'2000.3.13
LOW NOISE 150mA LDO REGULATOR
R1112N SERIES
n
OUTLINE
The R1112N 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 R1112N 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.
n
FEATURES
l
l
l
l
l
l
l
l
l
l
l
l
l
l
Ultra-Low Supply Current......................................... TYP. 100mA
Standby Mode ........................................................... TYP. 0.1mA
Low Dropout Voltage ................................................ TYP. 0.19V(I
OUT
=100mA 3.0V Output type)
High Ripple Rejection ............................................... TYP. 80dB(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 ..........................................................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 low , B: active high)
Pin-out .......................................................................Similar to the LP2980/LP2985
Built-in fold-back protection circuit ..........................TYP. 30mA (Current at short mode)
Ceramic capacitors recommended to be used with this IC
n
APPLICATIONS
l
l
l
Power source for cellular phones such as GSM, CDMA and various kind of PCSs.
Power source for electrical appliances such as cameras, VCRs and camcorders.
Power source for battery-powered equipment.
Rev. 1.10
-1-
n
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 :
R1112XXX1X-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 5.0V is possible.
Designation of Active Type :
A : active low type
B : active high type
Designation of Taping Type :
Ex. TR, TL (refer to Taping Specifications ;TR type is the standard direction.)
n
PIN CONFIGURATION
SOT-23-5
5
4
V
OUT
(mark side)
V
DD
GND
NC
CE
1
2
3
n
PIN DESCRIPTION
Pin No.
1
2
3
4
5
V
DD
GND
CE or CE
NC
V
OUT
Symbol
Input Pin
Ground Pin
Chip Enable Pin
No Connection
Output pin
Description
Rev. 1.10
-3-
Analogue and Mixed Signal
京公网安备 11010802033920号
EEWORLD
