R1112N451A
| Model | R1112N451A |
| Description | Fixed Positive LDO Regulator, 4.5V, 0.26V Dropout, CMOS, PDSO5, MINI, PLASTIC, SOT-23, 5 PIN |
| PDF file | Total 22 pages (File size: 294K) |
| Chip Manufacturer | RICOH |
'2000.3.13
LOW NOISE 150mA LDO REGULATOR
R1112N SERIES
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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.
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FEATURES
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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
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APPLICATIONS
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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-
