.2
1.3
1.4
-120
-90
-60
-30
0
30
60
0 5 10 20 30 4015 25 35
Time t (µs)
Output Voltage VOUT (V)
Load Current
Output Voltage
Load Current IOUT (mA)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
-120
-90
-60
-30
0
30
60
0 5 10 20 30 4015 25 35
Time t (µs)
Output Voltage VOUT (V)
Load Current
Output Voltage
Load Current IOUT (mA)
R1131x26xx R1131x26xx
VIN=3.6V,
CIN = Ceramic 1.0µF COUT = Ceramic 1.0µF
VIN=3.6V,
CIN = Ceramic 1.0µF COUT = Ceramic 2.2µF
2.4
2.5
2.6
2.7
2.8
2.9
3.0
-150
-100
-50
0
50
100
150
0 5 10 20 30 4015 25 35
Time t (µs)
Output Voltage VOUT (V)
Load Current
Output Voltage
Load Current IOUT (mA)
2.4
2.5
2.6
2.7
2.8
2.9
3.0
-150
-100
-50
0
50
100
150
0 5 10 20 30 4015 25 35
Time t (µs)
Output Voltage VOUT (V)
Load Current
Output Voltage
Load Current IOUT (mA)
R1131x
16
R1131x26xx R1131x26xx
VIN=3.6V,
CIN = Ceramic 1.0µF COUT = Ceramic 1.0µF
VIN=3.6V,
CIN = Ceramic 1.0µF COUT = Ceramic 2.2µF
2.4
2.5
2.6
2.7
2.8
2.9
3.0
-120
-90
-60
-30
0
30
60
0 5 10 20 30 4015 25 35
Time t (µs)
Output Voltage VOUT (V)
Load Current
Output Voltage
Load Current IOUT (mA)
2.4
2.5
2.6
2.7
2.8
2.9
3.0
-120
-90
-60
-30
0
30
60
0 5 10 20 30 4015 25 35
Time t (µs)
Output Voltage VOUT (V)
Load Current
Output Voltage
Load Current IOUT (mA)
12) Turn on speed with CE pin
R1131x08xx R1131x08xx
VIN=1.8V, CIN = Tantalum 1.0µF
COUT = Tantalum 1.0µF
VIN=1.8V, CIN = Tantalum 1.0µF
COUT = Tantalum 1.0µF
-2.7
-1.8
-0.9
0.0
0.9
1.8
2.7
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
-30 -20 -10 10 30 50 700 204060
Time t (µs)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=0V→1.8V
IOUT=0mA
-2.7
-1.8
-0.9
0.0
0.9
1.8
2.7
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
-30 -20 -10 10 30 50 700 204060
Time t (µs)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=0V→1.8V
IOUT=30mA
R1131x08xx R1131x33xx
VIN=1.8V, CIN = Tantalum 1.0µF
COUT = Tantalum 1.0µF
VIN=4.3V, CIN = Ceramic 1.0µF
COUT = Ceramic 1.0µF
-2.7
-1.8
-0.9
0.0
0.9
1.8
2.7
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
-30 -20 -10 10 30 50 700 204060
Time t (µs)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=0V→1.8V
IOUT=300mA
-10
-8
-6
-4
0
4
-2
2
6
-1
0
1
2
4
6
3
5
7
-60 -40 -20 20 60 100 1400 40 80 120
Time t (µs)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=0V→4.3V
IOUT=0mA
R1131x
17
R1131x33xx (ECO=H) R1131x33xx (ECO=L)
VIN=4.3V, CIN = Ceramic 1.0µF
COUT = Ceramic 1.0µF
VIN=4.3V, CIN = Ceramic 1.0µF
COUT = Ceramic 1.0µF
-10
-8
-6
-4
0
4
-2
2
6
-1
0
1
2
4
6
3
5
7
-60 -40 -20 20 60 100 1400 40 80 120
Time t (µs)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=0V→4.3V
IOUT=30mA
-10
-8
-6
-4
0
4
-2
2
6
-1
0
1
2
4
6
3
5
7
-60 -40 -20 20 60 100 1400 40 80 120
Time t (µs)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=0V→4.3V
IOUT=300mA
13) Turn-off Speed with CE
R1131x08xD R1131x08xD
VIN=1.8V, CIN = Tantalum 1.0µF
COUT = Tantalum 1.0µF
VIN=1.8V, CIN = Tantalum 1.0µF
COUT = Tantalum 1.0µF
-1.8
-1.2
-0.6
0.0
1.2
2.4
0.6
1.8
-0.5
0.0
0.5
1.0
2.0
3.0
1.5
2.5
-0.6 -0.4 -0.2 0.2 0.6 1.00 0.4 0.8 1.2
Time t (ms)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=1.8V→0V
IOUT=0mA
-1.8
-1.2
-0.6
0.0
1.2
2.4
0.6
1.8
-0.5
0.0
0.5
1.0
2.0
3.0
1.5
2.5
-0.6 -0.4 -0.2 0.2 0.6 1.00 0.4 0.8 1.2
Time t (ms)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=1.8V→0V
IOUT=30mA
R1131x08xD R1131x33xD
VIN=1.8V, CIN = Tantalum 1.0µF
COUT = Tantalum 1.0µF
VIN=4.3V, CIN = Ceramic 1.0µF
COUT = Ceramic 1.0µF
-1.8
-1.2
-0.6
0.0
1.2
2.4
0.6
1.8
-0.5
0.0
0.5
1.0
2.0
3.0
1.5
2.5
-0.6 -0.4 -0.2 0.2 0.6 1.00 0.4 0.8 1.2
Time t (ms)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=1.8V→0V
IOUT=300mA
-5
-4
-3
-2
1
4
-1
3
5
-1
0
1
2
5
8
3
7
0
2
4
6
9
-0.3 -0.2 -0.1 0.1 0.3 0.5 0.70 0.2 0.4 0.6
Time t (ms)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=4.3V→0V
IOUT=0mA
R1131x
18
R1131x33xD R1131x33xD
VIN=4.3V, CIN = Ceramic 1.0µF
COUT = Ceramic 1.0µF
VIN=4.3V, CIN = Ceramic 1.0µF
COUT = Ceramic 1.0µF
-5
-4
-3
-2
1
4
-1
3
5
-1
0
1
2
5
8
3
7
0
2
4
6
9
-0.3 -0.2 -0.1 0.1 0.3 0.5 0.70 0.2 0.4 0.6
Time t (ms)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=4.3V→0V
IOUT=30mA
-5
-4
-3
-2
1
4
-1
3
5
-1
0
1
2
5
8
3
7
0
2
4
6
9
-0.3 -0.2 -0.1 0.1 0.3 0.5 0.70 0.2 0.4 0.6
Time t (ms)
CE Input Voltage VCE (V)
Output Voltage VOUT (V)
VCE=4.3V→0V
IOUT=300mA
TECHNICAL NOTES
When using these ICs, consider the following points:
In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For
this purpose, be sure to use a capacitor COUT with good frequency characteristics and ESR (Equivalent Series
Resistance) of which is in the range described as follows:
The relations between IOUT (Output Current) and ESR of Output Capacitor are shown below. The conditions
when the white noise level is under 40µV(Avg.) are marked as the hatched area in the graph.
<Test conditions>
(1) Frequency band: 10Hz to 2MHz
(2) Temperature: 25°C
R1131x08xx R1131x10xx
VIN=1.4V to 6.0V,
CIN = Ceramic 1.0µF COUT = Ceramic 1.0µF
VIN=1.4V to 6.0V,
CIN = Ceramic 1.0µF COUT = Ceramic 1.0µF
0.01
0.1
1
10
100
0 50 100 150 200 250 300
Output Current l
OUT
(mA)
ESR (Ω)
0.01
0.1
1
10
100
0 50 100 150 200 250 300
Output Current l
OUT
(mA)
ESR (Ω)
R1131x
19
R1131x26xx R1131x15xx
VIN=3.0V to 6.0V,
CIN = Ceramic 1.0µF COUT = Ceramic 1.0µF
VIN=2.0V to 6.0V,
CIN = Ceramic 1.0µF COUT = Ceramic 1.0µF
0.01
0.1
1
10
100
0 50 100 150 200 250 300
Output Current l
OUT
(mA)
ESR (Ω)
0.01
0.1
1
10
100
0 50 100 150 200 250 300
Output Current l
OUT
(mA)
ESR (Ω)
R1131x33xx
VIN=3.6V to 6.0V,
CIN = Ceramic 1.0µF COUT = Ceramic 1.0µF
0.01
0.1
1
10
100
0 50 100 150 200 250 300
Output Current l
OUT
(mA)
ESR (Ω)
