R1171x SERIES
2.0A/1.5A LDO REGULATOR
NO. EA-125-090202
1
OUTLINE
The R1171x Series are CMOS-based positive voltage regulator ICs. The R1171x Series have features of low
dropout voltage, high output voltage accuracy, low consumption current. Each of these ICs consists of a voltage
reference unit, an error amplifier, resistor net for setting output voltage, a current limit circuit at short mode, a
chip enable circuit, and ther mal shutdown circuit. The output voltag e of R1171 is fixed in the IC.
Low consumption current by the merit of CMOS process and built-in transistors with low ON-resistance make
low dropout voltage and chip enable function prolongs the battery life. These regulators are remarkable
improvement on the current regulators in terms of inpu t transient response, and load transient response.
Thus, the R1171x Series are suitable for various power sources.
Since the packag es for these ICs are high watt age HS OP-6J p ackage, T O-252 -5-P1, high density mounting of
the ICs on boards is possible.
FEATURES
• Supply Current............................................................. Typ. 130μA
• Standby Current........................................................... Typ. 0.1μA
• Output Current ............................................................. Min. 1.5A (VIN=VOUT+1.0V, R1171Sxx1A/B)
Min. 2.0A (VIN=VOUT+1.0V, R1171Jxx1C/D)
• Input Voltage................................................................ 2.1V to 6.0V
• Output Voltage ............................................................. 1.5V to 5.0V (R1171Sxx1A/B)
1.8V to 5.0V (R1171Jxx1C/D)
• Output Voltage Accuracy.............................................. ± 2.0%
• Dropout Voltage ........................................................... Typ. 0.09V (VOUT=3.0V, IOUT=300mA)
• Temperature-drift Coefficient of Output Voltage........... Typ. ± 100ppm/°C
• Line Regulation............................................................ Typ. 0.05%/V
• Packages ..................................................................... HSOP-6J, TO -252-5-P1
• Built-in Current Limit Circuit
• Built-in Ther mal Shutdown Circuit
• Ceramic capacitor for phase compensation ................ CIN=COUT=Ceramic 10μF (VOUT<1.8V)
C
IN=COUT=Ceramic 4.7μF (VOUT
>
=
1.8V)
APPLICATIONS
• Local Power source for Notebook PC.
• Local Power source for portable appliances, cam eras, and videos.
• Local Power source for equipment of battery-use.
• Local Power source for home appliances.
R1171x
2
BLOCK DIAGRAMS
R1171xxx1A/C R1171xxx1B/D
VDD
GND
VOUT
CE
Vref
Current Limit
Thermal Shutdown
GND
VDD
GND
VOUT
CE
Vref
Current Limit
Thermal Shutdown
GND
SELECTION GUIDE
The output voltage, the chi p-enable polarity, the taping type can be selected at the user's request.
The selection can be made with the part number as follows;
R1171xxx1x-xx-x ←Part Number
↑ ↑ ↑ ↑ ↑
a b c d e
Code Contents
a Package Type;
S: HSOP-6J
J: TO-252-5-P1
b
Designation of Output Voltage (VOUT)
Stepwise setting with 0.1V increment in the range from 1.5V to 5.0V (A/B version),
from 1.8V to 5.0V (C/D version).
Exception; 1.85V Type: R1171x181x5, 2.85V type: R1171x281x5-xx
c
Designation of option;
A: Built-in Chip Enable Circuit, Active at "L" (Output Current :Min.1.5A)
B: Built-in Chip Enable Circuit, Active at "H" (Output Current :Min.1.5A)
C: Built-in Chip Enable Circuit, Active at "L" (Output Current :Min.2.0A)
D: Built-in Chip Enable Circuit, Active at "H" (Output Current :Min.2.0A)
d Designation of Taping Type;
E2: HSOP-6J
T1: TO-252-5-P1 (Refer to Taping Specifications)
e Designation of composition of pin plating:
-F: Lead free solder plating (HSOP-6J, T O-252-5-P1)
R1171x
3
PIN CONFIGURATIONS
HSOP-6J TO-252-5-P1
R
65 4
12 3
12345
PIN DESCRIPTIONS
•
HSOP-6J
•
TO-252-5-P1
Pin No. Symbol Description Pin No. Symbol Description
1 VOUT Output Pin 1 VOUT Output Pin
2 GND Ground Pin 2
CE or CE Chip Enable Pin
3 CE or CE Chip Enable Pin 3 GND Ground Pin
4 NC No Connection 4 GND Ground Pin
5 GND Ground Pin 5 VDD Input Pin
6 VDD Input Pin
*) No.3 and No.4 pins must be wired short each
other and connected to the GND plane when it is
mounted on board.
R1171x
4
ABSOLUTE MAXIMUM RATINGS
Symbol Item Rating Unit
VIN Input Voltage 7.0 V
VCE Input Voltage ( CE or CE Input Pin) −0.3 to VIN+0.3 V
VOUT Output Voltage −0.3 to VIN+0.3 V
IOUT Output Current 3.5 A
Power Dissipation (HSOP-6J)∗1 1700
PD Power Dissi pation (TO-252-5-P1)∗1 1900 mW
Topt Operating Temperature −40 to 85 °C
Tstg Storage Temperature −55 to 125 °C
∗1) For Power Dissipation, please refer to PACKAGE INFORMATION to be described.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the
permanent damages and may degrade the life time and safety for both device and system u sing the device
in the field.
The functional operation at or over these absolute maximum ratings is not assured.
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment sho uld b e designed that the mounted semiconductor device s o perate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the
recommended operating conditions, even if when they are used over such conditions by momentary
electronic noise or su rge.
And the semiconductor devices may receive serious damage when they continue to operate over the
recommended operating conditions.
R1171x
5
ELECTRICAL CHARACTERISTICS
• R1171Sxx1A Topt=25°C
Symbol Item Conditions Min. Typ. Max. Unit
VOUT Output Voltage VIN−VOUT=1.0V, IOUT=200mA ×0.98 ×1.02 V
IOUT Output Current VIN−VOUT=1.0V 1.5 A
ΔVOUT/
ΔIOUT Load Regulation VIN−VOUT=1.0V
1mA
<
=
IOUT
<
=
300mA 10 60 mV
1.5
<
=
VOUT<1.6 0.16 0.35
1.6
<
=
VOUT<1.7 0.14 0.32
1.7
<
=
VOUT<1.8 0.13 0.28
1.8
<
=
VOUT<2.0 0.12 0.24
2.0
<
=
VOUT<2.5 0.10 0.21
VDIF Dropout Voltage IOUT=300mA
2.5
<
=
VOUT
<
=
5.0 0.09 0.18
V
ISS Supply Current VIN−VOUT =1.0V, VCE=0V 130 320
μA
Istandby Standby Current VIN−VOUT=1.0V, VIN=VCE 0.1 2.0 μA
ΔVOUT/ΔVIN Line Regulation IOUT=200mA
RR Ripple Rejection f=1kHz, Ripple 0.5Vp-p Refer to the following table
VIN Input Voltage 2.1 6.0 V
ΔVOUT/
ΔTopt Output Voltage
Temperature Coefficient IOUT=10mA
−40°C
<
=
Topt
<
=
85°C ±100 ppm/°C
Ilim Short Current Limit VOUT=0V 200 mA
RPU Pull-up resistance for CE pin 2.5 5.0 10.0
MΩ
VCEH CE Input Voltage "H" 1.2 VIN V
VCEL CE Input Voltage "L" 0 0.25 V
TTSD Thermal Shut down
Detector Threshold Temperature Junction Temperature 150 °C
TTSR Thermal Shut down
Released Temperature Junction Temperature 120 °C
• Line Regulation b y Output Voltage Topt=25°C
Line Regulation ΔVOUT/ΔVIN (%/V)
Output Voltage
VOUT (V) Condition Typ. Max.
1.5
<
=
VOUT < 1.6 IOUT=200mA, 2.1V
<
=
VIN
<
=
6.0V
1.6
<
=
VOUT
<
=
5.0 IOUT=200mA, VOUT+0.5V
<
=
VIN
<
=
6.0V 0.05 0.30
• Ripple Rejection b y Output Voltage Topt=25°C
Ripple Rejection RR (dB)
Output Voltage
VOUT (V) Condition Typ.
1.5
<
=
VOUT < 4.7 f=1kHz, Ripple 0.5Vp-p, VIN−VOUT=1.0V
4.7
<
=
VOUT
<
=
5.0 f=1kHz, Ripple 0.5Vp-p, VIN=5.75V 50
R1171x
6
• R1171Sxx1B Topt=25°C
Symbol Item Conditions Min. Typ. Max. Unit
VOUT Reference Voltage for
Adjustable Voltage Regulator VIN−VOUT=1.0V
IOUT=200mA ×0.98 ×1.02 V
IOUT Output Current VIN−VOUT=1.0V 1.5 A
ΔVOUT/
ΔIOUT Load Regulation VIN−VOUT=1.0V
1mA
<
=
IOUT
<
=
300mA 10 60 mV
1.5
<
=
VOUT<1.6 0.16 0.35
1.6
<
=
VOUT<1.7 0.14 0.32
1.7
<
=
VOUT<1.8 0.13 0.28
1.8
<
=
VOUT<2.0 0.12 0.24
2.0
<
=
VOUT<2.5 0.10 0.21
VDIF Dropout Voltage IOUT=300mA
2.5
<
=
VOUT
<
=
5.0 0.09 0.18
V
ISS Supply Current VIN−VOUT=1.0V, VCE=VIN 130 320
μA
Istandby Standby Current VIN−VOUT=1.0V, VCE=0V 0.1 2.0
μA
ΔVOUT/ΔVIN Line Regulation IOUT=200mA
RR Ripple Rejection f=1kHz, Ripple 0.5Vp-p Refer to the following table
VIN Input Voltage 2.1 6.0 V
ΔVOUT/
ΔTopt Output Voltage
Temperature Coefficient IOUT=10mA
−40°C
<
=
Topt
<
=
85°C ±100 ppm/°C
Ilim Short Current Limit VOUT=0V 200 mA
RPD Pull-down resistance
for CE pin 2.5 5.0 10.0
MΩ
VCEH CE Input Voltage "H" 1.2 VIN V
VCEL CE Input Voltage "L" 0 0.25 V
TTSD Thermal Shut down
Detector Threshold Temperature Junction Temperature 150 °C
TTSR Thermal Shut down
Released Temperature Junction Temperature 120 °C
• Line Regulation b y Output Voltage Topt=25°C
Line Regulation ΔVOUT/ΔVIN (%/V)
Output Voltage
VOUT (V) Condition Typ. Max.
1.5
<
=
VOUT < 1.6 IOUT=200mA, 2.1V
<
=
VIN
<
=
6.0V
1.6
<
=
VOUT
<
=
5.0 IOUT=200mA, VOUT+0.5V
<
=
VIN
<
=
6.0V 0.05 0.30
• Ripple Rejection b y Output Voltage Topt=25°C
Ripple Rejection RR (dB)
Output Voltage
VOUT (V) Condition Typ.
1.5
<
=
VOUT < 4.7 f=1kHz, Ripple 0.5Vp-p, VIN−VOUT=1.0V
4.7
<
=
VOUT
<
=
5.0 f=1kHz, Ripple 0.5Vp-p, VIN=5.75V 50
R1171x
7
• R1171Jxx1C
Topt=25°C
Symbol Item Conditions Min. Typ. Max. Unit
VOUT Output Voltage VIN−VOUT=1.0V
IOUT=200mA ×0.98 ×1.02 V
IOUT Output Current VIN−VOUT=1.0V 2.0 A
ΔVOUT/
ΔIOUT Load Regulation VIN−VOUT=1.0V
1mA
<
=
IOUT
<
=
300mA 10 60 mV
1.8
<
=
VOUT<2.0 0.12 0.24
2.0
<
=
VOUT<2.5 0.10 0.21
VDIF Dropout Voltage IOUT=300mA 2.5
<
=
VOUT
<
=
5.0 0.09 0.18
V
ISS Supply Current VIN−VOUT=1.0V, VCE=0V 130 320
μA
Istandby Standby Current VIN−VOUT =1.0V, VIN=VCE 0.1 2.0 μA
ΔVOUT/
ΔVIN Line Regulation IOUT=200mA
VOUT+0.5V
<
=
VIN
<
=
6V 0.05 0.30 %/V
RR Ripple Rejection f=1kHz, Ripple 0.5Vp-p Refer to the following table
VIN Input Voltage 2.1 6.0 V
ΔVOUT/
ΔTopt Output Voltage
Temperature Coefficient IOUT=10mA
−40°C
<
=
Topt
<
=
85°C ±100 ppm/°C
Ilim Short Current Limit VOUT=0V 200 mA
RPU Pull-up resistance for CE pin 2.5 5.0 10.0
MΩ
VCEH CE Input Voltage "H" 1.2 VIN V
VCEL CE Input Voltage "L" 0 0.25 V
TTSD Thermal Shut down
Detector Threshold
Temperature Junction Temperature 150 °C
TTSR Thermal Shut down
Released Temperature Junction Temperature 120 °C
• Ripple Rejection b y Output Voltage Topt=25°C
Ripple Rejection RR (dB)
Output Voltage
VOUT (V) Condition Typ.
1.8
<
=
VOUT < 4.7 f=1kHz, Ripple 0.5Vp-p, VIN−VOUT=1.0V
4.7
<
=
VOUT
<
=
5.0 f=1kHz, Ripple 0.5Vp-p, VIN=5.75V 50
R1171x
8
• R1171Jxx1D
Topt=25°C
Symbol Item Conditions Min. Typ. Max. Unit
VOUT Reference Voltage for
Adjustable Voltage Regulator VIN−VOUT=1.0V
IOUT=200mA ×0.98 ×1.02 V
IOUT Output Current VIN−VOUT=1.0V 2.0 A
ΔVOUT/
ΔIOUT Load Regulation VIN−VOUT=1.0V
1mA
<
=
IOUT
<
=
300mA 10 60 mV
1.8
<
=
VOUT<2.0 0.12 0.24
2.0
<
=
VOUT<2.5 0.10 0.21
VDIF Dropout Voltage IOUT=300mA 2.5
<
=
VOUT
<
=
5.0 0.09 0.18
V
ISS Supply Current VIN−VOUT=1.0V, VCE=VIN 130 320
μA
Istandby Standby Current VIN−VOUT=1.0V, VCE=0V 0.1 2.0
μA
ΔVOUT/
ΔVIN Line Regulation IOUT=200mA
VOUT+0.5V
<
=
VIN
<
=
6V 0.05 0.30 %/V
RR Ripple Rejection f=1kHz, Ripple 0.5Vp-p Refer to the following table
VIN Input Voltage 2.1 6.0 V
ΔVOUT/
ΔTopt Output Voltage
Temperature Coefficient IOUT=10mA
−40°C
<
=
Topt
<
=
85°C ±100 ppm/°C
Ilim Short Current Limit VOUT=0V 200 mA
RPD Pull-down resistance
for CE pin 2.5 5.0 10.0
MΩ
VCEH CE Input Voltage "H" 1.2 VIN V
VCEL CE Input Voltage "L" 0 0.25 V
TTSD Thermal Shut down
Detector Threshold
Temperature Junction Temperature 150 °C
TTSR Thermal Shut down
Released Temperature Junction Temperature 120 °C
• Ripple Rejection b y Output Voltage Topt=25°C
Ripple Rejection RR (dB)
Output Voltage
VOUT (V) Condition Typ.
1.8
<
=
VOUT < 4.7 f=1kHz, Ripple 0.5Vp-p, VIN−VOUT=1.0V
4.7
<
=
VOUT
<
=
5.0 f=1kHz, Ripple 0.5Vp-p, VIN=5.75V 50
R1171x
9
TEST CIRCUITS
IOUT
IN VDD V
OUT
CE
GND COUT
CIN
OUT
R1171xxx1B
Series
ISS
IN VDD VOUT
CE
GND COUT
CIN
OUT
R1171xxx1B
Series
Standard Test Circuit Supply Current Test Circuit
IOUT
IN VDD V
OUT
CE
GND COUT
OUT
R1171xxx1B
Series
P.G.
IN VDD VOUT
CE
GND
COUT
CIN
OUT
R1171xxx1B
Series
I1 I2
Test Circuit for Ripple Rejection, Test Circuit for Load Transient Response
Input Transient Response
R1171x
10
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current (Topt=25°C)
R1171S151x R1171S201x
0 2500 30001500 20001000500 3500
Output Current IOUT(mA)
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.8
1.6
Output Voltage V
OUT
(V)
VIN=2.5V
VIN=2.0V
VIN=3.5V
0 2500 30001500 20001000500 3500
Output Current IOUT(mA)
0
0.5
1.0
1.5
2.0
2.5
Output Voltage V
OUT
(V)
VIN=2.5V
VIN=4.0V
VIN=3.0V
R1171S301x R1171S501x
0 2500 30001500 20001000500 3500
Output Current IOUT(mA)
0
0.5
1.0
1.5
2.0
2.5
3.5
3.0
Output Voltage V
OUT
(V)
VIN=4.0V
VIN=3.5V
VIN=5.0V
0 2500 30001500 20001000500 3500
Output Current IOUT(mA)
0
1
2
3
4
5
6
Output Voltage V
OUT
(V)
VIN=5.5V
VIN=6.0V
R1171J181x R1171J501x
0 2500 30001500 20001000500 3500
Output Current
IOUT(mA)
Output Voltage V
OUT
(V)
V
IN
=2.3V
VIN=2.8V
VIN=3.8V
0
2.0
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
0 2500 30001500 20001000500 3500
Output Current
I
OUT
(mA)
0
1
2
3
4
5
6
Output Voltage V
OUT
(V)
V
IN
=5.5V
V
IN
=6.0V
R1171x
11
2) Output Voltage vs. Input Voltage (Topt=25°C)
R1171x151B R1171x201B
I
OUT
=1mA
I
OUT
=10mA
I
OUT
=100mA
I
OUT
=300mA
I
OUT
=500mA
145326
Input Voltage V
IN
(V)
1.2
1.3
1.4
1.5
1.6
1.7
1.8
Output Voltage V
OUT
(V)
I
OUT
=1mA
I
OUT
=10mA
I
OUT
=100mA
I
OUT
=300mA
I
OUT
=500mA
145326
Input Voltage V
IN
(V)
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
Output Voltage V
OUT
(V)
R1171x301B R1171x501B
I
OUT
=1mA
I
OUT
=10mA
I
OUT
=100mA
I
OUT
=300mA
I
OUT
=500mA
24536
Input Voltage V
IN
(V)
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
Output Voltage V
OUT
(V)
I
OUT
=1mA
I
OUT
=10mA
I
OUT
=300mA
I
OUT
=500mA
4.0 5.55.04.5 6.0
Input Voltage V
IN
(V)
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
Output Voltage V
OUT
(V)
3) Dropout Voltage vs. Output Current
R1171S151x R1171S201x
0 1250250 750 1000500 1500
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
85
°C
25
°C
-40
°C
0 1250250 750 1000500 1500
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
85
°C
25
°C
-40
°C
R1171x
12
R1171S301x R1171S501x
0 1250250 750 1000500 1500
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
85
°C
25
°C
-40
°C
0 1250250 750 1000500 1500
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
85
°C
25
°C
-40
°C
R1171J181x R1171J201x
0
175015001250250 750 1000500 2000
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
85
°C
25
°C
-40
°C
0
175015001250250 750 1000500 2000
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
85
°C
25
°C
-40
°C
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
R1171J301x R1171J501x
0
175015001250250 750 1000500 2000
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
85
°C
25
°C
-40
°C
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
0
175015001250250 750 1000500 2000
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
85
°C
25
°C
-40
°C
Output Current I
OUT
(mA)
Dropout Voltage V
DIF
(V)
R1171x
13
4) Output Voltage vs. Temperature
R1171x151B R1171x201B
-50 75-25 25 500 100
1.40
1.60
1.55
1.50
1.45
Temperature Topt(°C)
Output Voltage VOUT(V)
VIN=2.5V, IOUT=200mA
-50 75-25 25 500 100
1.90
2.10
2.05
2.00
1.95
Temperature Topt(°C)
Output Voltage VOUT(V)
VIN=3.0V, IOUT=200mA
R1171x301B R1171x501B
-50 75-25 25 500 100
2.80
3.20
3.10
3.00
3.15
3.05
2.90
2.85
2.95
Temperature Topt(°C)
Output Voltage VOUT(V)
VIN=4.0V, IOUT=200mA
-50 75-25 25 500 100
4.80
5.20
5.10
5.00
5.15
5.05
4.90
4.85
4.95
Temperature Topt(°C)
Output Voltage VOUT(V)
VIN=5.0V, IOUT=200mA
5) Supply Current vs. Input Voltage (Topt=25°C)
R1171x151B R1171x201B
01 45326
Input Voltage V
IN
(V)
0
100
50
150
200
250
300
350
Supply Current I
SS
(μA)
01 45326
Input Voltage V
IN
(V)
0
100
50
150
200
250
300
350
Supply Current I
SS
(μA)
R1171x
14
R1171x301B R1171x501B
01 45326
Input Voltage V
IN
(V)
0
100
50
150
200
250
300
350
Supply Current I
SS
(μA)
01 45326
Input Voltage V
IN
(V)
0
100
50
150
200
250
300
350
Supply Current I
SS
(μA)
6) Supply Current vs. Temperature
R1171x151B R1171x201B
V
IN
=2.5V
-50 -25 50 75250 100
Temperature Topt(°C)
0
100
50
150
200
250
300
350
Supply Current I
SS
(μA)
V
IN
=3.0V
-50 -25 50 75250 100
Temperature Topt(°C)
0
100
50
150
200
250
300
350
Supply Current I
SS
(μA)
R1171x301B R1171x501B
V
IN
=4.0V
-50 -25 50 75250 100
Temperature Topt(°C)
0
100
50
150
200
250
300
350
Supply Current I
SS
(μA)
V
IN
=6.0V
-50 -25 50 75250 100
Temperature Topt(°C)
0
100
50
150
200
250
300
350
Supply Current I
SS
(μA)
R1171x
15
7) Dropout Voltage vs. Set Output Voltage (Topt=25°C)
R1171Sxx1x R1171Jxx1x
I
OUT
=1500mA
I
OUT
=1000mA
I
OUT
=600mA
I
OUT
=200mA
14325
Set Output Voltage V
SET
(V)
0
0.3
0.2
0.1
0.4
0.5
0.6
0.7
0.8
Dropout Voltage V
DIF
(V)
I
OUT
=2000mA
I
OUT
=1000mA
I
OUT
=400mA
I
OUT
=200mA
14325
Set Output Voltage V
SET
(V)
0
0.3
0.2
0.1
0.4
0.5
0.6
0.7
0.8
Dropout Voltage V
DIF
(V)
8) Ripple Rejection vs. Frequency
R1171x151B R1171x201B
IOUT=1mA
IOUT=10mA
IOUT=100mA
IOUT=200mA
IOUT=500mA
0.1 10.01.0 100.0
0
80
60
70
40
50
20
30
10
Ripple Frequency f(kHz)
Ripple Rejection RR(dB)
VIN=2.5V+0.5Vp-p
IOUT=1mA
IOUT=10mA
IOUT=100mA
IOUT=200mA
IOUT=500mA
0.1 10.01.0 100.0
0
80
60
70
40
50
20
30
10
Ripple Frequency f(kHz)
Ripple Rejection RR(dB)
VIN=3.0V+0.5Vp-p
R1171x301B R1171x501B
IOUT=1mA
IOUT=10mA
IOUT=100mA
IOUT=200mA
IOUT=500mA
0.1 10.01.0 100.0
0
80
60
70
40
50
20
30
10
Ripple Frequency f(kHz)
Ripple Rejection RR(dB)
VIN=4.0V+0.5Vp-p
IOUT=1mA
IOUT=10mA
IOUT=100mA
IOUT=200mA
IOUT=500mA
0.1 10.01.0 100.0
0
80
60
70
40
50
20
30
10
Ripple Frequency f(kHz)
Ripple Rejection RR(dB)
VIN=5.75V+0.5Vp-p
R1171x
16
9) Ripple Rejection vs. Input Voltage
R1171x301x R1171x301x
3.1 3.43.33.2 3.5
0
80
60
70
40
50
20
30
10
Input Voltage VIN(V)
Ripple Rejection RR(dB)
IOUT=1mA,COUT=4.7μF
f=400Hz
f=1kHz
f=10kHz
3.1 3.43.33.2 3.5
0
80
60
70
40
50
20
30
10
Input Voltage VIN(V)
Ripple Rejection RR(dB)
IOUT=10mA,COUT=4.7μF
f=400Hz
f=1kHz
f=10kHz
R1171x301x R1171x301x
3.1 3.43.33.2 3.5
0
80
60
70
40
50
20
30
10
Input Voltage VIN(V)
Ripple Rejection RR(dB)
IOUT=100mA,COUT=4.7μF
f=400Hz
f=1kHz
f=10kHz
3.1 3.43.33.2 3.5
0
80
60
70
40
50
20
30
10
Input Voltage VIN(V)
Ripple Rejection RR(dB)
IOUT=300mA,COUT=4.7μF
f=400Hz
f=1kHz
f=10kHz
R1171x301x
3.1 3.43.33.2 3.5
0
80
60
70
40
50
20
30
10
Input Voltage VIN(V)
Ripple Rejection RR(dB)
IOUT=500mA,COUT=4.7μF
f=400Hz
f=1kHz
f=10kHz
R1171x
17
10) Input Transient Response (Topt=25°C)
R1171x151B
080604020 180160140120100 200
Time t(μs)
Output Voltage V
OUT
(V)
Input Voltage V
IN
(V)
1.40
1.50
1.45
1.55
1.60
1.65
1.75
1.70
1.80
0
1.0
0.5
1.5
2.0
2.5
3.5
3.0
4.0
Input Voltage
Output Voltage
tr=tf=5
μ
s, I
OUT
=1000mA, C
OUT
=Ceramic 10
μ
F
R1171x201B
080604020 180160140120100 200
Time t(μs)
Output Voltage V
OUT
(V)
Input Voltage V
IN
(V)
1.90
2.00
1.95
2.05
2.10
2.15
2.25
2.20
2.30
0.5
1.5
1.0
2.0
2.5
3.0
4.0
3.5
4.5
Input Voltage
Output Voltage
tr=tf=5
μ
s, I
OUT
=1000mA, C
OUT
=Ceramic 4.7
μ
F
R1171x301B
080604020 180160140120100 200
Time t(μs)
Output Voltage V
OUT
(V)
Input Voltage V
IN
(V)
2.90
2.95
3.00
3.05
3.15
3.10
3.20
1.0
1.5
2.5
2.0
3.0
3.5
4.0
5.0
4.5
5.5
Input Voltage
Output Voltage
tr=tf=5
μ
s, I
OUT
=1000mA, C
OUT
=Ceramic 4.7
μ
F
R1171x
18
R1171x501B
080604020 180160140120100 200
Time t(μs)
Output Voltage V
OUT
(V)
Input Voltage V
IN
(V)
4.90
5.00
4.95
5.05
5.10
5.15
5.25
5.20
5.30
3.5
4.5
4.0
5.0
5.5
6.0
7.0
6.5
7.5
Input Voltage
Output Voltage
tr=tf=5
μ
s, I
OUT
=1000mA, C
OUT
=Ceramic 4.7
μ
F
11) Load Transient Response (Topt=25°C)
R1171x151B
080604020 180160140120100 200
Time t(μs)
Output Voltage V
OUT
(V)
Output Current I
OUT
(mA)
1.35
1.55
1.50
1.45
1.40
1.60
1.65
1.70
1.80
1.75
1.85
0
1500
500
1000
2000
Output Current
Output Voltage
tr=tf=10
μ
s, V
IN
=2.5V, C
OUT
=Ceramic 10
μ
F
R1171x201B
080604020 180160140120100 200
Time t(μs)
Output Voltage V
OUT
(V)
Output Current I
OUT
(mA)
1.85
2.05
2.00
1.95
1.90
2.10
2.15
2.20
2.30
2.25
2.35
0
1500
500
1000
2000
Output Current
Output Voltage
tr=tf=10
μ
s, V
IN
=3.0V, C
OUT
=Ceramic 4.7
μ
F
R1171x
19
R1171x301B
080604020 180160140120100 200
Time t(μs)
Output Voltage V
OUT
(V)
Output Current I
OUT
(mA)
2.85
3.05
3.00
2.95
2.90
3.10
3.15
3.20
3.30
3.25
3.35
0
1500
500
1000
2000
Output Current
Output Voltage
tr=tf=10
μ
s, V
IN
=4.0V, C
OUT
=Ceramic 4.7
μ
F
R1171x501B
080604020 180160140120100 200
Time t(μs)
Output Voltage V
OUT
(V)
Output Current I
OUT
(mA)
4.85
5.05
5.00
4.95
4.90
5.10
5.15
5.20
5.30
5.25
5.35
0
1500
500
1000
2000
Output Current
Output Voltage
tr=tf=10
μ
s, V
IN
=6.0V, C
OUT
=Ceramic 4.7
μ
F
R1171x
20
Technical Notes on External Components and Typical Application
1. Phase Compensation
In these ICs, phase compensation is made with the output capacitor for securing stable operation even if the
load current is varied. For this purpose, use a capacitor with the capacitance range from 4.7μF to 10.0μF, as CL.
In case that using a tantalum capacitor and the ESR of the tantalum capacitor is too large, unstable operation
may result. Fully evaluation is necessary for the whole circuit with con sid ering the frequency characteristic.
2. Mounting on PCB
Make VDD and GND lines sufficient. If their impedance is high, large current may flow and the pick-up noise or
unstable operation may result. Therefore use a capacitor with a capacitance range from 4.7μF to 10.0μF
between VDD pin and GND pin as close as possible.
Further, set an output capacitor bet ween VOUT pin and GND pin for phase compensation as close as possible.
(Refer to the example of typical application)
IN
VDD V
OUT
CE
GND
CL
CI
OUT
R1171xxx1B
R1171Sxx1B Typical Application
1.5V
<
=
VOUT<1.8V : CI=10μF (Ceramic),CL=10μF (Ceramic)
1.8V
<
=
VOUT
<
=
5.0V : CI=4.7μF (Ceramic),CL=4.7μF (Ceramic)
3. Output Short Protection Function
In the R1171x Series, the output short protection function is built in, further, if the output is short to the GND or
other voltage line, the chip inside is heating, as a result, in case that the junction temperature becomes equal or
more than 150°C (Typ.), the built-in thermal shutdown circuit works. If the junction temperature becomes equal
or more than 150°C (Typ.), the IC is protected by the output short protection circuit and the thermal shutdown
circuit.
R1171x
21
ESR vs. Output Current (Topt=25°C, VIN=Set Output Voltage+1V, CIN=Ceramic 10μF)
VIN CIN
VOUT
CE
R1171xxx1B COUT Spectrum
A
nalyzer
IOUT
ESR
VIN S.A
GND
As an output capacitor for this IC, Ceramic capacitor is recommendable. However, other low ESR type
capacitor can be used with this IC.
For your reference, noise level is tested with the circuit as shown above, and if the noise level is 40μV or less
than 40μV, the ESR values are plotted as st able area. Upper limit i s described in the next four graphs, or ESR vs.
Output Current. (Hatched area is the stable area.)
R1171S151x R1171S151x
0 250 500 750 1000 1250 1500
Output Current I
OUT
(mA)
0.01
100
1
0.1
10
ESR(Ω)
C
IN
=C
OUT
=Ceramic 10μF
0 250 500 750 1000 1250 1500
Output Current I
OUT
(mA)
0.01
100
1
0.1
10
ESR(Ω)
C
IN
=C
OUT
=Ceramic 4.7μF
R1171x
22
R1171S301x R1171S301x
0 250 500 750 1000 1250 1500
Output Current I
OUT
(mA)
0.01
100
1
0.1
10
ESR(Ω)
C
IN
=C
OUT
=Ceramic 4.7μF
0 250 500 750 1000 1250 1500
Output Current I
OUT
(mA)
0.01
100
1
0.1
10
ESR(Ω)
C
IN
=C
OUT
=Ceramic 2.2μF
R1171S501x R1171S501x
0 250 500 750 1000 1250 1500
Output Current I
OUT
(mA)
0.01
100
1
0.1
10
ESR(Ω)
C
IN
=C
OUT
=Ceramic 4.7μF
0 250 500 750 1000 1250 1500
Output Current I
OUT
(mA)
0.01
100
1
0.1
10
ESR(Ω)
C
IN
=C
OUT
=Ceramic 2.2μF
R1171J181x R1171J181x
0
250 500 750 1000 1250 1500 1750 2000
0.01
100
1
0.1
10
C
IN
=C
OUT
=Ceramic 4.7μF
Output Current I
OUT
(mA)
ESR(Ω)
0
250 500 750 1000 1250 1500 1750 2000
0.01
100
1
0.1
10
C
IN
=C
OUT
=Ceramic 2.2μF
Output Current I
OUT
(mA)
ESR(Ω)
R1171x
23
R1171J301x R1171J301x
0
250 500 750 1000 1250 1500 1750 2000
0.01
100
1
0.1
10
C
IN
=C
OUT
=Ceramic 4.7μF
Output Current I
OUT
(mA)
ESR(Ω)
0
250 500 750 1000 1250 1500 1750 2000
0.01
100
1
0.1
10
C
IN
=C
OUT
=Ceramic 2.2μF
Output Current I
OUT
(mA)
ESR(Ω)
R1171J501x R1171J501x
0
250 500 750 1000 1250 1500 1750 2000
0.01
100
1
0.1
10
C
IN
=C
OUT
=Ceramic 4.7μF
Output Current I
OUT
(mA)
ESR(Ω)
0
250 500 750 1000 1250 1500 1750 2000
0.01
100
1
0.1
10
C
IN
=C
OUT
=Ceramic 2.2μF
Output Current I
OUT
(mA)
ESR(Ω)
