R1141Q_E/2004/01/07
SC-82 120mA LDO REGULATOR
R1141Q SERIES
OUTLINE
The R1141Q Series consist of CMOS-based voltage regulator ICs with high output voltage accuracy, low
supply current, low ON-resistance, and high ripple rejection. 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.
Output Current Limit circuit is embedded in the R1141Q Series to prevent the break down of the IC
caused by excess current.
Chip enable circuit realizes standby mode and makes consumption current extremely small.
These ICs perform with low dropout voltage and a chip enable function. The line transient response and
load transient response of the R1141Q Series are excellent, making these ICs very suitable for the power
supply for hand-held communication equipment.
Their output voltage is internally fixed with high accuracy. Since the package for these ICs is SC-82AB
(Super Mini-mold) package, high density mounting of the ICs on boards is possible.
FEATURES
•
Ultra-Low Supply Current ................................... Typ. 90µA
•
Standby Mode ..................................................... Typ. 0.1µA
•
Low Dropout Voltage ........................................... Typ.0.15V (IOUT=100mA Output Voltage=3.0V Type)
•
High Ripple Rejection .......................................... Typ. 75dB (V
OUT
≤2.4V),
70dB (V
OUT
≥2.5V)
(f=1kHz)
•
Low Temperature-Drift Coefficient of Output Voltage½½½Typ. ±100ppm/°C
•
Excellent Line Regulation .................................... Typ. 0.02%/V
•
High Output Voltage Accuracy............................. ±1.5% or ±30mV (V
OUT
≤2.0V)
•
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 (Short Current)
•
Ceramic capacitor can be used for Output pin ..... Recommended value is 2.2µF or more.
APPLICATIONS
•
Power source for cellular phones such as GSM, CDMA and various kinds of PCS.
•
Power source for electrical appliances such as cameras, VCRs, camcorders, and hand-held communica-
tion equipment.
•
Power source for battery-powered equipment.
•
Very stable Voltage Reference
1
R1141Q
BLOCK DIAGRAM
R1141Qxx1B
R1141Qxx1D
V
DD
4
-
+
Vref
Current Limit
CE 3
1 V
OUT
V
DD
4
-
+
Vref
Current Limit
1 V
OUT
2 GND
CE 3
2 GND
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 with designating the part number as shown below;
R1141Qxx1x-xx
↑↑ ↑ ↑
ab c d
←Part
Number
Code
a
b
Designation of Package Type :
Q:SC82-AB (Super Mini-mold)
Setting Output Voltage (V
OUT
) :
Contents
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 auto discharge function at OFF state.
D: With auto discharge function at OFF state.
Designation of Taping Type :
Ex. TR, TL (refer to Taping Specifications; TR type is the standard direction.)
c
d
2
R1141Q
•
ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE
Topt = 25°C
Dropout Voltage
Output Voltage
V
OUT
(V)
Condition
V
OUT
= 1.5
V
OUT
= 1.6
V
OUT
= 1.7
1.8
≤
V
OUT
≤
2.0
2.1
≤
V
OUT
≤
2.7
2.8
≤
V
OUT
≤
4.0
I
OUT
= 120mA
Typ.
0.36
0.32
0.30
0.28
0.24
0.18
Max.
0.70
0.60
0.50
0.40
0.35
0.28
V
DIF
(V)
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 2.2µF 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 V
DD
and GND lines sufficient. When their impedance is high, picking up the noise or unstable
operation may result. Connect a capacitor with as much as 1.0µF 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 as
short as possible.
5
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