RICOH R1121N SERIES Owner's Manual User Guide
Summary
Designed for high-reliability power management, this low-noise CMOS LDO voltage regulator provides stable, accurate current for portable electronics. Ideal for communication gear (e.g., cell phones) and battery-powered devices like cameras due to its excellent transient response and minimal ripple noise. This resource details the R1121N's complete electrical characteristics, operational ratings, and application guidelines, providing engineers with all necessary data to implement reliable power solutions in space-constrained SOT-23-5 packages.
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R1121N SERIES
LOW NOISE 150m A LDO REGULATOR
NO.EA-058-111026
OUTLINE The R1121N Series are CMOS-based voltage regulator ICs with high output voltage accuracy, extremely 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, 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 is SOT-23-5 (Mini-mold) package , high density mounting of the ICs on boards is possible.
FEATURES • Supply Current ................................................................Typ. 35μA • Standby Mode .................................................................Typ. 0.1μA • Dropout Voltage ..............................................................Typ. 0.2V (IOUT=100m A) • Ripple Rejection..............................................................Typ. 70d B(f=1k Hz) • Temperature-Drift Coefficient of Output Voltage .............Typ. ±100ppm/°C • Line Regulation ...............................................................Typ. 0.05%/V • Output Voltage Accuracy.................................................±2.0% • Output Voltage Range.....................................................1.5V to 5.0V (0.1V steps) (For other voltages, please refer to MARK INFORMATIONS.) • Package ........................................................................SOT-23-5 (Mini-mold) • Built-in chip enable circuit ( 2 types; A: active “L”, B: active “H”) • Pin-out.............................................................................Similar to the TK112,TK111
APPLICATIONS • Power source for cellular phones such as GSM, CDMA and various kinds of PCSs. • Power source for domestic appliances such as cameras, VCRs and camcorders. • Power source for battery-powered equipment.
Page Summary Contents For RICOH R1121N SERIES Owner's Manual User Guide
Manual Details
| Brand | Ricoh |
|---|---|
| Pages | 18 |
| File Size | 274.76 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
What are the typical supply current and standby modes?
Typical Supply Current is 35μA, and the Standby Mode current is typically 0.1μA.
Can this regulator be used for battery-powered equipment?
Yes, it is suitable for use as a power source for battery-powered equipment.
What are the design voltage constraints for operation?
The absolute maximum ratings require VIN to stay within 9.0V and the operating temperature range is -40°C to 85°C.
How does the chip enable function work?
It features a built-in chip enable circuit with two types: active 'L' or active 'H'.