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Datasheet: R1121N181A (RICOH electronics devices division)

Low Noise 150ma Ldo Regulator

 

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RICOH electronics devices division
'99.7.13
LOW NOISE 150mA LDO REGULATOR
R1121N SERIES
Rev.1.11
- 1 -
s
OUTLINE
The R1121N Series are voltage regulator ICs with high output voltage accuracy, extremely 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, 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 R1121N 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 fixed with high accuracy.
Since the package for these ICs are SOT-23-5 (Mini-mold) package, high density mounting of the ICs on boards is possible.
s
FEATURES
Ultra-Low Supply Current.................................................TYP. 35
A
Standby Mode ...................................................................TYP. 0.1
A
Low Dropout Voltage ........................................................TYP. 0.2V (I
OUT
= 100mA)
High Ripple Rejection .......................................................TYP. 70db (f = 1kHz)
Low Temperature-Drift Coefficient of Output Voltage .....TYP.
100ppm/
C
Excellent Line Regulation .................................................TYP. 0.05%/V
High Accuracy Output Voltage..........................................
2.0%
Small Package ..................................................................SOT-23-5 (Mini-mold)
Output Voltage ..................................................................Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V
is possible.
Built-in chip enable circuit (2 Types; A: active "L", B: active "H")
Pinout ................................................................................Similar to the TK112, TK111
s
APPLICATIONS
Power source for cellular phones such as GSM, CDMA and various kind of PCSs.
Power source for domestic appliances such as cameras, VCRs and camcorders.
Power source for battery-powered equipment.
s
BLOCK DIAGRAM
R1121NXX1A
R1121NXX1B
Vref
Current Limit
V
DD
3
1
2
4
V
OUT
GND
CE
Vref
Current Limit
V
DD
3
1
2
4
V
OUT
GND
CE
Rev.1.11
- 2 -
s
SELECTION GUIDE
The output voltage, the active type, the packing type, 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 :
R1121XXX1X-XX
Part Number
a b
c
Code
Contents
a
Setting Output Voltage (V
OUT
) :
Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V is possible.
b
Designation of Active Type :
A : active "L" type
B : active "H" type
c
Designation of Taping Type :
Ex. TR, TL (refer to Taping Specifications; TR type is the standard direction.)
s
PIN CONFIGURATION
SOT-23-5
5
4
NC
CE
(mark side)
1
2
3
V
OUT
GND
V
DD
s
PIN DESCRIPTION
Pin No.
Symbol
Description
1
V
OUT
Output pin
2
GND
Ground Pin
3
V
DD
Input Pin
4
CE or CE
Chip Enable Pin
5
NC
No Connection
Rev.1.11
- 3 -
s
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Rating
Unit
V
IN
Input Voltage
9
V
V
CE
Input Voltage (CE or CE Pin)
-0.3 ~ V
IN
+0.3
V
V
OUT
Output Voltage
-0.3~ V
IN
+0.3
V
P
D
Power Dissipation
250
mW
Topt
Operating Temperature
Range
-40 ~ 85
C
Tstg
Storage Temperature Range
-55 ~ 125
C
s
ELECTRICAL CHARACTERISTICS
q
R1121NXX1A
Topt = 25
C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
OUT
Output Voltage
V
IN
= Set V
OUT
+1V
1mA
I
OUT
30mA
V
OUT
0.98
V
OUT
1.02
V
I
OUT
Output Current
refer to the ELECTRICAL CHARACTERISTICS by OUTPUT
VOLTAGE
V
OUT
/
I
OUT
Load Regulation
V
IN
= Set V
OUT
+1V
1mA
I
OUT
80mA
12
40
mV
V
DIF
Dropout Voltage
refer to the ELECTRICAL CHARACTERISTICS by OUTPUT
VOLTAGE
I
SS
Supply Current
V
IN
= Set V
OUT
+1V
35
70
A
Istandby
Supply Current (Standby)
V
IN
= V
CE
= Set V
OUT
+1V
0.1
1.0
A
V
OUT
/
V
IN
Line Regulation
Set V
OUT
+0.5V
V
IN
8V
I
OUT
= 30mA
0.05
0.20
%/V
RR
Ripple Rejection
f = 1KHz, Ripple 0.5Vp-p
V
IN
= Set V
OUT
+1V
70
dB
V
IN
Input Voltage
8
V
V
OUT
/
T
Output Voltage
Temperature Coefficient
I
OUT
= 30mA
-40
C
Topt
85
C
100
ppm
/
C
Ilim
Short Current Limit
V
OUT
= 0V
50
mA
R
PU
CE Pull-up Resistance
2.5
5
10
M
V
CEH
CE Input Voltage "H"
1.5
V
IN
V
V
CEL
CE Input Voltage "L"
0
0.25
V
en
Output Noise
BW = 10Hz ~ 100kHz
30
Vrms
Rev.1.11
- 4 -
q
R1121NXX1B
Topt=25
C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
OUT
Output Voltage
V
IN
= Set V
OUT
+1V
1mA
I
OUT
30mA
V
OUT
0.98
V
OUT
1.02
V
I
OUT
Output Current
refer to the ELECTRICAL CHARACTERISTICS by OUTPUT
VOLTAGE
V
OUT
/
I
OUT
Load Regulation
V
IN
= Set V
OUT
+1V
1mA
I
OUT
80mA
12
40
mV
V
DIF
Dropout Voltage
refer to the ELECTRICAL CHARACTERISTICS by OUTPUT
VOLTAGE
I
SS
Supply Current
V
IN
= Set V
OUT
+1V
35
70
A
Istandby
Supply Current (Standby)
V
IN
= Set V
OUT
+1V
V
CE
= GND
0.1
1.0
A
V
OUT
/
V
IN
Line Regulation
Set V
OUT
+0.5V
V
IN
8V
I
OUT
= 30mA
0.05
0.20
%/V
RR
Ripple Rejection
f = 1KHz, Ripple 0.5Vp-p
V
IN
= Set V
OUT
+1V
70
dB
V
IN
Input Voltage
8
V
V
OUT
/
T
Output Voltage
Temperature Coefficient
I
OUT
= 30mA
-40
C
Topt
85
C
100
ppm
/
C
Ilim
Short Current Limit
V
OUT
= 0V
50
mA
R
PD
CE Pull-down Resistance
2.5
5
10
M
V
CEH
CE Input Voltage "H"
1.5
V
IN
V
V
CEL
CE Input Voltage "L"
0
0.25
V
en
Output Noise
BW = 10Hz ~ 100kHz
30
Vrms
q
ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE
Topt = 25
C
Output Current
I
OUT
(mA)
Output Voltage
V
OUT
(V)
Conditions
MIN.
1.5
V
OUT
1.7
100
1.8
V
OUT
5.0
V
IN
- V
OUT
= 1.0V
150
Topt = 25
C
Dropout Voltage
V
DIF
(V)
Output Voltage
V
OUT
(V)
Conditions
MIN.
TYP.
MAX.
1.5
0.5
1.6
0.4
1.7
0.3
1.8
V
OUT
1.9
0.60
1.40
2.0
V
OUT
2.4
0.35
0.70
2.5
V
OUT
2.7
0.24
0.35
2.8
V
OUT
3.3
0.20
0.30
3.4
V
OUT
5.0
I
OUT
= 100mA
0.17
0.26
Note :When set Output Voltage is equal or less than 2.0V, VIN should be
equal or more than 2.0V.
Rev.1.11
- 5 -
s
OPERATION
R1121NXX1A
R1121NXX1B
V
DD
3
1
2
4
V
OUT
GND
R2
R1
CE
Current Limit
Vref
V
DD
3
1
2
4
V
OUT
GND
R2
R1
CE
Current Limit
Vref
In these ICs, fluctuation of Output Voltage, V
OUT
is detected by Feed-back Registers, R1 and R2, and the result is compared
with a reference voltage by Error Amplifier, so that a constant voltage is output.
A current limit circuit for protection at short mode and a chip enable circuit are included.
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