PRELIMINARY
SC82 120mA LDO REGULATOR
'2000.7.19
R1140Q SERIES
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OUTLINE
The R1140Q Series are voltage regulator ICs with high output voltage accuracy, low supply current, low ON-resistance, and
high ripple rejection by CMOS process. 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.
These ICs perform with low dropout voltage and a chip enable function. The line transient response and load transient
response of the R1140Q Series are excellent, thus these ICs are very suitable for the power supply for hand-held
communication equipment.
The output voltage of these ICs is internally fixed with high accuracy. Since the package for these ICs are SC-82AB (Super
Mini-mold) package, high density mounting of the ICs on boards is possible.
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FEATURES
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Ultra-Low Supply Current......................................... TYP. 75mA
Standby Mode ........................................................... TYP. 0.1mA
Low Dropout Voltage ................................................ TYP. 0.15V(I
OUT
=100mA Output Voltage=3.0V Type)
High Ripple Rejection ............................................... TYP. 75dB(f=1kHz)
Low Temperature-Drift Coefficient of Output Voltage TYP. ±100ppm/°C
Excellent Line Regulation ......................................... TYP. 0.05%/V
High Output Voltage Accuracy.................................. ±2.0%
Excellent Dynamic Response
Small Package ..........................................................SC-82AB(Super Mini-mold)
Output Voltage...........................................................Stepwise setting with a step of 0.1V in the range of 1.5V to 4.0V is
possible
Built-in chip enable circuit (B/D: active high)
Built-in fold-back protection circuit ..........................TYP. 40mA (Current at short mode)
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APPLICATIONS
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Power source for cellular phones such as GSM, CDMA and various kinds of PCS.
Power source for electrical appliances such as cameras, VCRs and camcorders.
Power source for battery-powered equipment.
Rev. 1.00
-1-
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BLOCK DIAGRAM
R1140QXX1B
R1140QXX1D
V
OUT
4
V
DD
Vref
Current Limit
1
-
+
GND
4
V
DD
Vref
Current Limit
1
-
+
GND
V
OUT
CE
3
2
CE
3
2
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SELECTION GUIDE
The output voltage, mask option, and the taping type for the ICs can be selected at the user's request. The selection can be made
by designating the part number as shown below;
R1140QXX1X-XX
¬Part
Number
- - - -
a b c d
Code
a
b
c
d
Contents
Designation of Package Type :
N:SOT-23-5 (Mini-mold)
Setting Output Voltage (V
OUT
) :
Stepwise setting with a step of 0.1V in the range of 1.5V to 4.0V is possible.
Designation of Mask Option :
B: Without Nch Tr. for discharge at OFF state.
D: With Nch Tr. for discharge at OFF state.
Designation of Taping Type :
Ex. TR, TL (refer to Taping Specifications; TR type is the standard direction.)
Rev. 1.00
-2-
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PIN CONFIGURATION
SC-82AB
4
3
Mark side
1
2
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PIN DESCRIPTION
Pin No.
1
2
3
4
Symbol
V
OUT
GND
CE
V
DD
Description
Output pin
Ground Pin
Chip Enable Pin
Input Pin
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ABSOLUTE MAXIMUM RATINGS
Item
Input Voltage
Input Voltage(CE Pin)
Output Voltage
Output Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Symbol
V
IN
V
CE
V
OUT
I
OUT
P
D
Topt
Tstg
Rating
6.5
-0.3 ~ V
IN
+0.3
-0.3 ~ V
IN
+0.3
140
150
-40 ~ 85
-55 ~ 125
Unit
V
V
V
mA
mW
°C
°C
Rev. 1.00
-3-
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ELECTRICAL CHARACTERISTICS
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R1140QXX1B/R1140QXX1D
Symbol
Item
V
OUT
I
OUT
DV
OUT
/DI
OUT
V
DIF
I
SS
Istandby
DV
OUT
/DV
IN
Output Voltage
Output Current
Load Regulation
Dropout Voltage
Supply Current
Supply Current (Standby)
Line Regulation
Conditions
MIN.
TYP.
V
IN
= Set V
OUT
+1V
V
OUT
1mA
£
I
OUT
£
30mA
´0.98
V
IN
- V
OUT
= 1.0V
120
V
IN
= Set V
OUT
+1V
12
40
mV
1mA
£
I
OUT
£
120mA
Refer to the ELECTRICAL CHARACTERISTICS by OUTPUT
VOLTAGE
V
IN
= Set V
OUT
+1V
75
150
mA
V
IN
= V
CE
= Set V
OUT
+1V
0.1
1.0
mA
Set V
OUT
+0.5V
£
V
IN
£
6V
I
OUT
= 30mA
0.05
0.20
%/V
(In case that V
OUT
£1.6V,
2.2V£ V
IN
£
6V)
f = 1kHz, Ripple 0.5Vp-p
75
dB
V
IN
= Set V
OUT
+1V,
I
OUT
= 30mA
2.2
6.0
V
ppm
I
OUT
= 30mA
±100
/°C
-40°C
£
Topt
£
85°C
V
OUT
= 0V
40
mA
1.5
4
16
MW
V
1.5
V
IN
0.0
0.3
V
BW=10Hz to 100kHz
30
mVrms
V
CE
=0V
70
W
Topt=25°C
MAX.
Unit
V
OUT
V
´1.02
mA
RR
V
IN
DV
OUT
/DT
Ilim
R
PU
V
CEH
V
CEL
e
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R
LOW
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Ripple Rejection
Input Voltage
Output Voltage
Temperature Coefficient
Short Current Limit
CE Pull-up Resistance
CE Input Voltage “H”
CE Input Voltage “L”
Output Noise
Low Output Nch Tr. ON
Resistance (of D version)
ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE
Topt = 25°C
Output Voltage
V
OUT
(V)
1.5
£
V
OUT
£
1.6
1.7
£
V
OUT
£
1.8
1.9
£
V
OUT
£
2.0
2.1
£
V
OUT
£
2.7
2.8
£
V
OUT
£
4.0
Dropout Voltage
V
DIF
(V)
Condition
TYP.
0.36
0.30
I
OUT
= 120mA
0.28
0.24
0.18
MAX.
0.70
0.50
0.45
0.40
0.30
Rev. 1.00
-4-
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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 2.2mF or more capacitor C
OUT
with good frequency characteristics and ESR (Equivalent Series Resistance).
(Note: When the additional ceramic capacitors are connected to the Output Pin with Output capacitor for phase compensation,
the operation might be unstable. Because of this, test these ICs with as same external components as ones to be used on the
PCB.)
PCB Layout
Make VDD and GND line sufficient. When the impedance of these is high, it would be a cause of picking up the noise or
unstable operation. Connect a capacitor with as much as 1.0mF capacitor between V
DD
and GND pin as close as possible.
Set external components, especially output capacitor as close as possible to the ICs and make wiring shortest.
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TEST CIRCUITS
1
V
OUT
I
OUT
V
OUT
V
C2
V
DD
R1140Q
SERIES
4
2
GND
CE
3
C1
*
Fig.1 Standard test Circuit
C1 = Tantal1.0mF
C2 = Tantal2.2mF
1
V
OUT
C2
V
DD
R1140Q
SERIES
CE
4
A
3
C1
I
SS
2
GND
*
C1 = Tantal1.0mF
C2 = Tantal2.2mF
Fig.2 Supply Current Test Circuit
Rev. 1.00
-5-
