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R1131D181B Schematic ( PDF Datasheet ) - RICOH

Teilenummer R1131D181B
Beschreibung Low Voltage 300mA LDO REGULATOR
Hersteller RICOH
Logo RICOH Logo 




Gesamt 30 Seiten
R1131D181B Datasheet, Funktion
R1131x SERIES
Low Voltage 300mA LDO REGULATOR
NO.EA-116-061102
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,
www.DataSheeta4nU.ceormror 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
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)
Ripple Rejection................................................Typ. 65dB(f=1kHz)
Low Temperature-Drift Coefficient of Output Voltage Typ. ±100ppm/°C
Excellent Line Regulation .................................Typ. 0.01%/V
Output Voltage Accuracy...................................±2.0%
Packages .........................................................SOT-23-5, SON-6, HSON-6
Output Voltage Range.......................................0.8V to 3.3V
Input Voltage Range .........................................1.4V to 3.3V
Built-in fold-back protection circuit ....................Typ. 50mA (Current at short mode)
External Capacitors...........................................CIN=COUT=Tantalum 1.0µF (VOUT < 1.0V)
CIN=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.
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R1131D181B Datasheet, Funktion
R1131x
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).
www.DataShee(t4NUo.cteom: 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
IN
C1
VDD OUT
R1131x
Series
GND
OUT
C2
CE CE
<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
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R1131D181B pdf, datenblatt
R1131x
0.40
0.35
0.30
0.25
0.20
0.15
www.DataSheet4U.co0m.10
0.05
00
R1131x26xx
85°C
25°C
-40°C
50 100 150 200 250 300
Output Current IOUT(mA)
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
00
R1131x33xx
85°C
25°C
-40°C
50 100 150 200 250 300
Output Current IOUT(mA)
7) Dropout Voltage vs. Set Output Voltage (Topt=25°C)
R1131xxx1x
0.80
0.70
0.60
0.50
0.40
IOUT=10mA
30mA
50mA
100mA
200mA
300mA
0.30
0.20
0.10
0
0.5
1 1.5 2 2.5 3
Set Output Voltage VREG(V)
3.5
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)
80 80
70 70
60 60
50 50
40 40
30
20
10
0
2.6
f = 400Hz
f = 1kHz
f = 10kHz
f = 100kHz
2.7 2.8 2.9 3.0 3.1 3.2
Input Voltage VIN(V)
30
20
10
0
2.6
f = 400Hz
f = 1kHz
f = 10kHz
f = 100kHz
2.7 2.8 2.9 3.0 3.1 3.2
Input Voltage VIN(V)
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